HT64
User manual

PRECAUTIONS AND SAFETY MEASURES

The instrument has been designed in compliance with directive IEC/EN61010-1 relevant to electronic measuring instruments. For your safety and in order to prevent damaging the instrument, please carefully follow the procedures described in this manual and read all notes preceded by symbol with the utmost attention.
Before and after carrying out measurements, carefully observe the following instructions:

• Do not carry out any measurement in humid environments.
• Do not carry out any measurements in case gas, explosive materials or flammables are present, or in dusty environments.
• Avoid any contact with the circuit being measured if no measurements are being carried out.
• Avoid any contact with exposed metal parts, with unused measuring probes, circuits, etc.
• Do not carry out any measurement in case you find anomalies in the instrument such as deformation, breaks, substance leaks, absence of display on the screen, etc.
• Pay special attention when measuring voltages higher than 20V, since a risk of electrical shock exists.

In this manual, and on the instrument, the following symbols are used:
Warning: observe the instructions given in this manual; improper use could damage the instrument or its components.
Double-insulated meter
AC voltage or current
DC voltage or current
Connection to earth
1.1. PRELIMINARY INSTRUCTIONS

• This instrument has been designed for use in environments of pollution degree 2.
• It can be used for VOLTAGE and CURRENT measurements on installations with CAT IV 600V and CAT III 1000V.
• We recommend following the normal safety rules devised by the procedures for carrying out operations on live systems and using the prescribed PPE to protect the user against dangerous currents and the instrument against incorrect use.
• In case the lack of indication of the presence of voltage may represent a danger for the operator, always carry out a continuity measurement before carrying out the measurement on the live system, in order to confirm the correct connection and condition of the leads.
• Only the leads supplied with the instrument guarantee compliance with the safety standards. They must be in good conditions and be replaced with identical models, when necessary.
• Do not test circuits exceeding the specified voltage limits.
• Do not perform any test under environmental conditions exceeding the limits indicated in § 6.2.1.
• Check that the battery is correctly inserted.
• Make sure that the LCD display and the rotary switch indicate the same function.

1.2. DURING USE
Please carefully read the following recommendations and instructions:
CAUTION
Failure to comply with the caution notes and/or instructions may damage the instrument and/or its components or be a source of danger for the operator.

• Before activating the rotary switch, disconnect the test leads from the circuit being measured.
• When the instrument is connected to the circuit being measured, do not touch any unused terminal.
• Do not measure resistance in case external voltages are present; even if the instrument is protected, an excessive voltage may cause malfunction.
• While measuring, if the value or the sign of the quantity being measured remain unchanged, check if the HOLD function is enabled.

1.3. AFTER USE

• When measurement is complete, set the rotary switch to OFF to switch off the instrument.
• If the instrument is not to be used for a long time, remove the batteries.

1.4. DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard “IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use, Part 1: General requirements”, defines what measurement category, commonly called overvoltage category, is. § 6.7.4: Measured circuits, reads:  (OMISSIS)
Circuits are divided into the following measurement categories:

• Measurement category IV is for measurements performed at the source of the lowvoltage installation. Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units.
• Measurement category III is for measurements performed on installations inside buildings. Examples are measurements on distribution boards, circuit breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial use and some other equipment, for example, stationary motors with permanent connection to fixed installation.
• Measurement category II is for measurements performed on circuits directly connected to the low-voltage installation. Examples are measurements on household appliances, portable tools and similar equipment.
• Measurement category I is for measurements performed on circuits not directly connected to MAINS. Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS-derived circuits. In the latter case, transient stresses are variable; for that reason, the standard requires that the transient withstand capability of the equipment is made known to the user.

GENERAL DESCRIPTION

The instrument carries out the following measurements:

• DC/AC/AC+DC TRMS Voltage
• DC/AC voltage with low impedance (LoZ)
• DC/AC/AC+DC TRMS Current
• DC/AC/AC+DC TRMS Current with transducer clamps
• AC, AC+DC TRMS current
• 4-20mA% display
• Resistance and Continuity test
• Diode test
• Capacity
• Frequency
• Duty Cycle
• Temperature with K-type probe
• Data Logger function and display of graphs of measured data

Each of these functions can be selected by means of the appropriate switch. The instrument is also equipped with function keys (see § 4.2), analogue bargraph and LCD TFT high-contrast color display. The instrument is also equipped with an Auto Power OFF function which automatically switches off the instrument after a certain (programmable) idling time.
2.1. MEASURING AVERAGE VALUES ANDTRMS VALUES
Measuring instruments of alternating quantities are divided into two big families:

• AVERAGE-VALUE meters: instruments measuring the value of the sole wave at fundamental frequency (50 or 60 Hz).
• TRMS (True Root Mean Square) VALUE meters: instruments measuring the TRMS value of the quantity being tested.

With a perfectly sinusoidal wave, the two families of instruments provide identical results.
With distorted waves, instead, the readings shall differ. Average-value meters provide the RMS value of the sole fundamental wave; TRSM meters, instead, provide the RMS value of the whole wave, including harmonics (within the instruments bandwidth). Therefore, by measuring the same quantity with instruments from both families, the values obtained are identical only if the wave is perfectly sinusoidal. In case it is distorted, TRMS meters shall provide higher values than the values read by average-value meters.
2.2. DEFINITION OF TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR
The root mean square value of current is defined as follows: “In a time equal to a period, an alternating current with a root mean square value of 1A intensity, circulating on a resistor, dissipates the same energy that, during the same time, would be dissipated by a direct current with an intensity of 1A”. This definition results in the numeric expression:
The root mean square value is indicated with the acronym RMS.
The Crest Factor is defined as the relationship between the Peak Value of a signal and its
RMS value: CFThis value changes with the signal waveform, for a purely sinusoidal wave it is In case of distortion, the Crest Factor takes higher values as wave distortion increases.

PREPARATION FOR USE

3.1. INITIAL CHECKS
Before shipping, the instrument has been checked from an electric as well as mechanical point of view. All possible precautions have been taken so that the instrument is delivered undamaged. However, we recommend generally checking the instrument in order to detect possible damage suffered during transport. In case anomalies are found, immediately contact the forwarding agent. We also recommend checking that the packaging contains all components indicated in § 6.3.1. In case of discrepancy, please contact the Dealer. In case the instrument should be returned, please follow the instructions given in § 7.
3.2. INSTRUMENT POWER SUPPLY
The instrument is powered by 1×7.4V rechargeable Li-ION battery included in the package. When the battery is flat, the symbol “ ” appears on the display. For battery recharge, please refer to § 6.1.
3.3. STORAGE
In order to guarantee precise measurement, after a long storage time, wait for the instrument to come back to normal condition (see § 7.1.3).

NOMENCLATURE

4.1. DESCRIPTION OF THE INSTRUMENT

CAPTION:

1. LCD display
2. Function key F2
3. Function key F3
4. Function key F1
5. Function key F4
6. RANGE key
7. HOLD/REL key
8. Rotary selector switch
9. Input terminal 10A
10. Input terminal
11. Input terminal mAuA
12. Input terminal COM

4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD/REL key
Pressing the HOLD/REL key freezes the value of the measured quantity on the display. After pressing this key, the message “Hold” appears on the display. Press the HOLD/REL key again to exit the function. To save the vale on the display, see § 4.3.3. Press and hold the HOLD/REL key for a long time in order to activate/deactivate relative measurement. The instrument zeroes the display and saves the displayed value as a reference value which subsequent measurements will be referred to (see § 4.3.4). The symbol “A” appears on the display. This function is not active in position. Press and hold the HOLD/REL key again to exit the function.
4.2.2. RANGE key
Press the RANGE key to activate the manual mode and to disable the Autorange function. The message “Manual” appears on the upper left part of the display instead of “AUTO”. In manual mode, press the RANGE key to change measuring range: the relevant decimal point will change its position. The RANGE key is not active in positions Hz%, . In Autorange mode, the instrument selects the most appropriate ratio for carrying out measurement. If a reading is higher than the maximum measurable value, the indication “O.L” appears on the display. Press and hold the RANGE key for more than 1 second to exit the manual mode and restore the Autorange mode.
4.2.3. Function keys F1, F2, F3, F4
Use keys F1, F2, F3 and F4 to manage the instrument’s internal functions (see § 4.3).
4.2.4. LoZ feature
This mode permits to perform the AC/DC voltage measurement with a low input impedance in way to avoid the wrong readings due to stray voltage in capacitive coupled.
CAUTION
Inserting the instrument between phase and ground conductors, the RCDs protection devices can be tripping out during the test. For phase-PE voltage measurement after a RCD device preliminarily connect the test leads between phase and neutral cables at least for 5s, then perform the phase-PE measurement to avoid unexpected trips-out
4.2.5. LEAD message at display
From instrument switch off (OFF), in the positions a short sound is emitted and a “LEAD” message is shown for a while to indicate an advise of using test leads for the current measurements.
4.3. DESCRIPTION OF INTERNAL FUNCTIONS
4.3.1. Description of the display

CAPTION:

1. Indication of Automatic/Manual mode
2. Indication of the system’s time
3. Indication of battery charge level and activation/deactivation of key tone (not associated with continuity test)
4. Indication of measuring unit
5. Indication of measuring result
6. Analogue bargraph
7. Indications associated with function keys F1, F2, F3, F4

4.3.2. AC+DC Voltage and Current measurement
The instrument is capable of measuring a possible presence of overlapping alternating components on a generic voltage or current direct waveform. This can be useful when measuring typical impulsive signals of non-linear loads (e.g. welding machines, electric ovens, etc.).

1. Select position .
2. Press the F2 key selecting the ““ ” or “ ” modes (see Fig. 3)
3. Follow the instructions shown in § 5.1 or § 5.9

4.3.3. HOLD function and saving

1. Press the HOLD/REL key again to freeze the result. The message “Hold” appears onthe display.
2. Press the F3 key to save the data in the instrument’s memory.
3. Enter the General menu to display the saved result (see § 4.3.7)

4.3.4. Relative measurement

1. Press and hold the HOLD/REL key to enter relative measurement (see Fig. 5 – right  side). The message “REL” and symbol “” appear on the display.
2. Press the F4 key to enter the General menu, save the measured result and display it (see § 4.3.7).

4.3.5. Saving MIN/MAX/AVERAGE and PEAK values

1. Press the F4 key to enter the measuring mode of MAX, MIN and Average values of the quantity to be measured (see Fig. 6 – central part). The message “MAX MIN” appears on the display.
2. The values are automatically updated by the instrument, which emits a short beep whenever the actually displayed values are exceeded (higher for MAX value, lower for MIN value).
3. Press the F2 key to stop detecting the values and the F1 key to start measuring again.
4. Press the F3 key to save the measured result (see Fig. 6 – right side) and display it (see § 4.3.7).
5. Press the F4 key to enter the measuring mode of Peak values of the quantity to be measured (see Fig. 7 – right side). The message “PEAK” appears on the display and the values are updated in the same way as for the MAX/MIN function.
6. Press the F2 key to stop detecting the values and the F1 key to start measuring again.
7. Press the F3 key to save the result and display it (see § 4.3.7).

4.3.6. Creating and saving graphs of measurements

1. Press the F1 key to enter the section for creating a graph of the quantity to be measured (see Fig. 8 – left side).
2. Press the F2 (Fast) or F3 (Slow) key to set the sampling interval the instrument will use as a reference when creating the graph. You can choose among the following values: 0.2s, 0.5s, 1.0s, 2.0s, 5.0s, 10s
3. Press the F1 key to start creating the graph. The measuring range (automatically inserted by the instrument) and the real-time value are displayed by the instrument (see Fig. 8 – central part).
4. Press the F4 key to end the graph.
5. Press the F1 key to save the graph in the instrument’s memory or the F4 key to start a new graph (see Fig. 8 – right side).

4.3.7. Instrument general menu

1. With a measurement on the display (see Fig. 9 – left side), press function key F3 to enter the instrument’s general menu. The screen (see Fig. 9 – right side) is shown on the display.Saving measurements
2. Press the F1 (ENTER) key to save the measurement.
   Recording data (Logger)
3. Use the F2 or F3 key to select symbol “Record” and press the F1 key (see Fig. 10 – left side).
4. Use the F2 or F3 key to select:
   ➢ Setting of recording duration, from 1min to 23h:59min
   ➢ Setting of sampling interval from 1s to 59min:59s
5. Press the F1 key to enable the editing functions and the F2 (+) and F3 (>>) keys to carry out the desired settings.
6. Press the F1 (OK) key to confirm the settings or the F4 (CANCEL) key to go back to editing (see Fig. 10 – right side).
7. Press the key F4 (CLOSE) to go back to the main screen
8. Select the option “Start Recording” and press the F1 key. The following screen appears on the display
9. The instrument shows the remaining time and the number of samples taken in real time, and the message “Stopped” at the end of recording (see Fig. 11 – left side). Press the F4 (STOP) key to stop recording at any time.
10. Press the F2 key to save recorded data in the internal memory and view it again on the display
11. Press the F3 (TREND) key to display the trend of recording (see Fig. 11 – central part).
12. Press the F4 (>>) key to move the cursor on the graph and the F2 (+) key to activate the Zoom function of the graph, increasing resolution (symbol “Xy” where y=max zoom dimension appears at the top of the display on the right side) (see Fig. 11 – right side). You can zoom X1 for at least 15 measuring points, X2 for at least 30 measuring points, X3 for at least 60 measuring points and so on for maximum 6 zooming operations.
13. Press the F4 (BACK) key to go back to the previous screen. Deleting the instrument’s memory
14. Use the F2 or F3 key to select symbol “Delete” and press the F1 key (see Fig. 12 – left side).
15. Use the F2 or F3 key to select the options:
    ➢ Delete all Measurements → all snapshots (measurements) are deleted
    ➢ Delete all Recordings → all recordings are deleted
    ➢ Delete all Graphs → all graphs are deleted.
16. Press the F1 (OK) key to carry out the selected operation (a confirmation message is shown by the instrument). General settings of the instrument
17. Use the F2 or F3 key to select symbol “Setup” and press the F1 key (see Fig. 13 – left side).
18. Use the F2 or F3 key to select the options:
    ➢ Reset → restores the instrument’s default conditions.
    ➢ Format → allows activating the key tone, setting the format of date/time and of the displayed numbers (decimal comma or point).
    ➢ General → allows setting the system’s date/time, defining the Auto Power OFF interval, the background colour and the display’s font colour and type, and choosing the system’s language.
    ➢ Meter Info → provides information on the internal Firmware version and on the memory’s available space.
19. Press the F1 (ENTER) key to carry out the selected operation or the F4 (CANCEL) key to go back to the measuring screen. General settings of the instrument – Reset
20. Press the F1 (OK) key to activate the Reset.
21. The Reset operation do not deletes the instrument’s internal memory
    General settings of the instrument – Format
22. Use the F2 or F3 key to select the options:➢ Key tone → allows activating/deactivating the tone of the function keys.
    ➢ Numeric Format → allows defining the format of the numbers shown on the display among the options: 0.000 (decimal point) and 0,000 (comma)
    ➢ Date Format → allows defining the format of the system date between the options: MM/DD/YY and DD/MM/YY
    ➢ Time Format → allows defining the format of the system time between the options:
23. OURS and 24 HOURS
24. Use the F1 (EDIT) key and the F2 and F3 keys for settings or the F4 key to go back to  the previous screen. General settings of the instrument – Display
25. Use the F2 or F3 key to select the options:
    ➢ Set Date → allows setting the system’s date as defined in the Format menu.
    ➢ Set Time → allows setting the system’s time as defined in the Format menu.
    ➢ Auto Power OFF → allows defining the instrument’s auto power off interval when idling in the range: 5min  60min with resolution 1min. Set value 00 to disable the function. Press the F3 key to switch on the instrument again after it has automatically switched off.
    ➢ Foreground → allows defining the display’s background colour and the colour of the font.
    ➢ Select Font → allows defining the type of font or the display among the available options (0, 1, 2).
    ➢ Language → allows selecting the system’s language among the options: Italian, English, Spanish, German and French
    General settings of the instrument – Instrument Info
26. The instrument shows the following information:
    ➢ Firmware version → internal Firmware version
    ➢ Free memory → percentage values of the remaining free space in the memory for saving snapshots (SAVE), recordings (REC) and graphs (GRAPH).
27. Press the F4 key to go back to the previous screen Recalling graphs to the display
28. Use the F2 or F3 key to select symbol “View G” and press the F1 key (see Fig. 18 – left side).
29. Use the F2 (PREV) or F3 (NEXT) keys to select the desired graph among the ones saved in the instrument’s memory and press key F1 (ENTER) to open the graph (see Fig. 18 – central part).
30. Use the F2 (<<) or F3 (>>) keys to move the cursor within the graph in the two directions, observing the corresponding value at the bottom of the display (see Fig. 18 – right side).
31. Press the F1 (DELETE) key to delete the selected graph or the F4 (BACK) key to go back to the previous screen. Recalling measured data (snapshots) on the display
32. Use the F2 or F3 key to select symbol “View M” and press the F1 key (see Fig. 19 – left side).
33. Use the F2 (PREV) or F3 (NEXT) key to select and view the desired measure among the ones saved in the instrument’s memory (see Fig. 19 – right side). The measure reference appears at the bottom of the display on the right side.
34. Press the F1 (DELETE) key to delete the selected measure or the F4 (CLOSE) key to go back to main screen Recalling recordings to the display
35. Use the F2 or F3 key to select symbol “View R” and press the F1 key (see Fig. 20 – left side).
36. Use the F2 (PREV) or F3 (NEXT) key to select the desired recording among the ones saved in the instrument’s memory (see Fig. 20 – central part). The recording reference appears at the bottom of the display.
37. Press the F1 (TREND) key to display the trend of recording.
38. Press the F3 (>>) key to move the cursor on the graph and observe the corresponding value at the bottom of the display.
39. Press the F2 (+) key to activate (if available) the zooming function of the graph.
40. Press the F1 (DELETE) key to delete the selected recording or the F4 (BACK) key to go back to the previous screen.
    Help on line on the display
41. Use the F2 or F3 key to select symbol “Help” and press the F1 key (see Fig. 21).
42. Use the F2 (UP) or F3 (DOWN) to browse the pages of the context on-line help.
43. Press the F4 (CLOSE) key to go back to the main screen

OPERATING INSTRUCTIONS

5.1. DC, AC+DC VOLTAGE MEASUREMENT
CAUTION
The maximum input DC voltage is 1000V. Do not measure voltages exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Select positions V Hz% or mV
2. Insert the red cable into input terminal and the black cable into input terminal COM.
3. Position the red lead and the black lead respectively in the spots with positive and negative potential of the circuit to be measured (see Fig. 22). The display shows the value of voltage.
4. If the display shows the message “O.L”, select a higher range.
5. When symbol “-” appears on the instrument’s display, it means that voltage has the opposite direction with respect to the connection in Fig. 22.
6. To use the HOLD, RANGE and REL function, see § 4.2.
7. For AC+DC measurement, see § 4.3.2 and to use the internal functions, see § 4.3.

5.2. AC VOLTAGE MEASUREMENT
CAUTION
The maximum input AC voltage is 1000V. Do not measure voltages exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Select positions V Hz% or mV
2. In position mV, press the F2 (MODE) key to view symbol “~” on the display.
3. Insert the red cable into input terminal and the black cable into input terminal COM.
4. Position the red lead and the black lead respectively in the spots of the circuit to be measured (see Fig. 23). The display shows the value of voltage.
5. If the display shows the message “O.L”, select a higher range.
6. Press the F2 (MODE) key to select measurements “Hz” or “%” in order to display the values of frequency and duty cycle of input voltage. Press the F1(TRIG) key to select the positive or negative half-wave of the function “%”The bargraph is not active in these functions.
7. To use the HOLD, RANGE and REL function, see § 4.2.
8. To use the internal functions, see § 4.3

5.3. AC/DC VOLTAGE MEASUREMENT WITH LOW IMPEDANCE (LOZ)
CAUTION
The maximum input AC/DC voltage is 600V. Do not measure voltages exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Select position LoZV. The “LoZ” and “DC” symbols are shown
2. Press the MODE (F2) key to select possibly the “AC” measurement
3. Insert the red cable into input terminal  and the black cable into input terminal COM
4. Position the red lead and the black lead respectively in the desired spots of the circuit to be measured (see Fig. 24) or in the spots with positive and negative potential of the circuit to be measured (see Fig. 22). The display shows the value of voltage.
5. The message “O.L.” indicates that the value of DC voltage exceeds the maximum measurable value.
6. When symbol “-” appears on the instrument’s display, it means that voltage has the opposite direction with respect to the connection in Fig. 22
7. To use the HOLD, RANGE and REL function, see § 4.2
8. To use the internal functions, see § 4.3

5.4. FREQUENCY AND DUTY CYCLE MEASUREMENT
CAUTION
The maximum input AC voltage is 1000V. Do not measure voltages exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Select position Hz%.
2. Press the F2 (MODE) key to select measurements “Hz” or “%” in order to display the values of frequency and duty cycle of input voltage.
3. Insert the red cable into input terminal and the black cable into input terminal COM.
4. Position the red lead and the black lead respectively in the spots of the circuit to be measured (see Fig. 25). The value of frequency (Hz) or of duty cycle (%) is shown on the display. The bargraph is not active in these functions.
5. To use the HOLD and REL function, see § 4.2.
6. To use the internal functions, see § 4.3

5.5. RESISTANCE MEASUREMENT AND CONTINUITY TEST
CAUTION
Before attempting any resistance measurement, cut off power supply from the circuit to be measured and make sure that all capacitors are discharged, if present.

1. Select position
2. Insert the red cable into input terminal and the black cable into input terminal COM.
3. Position the test leads in the desired spots of the circuit to be measured (see Fig. 26). The display shows the value of resistance.
4. If the display shows the message “O.L”, select a higher range.
5. Press the F2 (MODO) key to select measurement )))” relevant to the continuity test, and position the test leads in the desired spots of the circuit to be measured.
6. The value of resistance (which is only indicative) is displayed in 2 and the instrument sounds if the value of resistance is <50Ω
7. To use the HOLD, RANGE and REL function, see § 4.2.
8. To use the internal functions, see § 4.3.

5.6. DIODE TEST
CAUTION
Before attempting any resistance measurement, cut off power supply from the circuit to be measured and make sure that all capacitors are discharged, if present.

1. Select position
2. Press the F2 (MODE) key to select “+” measurement.
3. Insert the red cable into input terminal and the black cable into input terminal COM.
4. Position the leads at the ends of the diode to be tested (see Fig. 27), respecting the indicated polarity. The value of directly polarized threshold voltage is shown on the display.
5. If threshold value is equal to OmV, the P-N junction of the diode is short-circuited.
6. If the display shows the message “O.L”, the terminals of the diode are reversed with respect to the indication given in Fig. 27 or the P-N junction of the diode is damaged.
7. To use the HOLD and REL function, see § 4.2.
8. To use the internal functions, see § 4.3.

5.7. CAPACITANCE MEASUREMENT
CAUTION
Before carrying out capacitance measurements on circuits or capacitors, cut off power supply from the circuit being tested and let all capacitance in it be discharged. When connecting the multimeter and the capacitance to be measured, respect the correct polarity (when required).

1. Select position
2. Press the F2 (MODE) key until the symbol “nF” is displayed.
3. Insert the red cable into input terminal and the black cable into input terminal COM.
4. Press the REL/A key before carrying out measurements.
5. Position the leads at the ends of the capacitor to be tested, respecting, if necessary, the positive (red cable) and negative (black cable) polarity (see Fig. 28). The display shows the value. Depending on the capacitance, the instrument can take about 20s before displaying the correct final value. The bargraph is not active in this function.
6. The message “O.L.” indicates that the value of capacitance exceeds the maximum measurable value.
7. To use the HOLD and REL function, see § 4.2.
8. To use the internal functions, see § 4.3.

5.8. TEMPERATURE MEASUREMENT WITH K-TYPE PROBE
CAUTION
Before attempting any temperature measurement, cut off power supply from the circuit to be measured and make sure that all capacitors are discharged, if present.

1. Select position
2. Press the F2 (MODE) key until the symbol “°C” or “F” is displayed.
3. Insert the provided adapter into input terminals (polarity +) and COM (polarity -) (see Fig. 29)
4. Connect the provided K-type wire probe or the optional K-type thermocouple (see § 7.2.2) to the instrument by means of the adapter, respecting the positive and negative polarity on it. The display shows the value of temperature. The bargraph is not active in this function.
5. The message “O.L.” indicates that the value of temperature exceeds the maximum measurable value.
6. To use the HOLD and REL function, see § 4.2.
7. To use the internal functions, see § 4.3.

5.9. DC, AC+DC CURRENT MEASUREMENT AND E 4-20MA% READING
CAUTION
Maximum input DC current is 10A (input 10A) or 600mA (input mAuA). Do not measure currents exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Cut off power supply from the circuit to be measured.
2. Select position µA, mA or 10A 20mA for 4-20mA reading. to measure DC current or the same position 4-
3. Insert the red cable into input terminal 10A or into input terminal mAµA and the black cable into input terminal COM.
4. Connect the red lead and the black lead in series to the circuit whose current you want to measure, respecting polarity and current direction (see Fig. 30).
5. Supply the circuit to be measured.
6. The value of DC current (see Fig. 30 – left side) appears on the display.
7. The value of reading 4-20mA% (0mA = -25%, 4mA = 0%, 20mA = 100% and 24mA = 125%) (see Fig. 30 right side) appears on the display. The bargraph is not active in this function.
8. If the display shows the message “O.L”, the maximum measurable value has been reached.
9. When symbol “-” appears on the instrument’s display, it means that current has the opposite direction with respect to the connection in Fig. 30.
10. To use the HOLD, RANGE and REL functions, see § 4.2.
11. For AC+DC measurement, see § 4.3.2 and to use the internal functions, see § 4.3

5.10. AC CURRENT MEASUREMENT
CAUTION
Maximum input AC current is 10A (input 10A) or 600mA (input mAuA). Do not measure currents exceeding the limits given in this manual. Exceeding voltage limits could result in electrical shocks to the user and damage to the instrument.

1. Cut off power supply from the circuit to be measured.
2. Select positions μΑ, mA or 10A
3. Press the F2 (MODE) key to select “AC” measurement.
4. Insert the red cable into input terminal 10A or into input terminal mAµA and the black cable into input terminal COM.
5. Connect the red lead and the black lead in series to the circuit whose current you want to measure (see Fig. 31).
6. Supply the circuit to be measured. The display shows the value of current.
7. If the display shows the message “O.L”, the maximum measurable value has been reached.
8. To use the HOLD, RANGE and REL functions, see § 4.2.
9. To use the internal functions, see § 4.3

5.11. DC, AC, AC+DC CURRENT MEASUREMENT WITH TRANSDUCER CLAMPS
CAUTION

• Maximum current measurement in this function is 3000A AC or 1000A DC. Do not measure currents exceeding the limits given in this manual
• The instrument performs the measurement by using both flexible transducer clamp (optional accessory F3000U) and other standard clamp transducers of HT family. For transducer clamps with HT output connector is necessary the NOCANBA optional adapter in order to perform the connection

1. Select position
2. Press F2(MODE) key to select “AC”, “DC” or “AC+DC” measurement
3. Press RANGE key to select on the instrument the same range set on the transducer clamp among the options: 1000mA, 10A, 30A, 40A (only for HT4006) 100A, 300A, 400A (only for HT4006), 1000A, 3000A. The selected range appear in the top left part of the display
4. Insert the red cable into input terminal and the black cable into input terminal COM. For other standard transducers (see §) with HT connector use the NOCANBA optional accessory. For information about the use of transducer clamps refer to relative user manual
5. Insert the cable inside the jaw (see Fig. 32). The value of current appears on the display
6. If the display shows the message “O.L”, the maximum measurable value has been reached
7. To use the HOLD, RANGE and REL functions, see § 4.2
8. To use the internal functions, see § 4.3

MAINTENANCE

CAUTION

• Only expert and trained technicians should perform maintenance operations. Before carrying out maintenance operations, disconnect all cables from the input terminals.
• Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight.
• Always switch off the instrument after use. In case the instrument is not to be used for a long time, remove the battery to avoid liquid leaks that could damage the instrument’s internal circuits.

6.1. RECHARGING THE INTERNAL BATTERY
When the LCD displays symbol “ ”, it is necessary to recharge the internal battery.

1. Position the rotary switch to OFF and remove the cables from the input terminals.
2. Insert the adaptor of the battery charger power supply into the instrument, into the four input terminals (see Fig. 33).
3. Insert the connector of the power supply into the adapter and connect the power supply to the electric mains.
4. A blinking symbol of a green battery appears on the display. The recharging process is complete when the symbol is steady.
5. Disconnect the battery charger from the instrument when the operation is complete.
   CAUTION
   If the charging process does not run, check the integrity of the F800mA/1000V protection fuse (see § 7.1.2) and replace it if necessary (see § 6.2)

6.2. REPLACEMENT OF INTERNAL FUSES

1. Position the rotary switch to OFF and remove the cables from the input terminals.
2. Turn the fastening screw of the battery compartment cover from position and remove it (see Fig. 34) to position
3. Remove the damaged fuse and insert a new fuse of the same type (see § 7.1.2).
4. Restore the battery compartment cover into place and turn the fastening screw from position to position .

6.3. CLEANING THE INSTRUMENT
Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc.
6.4. END OF LIFE
WARNING: the symbol on the instrument indicates that the appliance and its accessories must be collected separately and correctly disposed of.

TECHNICAL SPECIFICATIONS

7.1. TECHNICAL CHARACTERISTICS
Accuracy calculated as [%reading + (num. digits*resolution)] at 18°C  28°C <75%HR
DC Voltage

Range	Resolution	Accuracy	Input impedance	Protection against overcharge
600.0mV	0.1mV	±(0.1%reading + 5digits)	>10MW	1000VDC/ACrms
6.000V	0.001V
60.00V	0.01V
600.0V	0.1V	±(0.2%reading + 5digits)
1000V	1V

AC TRMS Voltage

Range	Resolution	Accuracy (*)		Protection against overcharge
		(50Hz¸60Hz)	(61Hz¸1kHz)
600.0mV	0.1mV	±(0.9%reading + 5digits)	±(3.0%reading + 5dgt)	1000VDC/ACrms
6.000V	0.001V
60.00V	0.01V
600.0V	0.1V
1000V	1V

(*) Accuracy specified from 10% to 100% of the measuring range, Input impedance: > 9M ;
Accuracy PEAK function: ±(10%rdg + 30dgt), PEAK response time: 1ms
For not sinusoidal waveforms the accuracy is: (10.0%reading + 10dgt)
AC+ DC TRMS Voltage

Range	Resolution	Accuracy (*) (50Hz¸1kHz)	Input impedance	Protection against overcharge
6.000V	0.001V	±(3.0%reading + 20dgt)	>10MW	1000VDC/ACrms
60.00V	0.01V
600.0V	0.1V
1000V	1V

(*) Accuracy specified from 10% to 100% of the measuring range
For not sinusoidal waveforms the accuracy is: (10.0%reading + 10dgt)
DC/AC TRMS Voltage with low impedance (LoZ)

Range	Resolution	Accuracy (*) (50Hz¸1kHz)	Input impedance	Protection against overcharge
6.000V	0.001V	±(3.0%reading+40dgt)	approx 3kW	600VDC/ACrms
60.00V	0.01V
600.0V	0.1V
600V	1V

(*) Accuracy specified from 10% to 100% of the measuring range
For not sinusoidal waveforms the accuracy is: (10.0%reading + 10dgt)
DC Current

Range	Resolution	Accuracy	Protection against overcharge
600.0mA	0.1mA	±(0.9%reading + 5digits)	Quick fuse 800mA/1000V
6000mA	1mA
60.00mA	0.01mA
600.0mA	0.1mA	±(0.9%reading + 8digits)
10.00A	0.01A	±(1.5%reading + 8digits)	Quick fuse 10A/1000V

AC TRMS Current

Range	Resolution	Accuracy (*) (50Hz¸1kHz)	Protection against overcharge
600.0mA	0.1mA	±(1.2%reading + 5digits)	Quick fuse 800mA/1000V
6000mA	1mA
60.00mA	0.01mA
600.0mA	0.1mA
10.00A	0.01A	±(1.5%reading + 5digits)	Quick fuse 10A/1000V

(*) Accuracy specified from 5% to 100% of the measuring range; For not sinusoidal waveforms accuracy is: +(10.0%reading + 10dgt)
Accuracy PEAK function: ±(10%rdg+30dgt) , AC+DC TRMS Current: accuracy (50Hz+1kHz): +(3.0%reading + 20dgt)
DC Current with transducer clamp

Range	Output ratio	Resolution	Accuracy (*)	Protection against overcharge
1000mA	1V/1A	1mA	±(1.5%rdg+ 6dgt)	1000VDC/ACrms
10A	100mV/1A	0.01A
30A
40A (**)	10mV/1A		±(1.5%rdg.+26dgt) (***)
100A		0.1A	±(1.5%rdg+ 6dgt)
300A
400A (**)	1mV/1A		±(1.5%rdg.+26dgt) (***)
1000A	1mV/1A	1A	±(1.5%rdg+6dgt)
3000A

(*) Accuracy referred to only instrument without transducer ; (**) With HT4006 transducer clamp ; (***) Accuracy instrument + clamp
AC TRMS Current with transducer clamp

Range	Output ratio	Resolution	Accuracy (*) (50Hz¸1kHz)	Protection against overcharge
1000mA	1V/1A	1mA	±(2.5%rdg + 10dgt)	1000VDC/ACrms
10A	100mV/1A	0.01A
30A
40A (**)	10mV/1A		±(3.5%rdg.+30dgt) (***)
100A		0.1A	±(2.5%rdg + 10dgt)
300A
400A (**)	1mV/1A		±(3.5%rdg+30dgt) (***)
1000A		1A	±(2.5%rdg + 10dgt)
3000A

(*) Accuracy referred to only instrument without transducer ; Accuracy specified from 5% to 100% of the measuring range;
(**) With HT4006 transducer clamp ; (***) Accuracy instrument + clamp
For not sinusoidal waveforms accuracy is: (10.0%reading + 10dgt)
Accuracy PEAK function: ±(10%rdg+30dgt) , AC+DC TRMS Current: accuracy (50Hz1kHz): (3.0%reading + 20dgt)
4-20mA% reading

Range	Resolution	Accuracy	Correspondence
-25%¸125%	0.1%	±50dgt	0mA=-25%, 4mA=0%, 20mA=100%, 24mA=125%

Diode test

Function	Test current	Max voltage with open circuit
	<1.5mA	3.2VDC

Frequency (electronic circuits)

Range	Resolution	Accuracy	Protection against overcharge
40.00Hz ¸ 10kHz	0.01Hz ¸ 0.001kHz	±(0.5%reading)	1000VDC/ACrms

Sensitivity: 2Vrms
Frequency (electronic circuits)

Range	Resolution	Accuracy	Protection against overcharge
6.000Hz	0.001Hz	±(0.09%rdg+5digits)	1000VDC/ACrms
60.00Hz	0.01Hz
600.0Hz	0.1Hz
6.000kHz	0.001kHz
60.00kHz	0.01kHz
600.0kHz	0.1kHz
1.000MHz	0.001MHz
10.00MHz	0.01MHz

Sensitivity: >2Vrms (@ 20% +80% duty cycle) and f<100kHz; >5Vrms (@ 20% + 80% duty cycle) and f>100kHz
Resistance and Continuity test

Range	Resolution	Accuracy	Buzzer	Protection against overcharge
600.0W	0.1W	±(0.8%reading + 10dgt)	<50W	1000VDC/ACrms
6.000kW	0.001kW	±(0.8%reading + 5digits)
60.00kW	0.01kW
600.0kW	0.1kW
6.000MW	0.001MW
60.00MW	0.01MW	±(2.5%reading + 10dgt)

Duty Cycle

Range	Resolution	Accuracy
0.1% ¸ 99.9%	0.1%	±(1.2%reading + 2digits)

Pulse frequency range: 40Hz + 10kHz, Pulse amplitude: ±5V (100+s + 100ms)
Capacity

Range	Resolution	Accuracy	Protection against overcharge
60.00nF	0.01nF	±(1.5%reading + 20dgt)	1000VDC/ACrms
600.0nF	0.1nF	±(1.2%reading + 8digits)
6.000mF	0.001mF	±(1.5%reading + 8digits)
60.00mF	0.01mF	±(1.2%reading + 8digits)
600.0mF	0.1mF	±(1.5%reading + 8digits)
6000mF	1mF	±(2.5%reading + 20dgt)

Temperature with K-type probe

Range	Resolution	Accuracy (*)	Protection against overcharge
-40.0°C ÷ 600.0°C	0.1°C	±(1.5%reading + 3°C)	1000VDC/ACrms
600°C ÷ 1350°C	1°C
-40.0°F ÷ 600.0°F	0.1°F	±(1.5%rdg+ 5.4°F)
600°F ÷ 2462°F	1°F

(*) Instrument accuracy without probe ; Specified accuracy with stable environmental temperature at ±1°C
For long-lasting measurements, reading increases by 2°C
7.1.1. Reference standards
Safety: IEC/EN61010-1
EMC: IEC/EN 61326-1
Insulation: double insulation
Pollution level: 2
Overvoltage category: CAT IV 600V, CAT III 1000V
7.1.2. General characteristics
Mechanical characteristics
Size (L x W x H): 175 x 85 x 55mm (7 x 3 x 2in)
Weight (batteries included): 400g (14 ounces)
Mechanical protection: IP40
Power supply
Battery type: 1×7.4V rechargeable Li-ION battery, 1300mAh
Battery charger power supply: 100/240VAC, 50/60Hz, 10VDC, 1A
Low battery indication: symbol “ ” on the display
Battery life: approx. 15 hours
Auto Power OFF: after 5 60min minutes’ idling (may be disabled)
Fuses: F10A/1000V, 10 x 38mm (input 10A)
F800mA/1000V, 6 x 32mm (input mAuA)
Display
Conversion: TRMS
Characteristics: colour TFT, 6000 dots with bargraph
Sampling frequency: 3 times/s
Memory MEASURES → max 2000, GRAPHS → max 50 RECORDINGS → 128 of max 20000 points
7.1.3. Environmental conditions for use
Reference temperature: 18°C 28°C (64°F 82°F)
Operating temperature: 5°C ÷ 40°C (41°F 104°F)
Allowable relative humidity: <80%RH
Storage temperature: -20°C ÷ 60°C (-4°F 140°F)
Storage humidity: <80%RH
Max operating altitude: 2000m (6562ft)
This instrument satisfies the requirements of Low Voltage Directive 2014/35/EU (LVD) and of EMC Directive 2014/30/EU
This instrument satisfies the requirements of European Directive 2011/65/EU (RoHS) and 2012/19/EU (WEEE)
7.2. ACCESSORIES
7.2.1. Accessories provided

• Pair of test leads with 2/4mm tips
• Adapter + K-type wire probe
• Li-ION rechargeable battery Code BAT64
• Battery charger power supply multiplug + interface Code A64
• Carrying bag and user manual

7.2.2. Optional accessories

• K-type probe for air and gas temperature Code TK107
• K-type probe for semisolid substance temperature Code TK108
• K-type probe for liquid substance temperature Code TK109
• K-type probe for surface temperature Code TK110
• K-type probe for surface temperature with 90° tip Code TK111
• Flexible transducer clamp AC 30/300/3000A Cod. F3000U
• Standard transducer clamp DC/AC 40-400A/1V Cod. HT4006
• Standard transducer clamp AC 1-100-1000A/1V Cod. HT96U
• Standard transducer clamp AC 10-100-1000A/1V Cod. HT97U
• Standard transducer clamp DC 1000A/1V Cod. HT98U
• Adapter for standard transducer clamp with HT connector Cod. NOCANBA

ASSISTANCE

8.1. WARRANTY CONDITIONS
This instrument is warranted against any material or manufacturing defect, in compliance with the general sales conditions. During the warranty period, defective parts may be replaced. However, the manufacturer reserves the right to repair or replace the product. Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance. A report will always be enclosed to a shipment, stating the reasons for the product’s return. Only use original packaging for shipment. Any damage due to the use of non-original packaging material will be charged to the Customer. The manufacturer declines any  esponsibility for injury to people or damage to property.
The warranty shall not apply in the following cases:

• Repair and/or replacement of accessories and battery (not covered by warranty).
• Repairs that may become necessary as a consequence of an incorrect use of the instrument or due to its use together with non-compatible appliances.
• Repairs that may become necessary as a consequence of improper packaging.
• Repairs which may become necessary as a consequence of interventions performed by unauthorized personnel.
• Modifications to the instrument performed without the manufacturer’s explicit authorization.
• Use not provided for in the instrument’s specifications or in the instruction manual.

The content of this manual cannot be reproduced in any form without the manufacturer’s authorization.
Our products are patented and our trademarks are registered. The manufacturer reserves the right to make changes in the specifications and prices if this is due to improvements in technology.
8.2. ASSISTANCE
If the instrument does not operate properly, before contacting the After-sales Service, please check the conditions of battery and cables and replace them, if necessary. Should the instrument still operate improperly, check that the product is operated according to the instructions given in this manual. Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance. A report will always be enclosed to a shipment, stating the reasons for the product’s return. Only use original packaging for shipment; any damage due to the use of non-original packaging material will be charged to the Customer.
HT ITALIA SRL
Via della Boaria, 40
48018 – Faenza (RA) – Italy
T +39 0546 621002
F +39 0546 621144
M info@ht-instrumnents.com
www.ht-instruments.it
HT INSTRUMENTS SL
C/ Legalitat, 89
08024 Barcelona – Spain
T +34 93 408 17 77
F +34 93 408 36 30
M info@htinstruments.es
www.ht-instruments.com/es-es/
HT INSTRUMENTS GmbH
Am Waldfriedhof 1b
D-41352 Korschenbroich – Germany
T +49 (0) 2161 564 581
F +49 (0) 2161 564 583
M info@htinstruments.de
www.ht-instruments.de

WHERE WE ARE

https://l.ead.me/bcsxjF
© Copyright HT ITALIA 2024
Release 3.01 – 04/12/2024

Documents / Resources

HT Instruments HT64 TRMS/AC+DC Digital Multimeter With Colour LCD Display [pdf] User Manual HT64, HT64 TRMS AC DC Digital Multimeter With Colour LCD Display, HT64, TRMS AC DC Digital Multimeter With Colour LCD Display, Digital Multimeter With Colour LCD Display, Multimeter With Colour LCD Display, Colour LCD Display, LCD Display, Display

References

• User Manual