KAIWEETS HT208D True-RMS Digital Clamp Meter

Introduction

Thank you for selecting the KAIWEETS HT208D Digital Clamp Meter. This is a True RMS 1000A AC/DC Clamp Meter featuring integrated VFD Mode and Inrush Current capture.

Safety Information

Warnings: Read First

To avoid possible electric shock or personal injury, please obey the following instructions:

• Use the Meter only as specified in this manual, otherwise the protection provided by the Meter might be impaired.
• Avoid working alone; ensure assistance can be rendered.
• Never measure AC current while the test leads are inserted into the input jacks.
• Do not use the Meter in wet or dirty environments.
• Inspect the test leads before use. Do not use them if insulation is damaged or metal is exposed.
• Check the test leads for continuity. Replace damaged test leads before using.
• Use extreme caution when working around bare conductors or bus bars. Contact with the conductor could result in electric shock.
• Do not hold the Meter beyond the tactile barrier.
• Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth ground.
• Remove test leads from the Meter before opening the Meter case.
• Never operate the Meter with the back cover removed or the case open.
• Never remove the back cover or open the case of an instrument without first removing the test leads or the jaws from a live conductor.
• Use caution when working with voltages above 30 V ac RMS, 42 V ac peak, or 60 V dc, as these voltages pose a shock hazard.
• Do not attempt to measure any voltage that might exceed the maximum range of the Meter (1000 V RMS).
• Do not operate the Meter around explosive gas, vapor, or dust.
• When using probes, keep fingers behind the finger guards.
• When making electrical connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead.
• Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, or diodes.
• Check the operation of the meter at a known source before and after use.

Product Overview

1. NCV Probe

2. Current Sensing Jaw

3. Flashlight

4. Tactile Barrier

5. Rotary Function Switch

6. Function Buttons

7. Display

8. Alignment Marks

9. Jaw Release

10. INPUT Terminal (red test lead)

11. COM Terminal (black test lead)

12. Data Hold / Flashlight Switch

Symbol Explanation

Function Buttons

• FUNC.: Press the "FUNC." key to switch the respective secondary function between different measurements accessible via the function switch, such as between AC and DC.
• RAN: Auto-Ranging by default. Switches to manual mode and cycles through all ranges. Auto-Ranging is restored when pressed for two seconds.
• MAX MIN: Press this key to switch between the maximum and minimum values; press this key for more than 2 seconds to exit this mode. Before entering the "MAX/MIN" mode, press the range key to switch to the most suitable range. After entering this mode, the meter will automatically enter manual range mode.

NOTE: In DC current measurement mode, this key is the "ZERO" key. In other functions, this key is the "REL" key.

"REL" Function: Relative (REL) mode stores the existing reading (a delta) and resets the display to zero. It sets a relative reference point to measure against the next reading.

"ZERO" Function: This function allows the user to set the magnetization effects to zero when measuring DC. It must be performed after each high amplitude current measurement. With no conductor inserted into the clamp, press and hold this key (approx. 3 seconds) until a beep sounds and the "ZERO" symbol appears on the display.

HOLD: Captures and holds a stable measurement. Make sure that the function is deactivated at the start of the test, otherwise an incorrect measurement result will be simulated!

Work Light: Press and hold this button for more than 2 seconds to switch the work light on or off.

Advanced Functions

AC Current Measurement with "Inrush" Function

Inrush current is the instantaneous high input current drawn by a power supply or electrical equipment at turn-on, due to the high initial currents required to charge capacitors, inductors, or transformers.

1. With the device to be tested turned off, turn the meter's dial to the proper range (60/600A).
2. Center the jaw around the device's live wire.
3. Press the FUNC button 3 times until the “INRUSH” symbol is displayed.
4. Switch on the device. The inrush current (spike) is displayed on the meter's display.

Note: The measuring time of inrush current is about 100ms.

AC Current Measurement with "VFD" Function (Variable Frequency Drive Filtering)

The VFD mode eliminates high-frequency noise in voltage measurements using a low-pass filter. It is designed for variable frequency drive (VFD) measurements and is always active for AC measurements.

Turn the knob and select the proper range (60 / 600A or 1000A), then press the FUNC key until the "VFD" symbol is displayed.

Note: Please do not use VFD function to verify the presence of dangerous voltage or current, which may exceed the indicated value.

AC Voltage Measurement with "VFD" Function

Turn the knob to VFD≃V or LoZ≃V, then press the FUNC key until the "VFD" symbol is displayed.

Note: Please do not use VFD function to verify the presence of dangerous voltage or current, which may exceed the indicated value.

High-Impedance Voltage Measurement

High Impedance refers to high electrical impedance. This is used to denote the input or output impedance of electrical circuits and devices. When measuring in the circuit, this has only a minor impact on the circuit's performance, particularly for sensitive electronic or control circuits.

Low-Impedance Voltage Measurement (LoZ≃V)

LoZ≃V mode allows you to measure AC/DC voltages with a low impedance. In this mode, the Meter lowers the internal resistance to prevent 'phantom' voltage readings. As a result, the circuit is more heavily loaded than in the standard measuring mode.

Attention:

• When using LoZ≃V (low input impedance) measurement, the continuous measurement time cannot exceed 1 minute.
• Do not use LoZ mode to measure the voltage in a circuit that may be damaged due to the low impedance of this mode.

Operating Instructions

Insert and Replace the Batteries

Replace the batteries immediately when the symbol □ appears in the display. Disconnect the meter from the power source. Remove the test leads from the measuring device, loosen the screws on the back, remove the lower half of the housing, replace the old batteries, and screw the cover back on.

Turn On/Off the Meter

The device is switched on when the rotary switch (5) is set to a measuring function. When the rotary switch is set to OFF, the measuring device is switched off.

Automatic Shutdown

If there is no operation for 15 minutes, the clamp meter beeps 3 times. Without further operation, the clamp meter beeps again and switches off automatically. Press any key to restore the clamp meter to operating status. The symbol ◼ appears on the display. To deactivate the automatic switch-off, hold down the "FUNC." key for more than 2 seconds and switch on the clamp meter simultaneously. The symbol ◼ disappears. Restarting after switching off the meter restores the automatic switch-off.

Auto-ranging

The meter automatically selects the measuring range best suited for the measurement performed. The measuring unit and resolution are adjusted simultaneously.

AC Zero Input Behavior of True-RMS Meters

Unlike averaging meters, which accurately measure only pure sinewaves, True-RMS meters accurately measure distorted waveforms. True-RMS converters require a certain level of input voltage to make a measurement. This is why AC voltage and current ranges are specified from 5% of range to 100% of range. Non-zero digits displayed on a True-RMS meter when the test leads are open or shorted are normal and do not affect the specified AC accuracy above 5% of range.

Connecting Test Leads

Do not test if leads are improperly seated, as results could cause intermittent display readings. To ensure proper connection, firmly press leads into the jack completely.

Making Measurements

AC/DC Current Measurement

• When making current measurements, disconnect the test leads from the Meter.
• Keep fingers behind the Tactile Barrier (4).
• When measuring current, center the conductor in the Jaw using the alignment marks on the Jaw.
• Before taking DC measurements, please press the □ key to ensure correct readings. Zeroing the Meter removes DC offset from the reading. The Zero function works only in DC current measurement.
• Before zeroing the Meter, ensure the Jaws are closed and there is no conductor inside the Jaw.

1. Turn the rotary switch to the correct current setting (60/600A, 1000A). "DC" appears on the display. Press the "FUNC." button; "AC" is shown on the display.
2. If measuring DC current, wait for the display to stabilize and then press □ to zero the Meter.
3. Open the Jaw by pressing the Jaw Release and insert the conductor into the Jaw.
4. Close the Jaw and center the conductor using the alignment marks.
5. View the reading on the display.

Important Notes:

• Do not use the current clamp to surround more than one conductor.
• If the supply and return conductors (e.g., L and N) are measured together, the currents will cancel each other out, and no measurement will be displayed. The cables of household appliances usually contain L and N conductors. A cable separator is required to measure with the current probe.
• If several supply conductors are measured, the currents add up.

AC/DC Voltage Measurement

Warning: Voltage above 750 V (AC) / 1000 V (DC) cannot be measured! When measuring high voltage, pay special attention to safety to avoid electric shock or injury.

1. Set the rotary switch to VFD≃V or LoZ≃V, then press the "FUNC." key to change the AC or DC voltage measurement.
2. Plug the black test lead into the COM socket and the red test lead into the INPUT socket.
3. Bring the test probes into contact with the points to be measured.
4. Read the measurement results on the display.

Attention:

• When using LoZ≃V (low input impedance) measurement, the continuous measurement time cannot exceed 1 minute.
• Do not use LoZ mode to measure the voltage in a circuit that may be damaged due to the low impedance of this mode.

High impedance voltage measurement: 10 MΩ

Low impedance voltage measurement: 300 kΩ

Frequency or Duty Cycle Measurements (Hz%)

1. Turn the rotary function switch to Hz%.
2. Plug the black test lead into the COM socket and the red test lead into the INPUT socket.
3. Connect the probes to the measuring points (connect to the measured power supply or to the parallel connection).
4. Read the result on the display.
• In Hz% mode, Range: 0~10MHz. Voltage sensitivity: 0.5~10V AC (as the frequency increases, the voltage should increase accordingly).
• In V mode, Range: 10Hz~10 kHz. Voltage sensitivity: > 0.5V AC (as the frequency increases, the voltage should increase accordingly).
• In A mode, Range: 10Hz~1 kHz. Current sensitivity: > 20A (as the frequency increases, the current should increase accordingly).

Resistance Measurement Ω

1. Turn the rotary function switch to Ω for resistance measurement. It displays "MΩ" on the screen.
2. Turn off the circuit under test.
3. Plug the black test lead into the COM socket and the red test lead into the INPUT socket.
4. Place the test probes in contact with the points where the resistance must be measured.
5. Read the result on the display.

Note: When measuring resistance on a circuit, the measured value can be influenced by other circuits.

Overload protection: 250V

Continuity Test ◦

1. Turn the rotary switch to Ω and press the "FUNC." key until ◦ appears on the display. The continuity test is now active.
2. Plug the black test lead into the COM socket and the red test lead into the INPUT socket.
3. Connect the probes to the circuit or component under test.
4. If the resistance is <30 Ω, an acoustic signal sounds continuously, and the orange backlight lights up.

Note: When measuring resistance on a circuit, the measured value can be influenced by other circuits.

Test Voltage Approx. 1V

Overload protection: 250V

Diode Test

1. Turn the rotary function switch to Ω, then press the "FUNC." key 2 times until Ω appears on the display.
2. Remove power from the circuit being tested.
3. Connect the black test lead to the COM terminal and the red test lead to the INPUT terminal.
4. Connect the black test lead to the cathode side and the red test lead to the anode side of the diode being tested.
5. Read the forward bias voltage value on the LCD.
6. If the polarity of the test leads is reversed relative to the diode polarity, the LCD reading shows "OL". This can be used to distinguish the anode and cathode sides of a diode.

Warning: To avoid electrical shock when testing diodes in a circuit, ensure the power to the circuit is turned off and all capacitors are discharged. Forward DC current is about 1.5 mA, Reverse DC voltage is about 3V.

Overload protection: 250V

Capacitance Measurement

1. Remove power from the circuit being tested. Turn the rotary function switch to Δхх, then press the "FUNC." key 3 times until "nF" appears on the display.
2. Connect the black test lead to the COM terminal and the red test lead to the INPUT terminal.
3. Connect the probes across the circuit or (capacitance) component to be tested.
4. View the reading on the display.

Warning: To avoid electrical shock when testing capacitance in a circuit, ensure the power to the circuit is turned off and all capacitors are discharged.

When measuring small capacitors, turn on the relative value (REL) to subtract the residual capacitance value of the meter and the conductor when the test probe is open. When measuring a capacitance greater than 100 uF, it will take a long time to measure correctly.

Overload protection: 250 V

Temperature Measurement

1. Turn the rotary function switch to °C / °F position.
2. Insert the K-type thermocouple into the meter, the positive pole (red) of the thermocouple into the INPUT input and the negative pole (black) into the COM input.
3. Contact the thermocouple probe with the measurement object; the readings are then applied to the display.
4. Connect the temperature probe with the testing point.

Warning: To avoid possible electric shock, DO NOT apply the probe tip to any conductor that is greater than 30 V ac, 42 V peak, or 60 V dc to earth.

Note: It takes a long time for the cold end of the thermocouple to be restored in the instrument to achieve thermal balance with the environment.

Non-contact AC Voltage Detection (NCV)

Warning: When using NCV function, please remove the probe, otherwise the detection sensitivity will be affected.

1. Turn the knob to NCV/LIVE; the "Θ[□]" symbol is displayed.
2. Approach the NCV probe gradually to the detected point.
3. When a weak electromagnetic field signal is sensed, the character "-- L" is displayed, the buzzer emits a slow beep sound, and the green LED indicator light turns on.
4. When a strong electromagnetic field signal is sensed, the character "-- H" is displayed, the buzzer emits a quick beep sound, and the red LED indicator light turns on.

Live Detection

Warning: Remove the black test lead; otherwise, the detection sensitivity will be affected.

1. Turn the knob to NCV/LIVE, press the FUNC key until the "L, UF" symbol is displayed.
2. Insert the red test lead into the INPUT terminal.
3. Connect the red test lead to the conductor to be measured.
4. When a weak electromagnetic field signal is sensed, the character "-- L" is displayed, the buzzer emits a slow beep sound, and the green LED indicator light turns on.
5. When a strong electromagnetic field signal is sensed, the character "-- H" is displayed, the buzzer emits a quick beep sound, and the red LED indicator light turns on. In general, this indicates that the tested wire is a live wire.

Specifications

• Display: 6000 counts, True RMS
• Display update frequency: approx. 3 Hz
• Measuring impedance: 10 MΩ (V range)
• Operating voltage: 3 x AAA (1.5V)
• Weight: approx. 700 g
• Dimension: 285 mm x 135 mm x 60 mm
• Security standard: IEC 61010-1, IEC 61010-2-032: CAT III 1000V / CAT IV 600V, IEC 61010-2-033: CAT III 1000V / CAT IV 600V
• Pollution level: 2
• Operating temperature: 0 to +40°C
• Operating humidity: <80%
• Operating height: 0 to max. 2000 m
• Storage temperature: -10 to +60°C
• Air humidity in storage: <70%

Accuracy

Maintenance

Warning:

• To avoid electrical shock, disconnect test leads from the Meter before removing its back cover. Never use the Meter with the back cover removed.
• Repairs or servicing not covered in this manual should be performed only by qualified personnel.

Caution:

• To avoid contamination or static damage, do not touch the circuit board without proper static protection.
• If the Meter is not going to be used for a long time, remove the battery. Do not store the Meter in a high temperature or high humidity environment.

Cleaning the Meter

• To avoid damaging the meter, do not use abrasives or solvents on this instrument.
• Periodically clean the Meter by wiping it with a damp cloth and mild detergent.
• Do not get water inside the case, as this may lead to electrical shock or damage to the instrument.
• Wipe the contacts in the socket with a clean cotton swab soaked in alcohol.

Three Year Warranty

KAIWEETS will repair, without charge, any defects due to faulty materials or workmanship for three years from the date of purchase, provided that:

• Proof of purchase is produced.
• Service/repairs have not been attempted by unauthorized persons.
• The product has been subject to fair wear and tear.
• The product has not been misused.

Defective products will be repaired or replaced, free of charge or at KAIWEETS' discretion, if sent together with proof of purchase to authorized distributors. For further details of warranty coverage and warranty repair information, send an email to support@Kaiweets.com.

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