Moreland A830L Digital LCD Display Multimeter Portable Meter

Overview

The multimeters A830L&A830C are characterized at slim size, portable, stable performance and anti-dropping capacity. Using 3½ digits LCD monitor with characters 15MM high, they offer clear readings. With overall circuilry design centering on large-scale IC A/D converters in conjunction and overload protection circuit, the meters give excellent performance and exquisite making as a handy utility instrument. The meters can be used te measure DC & AC voltage. DC current, resistance, temperature (only HM~838L), positive diode voltage fall, hFE parameters for transistor and Continuity.

Panel Layout

1. LCD Display: 3½ digits, character 15MM high
2. Back Light Button Switch: Press this button to switch on back light If the button to switch on back light If the dark circumstance light makes the reading difficult when measuring, the light will be automatically turned off in 5 seconds. Press again to switch it on again. If the battery is in weak power, the light will be dimmed.
3. Triode amplifier
4. Rotary Switch: use this switch to select functions and ranges
5. V mA Inpul Jack
6. COM Input Jack
7. 10A InputJack

Safely Information

1. The meters are designed according to IEC-1010 concerning electronic measuring instruments with an over-voltage category (CAT Il) and pollution 2.
2. Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good operating condition.
3. Safety symbols:
   • Important safety information: refer to the operating manual.
   • Dangerous voltage may be present.
   • Double insulation (protection Class)

Special Cautions for Operation

1. The meters can be safe only according to standard procedures when used in conjunction with the supplied test leads. To replace damaged test leads with only the same model or the same electrical specifications.
2. To avoid the risk of electric shock, do not use the meters before the cover is in place.
3. The range switch should be at the right position for the testing.
4. To avoid electric shock and damaging the instruments, the input signals are forbidden to exceed he specified limits.
5. When measuring a TV set or switched power, attention should be paid to the possible pulses that may cause destruction to the circuit.
6. The range switch position is forbidden to be changed at random during measurement.
7. Take caution against. shock in the course ot measuring voltage higher than DC 60V & AC 30V.
8. The protection fuse should be replaced only with the same type and specification.

GENERAL SPECIFICATIONS

1. Max Voltage between input terminal and Earth Ground: CAT II 600V
2. Over-mnage Indication: display “” for the significant digit.
3. Automatic display of negative polarity”-“
4. Low Battery Indication: displayed
5. Max LCD display: 1999 (31/2 digits)
6. Fuse protection: F-200mA/250V(05x20MM)
7. Power Supply: 9V battery, 6F22 or NEDA 1604
8. Operating Temp.: 0°C to 40°C (relative humidity <85%)
9. Storage Temp.:-10°C to 50°C ((relative humidity <85%)
10. Guaranteed precision Temp.:23 $ 5 °C (relative humidity <85%)
11. Dimension: 69x138x31MM (with holster)
12. Weight: approx. 170g (including battery)

Testing Specifications

Accuracy is specified for a period of year after calibration and at 18°C to 28 °C (64 F to 82’F ) with relative humidity to 75%.

1. DC Voltage
2. AC Voltage
3. DC Current
4. Resistance
5. Transistor hFE Test
6. Diode Test
7. Continuity
   – overload protection: 250V effective value
   – open circuit vollage: approximately 3.OV
8. Batty Test

OPERATING INSTRUCTIONS

Attention before operation

1. 1 Check 7V banery. if the battery voltage is less than 7V, display will show”“, the battery should be replaced at this time to ensure measuring precision.
2. Pay attention to he “ “besides the input iack which shows that the input voltage or curren!should be within(he specified value.
3. The range switch should be positioned to desired range for measurement before operation.

Measuring DC Voltage

1. Connect the black test lead to COM jack and the red to V 2 mA jack.
2. Set the rotary switch at the desired V range position.
3. Connect testleads across the source or load undel measurement.
4. You can get reading from LCD. The polarity of the red lead connection will be indicated along with the voltage value.

NOTE:

1. When the value scale to be measured is unknown beforehand, setthe range selector at the highest position.
2. When only the figure’ or ‘ -1’ is displayed, it indicates an over-range situation and he higher range has to be selected.
3. “” means you can,’ input the voltage more than 600V, it’s possible to show higher voltage, but it may destroy the inner circuit orpose a shock.
4. Be cautious against shock when measuring high Voltage.

Measuring AC Voltage

1. Connect the black test lead to the COM jack and the red to ve mA jack.
2. Set the rotary switch at the desired V= range position.
3. Connect test leads across the source or load under measurement.
4. You can get reading From LCD.

NOTE:

1. When the value scale to be measured is unknown beforehand, set the range selector at the highest position.
2. When only lhe figure’ 1’or ‘ -1’ is displayed, it indicates an over-range situation and the higher range has to be selected.
3. “” means you can. Input the voltage more than 600V, it’s possible to show higher voltage, bul it may destroy the inner circuit or pose a shock.
4. Be cautious against shock when measuring high voltage.

Measuring DC Current

1. Connect the black test lead to COM jack and the red to the V s mA jack for a maximum 200mA current, for a maximum 10A current, move Ihe red lead to the 10A jack.
2. Set the rotary switch at the desired A range position.
3. Connect test leads in series with the load under measurement.
4. You can get reading from LCD. The polarity of the red iead connection will be indicated along with the current value.

NOTE

1. When the value scale to be measured is unknown beforehand, select the range selector at the highest position.
2. When only the figure’ P’ Or L’ is displayed, it indicates an over-range situation and the higher range has to be selected.
3. “” means the socket mA’s maximum current is 200mA, and 10A’s maximum current is 10A; overcurrent will destroy the fuse. Since 10 A is not fused, the measuring time should be less than 1 second to prevent precision from being affected by circuit heating.

Measuring Resistance

1. Connect the black test lead to the COM jack and the red to V mA jack.
2. Set the rotary switch at the desired range position.
3. Connect test leads across the resistance under measurement.
4. You can get reading from the LCD.

NOTE:

1. When only ihe figure’1′ or -1′ is displayed, it indicates an over-range situation and the higher range has to be selected.
2. For measuring resistance above 1M, the meter may take a few seconds to get a stable reading.
3. When the input is not connected, i.e. At open circuit, the figure ‘1’ will be displayed for the over-range condition.
4. When checking in-circuit resistance, be sure the circuit under test has all power removed and that all capacitors have been discharged fully.
5. The value scale to be measured is unknown beforehand,set the tile range selection at the highest position.

Measuring Temperature

1. Set the rotary switch at the °C range position.
2. The LCD will sow the current temperature of the environment.
3. When measuring temperature with a thermocouple, the temperature probe for this meter can be used. Insen.K. Type thermocouple probe(red one into V mA jack and black one into COM jack)
4. You can get a reading from the LCD.

Transistor Testing

1. Set the rotary switch at, hFE, position.
2. Determine whether the transistor under testing is NPN or PNP and locate the emitter, base and collector leads. Insert the leads into the proper holes of the hFE socket on the front panel.
3. Read the approximate hFE value at lhe testing condition of base current Ib 10uA and Vce 3V.

Diode Testing

1. Connect the black test lead to COM jack and the red to V mA jack. (the polarity of red lead is’+’)
2. Set the rotary switch at athe range position.
3. Connect the red lead to the anode and Ihe black lead to the cathode of the diode under testing.
4. You can get a reading from LCD.

NOTE:

1. The meter will show the approximate forward voltage drop of the diode.
2. If the lead connections is reversed, only’1′ will be displayed.

Continuity Testing

1. Connect the black. les lead to COM jack and the red to V mA jack.
2. Set the rotary switch at the range position.
3. Connect test leads across two points of the circuit under testing.
4. If continuity exists(l.e. resistance less than about 50 & ), the built-in buzzer will sound.

NOTE:
If the input open circuit, the figure ‘1’ will be displayed.

Maintenance

1. Before attempting to remove the battery door or open the case, be sure that test leads have been disconnected from the measurement circuit top avoid an electric shock hazard.
2. To avoid electrical shock, remove test leads from measurement circuits before replacing the fuse. For protection against fire. Replace fuses only with specified ratings: F-200mA/250V fuse.
3. You must replace the test leads if the lead is exposed, and should adopt the leads with the same specifications as the original.
4. Use only mois| fabric or sinall amount of detergent, but not a chemical solution, for cleaning.
5. do not use the meter before the back cover is properly closed and the screw is secured. Upon any abnormality, stop the operation immediately and send the meter for maintenance.

Accessories

1. Test Leads: electric rating 1000V 10A
2. Bauery: 9V, 6F22 or NEDA I 604
3. Fuse: F-200mA/250V
4. ‘K’ type Thermocouple(only A930C)
5. Operators Manual

Documents / Resources

Moreland A830L Digital LCD Display Multimeter Portable Meter [pdf] Instruction Manual A830L, A830C, A830L Digital LCD Display Multimeter Portable Meter, A830L, Digital LCD Display Multimeter Portable Meter, Display Multimeter Portable Meter, Multimeter Portable Meter, Portable Meter

References

• User Manual