Palm Size Digital Multimeter
Model: 72-7765A / 72-10420A / 72-7770A
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IMPORTANT SAFETY INFORMATION
Please read these instructions carefully before use and retain for future reference.
•Check the test leads, probes and case insulation before using. If you find any breakage or abnormality, or you consider the device is broken, stop using the device immediately.
•When using the test probes, keep your fingers behind the finger protection ring.
•Do not use the meter with the back cover open.
•Select the appropriate test range for measurements.
•Ensure all inputs are less than the range selected otherwise it may cause electrical shock or meter damage.
•Do not change the range selector position during measurements.
•Do not apply a voltage over 250V between COM terminal and ground.
•Take caution when working voltages are above 60V DC or 30V AC rms.
•Do not connect the meter to voltage signals when the range selector is on current, resistance, diode or continuity range.
•When measuring current, each single measurement should be shorter than 10 seconds. For current values over 5A, the wait period between each measurement must be longer than 15 minutes.
•When a measurement has been completed, disconnect the testing probes from the circuit under test.
•Replace the batteries as soon as the low battery indicator appears on the display.
•Remove dead batteries from the meter or if it is not going to be used for a long time.
•Never mix old and new batteries together, or different types of batteries.
•Never dispose of batteries in a fire, or attempt to recharge ordinary batteries.
•Before replacing the battery, turn off the meter and disconnect all the test probes.
•To prolong battery life turn off the meter after use.
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WHAT’S INCLUDED |
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• Digital palm size Multimeter. |
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Instruction manual. |
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Test leads. |
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ELECTRICAL SYMBOLS |
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AC or DC |
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Low battery |
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AC |
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Diode |
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DC |
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Fuse |
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Ground |
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Continuity sounder |
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Double insulation |
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FUNCTIONS
Meter front panel (Figure 1)
1.LCD display
2.SELECT button(72-7765A)(Press the yellow button to switch between AC and DC current, or between continuity and diode measurements, indicated by buzzer. In standby mode, press it to activate the meter and cancel auto power off function.) Or HOLD button (72-10420A/72-7770A) (Press the yellow button, then the current displayed data will be held with letter H shown on LCD. Press it again to exit data hold operation.
3.Backlight display button
4.Range selector
5.COM input terminal
6.10A input terminal
7.Other input terminal
OPERATING PARAMETERS
•Operating temperature: 23ºC ± 5ºC.
•Relative humidity: <75%.
DC VOLTAGE
Model |
Range |
Resolution |
Accuracy |
Overload Protection |
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400mV |
0.1mV |
± (0.8%+3) |
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72-7765A |
4V |
1mV |
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250V AC |
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40V |
10mV |
± (0.8%+1) |
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250V |
100mV |
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200mV |
100μV |
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72-10420A |
2000mV |
1mV |
± (0.5%+2) |
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250V DC and AC |
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20V |
10mV |
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72-7770A |
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200V |
100mV |
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250V |
1V |
± (0.8%+2) |
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Note:
•Input impedance is 10MΩ.
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AC VOLTAGE
Model |
Range |
Resolution |
Accuracy |
Overload Protection |
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4V |
1mV |
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72-7765A |
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± (1.2%+3) |
250VAC |
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40V |
10mV |
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250V |
100mV |
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72-10420A |
200V |
100mV |
± (1.2%+10) |
250V DC and AC |
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72-7770A |
250V |
1V |
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Notes:
•Input impedance: ~ 5MΩ.
•Displaying effective value of sine wave (mean value response).
•Frequency response: 40 ~ 400Hz.
DC CURRENT
Model |
Range |
Resolution |
Accuracy |
Overload Protection |
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400μA |
0.1μA |
± (1%+2) |
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4000μA |
1μA |
400mA/250V fast type |
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72-7765A |
40mA |
10μA |
± (1.2%+2) |
fuse Φ5x20mm |
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400mA |
100μA |
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4A |
1mA |
± (1.5%+5) |
10A/600V fast type fuse |
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10A |
10mA |
Φ6x25mm |
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2000μA |
0.1μA |
± (0.5%+2) |
200mA, 250V fast type |
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72-10420A |
20mA |
1μA |
fuse Φ5x20mm |
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72-7770A |
200mA |
100μA |
± (1.2%+2) |
10A, 600V fast type |
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10A |
10mA |
± (2%+5) |
fuse Φ6x25mm |
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Note:
•At 10A range: every measurement should be <10s, the interval between measurements must be > 15 minutes.
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