Tenma 72-7770A, 72-7765A, 72-10420A User Manual
Palm Size Digital Multimeter
Model: 72-7765A / 72-10420A / 72-7770A
1
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 nd any
breakage or abnormality, or you consider the device is broken, stop using the
device immediately.
• When using the test probes, keep your ngers behind the nger 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 re, 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.
WHAT’S INCLUDED
• Digital palm size Multimeter.
• Instruction manual.
• Test leads.
ELECTRICAL SYMBOLS
AC or DC Low battery
AC Diode
DC Fuse
Ground Continuity sounder
Double insulation
2
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
400mV 0.1mV ± (0.8%+3)
4V 1mV
72-7765A
40V 10mV
± (0.8%+1)
250V AC
250V 100mV
200mV 100μV
72-10420A
72-7770A
2000mV 1mV
20V 10mV
± (0.5%+2)
250V DC and AC
200V 100mV
250V 1V ± (0.8%+2)
Note:
• Input impedance is 10MΩ.
3
AC VOLTAGE
Model Range Resolution Accuracy Overload Protection
4V 1mV
72-7765A
40V 10mV
± (1.2%+3) 250VAC
250V 100mV
72-10420A
72-7770A
200V 100mV
± (1.2%+10) 250V DC and AC
250V 1V
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
400μA 0.1μA
± (1%+2)
72-7765A
4000μA 1μA
40mA 10μA
± (1.2%+2)
400mA/250V fast type
fuse Φ5x20mm
400mA 100μA
72-10420A
72-7770A
4A 1mA
± (1.5%+5)
10A 10mA
2000μA 0.1μA
± (0.5%+2)
20mA 1μA
200mA 100μA ± (1.2%+2)
10A 10mA ± (2%+5)
10A/600V fast type fuse
Φ6x25mm
200mA, 250V fast type
fuse Φ5x20mm
10A, 600V fast type
fuse Φ6x25mm
Note:
• At 10A range: every measurement should be <10s, the interval between
measurements must be > 15 minutes.
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