Testboy TB 312, Operating Instructions Manual, Page: 41 / 219

Operation
Testboy
®
TB 312 41
D
E
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T
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C
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IS
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AC current measurement / A~
Set the appropriate range using the selector switch. Connect the black test lead to the
“COM” jack and the red test lead to the mA or 10 A jack. Connect test leads to the test
specimen. Read off measurement result from the display.
You must use the “10 A” jack when measuring currents above
500 mA!
Alternating current
Measuring
range
Resolution
Accuracy
40 Hz
– 1 kHz 1 kHz – 10 kHz 10 kHz – 20 kHz
500 µA 0.01 µA
± 0.75 % of
meas. val.
+ 20 digits ± 1 % of
meas. val.
+ 20 digits ± 1.2 % of
meas. val.
+ 5 digits
5000 µA 0.1 µA
± 0.75 % of
meas. val.
+ 10 digits ± 1 % of
meas. val.
+ 10 digits ± 1.2 % of
meas. val.
+ 5 digits
50 mA 1 µA
± 0.75 % of
meas. val.
+ 20 digits ± 1 % of
meas. val.
+ 20 digits ± 1.2 % of
meas. val.
+ 5 digits
500 mA 10 µA
± 0.75 % of
meas. val.
+ 10 digits ± 1 % of
meas. val.
+ 10 digits ± 1.2 % of
meas. val.
+ 5 digits
5 A 0.1 mA
± 0.75 % of
meas. val.
+ 20 digits ± 1.5 % of
meas. val.
+ 20 digits ± 1.2 % of
meas. val.
+ 5 digits
10 A* 1 mA
± 1 % of
meas. val.
+ 10 digits ± 1.5 % of
meas. val.
+ 10 digits not specified
Accuracy specified only valid for 10 % - 100 % of the measuring range.
- 500 mA range is protected by a F 500 mA / 1000 V fuse.
- 10 A range is protected by a F 10 A / 1000 V fuse.
- in the 10 A range observe the maximum duty cycles!
- Frequency range: 40
– 20000 Hz.
* Following measurement, which should take a
max. 10 seconds, allow the instrument to cool down
for 15 minutes to protect against overheating.
Press the SELECT button to switch between DC, AC and AC+DC measurement
methods.