9
7. Measuring DC current: DC µA and DC mA ( µA and mA
) (see Fig. 2-7)
This functional mode is used to measure the DC current of a power circuit or other.
Warning: Be sure to measure current in series with the load. An attempt to measure current
in parallel with the load is dangerous as large current would flow through the
PC20TK.
If a current range is connected, its internal resistance may cause a smaller current value than
the actual one to be displayed.
Turn the safety cover counterclockwise and use the µA & mA measurement connector (with a
0.5 A/250 V fuse).
(1) Set the function switch to 400-4000 µA or 40-400 mA.
(2) Press the Select switch to display
on the left part of the readout.
(3) Connect the test pins to the object under measurement and then read the value displayed.
8. Measuring AC current: AC µA and AC mA ( µA
and mA
) (see Fig. 2-8)
This functional mode is used to measure sinusoidal AC current in a small transformer circuit or
other.
Warning: Be sure to measure current in series with the load. An attempt to measure current
in parallel with the load is dangerous as large current would flow through.
An error occurs if any current with non-sinusoidal waves is measured.
The accuracy is warranted within the frequency range of 40-400 Hz.
Turn the safety cover counterclockwise and use the µA & mA measurement connector (with a
0.5 A/250 V fuse).
(1) Set the function switch to 400-4000 µA or 40-400 mA.
(2) Press the Select switch to display
on the left part of the readout.
(3) Connect the test pins to the object under measurement and then read the value displayed.
Fig. 2-7: Measuring DC current (DC µA-mA)
Fig. 2-8: Measuring AC current (AC µA-mA)
Battery
Load
Transformer
Resistor
100Ω
1
1
2
2
3
3
COM
COM
µA & mA
µA & mA
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