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6.1.1 Current terminal internal connection
This method is suitable for low-power testing, that is, the test current is relatively small. It is
recommended to use it to make the current test more accurate, and the voltage measurement
will cause small errors due to the voltage drop caused by the current on the ammeter
(This error can be ignored). The wiring method and brief principle are shown in Figure 6-1:
(Figure 6-1 Ammeter connection method-suitable for small current connection method)
6.1.2 External current terminal
This method is suitable for high-power load testing, that is, the test current is relatively large. It is
recommended to make the voltage test more accurate, and the current measurement will cause
a small error due to the shunting of the voltmeter (this error can be ignored). The wiring method
and brief principle are shown in Figure 6-2:
(Figure 6-2 Ammeter external method-suitable for high current connection method)
Recommended process for connecting test lines:
1) Connect the positive and negative ends of the current in series with the load (connected into a
loop, the negative end of the current is connected to the neutral line);
2) Connect the positive and negative voltage ends to the load or the input source according to
the requirements (that is, the positive voltage end is connected to the live wire, and the negative
voltage end is connected to the current positive end or current negative end);
3) Confirm again that the live wire of the input source is connected to the positive terminal of the
voltage, and the neutral wire of the input source is connected to the negative terminal of the
current.
