Three-terminal resistance measurement with lead null (DET4TD2,
DET4TR2, DET4TC2 and DET4TCR2)
In certain circumstances, the resistance of the test lead connecting to the electrode under test may itself
form a significant part of the measurement electrode resistance. This effect can be eliminated using the
lead-null technique described in this section.
1. Ensure the rotary selector switch is in the OFF position.
2. Connect the instrument as shown in Figure 25.
Figure 25: instrument connection for measuring three-terminal resistance
with lead-null
3. Set the rotary selector switch to the 4P position.
4. Select the desired test voltage using the 25 V/50 V button.
5. DET4TC2 and DET4TCR2 only: Select the desired test frequency using the Hz button.
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