Hioki RM3542-50, Instruction Manual

Page: 226 / 234

Appendix 9 Zero Adjustment
A
20
If zero adjustment is difficult when using self-made probe to measure
When you perform zero adjustment using a self-made probe to do the measurement, connect
the tip of the self-made probe as shown in Table 1 (a). However, if connection as shown in
Table 1 (a) is difficult, you can try the following methods.
If DC resistance meter is used
The main purpose of performing zero adjustment is to remove offset of the measurement
instrument. For this reason, the value to be deducted as a result of zero adjustment almost
does not depend on the probe. Therefore, after using the standard probe to make the connec-
tion shown in Table 1 (a) and performing zero adjustment, you can replace it with a self-made
probe to measure with the offset removed from the measurement instrument.
If AC resistance meter is used
In addition to removing offset of the measurement instrument, another main purpose of per-
forming zero adjustment is to remove influence of the probe shape. For this reason, when
performing zero adjustment, try as much as possible to position and set the form of the self-
made probe close to the measurement state. Then, you need to make the connection as
shown in Table 1 (a) and perform zero adjustment.
However, when a Hioki product is used, even in the AC resistance measurement, if the
required resolution exceeds 100
μ
Ω , the same zero adjustment method used with the DC
resistance meter may be sufficient.