Hioki Super megohm SM7110 - Connecting Objects to be Measured and the Switching Unit to the Instrument

Appx.9
Assembling Switching Unit for Objects to be Measured
Appx. 6 Assembling Switching Unit for Objects to
be Measured
To improve the operating e󰀩ciency of the insulation resistance measurement, you can assemble a switching
device for the following cases:
• Measuring multiple objects in series, selecting a object to be measured with relays
• Measuring a objects that has multiple measurement points with respect to any two of the points in series,
selecting measurement points with relays
To measure objects precisely, consider various factors when assembling the switching device.
This chapter describes the following contents.
• Procedure for connecting objects to be measured and switching units to the instrument
• Precautions for selecting relays that are to be installed in the switching unit
• Circuit diagram of the switching unit
• Procedure for assembling the switching unit
Connecting objects to be measured and the switching unit to the
instrument
Two methods are available depending on the status of the objects to be measured.
If the objects to be measured are grounded
Because the OUTPUT terminal of the instrument is grounded, connect the switching unit to the INPUT
terminal.
Switching unit
Ground
Objects to be
measured
The instrument
INPUT
OUTPUT
If the objects to be measured are not grounded
Measurement can be performed using the same method given in “If the objects to be measured are grounded,”
but you can also measure objects with the switching unit connected to the OUTPUT terminal as follows.
Switching unit
Objects to be
measured
The instrument
INPUT
OUTPUT
Appx.