Yokogawa µR20000 - Manual (Page 21)

3-8 SM 04P01B01-01E
3.4 Test Procedures
Insulation Resistance
● Procedures
Perform a measurement with an insulation tester and check whether the results meet
the criteria. Perform the measurement with the power switch turned ON.
Criteria
Terminals Measured Criteria Condition
Between the power and earth terminals 100 MΩ or more Short the L and N terminals.
Between the input and earth terminals 100 MΩ or more Short all input terminals.
Between input terminals 100 MΩ or more Short the odd and even channels of
the +/A, −/B, and b* terminals, and
measure between odd and even
channels.
Between the relay contact output 100 MΩ or more With the /A1, /A2, /A3, or /F1
terminals and earth terminals option. Short all relay contact
output terminals.
Between remote control input 100 MΩ or more With the /R1 option.
C terminal and earth terminals
Between the RS-422A/485 SG 100 MΩ or more With the /C3 option.
terminals and earth terminals
Between the Ethernet terminal 100 MΩ or more With the /C7 option. Short all
and earth terminals. input/output terminals
* With the dot model without the /N2 option, exclude the b terminal. The b terminals are
connected to all channels.
Protective Grounding
● Procedures
Perform a resistance measurement with a DMM (Digital Multi Meter), and check
whether the results meet the criterion.
Criterion
Measured Location Criterion
Between earth terminal and power supply heat sink 0.2 Ω or less
Heat sink
Earth terminal