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Rev 1 2018-03-21 www.elcon.se
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7.2.4 CHECK RESISTANCE MEASURING INPUTS UR, IR.
Check of Ur (Voltage measuring for resistance).
Connect a stable dc power supply of 0.2 V DC parallel to a calibrated
reference voltmeter, described as (Ref.)
To verify positive measurement connect.
DC Supply + Res+, +V (Ref.).
DC Supply - Res-, COM (Ref.).
To verify negative measurement connect.
DC Supply - Res+, +V (Ref.).
DC Supply + Res-, COM (Ref.).
Verify in BTS11 that the input is within the specification.
Voltage measure: Ur 0 - 225 mV DC, Accuracy < 0.0002V DC
Analog resolution: 12 bits. Resolution about 0.000111V DC / Bit
Check of Ir (Current measuring for resistance).
Connect a calibrated current shunt 100 -500 µohm, accuracy 1% to
To verify positive
measurement connect.
To verify negative
measurement connect.
Current shunt + Res+
Current shunt - Res-
Current shunt - Res+
Current shunt + Res-
Verify in BTS11 that the input is within the specification.
Current measure Ir 0 - 240 A DC. Accuracy < 2A DC
Analog resolution: 12 bits. Resolution about 0.07A DC / Bit.
Resistance measure: Res 0 - 1000 ohm. Accuracy < 2ohm.
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