11.12 Input Circuit Schematics
This section provides input circuit schematics for the instrument.
Analog input circuit: U8550, U8551, U8552, LR8530, LR8531, LR8532
• Voltage (10 mV f.s. to 2 V f.s. ranges), thermocouple
Channel switching relay
+
-
• Voltage (10 V f.s. to 100 V f.s. ranges, 1-5 V f.s. range), humidity
Channel switching relay
+
-
• Resistance temperature detector (4-wire), resistance
Channel switching relay
+
-
SoH
SoL terminal is common to all channels.
SoL
Ω
1 M
Constant-current circuit
Input Circuit Schematics
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