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Input Circuit Schematics
11.13 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
1 M
Ω
• Resistance temperature detector (4-wire), resistance
＋
－
SoH
SoL
Channel switching relay
Constant-current circuit
SoL terminal is common to all channels.
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