Trane Symbio 500 Installation, Operation And Maintenance Manual page 48

Commissioning and Troubleshooting in Powered State
General Information
Method 2 interferes less in
regards to the system. In
voltage mode, the DMM
affects the circuit less.
Additional information is
needed to translate the
voltage measured to current
flowing through the circuit.
48
Checkout Procedure
Step 1
Step 2
Measured Voltage Across a Linear Current Input
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0 2 4 6 8 10 12
Linear Current Input–mA
Measurement
Measure AC voltage across
the voltage input
Measure DC voltage across
the voltage termination
14 16 18 20
Expected Value
Vac ≈ 0.0 V
AC voltage will affect further
measurement
See the chart below
BAS-SVX090B-EN