BAS-SVX090B-EN
51
Note: The reference voltage must always be DC.
The voltage across the pulse meter terminals will bounce between Vsat (saturation voltage) of the
transistor in the pulse meter and the Vref (reference voltage) provided by the UI or AO circuits of the
Symbio 500. Most bipolar transistors have a Vsat of less than 0.2 Vdc.
The DMM sampling rate may be too slow to measure pulse meter output transitions.
Note: Check the specifications of the DMM being used. It may be necessary to use an oscilloscope to
measure the transition voltages.
Voltage Analog Output
Measurement Procedure
Expected Value
Measure DC voltage across the voltage termination
Compare to the expected value based on request from
controller. This request may be based on an override of the
output value.
Current Analog Output, Methods 1 or 2
General Information and Checkout
Procedure Measurement
Expected Value
Method 1: Shorting the current output-
this method leaves the circuit intact,
however, it will cause the vast majority of
the current to flow through the meter
instead of the load (NOTE LOAD
RESISTANCE).
Measure DC current across the current
termination
Compare expected value based on
request from controller. This request may
be based on an override of the output
value.
Method 2: Measuring current directly-
this method is most the typical way to
measure current and has the advantage
of leaving the load in the loop. However,
the circuit must be broken when using
this method.
Measure DC current in series with the
current termination
Compare expected value based on
request from controller. This request may
be based on an override of the output
value.
Commissioning and Troubleshooting in Powered State
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