See figure 3-20 – VXI VT1422A User Manual
Page 93
Programming the VT1422A & VT1529A/B for Remote Strain Measurement 91
Figure 3-20. Performing Shunt Calibration
Set up the analog input Scan List to
measure un-shunted channels
Measure unstrained bridge output
voltages and send to EU routines
Send gage factors to
channel EU routines
SENSe:STRain:GFACtor
MEASure:VOLTage:UNSTrained?
ROUTe:SEQuence:DEFine (@
)
<ch_list>
Measure bridge excitation
voltages and get from FIFO
MEASure:VOLTage:EXCitation?/SENSe:DATA:FIFO?
Measure unstrained bridge output
voltages and get from FIFO
MEASure:VOLTage:UNSTrained?/SENSe:DATA:FIFO?
To convert readings to
Engineering Units of strain
SENSe:FUNCtion:STRain:<bridge_type>. Also sets
bridge config switches and turns on excitation V
Set up Trigger System to scan
strain bridge channel
TRIG:SOURce IMM
Initiate Trigger System
INITiate[:IMMediate]
Retrieve un-shunted strain
readings from FIFO
SENSe:DATA:FIFO?
Select INTernal or EXTernal
shunt resistor
OUTPut:SHUNt:SOURce
Set up the analog input Scan List to
measure single shunted channel
ROUTe:SEQuence:DEFine (@
)
<shunt_channel>
Turn on shunt resistor
to slected channel
OUTPut:SHUNt:STATe ON (@
)
<shunt_channel>
Initiate Trigger System
(measure shunted strain channel)
INITiate[:IMMediate]
Retrieve shunted strain
reading from FIFO
SENSe:DATA:FIFO?