VXI VT1422A - Manual (Page 119)

Programming the VT1422A for Data Acquisition and Control 117 Chapter 4
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VT1529A/B channels provide both strain bridge completion and
bridge output sense so <ch_list> links strain EU conversion directly to
those channels.
Note
When the SENS:FUNC:STR:<bridge_type> command is used with
VT1529A/B channels, the bridge configuration switches for those channels
are set to actually configure the bridge type specified. There is no need to
send the configuration only SENSe:STRain:BRIDge:TYPE command for
channels that use the SENSe:FUNCtion:STRain:<bridge_type> command.
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The optional <range> parameter can be used to choose a fixed A/D
range. When not specified (defaulted), the module uses auto-range.
The following command sequence is for conventional strain completion SCPs.
For VT1529A/B based command sequences, see “Programming the
VT1422A & VT1529A/B for Remote Strain Measurement” on page 57.
To link channels 23 through 30 to the quarter bridge strain EU conversion:
SENS:FUNC:STR:QUAR (@123:130)
uses autorange
Other commands used to set up strain measurements are:
[SENSe:]STRain:POISson
[SENSe:]STRain:EXCitation
[SENSe:]STRain:GFACtor
[SENSe:]STRain:UNSTrained
NOTE
Because of the number of possible strain gage configurations, the driver
must generate any Strain EU conversion tables and download them to the
instrument when INITiate is executed. This can cause the time to complete
the INIT command to exceed one minute.
See the Command Reference (Chapter 7) and the VT1506A/07A and
VT1511A User’s Manuals for more information on strain measurements.
Custom EU Conversions
See “Creating and Loading Custom EU Conversion Tables” on page 150.
Linking Output
Channels to
Functions
Analog outputs are implemented either by a VT1531A Voltage Output SCP
or a VT1532A Current Output SCP. Channels where these SCPs are
installed are automatically considered outputs. No SOURce:FUNCtion
command is required since the VT1531A can only output voltage, while the
VT1532A can only output current. The only way to control the output
amplitude of these SCPs is through the VT1422A’s Algorithm Language.