VXI VT1422A - Manual (Page 352)

350 VT1422A Command Reference Chapter 7
[SENSe]
[SENSe:]FUNCtion:STRain:<bridge_type>:POST [<range>,](@<ch_list>)
links the post-processing strain EU conversion with the VT1529B channels specified
by <ch_list> to measure the strain bridge output. See “Strain Measurement
Command Sequence” on page 165.
Both the strain channels and excitation channel should appear in the scan list set
by ROUT:SEQ:DEF.
Note
When the SENS:FUNC:STR:<bridge_type>:POST 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 VT1529A/B
channels that use the SENSe:FUNCtion:STRain:<bridge_type> command.
These commands are valid only on the VT1529B and are available with
VXIplug&play driver revision A.01.09 or later (revision A.01.06 or later of
hpe1422_32.dll).
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 first INIT command to
exceed one minute on some platforms. Subsequent INITs (with no other configuration
changes) do not need to regenerate EU tables and execute much faster.
Parameters
Comments •
The VT1529B provides the strain measurement bridges and their excitation
voltage sources. <ch_list> specifies the voltage sensing channels that are to
measure the bridge outputs.
•
The VT1422A has five ranges: 0.0625 V dc, 0.25 V dc, 1 V dc, 4 V dc, and
16 V dc. To select a range, simply specify the range value (for example, 4 selects
the 4 V dc range). If a value is specified that is larger than one of the first four
ranges, the VT1422A selects the next higher range (for example, 4.1 selects the
16 V dc range). Specifying a value larger than 16 generates an error. Specifying
0 selects the lowest range (0.0625 V dc). Specifying AUTO selects auto range.
The default range (no range parameter specified) is auto range.
•
The VT1529B has a fixed gain of 32. Keep this in mind <range> is set.
•
When Accepted: Not while INITiated
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
range numeric (float32) see comments V dc
ch_list channel list (string) 10000 - 15731 none