VXI VT1422A - Manual (Page 307)

VT1422A Command Reference 305 Chapter 7
MEASure
Notes
1. Unlike the MEAS:VOLT:EXC? command, the individual command sequence
above cannot keep defined algorithms from running at INIT. Since algorithms
can place values into the FIFO buffer, it will be necessary to determine which
FIFO values are the excitation voltages.
2. Remember that the MEAS:VOLT:EXC? command also provides the average
of 32 measurements for each excitation value.
Parameters
Comments •
This command is only for use on channels measured with the VT1529A/B. If
executed on channels connected to other strain SCPs, a 3007 "Invalid signal
conditioning plug-on" error message will be generated
•
This command executes a measurement scan without running defined
algorithms. This is to keep algorithms from placing values in the FIFO buffer.
•
The measurement sample interval is 392 µs
•
Filter settings and states are not changed by this command.
•
After completing the measurements, the instrument is re-configured to the same
settings that existed before the command was executed.
•
When Accepted: Not while INITiated
•
Related Commands: SENSe:STRain:EXCitation, MEAS:VOLT:UNST?
•
*RST Condition: Channel excitation voltage values are not affected by *RST.
However, *RST changes the function for all analog input channels to Voltage.
When a strain channel is changed back to the strain function with a
SENS:FUNC:STRAIN... command, the excitation voltage values for these
channel will still be in effect. Of course, loss of power will cause the excitation
values to be lost.
•
Returned Value: numeric, number of channel values in FIFO. The type is int16.
•
Send with VXIplug&play Function: hpe1422_cmdInt16_Q(...)
Usage MEAS:VOLT:EXC? (@10000:10931)
determine excitation voltage on 128
strain channels through VT1539As in
SCP positions 0 and 1
SENS:DATA:FIFO:RESET
As in most cases, since the values have
been sent to the strain EU conversion,
the individual excitation values do not
need to be seen.
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
ch_list channel list (string) 10000 - 15731 none