VXI VT1422A - Manual (Page 348)

346 VT1422A Command Reference Chapter 7
[SENSe]
[SENSe:]FUNCtion:RESistance
[SENSe:]FUNCtion:RESistance <excite_current>,[<range>,](@<ch_list>)
links the EU conversion type for resistance and range with the channels specified
by .
Parameters
Comments •
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 4V 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 causes 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.
•
If using amplifier SCPs, set them first and keep their settings in mind when
specifying a range setting. For instance, if the expected signal voltage is to be
approximately 0.1 V dc and the amplifier SCP for that channel has a gain of 8,
<range> must be set no lower than 1 V dc or an input out-of-range condition
will exist.
•
Resistance measurements require the use of Current Source Signal Conditioning
Plug-Ons.
•
The parameter (excitation current) does not control the current
applied to the channel to be measured. The parameter only
passes the setting of the SCP supplying current to channel to be measured. The
current must have already been set using the OUTPUT:CURRENT:AMPL
command. The choices for are 30E-6 (or MIN) and 488E-6
(or MAX). may be specified in milliamps and microamps.
•
The *CAL? command calibrates resistance channels based on Current Source
SCP and Sense Amplifier SCP setup at the time of execution. If SCP settings
are changed, those channels are no longer calibrated. *CAL? must be executed
again.
•
See “Linking Input Channels to EU Conversion” on page 109.
•
When Accepted: Not while INITiated
•
Related Commands: OUTP:CURR, *CAL?
•
*RST Condition: SENSE:FUNC:VOLT AUTO on all channels and bridges set
to FBEN on all strain channels
•
Send with VXIplug&play Function: hpe1422_cmd(...)
Usage FUNC:RES 30ua,(@100,105,107)
Set channels 0, 5, and 7 to convert voltage
to resistance assuming current source set
to 30 µA use auto-range (default)
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
excite_current discrete(string) 30E-6 | 488E-6 | MIN | MAX Amps
range numeric (float32) see first comment V dc
ch_list channel list (string) 100 - 163 none