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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 <ch_list>.
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 <excite_current> parameter (excitation current) does not control the current
applied to the channel to be measured. The <excite_current> 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 <excite_current> are 30E-6 (or MIN) and 488E-6
(or MAX). <excite_current> 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
Vdc
ch_list channel list (string) 100 - 163 none