VXI VT1422A - Manual (Page 359)

VT1422A Command Reference 357 Chapter 7
[SENSe]
[SENSe:]REFerence:POST
[SENSe:]REFerence:POST THERmistor,<resistance>,[<range>,]
(@<exc_ch>),(@<thr_ch>)
links the thermistor channel in <thr_ch> to the
excitation voltage channel in <exc_ch> and to the reference junction temperature EU
conversion. The excitation channel is automatically set to SENS:FUNC:HVOL and
the thermistor channel is set to SENS:FUNC:VOLT. The excitation channel must be
on the same VT1529B as the thermistor channel.
The reference junction temperature EU conversion assumes the divider circuit shown
in Figure 5-5 on page 173. If a total resistance value other than 400 k
Ω is used, the
sum of the resistor values can be specified with the SENS:REF:THER:RES command.
Both the thermistor channel and the excitation channel should appear in the scan list
set by the ROUT:SEQ:DEF command. If the excitation channel is also used for strain
measurements, it only needs to appear once in the scan list.
This command is valid only on the VT1529B and is available with VXIplug&play
driver revision A.01.09 or later (revision A.01.06 or later of hpe1422_32.dll).
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 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 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.
•
The VT1529B has a fixed gain of 32. Keep this in mind when <range> is set.
•
See “Temperature Measurement Command Sequence” on page 174.
•
Related Commands: SENS:FUNC:TEMP:POST,
SENS:REF:THER:RES:POST
•
*RST Condition: No reference assigned
•
Send with VXIplug&play Function: hpe1422_cmd(...)
Usage SENS:REF:POST THER,5000,4,(@10000),(@10001) sense the reference temperature on ch
10001; excitation is on ch 10000;
measure on 4 V range
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
resistance numeric (float32) 5000 (value is ignored) ohm
range numeric (float32) see comments V dc
exc_ch channel 10000 - 15731
(one channel only)
thr_list channel list (string) 10000 - 15731 none