VXI VT1422A - Manual (Page 344)

342 VT1422A Command Reference Chapter 7
[SENSe]
[SENSe:]FUNCtion:CUSTom:REFerence
[SENSe:]FUNCtion:CUSTom:REFerence [<range>,](@<ch_list>) links channels
with the custom Engineering Unit Conversion table loaded with the
DIAG:CUST:PIECE command. Measurements from a channel linked with
SENS:FUNC:CUST:REF will result in a temperature that is sent to the Reference
Temperature Register. This command is used to measure the temperature of an
isothermal reference panel using custom characterized RTDs or thermistors.
Parameters
Comments •
See “Creating and Loading Custom EU Conversion Tables” on page 150.
•
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.
•
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.
•
The *CAL? command calibrates temperature channels based on 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.
•
Related Commands: DIAG:CUST:PIEC, SENS:FUNC:TEMP,
SENS:FUNC:CUST:TC, *CAL?
•
*RST Condition: all custom EU tables erased
•
Send with VXIplug&play Function: hpe1422_cmd(...)
Usage program must put table constants into array table_block
DIAG:CUST:PIEC 1,table_block,(@108)
send characterized reference transducer
table for use by channel 8
SENS:FUNC:CUST:REF .25,(@108)
link custom ref temp EU with ch 8
include this channel in a scan list with thermocouple channels (REF channel first)
INITiate then TRIGger module
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
range numeric (float32) see comments V dc
ch_list channel list (string) 100 - 163 none