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: 0.0625V dc, 0.25 Vdc, 1 Vdc, 4 Vdc, and
16 Vdc. To select a range, simply specify the range value (for example, 4 selects
the 4 Vdc 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 Vdc range). Specifying a value larger than 16 generates an error. Specifying
0 selects the lowest range (0.0625 Vdc). 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 Vdc and the amplifier SCP for that channel has a gain of 8,
<range> must be set no lower than 1V 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 Vdc
ch_list channel list(string) 100 - 163 none