[SENSe:]REFerence
[SENSe:]REFerence <
sensor_type
>,<
sub_type
>,[<
range
>,](@<
ch_list
>)
links the
channel in
<
ch_list
>
to the reference junction temperature EU conversion based on
<
sensor_type
>
and
<
sub_type
>
. When scanned, the resultant value is stored in the
Reference Temperature Register, and by default the FIFO and CVT. This is a
resistance temperature measurement and uses the on-board 122
µ
A current source.
Note
The reference junction temperature value generated by scanning the reference
channel is stored in the Reference Temperature Register. This reference temperature
is used to compensate all subsequent thermocouple measurements until the register is
overwritten by another reference measurement or by specifying a constant reference
temperature with the
SENSe:REFerence:TEMPerature
command. If used, the
reference junction channel must be scanned before any thermocouple channels.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
<
sensor_type
>
discrete (string)
THERmistor | RTD | CUSTom
none
<
sub_type
>
numeric (float32)
numeric (float32)
for THER use 5000
for RTD use 85 | 92
for CUSTom use 1
Ohm
none
none
<
range
>
numeric (float32)
.0625 | .25 | 1 | 4 | 16
(See Comments below)
VDC
<
ch_list
>
channel list (string)
100 - 163
none
Comments
•
See “ Linking Channels to EU Conversion” in Chapter 3 for more information.
•
The
<
range
>
parameter: The HP E1413 has five ranges: .0625 VDC, .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 you specify a value larger than one of
the first four ranges, the HP E1413 selects the next higher range (for example, 4.1
selects the 16 VDC range). Specifying a value larger than 16 generates Error -222,
“ Data out of range” . Specifying
0
selects the lowest range (.0625 VDC). Specifying
AUTO
selects autorange. The default range (no range parameter specified) is
autorange. Autorange is not allowed while
SENSe:FILTer:LPASs:STATe
is
ON
.
Error +3072, “ Autorange not allowed with SENSE:FILTER on” will be generated at
INITiate:IMMediate
time if the filter is
ON
and any channel specifies autorange.
<
range
>
may be specified in millivollts (mv).
•
If you are using amplifier SCPs, you should set them first and keep their settings
in mind when specifying a range setting. For instance, if your expected signal
voltage is to be approximately .1 VDC and the amplifier SCP for that channel has
a gain of 8, you must set
<
range
>
no lower than 1 VDC or an input out-of-range
condition will exist.
[SENSe:]
246 HP E1313/E1413 Command Reference
Chapter 5
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