2-20 Voltage and Temperature Measurements
Nulling thermal EMFs
The following procedure nulls out thermal EMFs using the Relative feature of the
Model 2182. For more information on thermal EMFs, see “Low-level considerations; Thermal
EMFs.” Details on Relative are provided in Section 4.
1. Connect the test circuit but leave the source (voltage or current) disconnected or in
stand-by.
2. Select the appropriate voltage function; DCV1 or DCV2.
3. If not using AUTO range, select the lowest possible measurement range to display the
voltage offset.
4. On the Model 2182, press the REL key to zero the display.
5. If applicable, repeat steps 2 through 4 for the other channel.
6. Connect the source. Subsequent readings will not include the thermal EMFs that were
nulled out.
SCPI programming - voltage and temperature measurements
Table 2-3
SCPI commands - voltage and temperature measurements
Commands Description Default
:SENSe
:FUNCtion <name> Select function: ‘VOLTage’ or ‘TEMPerature’. VOLT
:CHANnel <chan> Select measurement channel: 0, 1 or 2 (see Note). 1
:DATA Return 2182 readings:
[:LATest]? Return the last reading.
:FRESh? Return a new (fresh) reading.
:TEMPerature Configure temperature measurements:
:TRANsducer <name> Select sensor: TCouple or INTernal. TCouple
:RJUNction Configure reference junction:
:RSELect <name> Select reference: SIMulated or INTernal. INTernal
:SIMulated <n> Specify simulated reference temperature in ˚C: 0 to 60. 23
:TCouple <type> Specify thermocouple type: J, K, T, E, R, S, B, or N. J
:UNIT
:TEMPerature <name> Select units designator: C, F, or K. C
Note: Channel 0 is the internal temperature sensor. With a temperature function selected, reading Channel 0 returns the inter-
nal temperature reading. With a voltage function selected, reading Channel 0 returns the voltage reading of the internal
temperature sensor.
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