Keithley 2182, Quick Reference Manual, Page: 15 / 30

Quick Reference Guide 9
Measurement considerations
For sensitive measurements, keep these points in mind to maximize measurement accuracy:
• Use only clean, copper-to-copper connections to minimize thermal EMFs.
• Use the REL mode to null out offsets:
– Connect the circuit, but leave the source disconnected.
– Select DCV1 or DCV2 as appropriate.
– Press REL to null offsets.
– Repeat for other channel if needed.
– Connect the source, and make the measurement.
• Keep the Model 2182 and test circuit away from electrical noise sources, and shield
if necessary.
Remote command programming
Data string
The :READ? command is typically used to trigger a reading and request the data string.
The data string is sent to the computer when the Model 2182 is addressed to talk.The data
string can be made of up to three elements separated by commas. The first element is the
voltage or temperature reading, the second is the channel, and the third is the units. A
single element (reading-only) data string is the default condition. See Section 14,
FORMat
subsystem, of the Model 2182 User’s Manual for details on all aspects of the data format.
SCPI commands
SCPI commands to measure voltage and temperature are provided in Table 3.
Table 3
SCPI commands for voltage and temperature measurements
Command Description
:SENSe:FUNCtion <name> Select function: ‘VOLTage’ or ‘TEMPerature’.
:SENSe:CHANnel <chan> Select channel: 0 (internal temperature sensor), 1, or 2.
:SENSe:VOLTage:CHANne1l:RANGe <n> Select channel 1 measure range; <n> = range.
:SENSe:VOLTage:CHANnel1:RANGe:AUTO <b> Enable/disable channel 1 auto range; (ON or OFF).
:SENSe:VOLTage:CHANnel2:RANGe <n> Select channel 2 measure range; <n> = range.
:SENSe:VOLTage:CHANnel2:RANGe:AUTO <b> Enable/disable channel 2 auto range; (ON or OFF).
:SENSe:TEMPerature:TRANsducer <name> Choose sensor type: TCouple or INTernal.
:SENSe:TEMPerature:RJUNction:RSELect <name> Select reference: SIMulated or INTernal.
:SENSe:TEMPerature:RJUNction:SIMulated <n> Set simulated reference temperature in °C: 0 to 60.
:SENSe:TEMPerature:TCouple <type> Set thermocouple type: J, K, T, E, R, S, B, or N.
:UNIT:TEMPerature <name> Set temperature units: C, F, or K.
:READ? Trigger and acquire one data string.