Keithley 2182 Quick Reference Manual - Measurement Considerations
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
Select function: ‘VOLTage’ or ‘TEMPerature’.
:SENSe:CHANnel
Select channel: 0 (internal temperature sensor), 1, or 2.
:SENSe:VOLTage:CHANne1l:RANGe
Select channel 1 measure range;
:SENSe:VOLTage:CHANnel1:RANGe:AUTO
Enable/disable channel 1 auto range; (ON or OFF).
:SENSe:VOLTage:CHANnel2:RANGe
Select channel 2 measure range;
:SENSe:VOLTage:CHANnel2:RANGe:AUTO
Enable/disable channel 2 auto range; (ON or OFF).
:SENSe:TEMPerature:TRANsducer
Choose sensor type: TCouple or INTernal.
:SENSe:TEMPerature:RJUNction:RSELect
Select reference: SIMulated or INTernal.
:SENSe:TEMPerature:RJUNction:SIMulated
Set simulated reference temperature in °C: 0 to 60.
:SENSe:TEMPerature:TCouple
Set thermocouple type: J, K, T, E, R, S, B, or N.
:UNIT:TEMPerature
Set temperature units: C, F, or K.
:READ?
Trigger and acquire one data string.