Keithley 6487 User Manual page 51

3-4 Measurements and Sourcing Voltage
The Model 6487 has a zero correct feature to algebraically subtract the voltage offset term
from the measurement. Perform the following steps to algebraically zero correct the
measurement:
1.
2.
3.
4.
5.
6.
NOTES With regard to the zero correct feature:
SCPI programming — zero check and zero correct
Table 3-3
SCPI commands — zero check and zero correct
SYST:ZCH <b>
SYST:ZCOR <b>
SYST:ZCOR:ACQ
INIT
Enable zero check by pressing ZCHK ("ZEROCHK" message displayed).
Select the range that will be used for the measurement or select the lowest range.
Press REL to enable zero correct (MON annunciator turns on).
Press ZCHK to disable zero check.
Readings can now be taken from the display. The MON annunciator indicates that
the displayed reading is zero corrected.
To turn off zero correct, press REL again with zero check enabled.
• The Model 6487 will remain zero corrected even if it is upranged. If down-
ranged, re-zero the instrument.
• The Model 6487 does not have to be re-zero corrected as long as the ambient
temperature remains stable.
• Zero correction cancels the voltage offset term of the amplifier. With zero
correct enabled, the instrument may not display a perfectly zeroed reading.
• If the Model 6487 is operating at, or near T
very little effect. T
last calibrated.
Commands
Enable (ON) or disable (OFF) zero check.
Enable (ON) or disable (OFF) zero correct.
Acquire zero correct value.
Trigger a reading.
is the internal temperature of Model 6487 when it was
CAL
Description
Model 6487 User's Manual
, zero correction will have
CAL