Keithley 617 - Page 12

ZERO CHECK
and ZERO CORRECT
ZERO CHECK
ZERO CORRECT
DESCRIPTION
The zero check feature provides a means for internal zero verification.
The zero correct feature, when used with zero check, corrects internal
offsets in the instrument 50 that the display raads zero. In the zero check
mode, the input impedance of the Model 617 is changed as outlined in
the following table.
INPUT IMPEDANCE WITH ZERO CHECK ENABLED
IFUNCTION I RANGE 1 IMPEDANCE IN ZERO CHECK
Volts
Reistance
Coulombs
Current
All
IOMg II 2CpF
All kg, 2MG
SOSkG U 112OpF
20MQ, 2OOMS, 9.09MG II 47pF
All GG
All 1OMQ I 102OpF
All pA 1OMg II 25pF
All nA 9.09Mn II 47pF
AlI fi
99kn II 102OpF
All mA
lOOn II 2OpF
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