Figure 1-10 Connections For Model 7700 Dc Current Verification; Verifying Dc Current - Keithley 2700 Service Manual

1-22 Performance Verification

Verifying DC current

Check DC current accuracy by applying accurate DC currents from the DC current calibra-
tor to the input terminals of the Model 7700 and verifying that the displayed readings fall
within specified limits.
Follow these steps to verify DC current accuracy:
1.
Figure 1-10
Connections for Model 7700 DC current verification
Model 7700
CH5 CH6
CH4
INPUT SENSE CH1 CH2 CH3
H L H L H L H L
H L H L H L H L
H L H L H L H L H L H L H L H L
CH21 CH22 CH11 CH12 CH13 CH14 CH15 CH16
CH21
Connect the Model 7700 CH21 H and L terminals to the calibrator as shown in
Figure 1-10.
CH7 CH8 CH9 CH10
H L H L H L H L
INPUT
(V, 2 WIRE)
SENSE
(OHMS, 4 WIRE)
H L H L H L H L
CH17 CH18 CH19 CH20
Calibrator (Output DC Current)
Output HI
Output
LO
Note: Be sure calibrator is set for
normal current output.