Keithley 2700, Service Manual

Page: 36 / 174

1-20 Performance Verification
Verifying AC voltage
Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from
the AC voltage calibrator to the Model 7700 inputs and verifying that the displayed readings
fall within specified ranges.
CAUTION Do not exceed 300V RMS between plug-in module INPUT H and L termi-
nals or between adjacent channels, or 8
×
10
7
V•Hz input, because instru-
ment damage may occur.
Follow these steps to verify AC voltage accuracy:
1. Connect the Model 7700 CH1 H and L INPUT terminals to the AC voltage calibrator as
shown in
Figure 1-9 .
Figure 1-9
Connections for Model 7700 AC volts verification
H L H L
AMPS
H L H L H L H L H L H L
LO
CH21 CH22 CH11 CH12 CH13 CH14 CH15 CH16
H L H L H L H L
CH17 CH18 CH19 CH20
SENSE
(OHMS, 4 WIRE)
INPUT
(V, 2 WIRE)
H L H L H L H L
CH7 CH8 CH9 CH10
H L H L H L H L
H L H L H L H L
INPUT SENSE CH1 CH2
CH3 CH4
CH5 CH6
CH1
Output HI
Output
LO
Calibrator (Output AC Voltage)
Model 7700
Amplifier (Connect to calibrator)
Shielded
Cable