Verifying Ac Voltage - Keithley 2750 Service Manual

1-22 Performance Verification
Table 1-10
Plug-in module DCV reading limits
Range
100mV
100V
1000V
*Source positive and negative values for each range.

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
Follow these steps to verify AC voltage accuracy:
1.
Figure 1-10
Connections for Model 7700 AC volts verification
CH1
CH5
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
Model 7700
Applied DC Voltage*
100.0000mV
1V 1.000000V
10V 10.00000V
100.0000V
300.000V
Do not exceed 300V RMS between the 7700 plug-in module INPUT H and
L terminals or between adjacent channels, or 8  10
instrument damage may occur.
Connect the Model 7700 CH1 H and L INPUT terminals to the AC voltage calibra-
tor as shown in Figure
CH6
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
Model 2750 Multimeter/Switch System Service Manual
Reading Limits (1 year, 18° to 28°C)
99.9935 to 100.0065mV
0.999963 to 1.000037V
9.99965 to 10.00035V
99.9946 to 100.0054V
299.976 to 300.024V
1-10.
Amplifier (Connect to calibrator)
Output
HI
Shielded
Cable
Output
LO
7
VHz input, because
Calibrator (Output AC Voltage)