Keithley 2700, Service Manual

Page: 47 / 174

Performance Verification 1-31
4. Select the Model 2700 RATIO function (press SHIFT then RATIO).
5. Set the calibrator output to 1.00000V DC, and allow the reading to settle.
6. Verify that the ratio reading is between 0.9999926 and 1.000074.
7. Press OPEN to open Channel 1.
Figure 1-16
Connections for Model 7700 ratio and average 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
CH11
Output
HI
Output
LO
DC Voltage Calibrator
Note: Use shielded cables to minimize noise.
Model 7700