Keithley 7708 User Manual page 25

Verifying frequency
Follow the steps below to verify the Model 27xx frequency function:
1. Connect the function generator to the Model 7708 CH1 H and L INPUT terminals. (See
2. Install the Model 7708 in Slot 1 of the Model 27xx, then turn on the power, and allow the unit to warm up for one hour
before proceeding. Be sure the front panel INPUTS switch is set to the REAR position.
3. Set the function generator to output a 1kHz, 1V RMS sine wave.
4. Select the Model 27xx frequency function by pressing the FREQ key. Close Channel 1 by pressing the CLOSE key and
keying in 101.
5. Verify that the Model 27xx frequency reading is between 0.9999kHz and 1.0001kHz.
Figure 14
Connections for frequency verification
CH1
H L H L H L
CH2 CH3
CH1
H L H L
CH1 CH2
H L H L H L H L H L H L
H L H L H L
CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12
Model 7708
H L H L
CH13 CH14
50Ω
Coax Cable
Function
Output
Figure 14.)
Function Generator
21