Tektronix ADA400A Instruction Manual page 60

Adjustment Procedures
LF Compensation
Adjustments
48
Table 21: Equipment Settings for CMRR Adjustments (Cont.)
Oscilloscope
Number of waveforms to average
Trigger source
Sine Wave Generator
Output
2. Connect a coaxial cable from trigger output of sine wave generator to Ch4 of
oscilloscope.
3. Connect dual input connector to inputs of ADA400A.
4. Connect 50 Ω terminator to dual input connector.
5. Connect two 10X attenuators to 50 Ω terminator.
6. Connect a coaxial cable from sine wave generator output to 10X attenuators.
7. Adjust trigger level for a steady display.
8. Adjust amplitude for 5 divisions (10 mV) on screen.
9. Remove the two 10X attenuators and connect the cable directly to the 50 Ω
terminator.
10. Set ADA400A '- -' input to DC.
11. Set oscilloscope to 2 mV/div.
12. Adjust CV4 and R18 for minimum signal amplitude (≤ 1 mV).
13. Disconnect setup.
Equipment One digitizing oscilloscope (item 1)
Required
One calibration generator (item 4)
One dual input coupler (item 6)
One 50 Ω terminator (item 7)
Two coaxial cables (item 9)
One adjustment tool (item 10)
1. Connect the ADA400A to Channel 1 and make the equipment settings
according to Table 22.
Setting
20
Ch4
Setting
100 kHz, 1 Vp-p into 50 Ω
ADA400A Differential Preamplifier