Tektronix TEKFAX ADA400A, Instruction Manual

Page: 47 / 80

Performance Verification
ADA400A Differential Preamplifier
35
2. Connect a coaxial cable from sine wave generator trigger output to Ch4 of
the 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 the amplitude of the sine wave generator for 5 divisions 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 1 mV/div.
12. Measure signal is
≤
1 division (1 mV, 60 dB).
13. Modify the equipment settings according to Table 13.
Table 13: Equipment Settings for X100, 10 kHz CMRR Checks
ADA400A Setting
Upper Bandwidth 100 kHz
Oscilloscope Setting
Vertical gain 2 mV/div
Time base 50 s/div
Sine Wave Generator Setting
Output 10 kHz
14. Set ‘--’ input to GND .
15.
Do steps 5 to 10.
16. Set oscilloscope to 10 V/div. Measure trace is
<
3.2 divisions wide (32 V,
90 dB).
17.
Modify the equipment settings according to Table 14.