Tektronix TEKFAX ADA400A, Instruction Manual

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Performance Verification
ADA400A Differential Preamplifier
33
12. Adjust vertical position knob on oscilloscope to center square wave on
screen.
13.
Check DC gain accuracy is
±
2% (4.9 V to 5.1 V).
14. Set ADA400A gain setting to 0.1.
15.
Set calibration generator to 20 V amplitude.
16. Adjust vertical position knob on oscilloscope to center square wave on
screen.
17. Check DC gain accuracy is
±
2% (19.6 V to 20.4 V).
18.
Disconnect setup from the inputs of the ADA400A.
Equipment
Required One digitizing oscilloscope (item 1)
One dual input coupler (item 6)
1. Connect the ADA400A to Ch1 of the oscilloscope.
Table 11: Equipment Settings for Offset Adjust
ADA400A Setting
+ Input Gnd
-- Input Gnd
Gain 0.1
Offset OFF
Coarse fully CCW
Fine fully CCW
Oscilloscope Setting
Vertical input impedance
1
M
Ω
Vertical Coupling DC
Vertical gain 50 V/div
Vertical Position 0 V (mid-scale)
2. Verify that the trace is centered vertically on the screen.
3. Turn the Offset to ON.
4.
Adjust the Coarse knob fully clockwise (CW).
5. Verify that the oscilloscope trace raises at least 4 divisions.
Offset Adjust