Table 11: Equipment Settings For Offset Adjust - Tektronix ADA400A Instruction Manual

Offset Adjust
ADA400A Differential Preamplifier
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 One digitizing oscilloscope (item 1)
Required
One dual input coupler (item 6)
1. Connect the ADA400A to Ch1 of the oscilloscope.

Table 11: Equipment Settings for Offset Adjust

ADA400A
+ Input
- - Input
Gain
Offset
Coarse
Fine
Oscilloscope
Vertical input impedance
Vertical Coupling
Vertical gain
Vertical Position
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.
Performance Verification
Setting
Gnd
Gnd
0.1
OFF
fully CCW
fully CCW
Setting
1 MΩ
DC
50 V/div
0 V (mid-scale)
33