Attenuator Compensation; Figure 5 12: High Frequency Step Response Test Setup - Tektronix TAS 465 Service Manual

Adjustment Procedures
5 16
Pulse Generator
Precision Cable

Figure 5 12: High Frequency Step Response Test Setup

3. Set the pulse generator fast rise period to 1 ms and pulse amplitude to
mid range.
4. Press the AUTOSET button.
5. Set the volts/div scale to 10 mV.
6. Set the sec/div scale to 200 ns.
7. Press the VERTICAL MENU button and set CPLG to DC.
8. Adjust the vertical POSITION control and the generator pulse amplitude
to obtain a 5 division, vertically centered, display.
9. TAS 465 Only Adjust R141 and C122 on the Display Driver board for
flattest long term response of the pulse front corner.
10. Set the sec/div scale to 20 ns.
11. Adjust R140 and C121 on the Display Driver board for minimum signal
aberrations of the pulse front corner.
Some interaction of the adjustments made in steps 9 and 11 may
occur. For optimum oscilloscope performance, these steps should
be rechecked after making adjustments.
12. Disconnect the calibration setup from the oscilloscope.

Attenuator Compensation

Equipment Required: One pulse generator (item 10), one precision coaxial
cable (item 5), one 50 W termination (item 3), and one dual input coupler
(item 7).
Adjustment Locations: This procedure requires adjustments to the Analog
board. See Figure 5 15 on page 5 21 for the location of the adjustments.
50 W Termination
NOTE
Adjustment Procedures
5X Attenuator