Adjustment
Adjustment Procedures
74
18. Press UTILITY.
19. Press the main menu button Timing. Read the onscreen text before
continuing.
20. Press the side menu button OK Compensate Timing. Follow the instruc
tions on the screen.
Use this procedure to adjust the lowfrequency compensation of the channel
1 and channel 2 attenuators. You should perform this procedure if your
oscilloscope demonstrates gross rounding or overshoot of squarewave input
signals or if your instrument fails one of the Performance Tests in the previous
section.
1. Remove the instrument cabinet as described in the removal procedure on
page 813.
2. Set the oscilloscope on its left side with its front facing toward you.
3. Power up the oscilloscope and press SAVE/RECALL SETUP.
4. Press the main menu button Factory; then press the side menu button
OK Confirm Factory Init.
5. Press CLEAR MENU.
6. Connect the high output of a calibration generator (Item 5) to the CH 1
BNC through a 50 W coaxial cable (Item 3) and a 50 W termination
(Item 2). (See Figure 73.)
7. Set the calibration generator to output a high amplitude, 1 kHz signal. Set
the pulse amplitude to 25%.
8. Set the oscilloscope VOLTS/DIV to 200 mV, the SEC/DIV to 10 ms, and
adjust the pulse amplitude for a five division display.
9. Press SET LEVEL TO 50%.
10. Use the vertical POSITION control to place the top of the waveform near
center screen.
11. Set the VOLTS/DIV to 100 mV.
12. Use an adjustment tool (Item 1) to adjust the CH 1 10X capacitor for the
flattest response. (See Figure 73.)
13. Remove the 50 W termination from the setup.
14. Set the VOLTS/DIV to2V.
15. Press SET LEVEL TO 50%.
Attenuator
Adjustment
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