Preparation For Adjustment

It is necessary to remove the instrument cabinet to perform the Adjustment Procedure. See the "Cabinet" removal instructions located in the "Maintenance" section of the manual.

Before performing this procedure, do not preset any internal controls and do not change the —8.6-V Power-Supply adjustment, since that will typically necessitate a complete readjustment of the instrument, when only a partial readjustment might otherwise be required. To avoid unnecessary readjustment, only change an internal control setting whenever a Performance Characteristic cannot be met with the original setting. If it is necessary to change the setting of any internal control, always check Table 5-1 for possible interacting adjustments that might be required.

All test equipment items described in Table 4-1 are required to accomplish a complete Adjustment Procedure. At the beginning of each subsection there is an equipment-required list showing only the test equipment necessary for performing the steps in that subsection. In this list, the item number following each piece of equipment corresponds to the item number listed in Table 4-1.

Make initial control settings as listed at the beginning of each subsection. Then connect the test equipment to an appropriate ac-power-input source and connect the 2213 to a variable autotransformer (Item 10 in Table 4-1) that is set for 115 V ac. Apply power and allow a 20-minute warm-up period before commencing any adjustments.

The most accurate display adjustments are made with a stable, well-focused, low-intensity display. Unless otherwise noted, adjust the AUTO INTENSITY, AUTO FOCUS, and TRIGGER LEVEL controls as needed to view the display.

Wherever possible in this procedure, instrument performance is first checked before an adjustment is made. Steps containing both checks and adjustments are titled "Check/Adjust." Those steps with only checks are titled "Check."

INDEX TO ADJUSTMENT PROCEDURE

Power Supply and CRT Display Page

1. Check/Adjust Power Supply DC Levels and Ripple 5-4

2. Check High-Voltage Supply 5-5

3. Adjust CRT Grid Bias 5-5

4. Adjust Astigmatism and Auto Focus Tracking. . . . 5-5

5. Check/Adjust Trace Alignment 5-5

6. Adjust Geometry 5-6

Vertical

1. Adjust Vertical Gain 5-7

2. Adjust Attenuator Step Balance 5-8

3. Adjust Attenuator X10 Balance 5-8

4. Check Deflection Accuracy and Variable Range . . 5-8

5. Check Input Coupling 5-9

6. Check ALT and CHOP Operation 5-9

7. Check VOLTS/DIV Variable Control

Trace Shift 5-9

8. Adjust Invert Balance 5-9

9. Adjust Trigger Balance 5-9

10. Adjust Attenuator Compensation 5-10

11. Adjust Vertical Output Amplifier Compensation . .5-10

12. Adjust Channel Matching and Check Bandwidth . .5-11

13. Check Common-Mode Rejection Ratio 5-11

14. Check Channel Isolation 5-12

15. Check POSITION Control Range 5-12

Horizontal

1. Adjust Horizontal Amplifier Gain 5-13

2. Adjust Magnifier Registration 5-13

3. Adjust 5-/zs Timing 5-14

4. Adjust High-Speed Timing 5-14

5. Check Timing Accuracy 5-14

6. Check SEC/DIV Variable Range 5-15

7. Check Delay Time Range 5-15

8. Check Delay Time Jitter 5-15

9. Check POSITION Control Range 5-16

10. Adjust X-Gain 5-16

11. Check X-Bandwidth 5-16

Triggering

1. Adjust Trigger Slope Balance 5-17

2. Check/Adjust Auto Trigger Centering and

TRIG'D LED Operation 5-17

3. Check Internal Triggering 5-18

4. Check External Triggering 5-18

External Z-Axis and Probe Adjust

1. Check EXT Z-AXIS Operation 5-20

2. Check PROBE ADJUST Operation 5-20

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