Adjustment Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
5-3
complete adjustment, do all adjustments in the software, completely and in
sequence, and then do the written probe adjustment procedure.
Throughout this chapter, “complete adjustment” is used as just defined. Note that
the procedure Monitor Assembly Adjustment (page 5--21) is not requiredtodoa
complete adjustment.
The adjustment software contains a sequence of individual adjustments. The list
of those adjustments follows:
H Signal Path Compensation
H Voltage Reference Adjustment
H High Frequency Response Adjustment (TDS 430A and TDS 460A only)
H Low Frequency Response Adjustment
H Trigger Skew Adjustment
All these software-based adjustments are made internally by the adjustment
software, and all adjustments are done without removal of the oscilloscope
cabinet.
The adjustment software allows you to make individual adjustments. However,
usually all adjustments are made unless you are adjusting circuits in the course
of troubleshooting the oscilloscope. Read the information under Complete
Adjustment,page5--2,Adjustment After Repair, page 5--3, and Adjustment
Dependencies, page 5--4, before doing an individual adjustment.
After the removal and replacement of a module due to electrical failure, you
either must do a complete adjustment or no adjustment is required, depending on
the module replaced. See Table 5--1.
Table 5- 1: Adjustments Required for Module Replaced
Module Replaced Adjustment Required
Acquisition Board Complete Adjustment
Attenuator Board Complete Adjustment
Front Panel Assembly None Required
Low Voltage Power Supply Complete Adjustment
CPU Assembly Complete Adjustment
DSP Assembly None Required
Display Assembly None Required
Individual A djustments
Partial Adjustment
Adjustment After Repair
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