Tektronix 684A User Manual

TDS 684A, TDS 744A, & TDS 784A Service Manual

This section contains information needed to adjust the
 TDS 684A and 7XXA Digitizing Oscilloscopes.

The Adjustment Procedures are divided into six subsections:

H General information about adjusting the TDS 684A and 7XXA Digitizing

Oscilloscopes.

H A list of equipment required to perform the adjustments.

H The written procedures for installing and using both the TDS 684A Adjust-

ment Software and the TDS 700A Adjustment Software.

H The TDS 684A and the TDS 700A Adjustment Software (two disks) included

with this manual. The material found in the subsections listed above should
be read before using the adjustment software.

H A written procedure for manually adjusting the optional P6139A probe.

H A written procedure for manually adjusting the display assembly.

This procedure is used to return the digitizing oscilloscope to conformance with
its Warranted Characteristics as listed in Section 1, Specification. It can also be
used to optimize the performance of the oscilloscope.

As a general rule, these adjustments should be done every 2000 hours of
operation or once a year if the oscilloscope is used infrequently.

Before you do this procedure, you need to address the following requirements.

This procedure is only to be performed by trained service technicians.

This oscilloscope requires a 20 minute warm-up time in a 20

_ C to 30_ C

environment before it is adjusted. Adjustments done before the operating
temperature has stabilized may cause errors in performance.

Except when adjusting the display assembly, the cabinet is not removed. Instead,
you enable the internal adjustment constants of the oscilloscope to be written.