Tektronix TDS7054, Service Manual

Page: 145 / 254

TDS7104 & TDS7054 Service Manual
5- 1
Adjustment Procedures
This chapter contains an automatic adjustment procedure for your oscilloscope.
The purpose of this procedure is to return the oscilloscope to conformance to its
specifications.
The voltage and timing references inside the oscilloscope are very stable
over time and should not need routine adjustment. Before performing the
procedures in this chapter, first verify that the oscilloscope does not meet
specifications. Refer to
Performance Tests on page 4--17 for a procedure to verify
the specifications.
If periodic calibration is one of your requirements, a general rule is to verify
performance and make adjustments (only if needed) every 2000 hours of
operation or once a year if the oscilloscope is used infrequently.
The oscilloscope must be adjusted in a 20
°
C to 30
°
C ambient temperature
environment. The oscilloscope and signal source must warm up at least 20
minutes in this environment before you begin the adjustment procedure.
Some adjustments are dependent upon others. The automatic adjustment
procedure performs the adjustments in an appropriate sequence to eliminate
dependency problems. Always execute the complete automatic adjustment
procedure. The total time to execute the procedure is approximately 30 minutes
(depending somewhat on the processor speed of the controller and the type of
GPIB controller — USB is much slower).
After removal and replacement of a module due to electrical failure, you must
either perform the adjustment procedure or not, depending on the module
replaced. See Table 5--1.
Table 5- 1: Adjustments required for module
replaced
Module replaced Adjustment required
Front panel assembly No
Acquisition board Yes
Processor board No
NLX processor assembly No
Display panel or display
system No
Adjustment Interval
Adjustment Environment
Adjustment Dependencies
Adjustment After Repair