Tektronix TDS 420A, Service Manual, Page: 128 / 288

Adjustment Procedures
5- 2
TDS 420A, TDS 430A & TDS 460A Service Manual
The following computer and peripherals are required to adjust this oscilloscope;
the adjustment software does not run on systems that do not meet
all require-
ments listed:
An IBM
R
PC
t
compatible computer equipped as follows:
H
Eight MHz clock speed or faster
H
MSDOS
R
3.2 or higher
H
640K Resident RAM, with 580K available
H
A hard drive
H
A high-density floppy drive: 3.5 inch (1.44 M) or 5.25 inch (1.2 M)
H
A GPIB board — National Instruments
R
GPIB-PCII, GPIB-PCIIA or
GPIB-PCII/IIA. (A PC-GPIB package that includes the PCII/IIA is
available — Tektronix part number S3FG210)
H
Suitable keyboard and monitor
Installation of a math coprocessor in your system is strongly recommended to
decrease the time required to adjust the oscilloscope.
The equipment list on page 5--5 lists all test equipment required to adjust this
oscilloscope.
Usage
The following topics cover what is required of you when adjusting the oscillo-
scope and what is done by the software. Also, the performance of individual
adjustments is discussed.
When using the adjustment software, you are not required to manually adjust any
circuits. The software adjusts the circuits using external standards you provide in
response to prompts on the computer screen. Your role is to provide those test
signals and to prompt the computer to continue.
Since the probe and monitor-assembly adjustments require manual adjustment of
circuit components, they are not part of the adjustment software. Written
procedures for these adjustments begin on page 5--10.
A complete adjustment is the performance of all adjustments contained in the
Adjustment Software plus the probe adjustment on page 5--10. Therefore, to do a
System
Optional Peripherals
Test Equipment
Performing the
Adjustments
Complete Adjustment