Tektronix 070-8462-03, Инструкция по эксплуатации

Страница: 49 / 271

Operating Basics
2–12
1735 HD High Definition Waveform Monitor
The scale on the right side of the graticule is used for measuring signal amplitude
as a percentage of a 1 Volt signal, and extends from 0% to 115%.
The horizontal reference line, which is divided into 12.4 divisions, is also
referred to as the baseline, 0% line, 0 mV, zero line, blanking level, and black
level.
The time period between major graticule divisions is dependent upon the
1735 HD sweep rate. For example, two-line sweep for 525/60 has a rate of
10
m
s/division, while one line is 5
m
s/division and three-line is 15
m
s/division.
Field rate sweeps do not assign an exact period of time to the graticule divisions.
Front Panel Diagnostics
The 1735 HD has several diagnostic routines that can be run to assist in locating
operating system failures. Key to the diagnostics is the microcontroller. It tests
the digital interfaces (front-panel switches, auxiliary interface, Non-Volatile
Random Access Memory, and the front-panel light drivers), along with the
Digital-to-Analog Converter.
To enable the diagnostic tests, first push and hold the MENU button to access the
main Menu (Figure 2–2). Use the DOWN button to move the cursor to TEST,
then push the MENU button again. The Test Menu will appear, as shown in
Figure 2–5. Use the UP / DOWN buttons to move the cursor to the desired test,
then push the MENU button to begin the test.
TEST MENU
ąEXIT
ąMEMORY TEST
ąDAC TEST
ąLED TEST
ąKEY TEST
ąCOMM TEST
ąSET DEFAULT NVRAM
USE UP/DOWN TO MOVE CURSOR,
THEN PUSH FIELD.
>
Figure 2–5: 1735 HD Test menu, for selection of diagnostic routines
Horizontal Scale