Tektronix SDA601, Руководство по обслуживанию

Страница: 73 / 132

Adjustment Procedures
SDA 601 Serial Digital Analyzer 4- 3
2. Press the TSG601
M
key to select the EQULIZR SDI (Equalizer SDI
Checkfield) signal.
3.
Switch the SDA601 On.
4. Perform the first, room temperature pass of the Calibrate SLM sequence.
a.
Select the SDA601 Utility/Diagnostics/Calibration/
Calibrate SLM
menu item with the following steps:
H
Hold the Lock Out key down, and press the ON button.
H
Press the Y key once, then press
ENTER
to access the Diagnostics
submenu.
H
Press the Y key four times, then press ENTER to access the Calibra-
tion submenu.
H
Press
ENTER
again to begin the SLM calibration sequence. The
display will resemble Figure 4--2 (note that the number on the
second line is unlikely to be 160).
Figure 4- 2: The First SLM Calibration Display
b. Verify that all switches on the cable simulator or attenuator are in the
OUT (0 meters) position, then press the SDA601
ENTER
button.
c. The SDA601 LCD will be blank for a few seconds. Wait until the
message “Set to 100 meter” appears on the top line of the LCD. Set the
cable simulator to 100 meters (if using an attenuator, set it to 10 dB),
then press the SDA601
ENTER
button.
d.
Wait until the message “Set to 200 meter” appears on the LCD. Set the
cable simulator to 200 meters (or attenuate by 20 dB), then press the
SDA601
ENTER
button.
e. Wait until the message “Set to 300 meter” appears on the LCD. Set the
cable simulator to 300 meters (set attenuator to 30 dB), then press the
SDA601
ENTER button.
f. Wait until the message “Press Enter to Save Cal Factors” appears on the
LCD. Press
ENTER
to complete the sequence.