Turn-On Display - HP 3585A Service Manual

Installation and Interfacing
h. Adjust the front-panel INTENSITY control to obtain the desired intensity on the CRT
screen. Adjust the FOCUS and ASTIG controls as follows:
1 . Set the FOCUS control to midrange.
2. Adjust the ASTIG (Astigmatism) control for the sharpest trace possible.
3 . Adjust the FOCUS control for the sharpest and clearest trace possible.
4. Repeat Steps 2 and 3 until optimum adjustment is obtained. If, after several itera­
tions a sharp, clear presentation cannot be obtained, internal adjustments are pro­
bably required. These adjustments must be performed by a qualified service techni­
cian.
i. The CRT display should now appear as shown in Figure 2-4.
Verify that the Zero Response is present and is aligned with the first vertical line on the left­
hand side of the CRT graticule.
j . Press the front-panel
Autom a tic Calibration. The "CALIBRATING" message will appear on the CRT screen.)
If the beeper sounds and/or a Calibration Error Code (e.g. , "CALIBRATION ERROR
03 ") appears on the CRT screen, the instrument is either defective or in need of adjustment.
Turn the instrument off and see the Fault Isolation information in Volume Two or the
Preliminary Troubleshooting procedures in Volume Three.
k . The 3585A's specifications are met after a 20-minute warmup at the ambient operating
temperature.
When the internal Oven Re ference is enabled (about ten minutes
after turn on), the beeper will sound and the "LOCAL OSC.
UNLOCKED " message will momentarily appear on the CR T
screen.
2-8
REF -25. 0 dBm MARKER 20 000 000. 0 Hz
10 dB/DIV RANGE -25 0 dB..
- - - - - - - - - - - - - - - - - - - - - � - - - -
CENTER 20 000 000. 0 Hz
RBW 30 KHz VBW 30 KHz
Figure 2·4. Turn·On Display
� � t; �
key. (This will force an internal verification test and
NOTE
-97.
1 dB ..
- - - - - - - - - - - - - - - - -
SPAN 4 0 000 000. 0 Hz
ST 2 SEC
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Model 3585A