HP 3720A - 4-12 SYSTEM TROUBLESHOOTING CONTROLS SET-UP

Section IV
4-12 SYSTEM TROUBLESHOOTING CONTROLS SET-UP
CAUTION
A high intensity CRT display over an ex-
tended period
of time may cause burn damage
to the storage mesh or phosphors
of the
3720A
CRT.
4- 13 Procedure
1.
Set controls.
Set 3720A controls:
SCALE FACTOR
....
INTENSITY ........
PERSISTENCE ......
STORAGETIME ....
INPUT ..............
DATA ..............
VERTICALGAIN _. ._
HORIZONTAL GAIN ..
CALIBRATION ......
RECORD .. _. _. ._ ..
INTERPOLATION ._ ._
.......... ..VERT
........ fully ccw
............ MIN
............ MAX
.............. ..l
.............. ..l
............ MIN
............ MIN
............ OFF
.......... SCAN
.. ccw (not AUTO)
Set 3721A controls:
FUNCTION ...... AUTOCORRELATION A
A INPUT RMS VOLTS .......... .4 - 1
AC/DC (A) ...................... DC
DITHER
........................ OFF
AVERAGING
............ SUMMATION
NUMBER OF SAMPLES N
...... ..l x 1024
TIMESCALE
.................. ..333pS
DISPLAY GAIN
.................. MIN
DI SPLAY/CA L
.............. DISPLAY
2.
3.
Switch on 3721A and 3720A and allow 20 minutes warm-up ti.me.
Press 3721 A RESET, then RUN.
4.
Adjust INTENSITY controls on 3721A and 3720A to obtain normal brightness traces on the respective
CRT’s. Both instruments should display
a horizontal trace positioned along the major axis of the
graticule.
5.
Check the 3721A/3720A System for faults by following Flow A, B, C and/or D, as appropriate.
4-3
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