Performance Check—455/A2/B2
18. 50 MHz INTERNAL TRIGGERING
a. Set: HORIZ DISPLAY A
A and B SOURCE NORM
b. Set generator frequency to 50 MHz and
adjust output amplitude for 1.5 division display.
c. CHECK—Stable display can be obtained in both +
and — positions of A SLOPE switch for these modes:
A SOURCE A COUPLING
NORM AC, LFREJ, DC
CH 1 DC
CH 2 DC
d. CHECK—No stable display can be obtained with A
COUPLING switch in HF REJ position.
e. Set HORIZ DISPLAY to B DLY'D.
f. CHECK—Stable display can be obtained in both +
and — positions of B SLOPE switch for these modes:
B SOURCE
B COUPLING
NORM
AC, LF REJ, DC
CH 1
DC
CH 2
DC
g. CHECK—No stable display can be obtained with B
COUPLING in HF REJ position.
L Z AXIS INPUT
a. Set: A and B TIME/DIV
10 fis
HORIZ DISPLAY A
A and B COUPLING
AC
A SOURCE
EXT
CH 1 VOLTS/DIV .1 V
b. Set generator frequency to 50 kHz and adjust output
amplitude for 5 division display.
c. Disconnect 50 SI cable and termination from dual
input cable connected to CH 1 and CH 2 inputs and
connect to EXT Z AXIS connector at rear of instrument.
d. CHECK—Trace modulation is noticeable at normal
intensity. (Adjust A LEVEL control as required to
obtain stable display).
20. TRIGGER LEVEL RANGES
a. Remove cable from Z AXIS INPUT connector and
connect (without 50 SI termination) to dual-input cable
at vertical module.
b. Set: A and B SLOPE OUT: +
CH 1 VOLTS/DIV 1 V
A and B SOURCE EXT
c. Set generator output to 50 kHz and adjust amplitude
for 4 division display.
d. CHECK—Display is triggered along positive-going
slope of waveform as A LEVEL control is rotated and
is not triggered (free-runs) at either extreme of A LEVEL
rotation.
e. Set A SLOPE to IN: - .
f. CHECK—Display is triggered along negative-going
slope of waveform as A LEVEL control is rotated and is
not triggered at either extreme of A LEVEL rotation.
g. Set HORIZ DISPLAY to B DLY'D.
h. CHECK—Display is triggered along positive-going
slope of waveform as B LEVEL control is rotated and is
not triggered (not visible) at either extreme of B LEVEL
rotation.
i. Set B SLOPE to IN: - .
REV FEB 1983
3-9
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