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29
— Apply atime-marker signal with atime-interval of
.2 msec.
A triggered display should then be obtained.
— With "INTENS" (R6) of the basic oscilloscope,
adjust the intensity so, that at the initial part of
the oscillogram an extra intensified part is ob-
tained.
— It should be possible to shift this intensified part
with "DELAY-TIME MULTIPLIER".
— Set R4 to position "1.00".
— With "MIN. DELAY" (R132) adjust the delay time
to ".2 msec."; in this case, the start of the inten-
sified part should exactly coincide with the start of
the second period.
— Turn R4 to position "9.00".
— With "MAX. DELAY" (R129), adjust the delay
time to "1.8 msec." by making the start of the
intensified part coincide with the start of the 10th
period.
— Because the adjustments of "MIN. DELAY" and
"MAX. DELAY" influence each other, it is neces-
sary to repeat the adjustments several times.
For this, set R4 to position "1.00" again and ajust
R132 so, that the intensified parts coincides again
with the start of the second period.
Set SK7 to position "A DEL'D BY B".
Across the entire width of the screen, that part of
the signal that was indicated by the extra intensity,
should be visible.
In these positions of SK7, the "MIN. DELAY"
can be accurately determined, because the start of
the time-base line should coincide with the start
of the second period; if necessary, slightly readjust
R132.
Set R4 to position "9.00" and readjust "MAX.
DELAY" (R129) so, that the start of the time-
base line coincides with the start of the 10th
period.
— Repeat the adjustments of R132 and R129 until
the delay times are accurate in the positions "1.00"
and "9.00" of R4.
3. Delay-time multiplier 1:10
After adjustment of "MIN. DELAY" and "MAX.
DELAY" (point C2), check the intermediate positions
of R4.
— For this, set SK7 to position "A DELAYED BY
B" and always adjust R4 so, that the start of the
time-base line coincides with the start of the 3rd to
9th period.
— The indication of the counter knob should lie be-
tween the values mentioned in the next table.
Period
Indication counter knob
2nd
"1.00"
3 rd
"1.98" — "2.02"
4th
"2.98" — "3.02"
5th
"3.98" — "4.02"
6th
"4.98" — "5.02"
7th
"5.98" — "6.02"
8th
"6.98" — "7.02"
9th
"7.98" — "8.02"
10th
"9.00"
4. "Del'd Trigg." (SK6)
— Set the knobs to the positions indicated under C2.
— With SK6 in positions "STARTS A", the inten-
sified part should shift continuously across the
trace when varying the delay time by means of the
"DELAY-TIME MULTIPLIER" (R4).
— Set SK6 to position "SETS A READY".
— On the basic oscilloscope, set the "TRIGG. SOUR-
CE" to "INT." and "STAB." to "PRESET".
— On the basic oscilloscope, adjust "LEVEL" so that
the intensified part becomes visible.
— When the "DELAY TIME" is varied, the inten-
sified part should repeatedly jump one period.
5. Jitter
The jitter should amount to maximum .005
0 /0
of the
final value of the selected delay time.
With "DELAY TIME" (SK4) to position " 2 msec.",
this corresponds to 100 nsec.
— Set SK7 to position "A DEL'D BY B" and "TIME/
cm" on the basic oscilloscope to ".2 µsec./cm";
set the other knobs to the positions indicated in
section C2.
— The basic oscilloscope: check that knob "AMPL.
CAL." (SK13) is set to "OFF"; set "TRIGGER
SOURCE" (SK3) to position "EXT.".
— Apply a time marker signal with atime-interval
of 100 µsec. and adjust "DELAY TIME MUL-
TIPLIER" (R4) so that the leading edge of the
3rd pulse becomes visible. The idication of the
counterknob is then about 2.00.
— The maximum jitter may amount to (2.00 X
2 msec.): 20000 = 200 nsec.
In connection with the "TIME/cm" setting of
Time-base A, this corresponds to a maximum shift
of 1 cm on the screen.
D.
OUTPUT TERMINALS
— Adjust time-base B to its free-running position,
with a time co-efficient of ".1 msec./cm".
— On the output terminals "+
GATE" (BU2),
"TIME BASE" (BU3) and "DEL'D TRIGG."
BU4), synchronous voltages should be available,
as shown in Fig. 11 and Fig. 26.
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