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SERVICE AND MAINTENANCE
highest dial reading was 6.6 and occurred on the
1 to lOms RANGE, the error s p a n i s 6.6 -5.8 =0.8.
Set the RANGE switch to 10 to 100ms (the range
where the lowest dial reading was noted ) and set
the PULSE DURATION dial for a measured dura-
tion of 50ms. Loosen the hub set-screw (behind
the PULSE DURATION potentiometer) and posi-
tion the dial for a reading of 5
-
0.4 ~ 4 . 6 . Be
careful not to disturb the setting of the potentio-
meter itself; the measured duration must remain
50 ms. Tighten the setscrew. A dial reading of 5
now lies in the center of the error span (center
of error span
=
error span
+
2 or 0.8
+
2
=
0.4).
To be sure a PULSE DURATION dial reading of
5 lies in the center of the error span, s e t the
RANGE switch to 1 to l 0 m s (the range where the
highest dial reading was noted) and s e t the
PULSE DURATION dial for a measured duration
of 5 ms. If the dial has been positioned correctly
it will read 5
+
0.4
=
5.4.
P U L S E D U R A T I O N R A N G E accuracy.
Check or
adjust the PULSE DURATION RANGE accuracy a s
outlined in Table 5-3.
5.8.4 OUTPUT-PULSE CHARACTERISTICS.
Setup.
The characteristics and specifications for
both the
+
and the -OUTPUT PULSE waveforms are
the same except for polarity. Connect the appropriate
OUTPUT PULSE binding posts to the oscilloscope
via a terminated 50-ohm cable. Set the Type 1398-A
controls a s follows:
AF. . . . . . . . . . . . . . . . HIGH (fully clockwise
)
P R F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 MC
. . . . . . . . . . . . . . . .
PULSE DURATION dial.
5
. . . .
PULSE DURATION RANGE.
.O.1 to 1
ps
. . . . . . . . .
AMPLITUDE.
10 (fully clockwise
)
Amplitude.
Equal to or greater than 3volts, p-to-p.
R i s e time.
5ns or faster a s measured between the
10 and 90% points. Be sure any rise-time limitations of
the oscilloscope are taken into account (refer to para-
graph 3.5.3 for further rise-time details
).
90%
FALLTIME
I H D L C
5 - 3
P U L S E D U R A T I O N R A N G E A C C U R A C Y
PULSE DURATION
Maximum
R A N G E
Dial
--
P R F
Duration
Limits
l o o m s to I s
1
10 c / s
95 to 105 ms
(
52% of full scale )
10 to 100ms
1
30
C/S
9.5 to 10.5 ms
(
52% of full scale
)
1 to 10ms
1
300 c / s
0.95 t o 1.05ms
(rt2%
of full s c a l e )
1 O O p s t o l m s
1
3 kc/s
95 to 105 ps
(
f2% of full scale
)
10 t o 1 0 0 p s
1
30 kc/s
9.5 to 10.5
ps
( +2% of full scale )
1 to 1 0 p
1
300 kc/s
0.9 to 1.05
ps
(
+2% of full scale
)
0.1 to 1
ps
1
1.2 Mc/s
65
to 13511s ( f 3 5 n s )
l O O m s t o l s
5
10 d/s
475 to 525 ms
(
+5% of reading)
10 t o 100ms
5
10 c / s
47.5 to 52.5 ms
(
55% of reading)
1 to lOms
5
30
C/S
4.75 to 5.25 ms
(
f 5 % of reading)
1 0 0 p s t o l m s
5
300 c/s
475 to 525
ps
( + 5 % of reading
10 t o 1 0 0 p s
5
3 kc/s
47.5 t o 52.5
ps
(
+5% of reading )
1 t o lops
5
30 kc/s
4.75 to 5.25
ps
( + 5 % of reading)
0.1 to 1 JLS
5
300 kc/s
465 to 535 ns
(
135 ns
)
l O O m s t o l s
10
10 c / s
0.95 to 1.05
s
( 5 5 % of reading)
10 t o 100ms
10
10 c / s
95
to 105 ms (55% of reading)
1 to 10ms
10
30
C / S
9.5 to 10.5ms ( + 5 % of reading)
1 0 0 p s to l m s
10
300 c / s
0.95 to 1.05 ms
(
55% of reading
)
1 0 t o 1 0 0 p s
10
3 kc/s
95 to 105
ps
(
f 5% of reading )
1 to 1 0 p
10
30 kc/s
9.5 t o 10.5 ps
(
5%
of reading)
0.1 to 1ps
10
300 kc/s
Adjust C141 for duration of 1 ps
25
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