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Model 211B
50N LOAD
2B
TRIG. 500
101204
lOl20A
Figure 5-2.
Dial Accuracy Check
c. Set Electronic Counter controls as follows:
SIGNAL INPUT...........+-- AC
SENSITIVITY. .......022e5 00s 0.1 V
TIME
BASE
........ d e tile esbeereee O.1y sec.
FUNCTION,.......22e
eevee 1 Period Average
d. Electronic Counter should read 1 000 000s
+50 000us
e, Set FREQUENCY
Dial to 5, Electronic Counter
should read
200 000us
+10 000us
f. Set FREQUENCY
Dial to 10, Electronic Counter
should read
100 000us
+5 000us
g. Set MULTIPLIER
to 10 and FREQUENCY
Dial
to 1, Electronic Counter should read
100 000us
+5 000us
h. Repeat steps
e and
f with MULTIPLIER
at
10,Electronic Counter should read 20 000ps
+1000us
and 10 000us
¢500us respectively.
i. Set MULTIPLIER
to 100 and FREQUENCY
Dial
to 1, Electronic Counter should read 10 000us
+500ys
j. Repeat steps
e and
f with MULTIPLIER
at
100, Electronic Counter should read 2 000us
+100us
+5008 respectively.
k. Set
Electronic
Counter
FUNCTION
to
FREQUENCY
and
TIMEBASE
to
1 sec.
1, Complete check by setting Square Wave Gen-
erator MULTIPLIER
switch and FREQUENCY
Dial
as shown in Table 5-2 columns one and two.
The
Electronic Counter reading should be as shown in
column three.
Section
V
Paragraphs 5-10
to 5-12
Table 5-2.
Dial Accuracy
ULTIPLIER|FREQUENCY
COUNTER
DIAL
READING
1000Hz
5000Hz
10KHz
10KHz
50KHz
+50Hz
+250Hz
+500Hz
+500Hz
+2. 5KHz
t5KHz
t5KHz
+25KHz
+50KHz
t50KHz
+250KHz
t500KHz
100KHz
100KHz
500KHz
1000KHz
1000KHz
5000KHz
10000KHz
5-10.
SYMMETRY
CONTROL
CHECK
a.
With Model 211B connected as shown in
Figure 5-2, set the controls as follows:
MULTIPLIER............665
10K
FREQUENCY
Dial............
1
SYMMETRY ...........0000%
CW
AMPLITUDE
(v across 502). . 5
VERNIER.......--.cc
eee eees CW
TIME SCALE..........00085
20us/cm
TIME
SCALE
MAGNIFIER...
.X1
TRIGGER
SOURCE........... internal
SWEEP
SELECTOR.......... main sweep
CHANNEL
SELECTOR......
. channel A
SENSITIVITY..............
2 V/cm de coupled
POLARITY...........00.005
positive
c. Adjust oscilloscope for a stable display
d. The "on time" should be greater than 75% of
the period.
e. Turn the SYMMETRY
control CCW
and the
"on time"should be less than 25% of the period.
5-11.
OUTPUT PULSE CHARACTERISTICS.
5-12. Refer
to Figure
5-1
for definition
of pulse
characteristics. Follow these procedures in sequence
since each paragraph continues the same equipment
connections
and front panel settings
as in the pro-
ceeding paragraph.
Any required changes in control
settings
are
specified
in the procedures.
All mea-
surements are made with a 10:1 divider.
5-3
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