Model209A
Section V
5-13.
RISE
TIME
CHECK
(SQUARE
WAVE).
a.
With the square
wave
output still connected
to the oscilloscope with the 10: I divider
probe, set the Model 209A frequency to 2
MHz
and the oscilloscope sweep time to 50
nsec/cm.
b. Connect the Model 209A
SYNC
output to
the
AC
Voltmeter, using a low capacitance
10:1 divider probe.
c.
The
SYNC
output should be at least 1.7 V
rms
at 50 kHz, at least
0.1
Vat
2
MHz.
5-16.
SYNC
INPUT
CHECK.
b. Observe the rise and fall skirts
of
the
waveform. The
10%
to
90%
amplitude
points
of
the waveform should be no wider
than
I em (50 nsec).
a.
Connect the Test Oscillator to the
AC
Voltmeter and adjust the controls for 5 V
rms at 20 kHz.
5-14.
SYMMETRY
CHECK
(SQUARE
WAVE).
a.
With the square
wave
output still connected
to the oscilloscope with the 10:1 divider
probe, set the Model 209A frequency
to
200
kHz and the oscilloscope sweep time
to
0.5
usee/em.
b. Connect the Model 209A sine
wave
output
to the Electronic Counter and adjust
controls for a frequency
of
20 kHz.
c.
Without changing the controls set in steps a
and b, connect the equipment
as
shown in
Figure 5-5.
b.
While
observing the waveform on the
oscilloscope, adjust the Model 209A
frequency dial for exactly 1 cycle for 10
centimeters.
c.
The waveform crossover point should be
within +/-0.5 em
of
the center
of
the
oscilloscope graticule.
d. Adjust the oscilloscope to synchronize
externally on the Test Oscillator signal.
e.
Rotate the Test Oscillator dial above and
below 20 kHz while watching the indication
on the oscilloscope. When the waveform
begins to lose synchronization, note the
frequency indication on the Electronic
Counter.
5-15.
SYNC
OUTPUT
CHECK.
a.
Connect a 100 pF capacitor across the
Model 209A
SYNC
output.
f.
The waveform should remain synchronized
to
less
than 18.6 kHz and greater than 21.4
kHz, indicating a sync range
of
+/-7%
at 5 V
rms.
TEST
OSCILLATOR
hp651B
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(I)
® 0 0
@<f
ELECTRONIC COUNTER
hp5233L
hp209A
OSCILLATOR
T
hpl402A
hpl420A
l
OSC
ILLOSCOPE
hpl40A
o©·[~r0
~
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o . • 0
[QJ©~0
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00
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o
.,
.
Figure 5-5. Sync Input Check
www,HPARCHIVEcom
5-5
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