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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
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OSCILLATOR
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Figure 5-5. Sync Input Check
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5-5
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