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Mode1209A
3·1.
INTRODUCTION.
SECTION III
OPERATING INSTRUCTIONS
3-8. BALANCE.
Section III
3-2. This section contains information as an aid to
operating the Model 209A. Included are control and
connector descriptions (Figure 3-1), and some special
operating considerations.
3-3.
TURN ON PROCEDURE.
34. To turn on the Model 209A, proceed as follows:
a. Set the two-position voltage selector switch
on the rear panel to the value of available
line voltage.
b. Connect the AC power cord to line voltage.
c. Switch the RANGE switch from OFF to the
desired frequency range.
d. Select the desired frequency and voltage
output
with
the
frequency
dial
and
amplitude controls respectively.
3-5.
OPERATING CONSIDERATIONS.
3-6. FLOATING OUTPUT.
WHEN THE GROUND STRAP ON
THE
REAR
PANEL
IS
CONNECTED, INPUT GROUND
IS
AT
EARTH
GROUND
POTENTIAL.
3-7. When the ground strap on the rear of the Model
209A is disconnected, the chassis is isolated from
power ground. The outputs may then be connected
to any point with a dc potential of not more than
+/-500 volts. If a dc voltage up to +/-500 volts is
connected between the ground connectors on the rear
panels, the oscillator output is dc offset by that
amount.
3-9. With the chassis isolated from the cabinet, the
sine wave output will be balanced to greater than 40
dB at frequencies below 20 kHz.
If
the square wave
output is being used simultaneously with the black
terminal connected to ground, the sine wave output
will no longer be balanced.
3-10. SYNCHRONIZATION.
3-11. The Model 209A is equipped with a SYNC
terminal that provides a sync output signal or accepts
a synchronizing input signal from an external source.
The sync output signal is a 1.7 volt rms sine wave in
phase with the oscillator output. The external sync
signal can be any periodic waveform of sufficient
amplitude to maintain sync. For an external sync
signal with an amplitude of 5 volts rms, the oscillator
will remain synchronized at frequencies of +/-7% of
the set frequency.
3-12. The Model 209A can be synchronized to any
significant harmonic of an external signal. However, if
a harmonic or non-sinusoidal waveform is used to
synchronize the Model 209A, some portion of the
external sync signal will be on the output. This small
signal will appear as distortion. The amount of this
apparent distortion will be directly proportional to
the amplitude of the sync signal. For a non-sinusoidal
sync input of 2 volts peak-to-peak, the distortion will
be down about 45 dB for frequencies which are
normally down -60 dB.
3-13. LOW DISTORTION.
3-14. At frequencies below 100 Hz, distortion can be
reduced by switching the NORM/LOW DIST switch
on the rear panel to LOW DIST. In the LOW DIST
mode the Model 209A will have a longer settling time
when changing frequencies. To avoid this, set the
desired frequency before switching to LOW DIST.
3-1
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