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the REF OUTPUT on the rear panel to the REF
INPUT on the front panel. The REF OUTPUT is a
1 Vrms sine wave. The SINE OUTPUT may be
used as the stimulus to the experiment. The SINE
OUTPUT can be set to three amplitudes, 1 V, 100
mV, and 10 mV (rms) using the amplitude switch.
The output impedance is 600Ω. The AMP CAL
screw adjusts the amplitude.
The oscillator frequency is controlled by the VCO
INPUT voltage. A voltage from 0V to 10V will
adjust the frequency according to the VCO
RANGE selected. Three ranges are available, 1
Hz/V, 100 Hz/V, and 10 KHz/V. The input
impedance is 10 kΩ. The FREQUENCY CAL
screw adjusts the frequency.
There are four ways to set the frequency:
1) Connect X5 or X6 (D/A outputs) to the VCO
INPUT. The frequency can now be set from the
front panel by setting the DISPLAY to D/A and
adjusting X5 or X6. The frequency is also
controllable via the computer interfaces by
programming X5 or X6.
2) If the VCO INPUT is left open, then the
oscillator will run at the top of its range (i.e. 10 Hz,
1 KHz, or 100 KHz).
3) A 10 KΩ potentiometer may be connected from
the VCO INPUT to ground. This pot will then set
the frequency.
4) Connect the VCO INPUT to an external voltage
source which can provide 0 to 10V.
In all four cases, if the REF OUTPUT is connected
to the REFERENCE INPUT on the front panel, the
frequency may be read on the front panel
REFERENCE DIGITAL DISPLAY or via the
computer interfaces.