SRS Labs SR510 - Manual (Page 18)

14
OUTPUT can be set to three amplitudes, 1 V, 100
mV, and 10 mV (rms) using the amplitude switch.
The output impedance is 600
Ω
. 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 k
Ω
. 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 is now 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 K
Ω
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.