6.
b. For increasing frequency sweep with positive
dc input, set dial to lower frequency limit.
c. For decreasing frequency sweep with nega-
tive dc input, set dial to upper frequency
limit.
To sweep the audio range from 20 Hz to 20 kHz,
set the controls to 20 Hz as follows:
a. Set the main dial to 0.02.
b. Set the frequency vernier to the full ccw
position.
c. Introduce a 0 to +5 V ramp into the VCG
inputconnector.
The maximum frequency which may be obtained, when
using the VCG input, is the range multiplier times the
value at the top of the dial (2.0). The minimum fre-
quency is the range multiplier times the value at the
bottom of the dial (0.002 - frequency vernier must
be in ccw position). Verify this using the nomograph
in Figure 2-3.
MAIN DIAL
VCG IN
OUT
SETTING
VOLTAGE
FREQUENCY
.02
.2
.4
.6
.8
1.6
1.8
2.0
A
B
C
Figure 2-3
-
VCG Voltage-to-Frequency Nomograph
In example 1, the dial is set at 1.0 and 0 voltage is
applied to the VCG input. Extend a straight line from
1.0 (dial setting) through 0 voltage (VCG voltage) and
obtain a dial frequency of 1.0. For the total output
frequency, multiply the range by 1 with the same dial
setting. Example 2 shows the results of using a ramp
from -1 volt to +2.5 volts for the VCG voltage. This
results in a swept output from 0.6 to 2.0 on the dial.
Remember to multiply the dial times the range.
Operation as a Calibrated Signal-to-Noise Source
1.
Select the desired signal waveform by setting
f u n c t i o n s e l e c t o r t o
,
, or
.
2.
Set frequency dial and FREQ HZ range multi-
plier for desired signal output frequency.
3.
Depress MODE - S/N push button.
4.
Select noise bandwidth by setting NOISE FREQ
HZ control to desired range and fine adjusting
bandwidth by turning the noise frequency Hz
vernier control.
5.
Select desired SEQUENCE LENGTH by de-
pressing appropriate push button.
6.
Select signal-to-noise ratio by setting S/N - N/S
(dB) control to appropriate attenuation position
and fine adjusting attenuation to desired value
with S/N - N/S vernier control.
7.
Select total output amplitude by setting OUT-
PUT ATTEN (dB) control to appropriate atten-
uation position and fine adjusting signal to de-
sired amplitude with OUTPUT VERNIER (dB)
control.
Operation as a Calibrated Noise-to-Signal Source
1.
2.
3.
4.
5.
6.
7.
Select the desired signal waveform by setting
f u n c t i o n s e l e c t o r t o
,
, or
,
Set frequency dial and FREQ HZ range multi-
plier for desired signal output frequency.
Depress MODE - N/S push button.
Select noise bandwidth by setting NOISE FREQ
HZ control to desired range and fine adjusting
bandwidth by turning the noise frequency Hz
vernier control.
Select desired SEQUENCE LENGTH by depres-
sing appropriate push button.
Select noise-to-signal ratio by setting S/N - N/S
(dB) control to appropriate attenuation position
and fine adjusting attenuation to desired value
with S/N - N/S vernier control.
Select total output amplitude by setting OUT-
PUT ATTEN (dB) control to appropriate atten-
uation position and fine adjusting signal to de-