132
G E N E R A T O R
Figure 2-l. Operating Controls, Front Panel
10.
11.
12.
FM - Depressing this push button along with
the FUNC push button (7) allows the selected
signal, either
A
,
,
or
wave, to be
pseudo-randomly frequency modulated, or jit-
tered. The modulating signal is provided by
pseudo-random analog noise, and the S/N -
N/S (dB) controls frequency deviation. The
bandwidth of the modulating signal is controlled
by the NOISE FREQ HZ selector (15) and
vernier (16).
OUT - Provides the selected generator out-
put function. The generator may operate into an
open circuit providing 20 V peak to peak maxi-
mum, or into a
load providing a
10
V peak
to peak output.
OUTPUT ATTEN (dB) - Attenuates the output
(both signal and noise) from 0 dB to -60 dB in
six calibrated 10 dB steps according to the fol-
lowing table:
Step
Attenuator
Position
Output peak to peak into
Load
Maximum
Minimum
Vernier
Vernier*
fully cw
0 dB
10V
I V
- 1 0 dB
3 V
0.3 v
- 2 0 dB
I V
0.1 v
- 3 0 dB
0.3 v
0.03 v
- 4 0 dB
0.1 v
0.01 v
- 5 0 dB
0.03 v
0.003 v
- 6 0 dB
0.01 v
0.001 v
*
The values in this table are approximate. The OUT-
PUT VERNIER (dB) (6) will reduce the output
approximately 20 dB in all cases, as shown.
13.
S/N -
N/S (dB) - I n the S/N mode, this control
attenuatesthe analog noise from
0 to
-50 dB in
five calibrated 10 dB steps. The selectable signal
5