Sweep Generator Operation; Generator Operation; Waveforms - Wavetek 188 Instruction Manual

the
max i m u m
exceed
frequency range.
o o p
3-4 g ra
Figure
n
i s a m
voltage effects. Example
put, mode) or i�
frequency
dete rmined by the mai n dial setting,
ple. 2 .04
(linear (logarithmic
2 that
output
Example shows
is inc reased.
frequency
w t a VCG input.
i h negative
that
dec reased. (Note the
multiplied
col umn value must be
to
multiplier give the actual
MAIN DIAL YCG I N
SETT I NG VOLTAGE
LIN LOG
4 4 - 4
- 3
- 2
3 .4
- 1
- -
.04:---:- - - - - -
, -
2 0
"
"
....
,
...
.... .... ...
.004
2.0 '"
.004 .0004 4.0
MAI N DIAL VCG I N
SETT I N Q VOLTAQE
LOG
LIN
4 4 - 4
- 3
.4 - 2
3
- 1
2 .04 0
+ 1 .0
1 .004 + 2.0
+ 3.0
.004 .0004 + 4.0
Figure 3-4. VeG Voltag.to· Frequency Nomograph
NO TE
Nonlinear operation may result when the
VCG input voltage is excessive; that is,
3-4
d range of
ial the selected
and
h with of
examples dial
1
shows that with OV VCG in­
mod e )
exam­
i n this
VCG nput
with a positive
i
3 shows that qu cy
Example
n
fr e e
output
Output F requency Facto r
a frequency r g
by a n
output
frequency. )
OUTPUT
FREQUENCY
FACTOR
LIN LOG
.0004 .004
1
'EXAM PLE 1
2.0
- - - - - - - - .04
OUTPUT
FREQU ENCY
FACTOR
LOG
LI N
.0004 .004
.04 2.0
4
3.0
4.0
by
Scans
attempted
when the
exceeds the range limits.
four times the
(logarithmic)
lower limit is 111000th
(
The up to 1 000: 1
li
, range results of the
gene rator frequencies
sweep
from
is
With frequency dial set
and
nector. the
between (lin) 4V
-
1 000: 1
1 0,000 : 1
o r
e
the n set to .004
dial
c r between OV and
u s i o
s
up to 1 000 : 1
(linear)
wit h i n the set frequency
3.2.4

Sweep Generator Operation

w
as e
Operation a s
controlled generator
generator can be repetitively swept
selected frequencies either
sweep
and
a
selected
ramp
main gene
STOP
FREQ
LEVEL
GCV
OUT
STAAT
FREQ
LEVEL
500
ov -I
OUT
STAAT F R EQ
DIAL SETT I NG
Figure 3-5. Effect of Swee p Time and Width
on Output Frequency
3.2.5

Waveforms

The
following steps describe
setup.
ArtekMedia
2011
= >
generator frequenc y The
multiplier upper limit is
(linear) setting, and the
1110, 000
or
of the upper limit.
n ) (logarithmic)
r 1 0, 000:1
ea or
available in
4V at the VCG
a
excursion
4.0.
excu rsions
to
OV at VCG IN the
provide
(logarithmic),
(log) frequency sweep. With
.0004
or
{ l i nea r}
or
4V the VCG I N provide
+
at
1 0,000 : 1
{logarithmic sweep
range.
is si m i lar to
e
p generator
tw
operation except the
n r y
b e
li l of
a or logarithmicly at
e
relationship
rate. The
is shown in
rator- figure
TI M E
I
I
t
sweep
t e
operation
h
VCG
o
each
­
I N c n
up to
ex­
manuall y
n
main
two
ee
internal
3-5.