Signal Termination; Manual Function Generator Operation - Wavetek 188 Instruction Manual

Connector Impedance
5
FUNCTION
12
Set
to
desired
waveform.
500
OUT
(HI) 500
6
DC OFFSET
13
Set as desired.
Limit
wave-
500
OUT
(LO)
500 form amplitude
to
prevent
SYNC OUT
(TTL)
•
clipping
(see
figure
3-3).
TRIGIN
•
VCG
IN 2kO
7
AMPLITUDE
14 Set
for
desired amplitude
SWPOUT
6000
GCVOUT
6000
•The TTl
OUT
connector
is
dode
protected ano can
drive up
to
20
Transistor-Transistor-Logic (TTL)
loads
(low
level
between OV and 0
4V.
and
high
level
bet-
ween
2.4 V
and
5V)
It
shoo
Id not
be connected
to
resistive
load
less
than 600Q
The TRIG
IN connector
accepts TTL
logic levels,
is
diode protected, and
re-
quires 500
j*A
dnve
from a n.gh
level output
RECEIVING
MOOEl
IBS
INSTRUMENT
OUTPUT
IMPEDANCE
ROM
OR
EQUIVALENT
\
"
LOAD_
EFFECTIVE
CIRCUIT
RESISTANCE
OUTPUT
AMPl IPIFR
,
r
<
(SIGNAL
LOAD!
P50U
muruiritn
f
V
1
,
Figure
3-2.
Signal Termination
3.2.2
Manual
Function Generator Operation
For basic operation,
select
the
waveform
frequency
and
amplitude The
following
steps
demonstrate
manual
control
o»
the (unction generator (Bold
numbers
are
keyed
to figure
3-1.)
Step Control/Connector
Setting
3.2.3
Voltage
Controlled
Function Generator
Operation
Operation as a
voltage controlled (unction
generator
(VCG)
is
as (or a
manually
controlled (unction
generator, only the frequency
within
a particular range
»s
add'tionaily controlled
by an
external voltago
(
± 4V
excursions) mjocted
at
the
VCG
IN connector. Per-
form
the steps given
in
paragraph
3.2
2.
only
set
tho
frequency
dial
to
determine a reference
from which
the
frequency
is
to
be
voltage controlled
HE
0
DC
OFFSET
POSITIVE
NEGATIVE
OC
OFFSET
DC OFFSET
:.
W"
T
AT
EXCESSIVE
EXCESSIVE
POSITIVE
NEGATIVE
OFFSET
OR OFFSET OR
LOADING
LOAOING
1
500
OUT
15
16
2
FREQUENCY
MULTIPLIER
4
3
Frequency
Dial
1
4
SWEEP
S
CONT
5
Connect
circuit
to either
output (refer
to
para-
graph 3 21)
Set
to
desired
range
of
fre-
quency
Set
to
desired frequency
within the
range
Extended
Figure
3-3.
DC OFFSET
Control
1
For frequency
control
with
positive
dc
inputs
at
VCG
IN. set the
dial for
a lower frequency
limit
2
For frequency
control with negative
dc
inputs
at
VCG
IN.
set the
dial for
an upper frequency
limit.
3 For modulation with
an ac
input
at
VCG
IN. set
the
dial at the
desired center frequency. Do
not