Wavetek 188 - Page 9

fl simultaneous
6000
ana
500
output impedances
are
des»rea
*dc
FUNCTION GENERATOR
OR VOLTAGE SOURCE
(INITIALLY
OFF)
Figure
2*1.
First Setup
Amplitude
is normally variable
over 30 dB
for
each
oulpul
with
a 50 dB
amplitude range available
by
utilizing both outputs
1 Change value ol Ri 48 Irom 4990
to
6040
2
Remove Ri 49
The result is:
HI 10V
p-o
(500
source)
into 500
LO 10V
D-0
(6000
source) into
6000
Amplitude is variable
over
30 dB
Square wave rise
and tall time is less man 150
ns Any value greater
than 6000 may
also
be
substituted lor the value of
R148
for other
output
impedances
To
increase
the
range ot
the
variable amplitude
con-
tro*
In a
modified unit beyond
30 dB.
docroase the
value ot
R124 as
necessary Wavetorm quality
relative
to
the standard unit is not guaranteed below
-
30 dB
and above 20 kHz.
Table 2-1. Initial Checkout
Step
t
Control
POWER
Position/Operation
ON
Observation
1 10V
square wave on CHI and
*
IV on CH2
Return
to
CHI only
2
Dial Rotate m both
directions
Return
to
2
0.
Rotation
ccw
increases frequency of 'L
;
rotation cw decreases frequency
3 FREQUENCY
MULTIPLIER
Press each switch sequentially,
return
to X1K.
i .
- —
Froquoncy
increases m
decade steps,
left
to
right
4 AMPLITUDE Rotate ccw
Amplitude decreases
5
DC OFFSET Rotato cw Return to
OFF Output
immediately offset negative, then moves
positive OFF return it
to
o'rgmai level
6
AMPLITUDE Rotate cw
Square returns to original
amplitude
7 Function Generator
or DC Voltage
Source
Vary
input
dc
voltage: then discon-
nect
VCG
IN input
Frequency
increases with positive voltage and
decreases with negative voltage
8
FUNCTION
Press
A/- . Tj . “V
Observe
-V . 'L .
\
waveforms
9 MODE
Gate (CONT
depressed
TRIG/GATE
released)
A dc
level near zero volts (except
r
L
function)
10 MANUAL TRIGGER
Press and hold Continuous \ .
2-2