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MODEL
182A
• •
TRIG
IN
TTLOUT
OSCILLOSCOPE
500
OUT
(HI)
CH1
CH2
H
SYNC
•
TTL
OUT
FUNCTION
GENERATOR
Figure
2-2.
Second
Setup
2.4
CHANGING THE OUTPUT IMPEDANCE
The
output
impedance
is
normally:
HI
10V
p-p
(500 source)
into
508.
LO
1V
p-p
(500 source)
into
500.
Amplitude
is
normally
variable
over
20
dB
with
-
50
dB
lowest possible amplitude.
If
simultaneous
600G
and
500
output
impedances
are
desired:
1
Change
value
of
R1
48 from
4990
to
6040.
2.
Remove
R1
49.
The
result
is:
HI
10V
p-p
(500 source)
into
500.
LO
10V
p-p
(6000
source)
into
6000.
Amplitude
is
variable
over
30
dB
with
-
30
dB
lowest
possible amplitude.
Square
wave
rise
and
fall
time
is
less
than
150
ns.
Any
value greater than
6000
may
also
be
substituted
for
the
value
of
R1
48
for
other
out-
put
impedances.
To
increase
the
range
of
the variable
amplitude con-
trol
in
a modified
unit
beyond 30
dB,
decrease
the
value
of
R124
as
necessary.
Waveform
quality
relative to
the
standard
unit
is
not
guaranteed below
-
30
dB
and above 20
kHz.
Table
2-1.
Initial
Checkout
Step
4
5
6
7
8
9
10
Control
Position/Operation
POWER
Dial
FREQUENCY
MULTIPLIER
AMPLITUDE
DC OFFSET
AMPLITUDE
Function
Generator
or
DC
Voltage
Source
FUNCTION
MODE
MANUAL
TRIGGER
ON
Rotate
either
direction.
Return
to
2.0.
Press
each
switch
sequentially;
return
to
X1K.
Rotate
ccw.
Rotate cw. Return
to
OFF.
Rotate cw.
Vary
input
dc
voltage;
then discon-
nect
VCG
IN
input.
Press
A/-,
1j
,
'V
.
Gate
(CONT
depressed,
TRIG/GATE
released).
Press
and
hold.
Observation
±10V
square
wave
on
CH1
and
±1V
on CH2.
Return
to
CH1
only.
Rotation
ccw
increases frequency
of
Ti
;
rotation
cw
decreases
frequency.
Frequency
increases
in
decade
steps,
left
to
right.
Amplitude decreases.
Output immediately
offset
negative,
then
moves
positive.
OFF
return
it
to original
level.
Square
returns
to original
amplitude.
Frequency
increases
with positive voltage
and
decreases
with negative voltage.
Observe A/-
,
1i
,
\
waveforms.
A
dc
level
near zero
volts
(except
li
function).
Continuous
\
.
Set
up
trigger
source as
shown
in
figure
2-2.
Set
trigger
source
for
100
Hz
TTL
signal.
Trigger (depressed)
\
gated on
during
positive portion of
TTL
signal
on CH2.
j
One -\-
cycle per
trigger cycle.
2-2
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