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Figure
2-2.
Second
Setup
2.4
CHANGING THE OUTPUT IMPEDANCE
The
output
impedance
is
normally:
HI
10V
p-p
(50Q source)
into
50Q.
LO
IV
p-p
(50SJ
source)
into
500.
Amplitude
is
normally
variable
over
20
dB
with
-
50
dB
lowest possible amplitude.
If
simultaneous
6000
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
Control
Position/Operation
Observation
1
POWER
ON
±
10V
square
wave
on
CHI
and
±
IV on CH2.
Return
to
CHI
only.
2
Dial
Rotate
either
direction.
Return
to 2.0.
Rotation
ccw
increases frequency
of
Tj
;
rotation
cw
decreases
frequency.
3
FREQUENCY
MULTIPLIER
Press
each
switch
sequentially;
return
to
xlK.
Frequency
increases
in
decade
steps,
left
to
right.
4
AMPLITUDE
Rotate
ccw.
Amplitude decreases.
5
DC OFFSET
Rotate cw. Return
to
OFF.
Output immediately
offset
negative,
then
moves
positive.
OFF
return
it
to original
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
,
\
.
Observe
,
Tj
,
'V waveforms.
9
MODE
Gate
(CONT
depressed,
TRIG/GATE
released).
A
dc
level
near zero
volts
(except
Tj
function).
10
MANUAL
TRIGGER
Press
and
hold.
Continuous
A
.
Set
up
trigger
source as
shown
in
figure
2-2.
Set
trigger
source
for
100
Hz
TTL
signal.
11
A
gated on
during
positive portion of
TTL
signal
on CH2.
12
Trigger/Gate
i
Trigger (depressed)
One
-V
cycle per
trigger cycle.
2-2
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