TYPE
240
SQUARE
TRIANGLE
SINE
TYPE
250
SQUARE
TRIANGLE
SINE
RAMP
TYPE 251
SQUARE
TRIANGLE
SINE
RAMP
COSINE
EXTERNAL
TRIGGERING,
(except
Type
240)
TYPE
255
SQUARE
TRIANGLE
SINE
RAMP
Each
external
trigger
pulse provides
one
complete out-
put waveform, at all outputs. Push-button
for
manual
triggering.
SIMULTANEOUS
OUTPUTS
3, 4,
or
5 different waveforms (depending
on
model)
simultaneously. Separate auxiliary-output jacks
for
each
waveform. Timing controls determine frequency of all
outputs.
DC
TRIGGERING
LEVEL
ADJUSTMENT
Starting point
on
si
ne
and triangle waveforms may
be
shifted up to 160° .
101
FREQUENCY
RANGE
51/.t"
HIGH-19
LBS.
SEPARATE RAMP GENERATOR
(255)
Separate frequency controls allow independent adjust-
ment of ramp time
base-variable
from 100
µ,
scs
to 16
minutes. However, ramp generator
is
automatically syn-
chronized with Main Generator
in
Tracking Mode.
In
this
mode, Main Generator timing-dial controls both ramp
and main base-frequency, while respective multipliers
operate independently.
DELAY AND GATING CIRCUITS
(255)
The Ramp Generator output
is
switched into the Main
Generator
trigger
circuits to provide delaying and gating
functions. Front panel switches permit selection of trig-
gering mode for both generators. Either generator can
be
used to
trigger
the
other-or
the Ramp Generator,
with its separate timing controls,
can
be
used to gate or
delay the Main Generator output.
WAVEFORM
CHARACTERISTICS:
Squarewave:
Risetime . . . . . . . . . .
..
.
..
.....
...
5 µsecs
or
faster
Symmetry . . .
..
..
....
.
..
. · .
.......
. .
...
.
99.5%
Overshoot .
.. ..
. .
..
.
...
.
..
.
...
. .
....
. . 1 % max
Droop
..
.
...
..
. . .
..
.
....
..
...
. .
.....
. 1 % max
Triangle:
Linearity .
....
. . .
..
..
.......
..
.
.. ..
. .
..
99.5%
Symmetry
...
. .
.. ..
. . .
.....
....
.
..
. .
...
99.5%
. Sinewave:
Total Distortion
.......
..
....
. Less than 1 %
to
lKC
2%
to
lOKC
Ramp:
Linearity . .
...
....
.
..
.
..
.
..
.
......
...
..
99.5%
Fall Time
..
. . .
..
.
..
.'
. .
... ...
..
.
6%
of
period max
Cosine:
Total Distortion . . .
..
.
..
.
.....
Less than 1 %
to
lKC
MAIN OUTPUT:
2%
to
lOKC
Amplitude .
..
.
.........
300
mv
to
25
volts
P-P
(min.)
Impedance . . . . . .
...
.
..
200
ohms (cathode follower)
Current
...
.
.......
.
...
.
..
. . . .
-3
to
+ 15 ma max
Amplitude Stability
...
. . .
..
0.5%
of
output
amptitude
Amplitude Change with
Frequency . . .
...
.
.....
0.
5%
@ 0.001
to
1000
cps*
Amplitude Change wi
th
Function
...
. . . .
less
than
2%
SQUARE-TRl·SINE
Frequency Range
...
.
.....
..
..
. 0.001
to
10
,
000
cps
Frequency
Dev
iation from Absolute . .
..
. .
......
.
3%
Long-Term Frequency Stability .
...
..
....
..
...
± 1 %
DC
Reference
Level Range
..
. .
-15
to
+
15
volts
or
switched
to
Ov
DC
Reference
Level Stability
..
..
.
...
± 100
mv
at
25
volts
output
*
AUXILIARY OUTPUTS:
Amplitude
..
... ...
. .
..
...
.
..
. .
30
volts P-P
(min)
Impedance . . . .
...
. . .
..
500
ohms (cathode follower)
Current
.....
.
....
.
.......
..
..
..
. .
...
. 5 ma max
Amplitude Stability . . . , . . .
.....
..
.
..
..
.
....
0.5%
*
Amplitude Change w /Frequency
..
Same as main
output
*
DC
Reference Level . .
.........
...
.
..
0 volts (fixed)
Frequency Range . ·
...
.
...
.
....
Same as main
output
*Cosine specs. somewhat broader.
DOMESTIC
PRICES:* (approx.
5%
higher overseas)
240
. . .
..
...
. .
..
.....
..
. .
....
.
..
.
..
..
$475.00
250 . . . .
... ...
..
. . . . . .
.. ..
.
..
..
.
...
..
$595.00
~
51
......
. .
........
. . .
..
. . . . .
..
.
....
$685
.
00
25
5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $785.:00
•complete
with 2 instruction manuals. 240RM, 250RM
and 251
RM
(rack-mount models) available
at
no
additional cost.
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