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1.1
THE MODEL 143
The Model
143 20 MHz Function Generator is a precision
source of sine, triangle and square waveforms, negative and
Positive pulses and dc levels. All are front panel and external
control
variable
from
0.0001
Hz to 20 MHz and can be
modulated, swept or dc controlled over a 1000:1
range by
an external voltage. Output can be continuous or the gener-
ator can be triggered or gated by an external voltage or front
panel switch.
The waveform amplitude can be varied up to 30 volts peak-
to-peak
(open circuit) and attenuated up to 80 dB. Pulse
amplitude can be varied from +15 volts peak (open circuit).
DC voltage or de offset of signal is variable by front panel
control and by external control between +15 volts (open сїг-
cuit). Waveform symmetry is variable from 19:1 to 1:19 for
control
of duty cycle and ramp rise/fall times. Triggered
waveform
start/stop point is adjustable for creation of spe-
cial waveforms such as the haversine. A voltage representing
generator frequency and a TTL level sync pulse at the fre-
quency of the generator are auxiliary outputs.
1.2
SPECIFICATIONS
1.2
Versatility
Waveforms
Selectable sine
^V
, square
Sr
, triangle
NY, , positive
square
Γι
,negativesquare
1r
,TTL sync pulse and dc.
Symmetry
of waveforms
may
be varied for sawtooth and
variable duty cycle pulses.
Operational Modes
Continuous:
Generator
oscillates continuously at selected
frequency.
Triggered:
Generator
is quiescent
until
triggered
by an
external
signal or manual
trigger, then generates one cycle
at selected frequency.
Gated:
As triggered mode, except generator oscillates for
the duration of the gate signal.
SECTION
GENERAL DESCRIPTION
Frequency Range
0.0001
Hz to 20 MHz
in 10 overlapping ranges with 196
vernier control.
Function Output
Ж" Ч
? Av
selectable and variable to 30V p-p (15V p-p
into 500).
γι,
лг,
to 15 Vp (7.5 Vp into 5082). All
waveforms
and dc can supply
150 mA
peak current and
may be attenuated to 60 dB in 20 GB steps with an additional
20 dB vernier.
DC Output and DC Offset
Selectable
thru
FUNCTION
OUT
output.
Controlled
by
front panel control or by applying an external voltage. Ad-
justable between +15 Vdc (+7.5 Мас into 500) with signal
peak plus offset limited to +15 Vdc (57.5 Vdc into 500).
External
offset
sensitivity
approximately
—1
V/V
with
output
into
open
circuit.
DC
offset
and
output
wave-
form
attenuated
proportionately
by
the
60
dB
output
attenuator.
Sync Output
A TTL level pulse. Will drive 50 termination.
GCV — Generator Controlled Voltage
At GCV OUT connector, a 0 to *2V signal proportional to
generator frequency. 600€2 source impedance.
VCG — Voltage Controlled Generator
Up to 1000:1
frequency
change with external O to 2 volt
signal to VCG
IN connector.
Upper and lower frequencies
limited to maximum and minimum of selected range.
Slew rate:
296 of range per us.
Linearity:
+0.2% for 10 Hz to 100 kHz.
*0.7596 for 0.001 Hz to 2 MHz.
Input Impedance:
2 КО.
Trigger and Gate
Input Range:
1V p-p to *10V.
Impedance:
10 КО, 33 pF.
Pulse Width: 25 ns minimum.
Repetition Rate:
10 MHz maximum.
Adjustable Triggered Signal Start/Stop Point (sine and tri-
angle only): Approximately —90° to +90° to 2 MHz.
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