Specifications - Wavetek 145 Instruction Manual

1.1 THE MODEL 145
The Model 145 20 MHz Pulse/Function Generator has
the versatility of output found in a function generator,
plus the pulse characteristics of a pulse generator. It
is a precision source of sine, triangle, balanced
square, positive square and negative square
waveforms, a source of de levels and a source of nor-
mal and inverted pulses. All are front panel and
remote control variable from 0.0001 Hz to 20 MHz
(periods from 50 ns to 1 O,OOOs). Pulse widths are
variable from 25 ns to 1 ms and pulse delays variable
from 50 ns to 1 O ms. Double pulses (two pulses per
period) are also available with variable time between
pulses. The logical complement of the pulse is selec-
table and either pulse .QI_complement are output
simultaneously as ECL, ECL, TTL, TTL and variable
amplitude and offset pulses.
The amplitude controllable output of either waveform
or pulse can be varied to 30 volts peak-to-peak (open
circuit) and attenuated up to 80 dB. DC voltage or de
offset of signal is variable by front panel control and
by external control between ± 15 volts (open circuit).
The outputs are also triggerable for one or multiple
cycles by front panel switch or remote signal. A
voltage representing generator frequency and a TTL
level sync pulse at the frequency of the generator are
auxiliary outputs.
1.2 SPECIFICATIONS
1.2.1 Versatility
Instrument operates as either a function generator or
pulse generator.
1.2.2 Function Generator
Waveforms
Selectable sine'\, , square
'Li ,
triangle
I\.;,
positive
square n. , negative square
u
and de. TTL sync
pulse and fixed amplitude pulses of TTL, TTL, ECL and
ECL, all simulaneously available with function output.
Operational Modes
Continuous: Generator oscillates continuously at
selected frequency.
Triggered: Generator is quiescent until triggered by an
1
SECTION
GENERAL DESCRIPTION
external signal or manual triger, then generates one
cycle at selected frequency.
Gated: As triggered mode, except generator
oscillates for the duration of the gate signal.
Frequency Range
0.0001 Hz to 20 MHz in 10 overlapping ranges with
approximately 1 % vernier control.
Function Output
f\.; ,
'Li ,
I\;
selectable and variable to 30 Vp-p
(15 Vp-p into 500). n. , u, to 15 Vp (7.5 Vp into 500).
All waveforms and de can supply 150 mA peak cur-
rent and may be attenuated to 60 dB in 20 dB 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.
Adjustable between a minumum of ± 14.4 Vdc ( ± 7 .2
Vdc into 500) with signal peak plus offset limited to
± 14.4 \fdc ( ± 7.2 Vdc into 500). External offset sen-
sitivity approximately - 1 VN with output into open
circuit. DC offset and output waveform attenuated
proportionately the 60 dB output attenuator.
Sync Output
A TTL level pulse. Will drive 500 termination.
GCV-Generator Controlled Voltage
At GCV OUT connector, a O to
+
2V signal propor-
tional to generator frequency. 6000 source im-
pedance.
VCG-Voltage Controlled Generator
Up to 1000:1 frequency change with external O to 2
volt signal to VCG IN connector. Upper and lower fre-
quencies limited to maximum and minimum of
selected range.
Slew Rate: 2% of range per µs.
Linearity:
±
0.2% for 10 Hz to 200 kHz.
± 0.75% for 0.001 Hz to 2 MHz.
Impedance: 2 kO.
Trigger and Gate
Input Range: 1 Vp-p to ± 1 OV.
1-1