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INSTRUCTION MANUAL
@ 1980 Wavetek
THIS DOCUMENT CONTAINS INFORMATlON PRO-
PRIETARY TO WAVETEK AND IS SOLELY FOR IN-
STRUMENT OPERATION AND MAINTAINANCE. THE
INFORMATION IN THIS DOCUMENT IS NOT TO BE
DUPLICATED IN ANY MANNER WITHOUT THE
PRIOR APPROVAL IN WRITING OF WAVETEK.
SAN DIEGO
9 0 4 5 B a l b o a A v e . , S a n Dlego, Calif. 9 2 1 2 3
P . O. B o x 6 5 1 , S a n Diego, California 9 2 1 1 2
. Manual Revision 7/80
Tel 7 14/279-2200 TWX 9 1 o-335-2007 Instrument Release C-1 180
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Figure i. Model 802 50 MHz Pulse Generator
1.1 THE MODEL 802 Double Pulse: Same as continuous, triggered and gated,
except two pulses for each period. Time to second pulse is
The Model 802 is a 50 MHz general purpose laboratory controlled by delay control. Double pulse at all outputs
pulse generator. The instrument gives you full control i n except sync.
primary pulse triggering and shaping plus simultaneous TTL,
m and sync pulses. The primary pulse output has control- External Width: External signal at trigger input determines
lability in rate, width, delay, upper level, lower level and a output pulse width and period as shown.
choice of positive, negative or complementary outputs. The
TTL and TTL are of fixed levels and rise times that are
standard for use with compatible devices. The primary pulse
TTL TRIG ____s-?l_-
has rise and fall times of 5 ns or less. LEVEL I I
I I
The output is t30 volts with a 5OQ termination. Upper and
I
I I
lower pulse levels are fully adjustable through +lO volts, a PULSE
20 volt window. Termination may be internal, at the load OUTPUT i-in
or both.
Single pulses or pulse pairs may be triggered; pulse width
may be trigger controlled; continuous pulses may be gated 1.2.2 Pulse Outputs
for a `
burst' output.
Variable Amplitude Pulse
0
`1.2 SPECIFICATIONS E cl
d $$ AMPLITUDE
!s
2 cs
1.2.1 Versatility t2 MAXIMUM MINIMUM
0
Four Simultaneous Pulse Outputs
Fixed TTL level sync, TTL and m outputs, and variable
amplitude output pulses are available over a 5 Hz (200 ms)
to 50 MHz (20 ns) frequency range.
1 ka
I
OR
501n +j()V -_-_-_-_--___-_
_-r--r -r---dv
SOi l>lka -10V _--------------
For optimum pulse characteristics from the variable ampli-
tude pulse output, an internal 5052 load can be selected via
a front panel control. Upper and lower pulse levels are independently adjustable.
Pulse dynamic range is +lOV when load is 5Oa terminated
Operational Modes and source is not (internal 5OQ off) or vice versa. Maximum
Continuous: Generator oscillates continuously at selected pulse amplitude is 1OV; minimum is 1V. Dynamic range
frequency. and pulse amplitude are decreased by a factor of 2 when
source and load are 5Oa terminated. Overshoot and ringing
Triggered: Generator quiescent until triggered by external are less than +(5% of amplitude setting +I00 mV) when ter-
TTL pulse or front panel control, then generates one pulse. minated into 5052 at both load and source. Transition times
are less than 5 ns.
Gated: Generator oscillates at the period rate selected by
the front panel control when gate input is high. Generator Sync, TTL and TTL Pulses
quiescent when input is low. First cycle is synchronous Sync pulse levels from 5Os2; TTL and TTL pulse levels into
with rising edge of gating signal. 50!2 termination.
1-1
Delay jitter is less than +O.l% plus 50 picoseconds. Fixed
delay is as shown.
SYNC, TTL
TTL
FIXED DELAY4 )6- 40 ns TYPICAL
SYNC
Transition times less than 7 ns into 5Oa termination. I
F I X E D DELAY+ b+- 20 ns TYPICAL
Normal/Complement Control
O"TP"To
Normal pulse or its complement is selected. The normally
quiescent and active levels are reversed in complement for-
mat. This control affects all outputs except sync pulse.
7.2.3 Time Domain 1.2.4 Input Characteristics
Period External Trigger
Period range is from less than 20 ns to greater than 200 ms The circuit receiving the external trigger is TTL compatible.
in 7 overlapping ranges. Period jitter is less than +O.l% plus Triggering level is fixed at approximately 1.4V. Input im-
50 picoseconds. pedance is greater than 5OOQ shunted by approximately
33 pF. Triggering and gating occurs on the rising edge of
Width the input signal.
Width range is from less than 10 ns to 10 ms in 6 overlapping
ranges. Maximum duty cycle is 70% for periods to 200 ns, 1.2.5 General
decreasing to 50% for 20 ns periods. Width selector switch
also has a square wave detent and a customer-specified Environmental
detent.." rl~ duty cycle is 50 24% to 2 E_CS period, changing Specifications apply at 25