Wavetek 801 Service manual
INSTRUCTION MANUAL
MODEL 801
50
MHz PULSE
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO WAVETEK. THE INFORMATION IN
THIS DOCUMENT IS NOTTOBE USED FOR DUPLICATED
IN ANY MANNER WITHOUT THE PRIOR APPROVAL
IN WRITING OF WAVETEK.
SAN DIEGO
9045Balboa Ave.,
P. 0.Box 651, SanDiego, California 92112
Tel 7
14/279-2200
San Diego,
Calif.
92123
TWX 9 1 o-335-2007
REV C .
8/77
SECTION
1
GENERAL DESCRIPTION
1.1 THE MODEL 801
The Model 801 is a 50 MHz general purpose laboratory pulse
generator. The instrument gives you full control in primary
pulse triggering and shaping plus simultaneous TTL, ECL,
ECL
and sync pulses. The primary pulse output has controllability in offset and independent rise/fall durations, as well
as pulse width, pulse delay and a choice of positive, negative
or complementary outputs. The TTL, ECL and
fixed levels and rise times that are standard for use with
compatible devices. The primary pulse has minimum rise
and fall times of 7 ns and a maximum of 250 ms.
+20
The output is
provides
levels are fully adjustable through
External triggering can be set to any point of the rising or
trailing edge of the trigger signal. Single pulses or pulse pairs
may be triggered; pulse width may be trigger controlled;
continuous pulses may be gated and a precise number of
pulses may be triggered for a ‘burst’ output. Manual and
external triggering is indicated by an LED on the front panel
for rapid visual set of trigger level.
1.2 SPECIFICATIONS
1.2.1
Five Simultaneous Pulse Outputs
Fixed level ECL,
with variable amplitude
available over a 5 Hz to
to 20 ns periods).
+lO
Versatility
volts with
volts into a
m,
5Oa
source impedance which
5Oa
load. Upper and lower pulse
+20
volts.
TTL and sync pulses and a pulse
and variable rise/fall times. Pulses
50 MHz frequency range (200 ms
ECL
are of
double pulse controlled by delay control. Double pulse at
all outputs except sync.
External Width: External signal at trigger input and trigger
level control determine output pulse width and period as
shown.
TRIGGER LEVEL WINDOW
TRIGGER LE
Trigger Burst:
time) for pulse burst (1 to 100 pulse range) as shown.
External trigger starts internal gate (delay
TRIGGER LEVEL
TRIGGER
+
I
‘DELAY TIME’ GATE
PULSE
1.2.2
Pulse Outputs
BURST OUTPUT
-I
hlnn
I
Operational Modes
Continuous: Generator
frequency.
Triggered: Generator quiescent until triggered by external
signal or front control, then generates one pulse.
Gated: As triggered mode, except generator oscillates for
the duration of the external signal.
Double
except
Pulse: Continuous, trigger and gate, as above,
two pulses for
oscillates continuously at selected
each period. Space between pulses of
Variable Amplitude Pulse
Upper and lower pulse levels are independently adjustable.
*2OV
Pulse dynamic range
5052 source. The pulse is 20V p-p maximum, 1V p-p mini-
mum. Into a
maximum pulse 1OV p-p, minimum pulse
Overshoot and ringing is less than
+100
mV) into 5Oa load.
Preshoot is less than
5Oa load.
into
is
5Os1
termination, dynamic range is
into an open circuit from the
0.5V
*(5%
of amplitude setting
+(5%
of amplitude setting
p-p.
+100
+lOV,
mV)
l-l
Fixed (ECL, ECL, TTL) Pulses
Pulse levels for
ECL
Em
ECL, ECL Transition Time: < 6 ns.
TTL
TTL Transition Time: < 10 ns.
5On
loading as shown:
-1 8” A
.
-,
.8V
--7-r--
<o
4Vn
.
Sync Pulse
Sync pulse is 0 to at least
+1V
from a
-0.9V
-“”
>2s4V
5Oa
source.
Delay
Pulse occurrence can be delayed from less than 10 ns to
100 ms with respect to the sync pulse. Maximum duty
cycle is 70% for periods to 200 ns, decreasing to 30% for
20 ns periods.
Delay jitter is less than 0.1% plus 50 picoseconds.
Fixed delay is as shown:
TRIGGER LEVEL
TRIGGER INPUT
FIXED
DELAY4 b -4Ons
Normal/Complement Control
Normal pulse or its complement is selected. The normally
quiescent and active levels are reversed in complement
format. This control affects all outputs except sync pulse.
1.2.3
Period range is from less than 20 ns to greater than 200 ms
in 7 overlapping ranges.
Period jitter is less than 0.1% plus 50 picoseconds.
Time Domain
Width
Width range is from less than 10 ns to 100 ms in 7 overlapping ranges. Maximum duty cycle is 70% for periods to
200 ns, decreasing to 50% for 20 ns periods. Range switch
also has a square wave detent
‘L
duty cycle is 50 -+4% to 2
50 +15% at 20 ns period.
Width jitter is less than 0.1% plus 50 picoseconds.
( % ).
pus
period changing to
1.2.4
SYNC PULSE
FIXED DELAY
VARIABLE
AMPLITUDE
PULSE
Input Characteristics
t
1
--+( k ~20
__n-
ns
External Trigger
The external signal required to trigger the generator has a
minimum amplitude of
to
k600 mV
mum amplitude of
Input impedance is approximately 1 ka
22 pF
Triggering is selected to occur at either rising or falling edge
of trigger signal; triggering level is adjustable to be between
+4V.
external and manual trigger occurrence accepted.
1.2.5
p-p to 50 MHz (from
An LED lights for approximately 100 ms for each
General
+200 mV
+lOV
with a minimum width of 10 ns.
p-p to 5 MHz increasing
5Oa
source) and a maxi-
in parallel with
Sync pulse duty cycle is 50
period, changing to 50 +I 5% at 20 ns period except in
trigger and external width modes, in which case it is determined by the trigger signal.
24% of pulse period to 2
Transition Time
For variable amplitude pulse only. Independently adjustable
leading and trailing edges from less than 7 ns (5 ns typical)
to 250 ms in 7 overlapping decade ranges (measured from
10 to 90% points). Verniers give
ranges except 5 ns, which gives 25: 1.
Linearity:
10 to 90% points on pulse.
l-2
For transition greater than 10 ns
50:1
adjustment on all
+5% between
pus
Environmental
Specifications apply at 25°C
Instrument will operate from 0°C to 50°C.
*5”C
after 1 hour warm-up.
Dimensions
28.8
cm (11.4 in.) wide; 17.3 cm (6.8 in.) high; 29 cm
(11.4
in.) deep.
Weight
5.4
kg (12 lb) net; 7.3 kg (16 lb) shipping.
Power
90
to1 10V,108 to
50to400 Hz;
132V,
60 watts nominal.
to220Vor216
180
to250V;
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