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ntroduction
The Type 114 Pulse Generator is a general purpose pulse
generator. Transistorized circuitry is used throughout, with
most of the components being mounted on an etched circuit
board.
The Type 114 Pulse Generator is versatile. The repetition
rate, width, and amplitude of the output pulse are individual
ly selectable by range and by variable control within each
range. Front-panel connectors are provided for the pulse out
put, trigger output, and external trigger input. A single front
panel switch selects both the amplitude range and polarity
of the output pulse. The trigger output pulse is set by a front
panel switch to occur on the desired edge (leading or trailing)
of the output pulse. In cases where the Type 114 is set for a
pulse width longer than the pulse repetition period, a built-
in feature automatically counts down the repetition rate to
permit the width of the output pulse to remain at the value
selected (such operation is indicated by a Width > Period
light). In addition, two Type 114's can be connected together
so that the output pulse of the second unit is delayed by the
pulse width (up to 10 ms) of the first unit.
Electrical
Pulse Period. The PERIOD switch and associated VARI
ABLE control provide continuously variable pulse periods
from 1 µ sec to 100 msec (pulse repetition rates from one mil
lion pulses per second to 10 pulses per second). An EXTER
NAL TRIGGER position on the PERIOD switch permits exter
nal control of the pulse period. With the VARIABLE control
at the CAL end of its range and the WIDTH > PERIOD light
unlit, the period accuracy is within ±3% of the indicated
value. Jitter is typically less than 0.05% of pulse period
+2 ms.
Pulse Width. The WIDTH switch and associated VARI
ABLE control provide continuously variable pulse widths from
l 00 n sec to 10 msec. With the width VARIABLE control at
the CAL end of its range, the width accuracy is within
±3%
of indicated value.
0.05%
plus
½ nsec.
An
position on the WIDTH switch disables the variable width
feature and changes the output to a square wave whose
repetition
rate
is determined
Period error in the square wave mode is < ±5%.
Output Polarity and Amplitude. The AMPLITUDE switch
provides for either polarity output with two amplitude ranges
(1 V to 3 V and 3 V to 10 V). The VARIABLE control permits
the output to be varied within the voltage ranges. Aber
rations (overshoot, rolloff, preshoot, or ringing) amount to
less than 5% at maximum amplitude.
Output mpedance. The output impedance of the Type
114 is given in Table 1-1. The figures given are typical and
are dependent upon the setting of the AMPLITUDE — VARI
ABLE control. Load impedance is not critical. Temporarily
SECTION 1
CHARACTERISTICS
Jitter is typically less than
additional
QUARE
WAVE
by the
PERIOD controls.
short circuiting the OUTPUT connector will not damage the
instrument.
WARN NG
The Type 114 should never be connected to an inductive
load, or any load that will produce a current which will feed
back into the instrument.
TABLE 1-1
Amplitude
Pulse
Range
±1 to 3 V
≈ 20 Ω
28 Ω to 48 Ω
±3 to 10 V
External Trigger
nput.
positive trigger signal of 2 to 20 volts and having a risetime
of 1 µ sec or less. Triggering signals up to 2 Mc may be used.
Trigger Output. The trigger output pulse into an open
circuit is approximately 3 volts; into a 50 Ω termination, the
trigger output pulse is approximately '/ 2 volt. A front-panel
switch allows the output trigger pulse to be set to occur at
the leading edge or the trailing edge of the main pulse.
nput Power Requirements. ≈ 15 watts; 50 to 400 cps,
94.5 to 137.5 or 189 to 275 volts, ac.
Warm-up Time at +25°C ±5°C. Five minutes for rated
accuracies.
Environmental
Operating
Temperature
Altitude
Non-Operating
Temperature
Altitude
Mechanical
Dimensions
Connectors
Accessories
ee standard accessory lists in this manual for accessories
supplied with each instrument. For optional accessories, see
the current Tektronix, Inc. catalog.
Pulse
on
off
19 Ω to 22 Ω
30 Ω to 95 Ω
External triggering requires a
0°C to +50°C
15,000 feet maximum
— 40°C to +65°C
50,000 feet maximum
Approximately 9" X 6" X
12 ½" overall
Front-panel connectors are
BNC type.
1-1
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