Tektronix 114 User Manual

SECTION 2
OPERATING INSTRUCTIONS
Front-Panel Controls, Indicators, and Connectors
(See Fig. 2-1.)
The function of each item on the Type 114 front panel is
given in the following tabulation.
POWER
Switch This toggle switch completes the circuit
to the primary of the power transformer.
Indicator The white lamp to the right of the POWER
switch lights when the Type 114 is en 
ergized.
PERIOD
Switch This switch selects the basic range of
pulse period. When the switch is set to
EXTERNAL TRIGGER — INPUT, the Type
114 provides width and amplitude control
for externally generated pulses applied to
the INPUT connector. Note that “ 100 mS"
does not indicate a switch position, but
is instead an index for the VARIABLE
control.
VARIABLE This control has a range of 10:1 or more,
Control and provides continuous coverage between
the steps of the PERIOD switch.
EXTERNAL BNC connector to which the external trig-
TRIGGER- ger is applied when externally triggering.
INPUT Con 
nector
WIDTH
Switch This switch selects the basic ranges of
pulse width. Note that the word “ 10 mS ”
does not indicate a switch position, but is
instead an index for the associated VARI 
ABLE control.
When the WIDTH switch is set to SQUARE
WAVE, the output of the Type 114 is a
square wave whose period is selected by
the PERIOD controls.
VARIABLE This control provides continuous cover-
Control age between the steps of the WIDTH
switch and has a range of 10:1 or greater.
WIDTH > With the flexibility provided, it is possible
PERIOD In- to set the controls so that the width of the
dicator light pulse selected exceeds the period selected.
When this occurs, the Type 114 counts
down the repetition rate and lights the
WIDTH > PERIOD light. The pulse width
remains as selected, but the pulse period
is no longer that selected by the PERIOD
controls.
AMPLITUDE
Switch Selects the two basic voltage ranges and
the polarity of the output signal.
VARIABLE Provides for varying the output amplitude
Control within the range selected by the AMPLI 
TUDE switch.
OUTPUT
Connector
BNC connector from which the output is
taken.
TRIGGER
Switch This switch permits the operator to select
the edge of the output pulse at which the
trigger pulse occurs.
Connector BNC connector from which the trigger
pulse output is taken.
First Time Operation
The following procedures are designed to acquaint the
operator with the operation of the Type 114.
1. Set the three VARIABLE controls extreme counterclock 
wise. Set the PERIOD switch to 100 µ S, the WIDTH switch to
SQUARE WAVE, and the AMPLITUDE switch to the " + 1 TO
+3 V" position.
2. Connect the OUTPUT connector of the Type 114 to the
vertical input of an oscilloscope (Tektronix Type 547/1 Al or
equivalent) by means of a 50 ft coaxial cable. Terminate
the coaxial cable at the oscilloscope end with a 50 ft ter 
mination (Tektronix Part No. 011-049 or equivalent). Make
sure the input voltage switch is set to match the voltage of
the power source in use (115 or 230 V ac). See Fig. 2-2. At 
tach the power cord.
3. Apply power to the Type 114 and the oscilloscope. Set
the oscilloscope TIME/DIV or TIME/CM switch to .1 mSEC
and obtain a stable display.
4. Set the WIDTH switch to 10 µ S. Turn the associated
VARIABLE control clockwise and note the increase in pulse
width. When the control is turned so that the pulse width
exceeds 100 / j .S, the WIDTH > PERIOD lamp lights.
5. Operate the PERIOD, WIDTH, and AMPLITUDE switches
and controls throughout their ranges and check the results
with the oscilloscope.
Using the Type 114 as a Source of Delayed
Trigger
The use of the Type 114 as a source of delayed trigger
may be demonstrated as follows:
1. Apply a 1 Kpps signal (such as the output of the oscillo 
scope calibrator) through a BNC T connector and appro 
priate coax cables to the external trigger input connectors of
2-1

Tektronix 114 Specifications

General

Brand	Tektronix
Model	114
Category	Pulse Generator
Language	English