Tektronix 3B2 TIME-BASE Instruction Manual page 7

OPERATING INSTRUCTIONS
Introduction
This section describes the operation of the front-panel
controls and provides step-by-step instructions for display-
ing a signal, Measurements that can be madé with the
Type 3B2 are described in the Applications section of this
manual.
If delay time is changed from long-delay to short-
TRIGGER LEVEL Sets the voltage point on the slope of
the trigger waveform at which the trigger
signal passes to the trigger circuits. De is
AC FAST: Only high-frequency component
ing portion of the trigger signal.
ing portion of the trigger signal.
LINE: Trigger-signal source is the line volft-
age.
Connector used to connect an external
SWEEP DELAY IN: After the trigger pulse occurs, the
start of the sweep is delayed by the time
selected by the DELAY TIME switch and
OUT: Sweep initiated immediately by the
trigger pulse; no delay between the trig-
ger pulse and start of the sweep.
DELAY TIME A 6-position switch for fixed delay times
from 1 sec to 10 psec (multiplier dial set at
1.00). Multiplier dial provides increments
between 0.50 and 10.50 times switch set-
ting. For example, if the switch is set at
10 ys, and the dial at 4.93, delay time
would be 4.93 times 10 usec or 49.3 psec.
DEL'D TRIG Connector with an output pulse that can
OUT be delayed to occur after the trigger pulse
by the time set on the DELAY TIME switch
and dial. The pulse has an amplitude of
about 6 volts with a width of about 0.5
psec and can be used to trigger external
SWEEP -++ Connector with a +15-volt gate output
GATE OUT pulse. Pulse length is the same as sweep
length.
POSITION Control that moves the display horizon-
tally.
SWEEP CAL Screwdriver adjustment that compensates
for variations in deflection-plate sensitivi-
ty between oscilloscopes.
TIME/DIV An 18-position switch that sets the cali-
brated sweep rate of the display.
DIGITAL Red knob concentric with the TIME/DIV
RESOLUTION switch. When the digital unit displays
time measurements, this control selects
the digital resolution pulses used between
10 msec and 0.1 psec. (Some digital units
may not use 0.1 psec.) Also selects proper
decimal and units of measure for the digi-
tal display.
FIRST-TIME OPERATION
The following steps should help you become familiar
with the instrument operation. The front-panel controls and
connectors, their use, and the expected results are described.
Insert the Type 3B2 into the right-hand (X-axis) opening
of a Tektronix Type 567 Readout Oscilloscope. Use a Type
3A2 Dual-Trace Amplifier plug-in unit in the left-hand
(Y-axis) opening.
1. Preset the Type 3B2 controls as follows:
LEVEL 0
COUPLING DC
SOURCE INT
SWEEP DELAY OUT
POSITION Centered
2. Connect a cable from the oscilloscope calibrator 5-
volt jack to the Channel 1 input of the Type 3A2 plug-in.
Set the Type 3A2 VOLTS/DIV switch to 1, and adjust the
2-1