Tektronix 314 Manual

MEASUREMENT TECHNIQUES
The following procedure describes a few operational tech 
niques and measurements that can be made or used with the
314.
TRIGGERING THE SWEEP
The 314 sweep can be triggered from an internal or external
source. Internal triggering is used for most applications in 
volving time, frequency, and amplitude measurements. At
least 0.3 div of deflection is required to trigger the sweep.
After selecting the triggering source, the method of coupling
must be determined. Frequency limitations or ranges of the
coupling methods are described under Function of Controls
and Connectors. Use AC LF REJ (ac low-frequency reject)
to improve trigger stability when a trigger signal above 50
kHz contains low-frequency components that interfere with
triggering. Use dc coupling for the external trigger if a very
low frequency is the triggering source.
Either manual (NORM) or automatic triggering (AUTO)
mode can be used with a choice of triggering on the (+)
positive-going or ( — ) negative-going slope of the triggering
signal. For most applications, automatic triggering is used
because a sweep is generated even when a trigger signal is
absent.
In AUTO mode, the displayed signal locks to the trigger
rate when a trigger signal is present to produce a stable dis
play. AUTO mode covers a wide amplitude range and
permits rapid observation of many signals and frequencies.
Manual (NORM) triggering is used when the exact trigger 
ing point is important, or for triggering on signal frequen 
cies below about 30 Hz. Manual triggering can also be used
to trigger on single-shot or random events. Triggering
occurs in manual operation when the signal amplitude pas 
ses through a reference level set by the LEVEL control.
Changing the trigger signal amplitude or LEVEL control
setting affects the sweep start.
Triggering Internally on the Input Signal
a. Press INT and AC buttons in. Set LEVEL control to
midrange and SLOPE switch to +. Press AUTO button in.
b. Connect a low-frequency, sine-wave signal to CH 1 VERT
INPUT connector (right-side panel). Press CH 1 button in.
c. Set CH 1 VOLTS/DIV to .1. Adjust Sine-Wave Genera 
tor output for approximately 4 div of vertical display.
10
314 Operators

Tektronix 314 Specifications

General

Brand	Tektronix
Model	314
Category	Test Equipment
Language	English