SECTION 3
Some fundamental factors to consider when preparing the
Type 109 Pulse Generator for use with other equipment
will be covered in this section of the manual. Several repre
sentative test systems including a few specialized examples
will also be illustrated and discussed. These systems pro
vide a basis for the development of other specialized
systems as required by specific applications.
Pulse Definitions
The following terms are commonly used in describing
pulse characteristics and are defined here for convenience.
The terms are illustrated and applied in Fig. 3-1. The input
pulse represents an ideal input waveform for comparison
purposes. The other waveforms represent typical output
waveforms in order to show the relationships. The terms
are defined as follows:
Risetime tr: the time interval during which the amplitude
of the output voltage changes from 10% to 90% of the
rising portion of the pulse.
APPLICATIONS
Falltime tf: the time interval during which the amplitude
of the output voltage changes from 90% to 10% of the
falling portion of the waveform.
Pulse Width (or Duration) tw: the time duration of the
pulse measured between the 50% amplitude levels of the
rising and falling portions of the waveform.
Time Delay td: the time interval between the beginning
of the input pulse (t = 0), and the time when the rising
portion of the output pulse attains an arbitrary amplitude
of 10% above the base line.
Tilt: a measure of the tilt of the full amplitude, flat-top
portion of a pulse. The tilt measurement is usually expressed
as a percentage of the amplitude of the rising portion of
the pulse.
Overshoot: a measure of the overshoot occurring gener
ally above the 100% amplitude level. This measurement is
also expressed as a percentage of the pulse rise.
Bear in mind that these definitions are for guide pur
poses only. When the pulses are very irregular (such as
excessive tilt, overshoot, etc.) the definitions may become
ambiguous. In such cases, a more complete description of
the pulse will probably be necessary.
o
<
o
>
INPUT
PULSE
TIM E
tr= R IS E T IM E
tf = F A LL TIM E
t - = PU LS E W ID TH
td = TIM E D E L A Y
% T I L T = - X 1 0 0 %
D
% O V E R S H O O T —— X 1 0 0 %
D
■
--»-j
td J-*---
F ig . 3 - 1 . Term s used in d e sc rib in g p u lse c h a ra c te ristic s.
3-1
Содержание TYPE 109
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