Table of Contents
Advertisement
Model
5315A/
B
O perat ion
3-8
3-47.
OPERATING
INSTRUCTIONS
WARNING
BEFORE THE INSTRUMENT ISSWITCHED ON, ALL
PROTECTIVE
EARTH
TERMINALS,
EXTENSION
CORDS, AUTOTRANS-
FORMERS, AND DEVICES CONNECTED TO IT SHOULD BE
CONNECTED
TO A PROTECTIVE EARTH GROUNDED SOCKET.
ANY INTERRUPTION OF THE PROTECTIVE
EARTH
GROUND-
ING WILL
CAUSE
A POTENTIAL SHOCK HAZARD
THAT
COULD
RESULT IN PERSONAL
INI
URY.
WARNING
ONLY
FUSES WITH THE REQUIRED RATED CURRENT AND
SPECIFIED TYPE SHOULD BE
USED.
DO NOT
USE
REPAIRED
FUSES
OR
SHORT CIRCUITED
FUSE-HOLDERS.
TO DO SO
COULD
CAUSE A SHOCK OR
FIRE
HAZARD.
I
CAUTION
I
Before the instrument is turned on,
it
must be set to the voltage
of the power source, or damage to
the
instrument could result.
3-48.
MEASUREMENT
PROCEDURES
3-49.
Figures
3-11
thro
ugh
3-17show genera
l
operating
procedures
with the
HP
Mode
l
5315A
/
B
Un iversa
l
Co unter
in typica
l
measurement
setu ps.
Description
numbers
match
the
locator
ill
ustrations.
The
fo
ll
owing paragraphs
provide recommended
operating
gU ideli nes,
to
assist
in
making
the
most
accurate measu
re
me nt possible.
3-50.
Frequency, Period, and Ralio Measurements
1.
for
cw
sine wave or symmetrical waveforms (triangle,
square,
etc.
)
use ac
coupli
ng
and
the sensitiv
ity
mode.
2.
For
asymmetrical waveforms
(pu
lse
trains,
TTL,
ECl signa
ls, ramps,
etc.
)
use
a combina-
tion
of dc cou pling, Trigger
l
evel,
and fixed attenuator.
AC cou pling these
types
of
sig-
nals tends
to
distort them
slight
ly,
d ue
to
the
chargi
ng
of
the capacitor. More important,
the
posi tion
of
the signal
on the
zero
preset
trigger level
is
determ ined
by the
average
dc
level of
the
input. Depending
on
the
pulse
width
and
duty
cycle,
this
dc
average
may
be
low
enough to
allow
the
base
li
ne noise to trigger
the
counte
r, prod
ucin
g extra
counts
(see
Figure
3-6). DC
coupling
fixes the
dc
level
of
the in
put
signa
l, which
,
--=-1{uu-----------il--------
-------~---
----
--I"m""""
--~'W.
h'l
.......
~.4".'
I.
....""'. h._.
-
Figure 3-6. AC Coupled Measurements
Advertisement
Table of Contents
