Model 5315A/ B
Operat
io
n
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 INIURY.
WARNING
ONLY
FUSES
WITH THE RE
QUIRED
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
through 3-17show general
ope
rating procedures with the
HP
Mode
l
53
1
5A
/ B
Un
iversal Counter in typical measurement setup
s.
Description numbers match
the
locator
ill
us
trat
io
n
s.
The
fo
ll
owing paragraphs provi
de
recommended
operating
gU
id
elines, to assist
in
making the most accurate measurement
po
ss
ible.
3-50. Frequency, Period, and Ralio Measurements
1.
for
cw sine wave
or
symmetrical wavefo
rm
s (triangle, square, etc.) use ac coupli
ng
and
the se
nsi
tiv
it
y mode.
2.
For
asy
mmetr
ical
waveforms (pu lse trains,
TTL
, ECl sig
na
ls,
ramp
s,
etc.) use a combina-
tion of dc
coupling,
Tri
gger l evel, and fixed attenuator.
AC
coupling
the
se types of sig-
nals tends to distort them slightl
y,
due to the charging of the capacitor. More important,
the position of the
sig
n
al
on the zero preset t
rig
ger level
is
determ
in
ed
by
the
average
dc
level of the input. Depending on
the
pulse width and duty
cy
cle, t
hi
s dc avera
ge
ma
y
be
low
enough
to a
ll
ow the
ba
se
li
ne noise
to
trigger
the
co
unte
r,
producing extra
counts (see Figure 3-6). DC
coup
ling fi
xes
the dc
le
vel of the
in
put
signal, w
hi
ch
,
--=-1{
u
u--
-----
--
--
il--
---
-
--
-
------
~
---
---
-
--
I"m
"""
"
--
~'W.
h'l
.......
~.4".'
I.
....""'.
h._.
-
Figure 3-6.
AC
Coupled
Measurements
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