Fluke 8024B - Page 34

8024B
AUDIBLE
TONE
DISPLAY
TYPICAL
INPUT
SIGNALS
Figure
2-11.
Level
Detector
Operation
7.
For
short
pulses,
your
8024B
has
a
pulse
stretcher
circuit
that
captures
and
holds
the
pulses
long
enough
for
the
display
and
tone
to
respond,
typically
for
100
ms.
The
input
impedance
of
the
level
detector
is
>100
k{
so
as
not
to
load
logic
circuits.
The
level
detector
is
also
usable
on
the
2
kO
range.
On
this
range,
the
reference
level
is
+0.4V
nominal.
See
Measurement
Techniques
for
additional
information.
2-45.
Peak
Hold
Operation
CAUTION
The
PEAK
HOLD
switch
is
a
push-push
type.
Operate
this
switch
by
pushing
to
the
right
only.
Do
not
push
or
pull
the
switch
to
the
left
(off).
2-46.
The
peak
hold
function
provides
short
term
memory
of
the
most
positive
dc
or
ac
rms
level
(Figure
2-12).
The
peak
hold
function
is
intended
to
be
used
for
voltage
and
current
measurements.
Proceed
with
the
steps
of
operation
for
the
measurement
function
being
used
with
the
peak
hold
function.
When
the
test
leads
have
been
connected
to
the
circuit
to
be
measured,
set
the
PEAK
HOLD
switch
to
ON.
For
a
new
reading,
set
the
PEAK
HOLD
switch
to
OFF
then
back
to
ON.
To
read
negative
peak
signals,
reverse
the
test
connections.
An
example
peak
hold
operation
would
be
as
follows:
1.
Set
the
PEAK
HOLD
switch
to
OFF.
4.
Select
the
DC,
V
(volts)
functions.
3.
Insert
the
red
test
lead
into
the
V/
Q/S
input,
and
select
the
20V
range.
4.
Locate
the
battery
eliminator
connector
on
the
right
side
of
the
unit.