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Philips pm2521 - Page 44

Philips pm2521
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43
TEMPERATURE
MEASUREMENTS
IN
RELATIVE
REFERENCE
MODE
(ZERO
SET)
—
Measure
the
temperature
as
described
above.
—
Depress
pushbutton
ZERO
SET.
Remark:
The
display
will
be
held
for
one
second
and
a
Z
will
appear
on
the
right
hand
side
of
the
display.
The
vakjefohich
is
on
the
display
during
this
one
second
is
the
relative
reference
value.
After
this
one
second
the
display
jumps
to
zero
and
the
indication
ZS
will
appear
on
the
display.
The
PM
2521
has
now
been
switched
to
the
relative
reference
mode
(ZERO
SET).
In
the
relative
reference
mode
the
PM
2521
switches
to
manual
ranging*.
Each
subsequent
reading
will
indicate
the
positive
or
negative
deviation
from
the
relative
reference
value.
—
To
leave
the
relative
reference
mode
depress
pushbutton
ZERO
set
again.
6.4.1.9.
Frequency
measurements
(Hz)
*
GENERAL
“
The
frequency
measurements
in
the
PM
2521
are
made
in
conjunction
with
the
trigger
level
function.
Each
time
the
input
signal
exceeds
the
trigger
level
a
count
is
made.
As
the
trigger
can
be
adjusted,
it
is
important
to
know
where
the
trigger
level
is
and
if
triggering
takes
place
before
frequency
measurements
are
made.
The
order
for
measuring
the
frequency
of
a
signal
is
as
follows:
—
Selection
of
the
sensitivity
range.
—
Selection
of
the
trigger
level
—
Measurement
of
the
frequency
FREQUENCY
MEASUREMENTS
Selection
of
the
sensitivity
range
—
Select
function
with
the
function
selector.
*
—
Select
the
automatic
ranging
mode
by
depressing
the
AUTO/MAN*
pushbutton.
Remark:
Manual
ranging
is
indicated
with
*
on
the
display.
—
Connect
the
voltage
source
to
the
0
and
V
terminal
and
measure
the
input
signal.
—
Make
a
note
of
the
selected
range
and
polarity.
Slow
signals
may
pass
more
than
one
range.
*
—
Select
function
trigger
level
with
the
function
selector
and
select
one
of
the
noted
ranges
and
polarity.
Remark:
Ranges
Trigger
level
200
mV
2
V
2
V
20
V
20
V
200
V
200
V
2000
V
2000
V
Input
signals
that
are
lower
than
7,5
%
of
the
end
of
range
value
of
the
trigger
level
range
cannot
be
triggered
accurately.
In
the
trigger
level
function
only
manual
ranging
is
possible
with
the
pushbuttons
UP
or
DOWN.
■
«
V

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