Press and hold the MIN MAX pushbutton for 2 seconds and
Press
MIN MAX pushbutton for 2 seconds and then
then release in
to exit RECORD. This Meter
release
to exit RECORD (or HOLD and RECORD
knowledges with a beep
and RECORD is no longer
selected). This Meter acknowledges with a beep
and
displayed.
RECORD is no longer displayed.
5.14 Using
RECORD
n
n
n
AC
After enabling RECORD. press the MIN MAX pushbutton to
cycle through the MAX, MIN, and AVG readings held in
memory. this Meter is in CREST (that is,
MAX is held in memory.
limits the
of RECORD. The MAX reading is the maximum value
tected
RECORD started. The MIN reading the
mum value detected
RECORD
The AVG
reading calculated continuously from the
of RECORD.
To stop recording and to freeze the values of
MIN, and
AVG in memory, press the HOLD pushbutton. Press the MIN
MAX pushbutton to cycle through the readings, including a
where the
blinks. In this mode, readings
may be taken without disturbing the values held in memory.
To restart recording, press the HOLD pushbutton. Then,
RECORD blrnks.
.
When using HOLD and RECORD, note that when RECORD
is blinking, this Meter is recording values; when
RECORD
is not blinking, this Meter is not recording values. When
is blinking, the digital display is showing a real
measurement; when
is not blinking, the digital dis-
play is showing a
measurement. HOLD and
RECORD apply the digital display only. The bar graph
a real measurement only at all times.
you press the MIN MAX pushbutton to
recording while
in the HOLD mode, RECORD is not blinking
this
Meter is not recording values. And if you cycle through
the
MAX. MIN, and AVG readings, this Meter displays just
.
18
6. Applications of Measurement
6.1 Non-Linear Loads
True-RMS
flow is very impot-tant
it directly
relates to the amount of heat dissipated in wiring,
formers, and
connections. Most
in the
market measure
flow, not true rms
flow, even if this
flow is displayed on a
calibrated rms. These
are
accurate only for a pure sign-wave
All
waveforms are
in some way. The
most common is
distortion
by non-linear
loads such as household electrical appliances, personal
Computers or
controls for motor drives.
distortion
flow at frequencies that
are at odd
of the power
frequency.
flow gives a substantial
on the neutral
of star
power distribution Systems.
In most countries a power distribution
uses
mercial
power applied to a transformer
with a delta-connected
and a star
The secondary generally provides
AC from
neutral, and
AC from
to
To
the loads for
was a big headache for
the
designer, historically.
The
addition of the currents in the transformer’s neutral
wire was zero or quite low
was
rarely achieved) in a
devices
nected to
were incandescent lighting,
motors,
and other devices that presented linear loading. The result
was an essentially sine-wave
flow in
and
a low neutral
flow at a frequency of
such as TV
fluorescent lighting,
machines, and microwave ovens are commonly drawing
19
Summary of Contents for FINEST 135
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