6
Becoming acquainted with WM5 96
M
easurements of instantaneous variables
THD Measurements
The phase angle (f) between the fun-
damental and the voltage and current
harmonic of the same or
der will be displayed
only if the measurements are taken in a three-
phase system with neutral.
WM5-96 Instruction Manual
The various measuring pages of WM5 96 display the necessary infor-
m
ation for the quality analysis of the network. To scroll (1) the measur-
ing pages, use the “ ” keys; to display the details of the measures,
press the “S” key; to scroll the available details, use the “ ” keys
(3); to exit the details displaying phase, press the “S” key.
T
he details for the instantaneous variables are the following:
dmM= maximum dmd value,
dmd= dmd value,
max= maximum value,
min= minimum value.
For any information on the meaning of “dmd”, see page 14.
Reset of details. Keeping the “S” key pressed for approx. 2 seconds,
it’s possible to reset each variable of the selected detail (dmM, dmd,
max, min). The instrument displays a message confirming the user he
has entered the reset mode: choose “YES” by means of the “ ”
keys , confirm with the “S” key and then select the variable you want
to reset by means of the “ ” keys, then press “S” to proceed with
the reset; to exit the reset mode, keep the “S” key pressed for at least
2 seconds.
Thanks to the powerful calculation capabilities of the ARM® technolo-
gies, WM5 96 allows an accurate analysis of the harmonics up to the
63rd.
Voltage or current value referred to the relevant measured phase.
(V1, V2, V3, A1, A2, A3).
Total harmonic distorsion expressed as a percentage value.
Histogram of the harmonics. To display the details of the harmon-
ics, press the “S” key
(2).
An arrow is displayed on the horizontal axis of the graph to identify the
harmonics being examined. To scroll the harmonics one by one, use
the “ ” keys (2).
Harmonic order (from h1 to h 63), for single phase and the relevant
absolute voltage or current value.
Harmonic order (from h1 to h63), the detected conventional sign
(-,o,+) and its relevant value expressed as a percentage.
Phase angle between the fundamental and the voltage and current
harmonic of the same order: angle between 0° and 90° and
between 270° and 360° corresponds to a generated harmonic, an
angle between 90° and 180° and between 180° and 270° corre-
sponds to an imported harmonic.
To exit the display of measurement details, press the “S” key.
Note: The display of histograms is available only up to the 50
t
h
har-
monic (h50). For the other harmonics from h51 to h63 only the numer-
ic values are available.
f
e
d
c
b
a
1
2
3
1
2
a b
c
d
a
b
d
e
f
c
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