5.5
Harmonics of AC Current in Magnitude (mA or A) or in
Percentage (%)
1)
Turn selector switch (3) to "~mA, ~A oder ~V"
2) Select basic frequency
see 5.7!
via switch(10).
3)
Select ”Harmonic” or ”Ha%” vie key FUNC (6)
Press the
or
button to increment or decrement the order of harmonics in
front of the reading. The number will roll over when the maximum (99) or mini-
mum (1) is reached
4)
at ~mA and A measurement
1) Open the clamp, and close it round the conductor. Make sure that the clamp pro-
perly encircles the conductor, and that there is no air gap between the jaws. For
best measurement results and highest accuracy, have the conductor placed in
center of clamp jaws.
at ~V measurement
1) Plug the black test lead into the "COM" socket and the red lead into the "V
Ω
"
socket
2) Connect the probes to the UUT and read the display
5.6
Total Harmonic Distortion (% THD-F)
1)
Turn selector switch (3) to "~mA, ~A oder ~V"
2) Select basic frequency
see 5.7!
via switch(10).
3)
Select ”THD and %” vie key FUNC (6)
4)
at ~mA and A measurement
1) Open the clamp, and close it round the conductor. Make sure that the clamp pro-
perly encircles the conductor, and that there is no air gap between the jaws. For
best measurement results and highest accuracy, have the conductor placed in
center of clamp jaws.
at ~V measurement
1) Plug the black test lead into the "COM" socket and the red lead into the "V
Ω
"
socket
2) Connect the probes to the UUT and read the display
The total harmonic distortion in percentage (THD %) is defined as following:
%THD
=
+
+ +
100
A
f
A
f
A
f
A
f
N
(
)
(
)
...
(
)
(
)
2
2
3
2
2
1
10
PTDB93570002.qxd:Layout 1 30.05.2008 15:05 Uhr Seite
