IEC61000-3 S
OFTWARE FOR
W
INDOWS
U
SER
M
ANUAL
R
EFERENCE
I
NFORMATION
Voltech Instruments
VPN 98-025/7
Page 81
6.5.
IEC61000-3-2 2001
HARMONICS TEST DURATION
The 'test observation period', Tobs is defined by section 6.2.4. of the
standard.
The key criterion used to determine the observation period being that Tobs
(is) 'of sufficient duration to meet the requirements for repeatability'.
Type of equipment
behaviour
Observation Period
Voltech
recommendation
Quasi-stationary Sufficient
duration
to
meet the requirements
for repeatability
10 secs.
Short cyclic
(Tcycle < 2.5 min)
> 10 cycles (reference
method) or sufficient
duration to meet the
requirements for
repeatability
The cycle of operation
of the equipment plus a
few seconds.10 secs.
minimum
Random Sufficient
duration
to
meet the requirements
for repeatability
2.5 minutes and check
repeatability
Long cyclic
(Tcycle > 2.5 min)
Full equipment
program cycle
(reference method) or a
2.5 minute period
considered…..the
operating period with
the highest THC
Full equipment
program cycle. 2.5
minutes minimum.
If in doubt, run at least two tests and check the repeatability.
For 'Long cyclic' equipment a full equipment cycle test can be run and
period containing the highest THC determined (see 'Other data plot').
Repeat testing of equipment could than be tested using a 2.5 minute
duration centred on the point when the equipment produces the highest
THC.
Summary of Contents for PM3000ACE
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