Fluke 6105A - Interharmonic Specifications; Dip;Swell Specifications; Determining Non-Sinusoidal Waveform Amplitude Specifications

6100B/6105A
Users Manual
1-22
1-54.
Interharmonic Specifications
Interharmonics are available on voltage and current outputs
Frequency accuracy
±500 ppm
Amplitude accuracy 16 Hz to <6 kHz
±1 %
Amplitude accuracy >6 kHz 4 %
Maximum value of a single interharmonic
The maximum value for an interharmonic <2850 Hz is 30 % of
range. See “Amplitude/Frequency Limits” for profile above 2850
Hz.
Frequency range of interharmonic 16 Hz to 9 kHz
1-55. Dip/Swell Specifications
Although Dips and Swells are primarily voltage phenomena, the 6100B provides the same facility on its current
output.
Trigger-in requirement
TTL falling edge remaining low for 10 μs
Either:
Trigger-in delay
OR
Phase-angle synchronization with respect to
channel fundamental frequency zero crossing
0 to 60 s ±31 μs
±180 ° ±31 μs
Dip/Swell Min duration 1 ms
Dip/Swell Max duration 1 minute
Dip Min amplitude 0 % of the nominal output
Swell Max amplitude The least of full range value and 140 % of the nominal output
Ramp up/down period
Settable 100 μs to 30 s
Optional repeat with delay
0 to 60 s ±31 μs
Starting level amplitude accuracy
±0.025 % of level
Dip/Swell level amplitude accuracy
[1]
±0.25 % of level
Trigger out delay
0 to 60 s ±31 μs from start of dip/swell event
Trigger out
TTL falling edge co-incident with end of trigger out delay, remaining
low for 10 μs to 31 μs
[1] Accuracy not specified below 10 % of starting level or below the range minimum value.
1-56. Determining Non-sinusoidal Waveform Amplitude Specifications
The rms value of the combination of voltage components is:
∑
=
=
N
i
iRMS
VV
1
22
and, assuming symmetrical uncertainties,
i
Vu )( , for each of
i
V ,
Note that the uncertainties of the components of a 6100B non-sinusoidal voltage (or current) waveform are
correlated so must be combined by linear addition.
=+
2
))((
RMSRMS
VuV
2
1
))((
∑
=
+
N
i
ii
VuV
=++ )()(2
22
RMSRMSRMSRMS
VuVuVV
)()(2)()(2
2
2
22
2
21
2
11
2
1
VuVuVVVuVuVV +++++ ...
nnnn
VuVuVV
22
)(2+
But
∑
=
=
N
i
iRMS
VV
1
22
,
and, where uncertainties are relatively small (as in the 6100B), u
2
v
i
components become negligible. The uncertainty
of the combined waveform becomes:
=)(2
RMSRMS
VuV
)(2)(2
2211
VuVVuV + ...
)(2
nn
VuV
which simplifies to give
c
u as the combined uncertainty: