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70
V5.1
‐
March
2010
Hamming
This is a good window for resolving frequencies
that are very close to the same value with
somewhat improved amplitude accuracy over the
rectangle window. It has a slightly better frequency
resolution than the Hanning selection.
Use Hamming for measuring sine, periodic, and
narrow band random noise. This window works on
transients or surges where the signal levels before
and after the event are significantly different.
Hanning
This is a good window for amplitude accuracy but
less so for resolving frequencies.
Use Hanning for measuring sine, periodic, and
narrow band random noise. This window works on
transients or surges where the signal levels before
and after the event are significantly different.
Blackman
This is the best window for measuring the
amplitude of frequencies but least useful for
resolving frequencies.
Use Blackman-Harris for measuring predominantly
single frequency waveforms to examine higher
order harmonics.
Fig 42, 43, 44, 45 show four types of window functions referring to a sine wave of
1KHz.
Summary of Contents for HOS-MS420
Page 11: ...10 V5 1 March 2010 FRONT PANEL AND KEYPAD OVERVIEW Figure 3 ...
Page 32: ...31 V5 1 March 2010 Figure 20 AC Coupling ...
Page 72: ...71 V5 1 March 2010 Fig 42 Rectangle window Fig 43 Blackman window Fig 44 Hanning window ...
Page 79: ...78 V5 1 March 2010 ...
Page 85: ...84 V5 1 March 2010 Figure 4 Continuity Test ...
Page 89: ...88 V5 1 March 2010 ...
Page 91: ...90 V5 1 March 2010 Figure 10 400mA AC Current Measurement ...
Page 95: ...94 V5 1 March 2010 ...