910-269-EN, Rev. B, June 2011
Adjusting the Pulser/Receiver (Conventional UT Mode) 97
Advanced
Thirty (30) digital filter sets. Total bandwidth allows all frequencies to be
received. Filters not tested to EN12668-1 (see section 4.5.2.2 on page 98).
AxleInspFR
Three digital filter sets. Special filters for unique axle inspection application.
To adjust the filter group
Choose
1/5 > Receiver > Filter Group
, and then vary the setting.
4.5.2
Digital Receiver Filters
The EPOCH 1000 Series has a total instrument bandwidth of 26.5 MHz at –3 dB. The
instrument offers several broadband and narrow-band digital filters. These are
designed to improve the instrument’s signal-to-noise ratio by filtering out unwanted
high and/or low frequency noise outside of the test frequency spectrum. The
Standard
filter set also allows the instrument to provide the dynamic range (dB)
required by EN12668-1.
In most cases, you should select either a broadband filter or a narrow-band filter that
covers the frequency of the transducer being used. Due to the shifting of frequency
spectrum in most materials, it might be necessary to adjust the filter settings to
maximize instrument performance. Every material is different, and you must
optimize the receiver settings based on the application.
Digital filter settings vary based on
Filter Group
(see section 4.5.1 on page 96).
To adjust the Filter
Choose
1/5 > Receiver > Filter
, and then vary the filter
setting.
4.5.2.1
Standard Filter Set
The EPOCH 1000 Series
Standard Filter Set
contains the following seven filters,
compliant with EN12668-1:
•
2.0 MHz to 21.5 MHz (broadband 1)
•
0.2 MHz to 10.0 MHz (broadband 2)
•
0.2 MHz to 1.2 MHz
•
0.5 MHz to 4.0 MHz
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Содержание EPOCH 1000 Series
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