DMTA-10040-01EN, Rev. E, February 2018
Using the Instrument 227
Figure 5‑151 The web grid display
Absolute measurement
Absolute measurements can be obtained easily with the NORTEC 600 by using its
BNC connector. Absolute signals are useful for monitoring gradual or large
defects, such as erosion, corrosion, fretting wear, bulges, defects at expansion roll,
etc. Although it is possible to apply the above procedure to absolute signals, the
best results are generally obtained using lower frequencies starting at half the
prime frequency. Note that absolute response is generally not recommended for
small defects, such as the flat bottom holes in the calibration standard (tube).
To perform absolute measurements
1. While keeping the foot switch adaptor connected to the NORTEC 600, disconnect
the probe from the foot switch adaptor and connect it to the BNC adaptor
(P/N: DGL-AF4-BNC-8 [U8779886]), which you must then connect to the
instrument.
2. Load the Heat Exchanger Tubing application from the application selection menu
(see step 2).
3. Press the MAIN FILTER menu key ( ) repeatedly until the SPECIAL page is
displayed, and then set the PRB CONN to BNC.
4. Follow steps 1–16 to calibrate the signals.
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