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Reference Manual
00809-1600-4530, Rev AA
Section 3: Verification and Validation of GWR without Fluid
Verification and Validation of GWR without Fluid
Table 3-2. Validation Checks
Description
Initial
reading
Validation
reading
Allowable Tolerance
Reference peak amplitude Normal variation is ±10% mostly depends
on the ambient temperature. If the initial
measurement was performed in one of
the extreme temperature and the
validation measurement is performed at
the other extreme can amplitude differ
20%
Reference peak zero point ± 1 mm
Internal reference pulses See Reference peak amplitude Position:
± 5 mm
Noise floor amplitude 500 mV below surface threshold
Noise floor: any distinctive
peak, distance and
amplitude
See Noise floor amplitude tolerance
Probe end amplitude See Reference peak amplitude
Probe end position Accuracy ± 0.12 in. (3 mm) or 0.03% of
measured distance, whichever is greatest
Ambient Temperature Effect ± 0.008 in.
(0.2 mm)/K or ± 30 ppm/K of measured
value, whichever is greatest
Verification Reflector,
Amplitude, distance, mA
output
See “Reference Peak Amplitude” and
“Probe End Position” tolerance