Measuring with the Gauge
35
CONTROLS
The Cygnus 1 ROV Gauge has no controls accessible to the user
Switching the instrument on
The instrument turns on immediately that there is power connected.
There will be an initial delay of about 2 seconds, and then the instrument will begin
continuously transmitting thickness-measurement data
Switching the instrument off
The instrument is switched off by disconnecting the power
Calibration
Calibration adjusts the Gauge Sound Velocity setting for the material under test.
The Cygnus 1 ROV Gauge does not have an on-board Calibration facility – instead
Calibration is achieved using the CygLink Remote Display software, which has a range of
Calibration options.
See Calibrating the Gauge,
on page 36
A Guide to Sound Velocities
can be found on page 43
¾ Cygnus 1 ROV Gauge has a on-board high-accuracy crystal oscillator, which is preset
for a Sound Velocity of 6400 m/s
The Calibration is stable and there is no warm-up time.
¾ There is no zero-adjustment since the multiple-echo technique zeros automatically – the
timing starts when the first echo is received.
¾ There is no ‘ranging in’ since the straight beam path of the single-crystal Probe ensures
that the timing is related to the thickness – the linearity is perfect.
¾ Calibration is vital : whenever a reading is suspect, check that the test material is the
same as the one for which the instrument has been Calibrated.
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