User Manual
SONO-MIX MINI Version 2_7
2017-05-12
Page 38
7.1.10. Basic Balancing in Air and Water
SONO probe heads are identical and manufactured precisely. After an exchange of a probe head it is
nevertheless advisable to verify the calibration and to check the basic calibration and if necessary to
correct
it with a “Basic Balancing”.
With a
“Basic Balancing” two reference calibration measurements are to be carried out with known set-
points ("RefValues"). For the reference media, different calibration materials are used, dependent on the
SONO probe type. For SONO probes with a ceramic measurement window, air and water (tap water) is
used. For other SONO probes like SONO-GS1 glass beads are used for basic calibrations (on request).
Attention:
Before performing a “Basic Balancing” it must be ensured that the SONO
probe was set to
“Measure Mode” A. If this is not assured, the probe returns zero values.
After a “Basic Balancing” the SONO probe has to be set to “Measure Mode C” again,
because otherwise the probe would not measure continuously!
In the menu
"Calibration
" and the window "
Basic Balancing
" the two set-point values of the radar time
tp
are displayed with 60ps and 1000ps.
1. Reference set-point A:
tp
=60ps in air (the surface of the probe head must be dry!!)
The first set-point can be activated with the mouse pointer by clicking to No.1. By activating the
button "
Do Measurement
" the SONO probe determines the first reference set-point in air. In the
column „MeasValues“ the measured raw value of the radar time
t
is displayed (e.g. 1532.05
picoseconds).
2. Reference set-point B:
tp
=1000ps in water. The SONO probe head has to be covered with
water in a height of about 50mm. The second set-point can be activated with the mouse pointer
by clicking to No.2. By activating the button "
Do Measurement
" the SONO probe determines
the second reference set-point in water.
In the column „MeasValues“ the measured raw value of
the radar time
t
is displayed.
3.
By activating the button „
Calculate Coeffs
“ and „
Coeffs
Probe
“ the alignment data is
calculated automatically and is stored in the SONO probe non-volatile.
With a “Test run” (in
Mode A) the radar time
tp
of the SONO probe should be now 60ps in air and 1000ps in water.
