Specifications

DigibarPro Version 1.07
Appendix1 10/27/08
4-27
Appendix 2
Quality Assurance Check
To receive the utmost reliability and accuracy from your Digibar Pro, it is recommended that a quality
assurance check be performed periodically. This is a simple task that and will not take long to complete,
but will give the user a high level of confidence in the data collected.
You will need a bucket of water, the calibration certificate at the back of your Digibar Pro Operation
Manual, a reliable thermometer and the Digibar Pro. The use of a calibrated laboratory thermometer is
recommended, but is not necessary. Fill the bucket with fresh water. Choose the water temperature
between 4°C and 30°C. Obtain a copy of the Digibar Pro Calibration Certificate.
Immerse the Digibar Pro Sound Velocity Probe in the bucket containing the water of room temperature.
Acquire a sound velocity reading. Measure the temperature of the water. Find the temperature on the
Digibar Pro Calibration Certificate and read the value under the “RES-VEL” column. Compare the
reading to the actual value on the Digibar Pro. It should be within ± 1 meter/sec of the “RES-VAL” on
the certificate. It may be necessary to allow the transducer to become acclimated to the different water
temperature, so allow two to three minutes for the velocity value to settle. The following is an example of
a Digibar Pro Calibration Certificate.
03/01/2002
STANDARD
DEL
GROSSO
H2O
SERIAL#
98XXX
TEMP VELOCITY MEASURED RES VEL OBS-CAL TEMP VELOCITY MEASURED RES VEL OBS-CAL
FREQUENCY FREQUENCY
4.0 1421.62 1421.4 17.5 1474.38 1474.6
4.5 1423.90 1423.7 18.0 1476.01 1476.2
5.0 1426.15 1426.0 18.5 1477.62 1477.9
5.5 1428.38 1428.3 19.0 1479.21 1479.4
6.0 1430.58 1430.5 19.5 1480.77 1481.0
6.5 1432.75 1432.7 20.0 1482.32 1482.6
7.0 1434.90 1434.9 20.5 1483.84 1484.1
7.5 1437.02 1437.0 21.0 1485.35 1485.6
8.0 1439.12 1439.1 21.5 1486.83 1487.0
8.5 1441.19 1441.2 22.0 1488.29 1488.5
9.0 1443.23 1443.2 22.5 1489.74 1490.0
9.5 1445.25 1445.3 23.0 1491.16 1491.4
10.0 1447.25 1447.3 23.5 1492.56 1492.7
10.5 1449.22 1449.3 24.0 1493.95 1494.1
11.0 1451.17 1451.3 24.5 1495.32 1495.4
11.5 1453.09 1453.2 25.0 1496.66 1496.8
12.0 1454.99 1455.1 25.5 1497.99 1498.1
12.5 1456.87 1457.0 26.0 1499.30 1499.3
13.0 1458.72 1458.9 26.5 1500.59 1500.6
13.5 1460.55 1460.7 27.0 1501.86 1501.8
14.0 1462.36 1462.6 27.5 1503.11 1503.1
14.5 1464.14 1464.3 28.0 1504.35 1504.2
15.0 1465.91 1466.1 28.5 1505.56 1505.4
15.5 1467.65 1467.9 29.0 1506.76 1506.6
16.0 1469.36 1469.6 29.5 1507.94 1507.8
16.5 1471.06 1471.3 30.0 1509.10 1508.9
17.0 1472.73 1472.9