Recommended Procedures And Precautions; Calibration Weight Check Procedures - Bowles UW-7 User Manual

Bowles Corporation

Recommended Procedures and Precautions

When using the UW-7 to test ultrasound devices, follow the safety precautions
specified by the ultrasound manufacturer.
 Do not use any coupling medium other than degassed and distilled water.
 Do not spill water on the front or rear panel.
 Do not apply more than 30 W of input power to the UW-7.
 Do not operate the UW-7 for more than 45 minutes to 1 hour before

Calibration Weight Check Procedures

You can check to make sure the UW-7 is operating within proper tolerances using
the 100-gram weight supplied with the unit. The weight supplied is an OMIL
class M1 weight that will weigh between 49.92 and 50.09 or (99.88 and 100.22)
grams. This procedure is NOT a substitute for regular annual calibration by
the manufacturer. No facility should issue an annual calibration sticker for the
UW7 based on having performed only a calibration weight check even if they are
using certified weights (see page 38).
1. The unit should be off at the beginning of this procedure. Remove the cone.
Place the calibration weight adaptor pedestal on the cone-mounting pin. This
provides a stable platform upon which the 100 gram checks weight will be placed.
Calibration Weight
Adapter Pedestal
changing the water (see Preparing the Distilled and Degassed Water on
page 26).
2. Turn the unit on and allow it to warm up for 5 minutes.
3. Press the MODE button until the unit displays in grams.
4. Zero the display.
5. Place the calibration check weight on the pedestal. Allow the
reading to settle down for 5 to 10 seconds. Take the reading.
UW 7
100
Gram Weight
36