needle hydrophone data:
- 202240140: linearity scan of 1 MHz transducer 39 mm diametre from 5 to 100 V in 5V steps, at distance of 180mm
- 202240141: scan of the field parallel to the transducer face at 180mm for 1MHz, 39mm diametre transducer
- 202340001: linearity scan of 1 MHz transducer 25 mm diametre from 5 to 100 V in 5V steps, at distance of 110mm
- 202340002: scan of the field parallel to the transducer face at 110mm for 1MHz, 25mm diametre transducer
- 202340003: linearity scan of 2.5 MHz transducer 39 mm diametre from 5 to 100 V in 5V steps, at distance of 210mm
- 202340004: scan of the field parallel to the transducer face at 210mm for 2.5MHz, 39mm diametre transducer
