Details: pistonphone 1 1.nominal sound pressure level: greater than equal to 124 db re 20 micro pascal +/-0.2 db at reference condition 2 essential 2. reference condition: ambient pressure: 1013 hpa, essential ambient temp: greater than equal to 20 degree c 3. frequency: nominal: 250hz, satisfied standards: iec 942 (1988) class 1l (class ol with suitable external barometer) essential 4.total harmonic distortion: less than equal to 3% essential 5 5.operating temperature range: -10 degree centigrade to 50 degree centigrade or better 6. power supply: batteries operated 7. the following accessories should be supplied along with essential 6 a)1 inch microphone coupler b)adaptor for 1/2 inch microphone c)adaptor for 1/4 inch microphone d)adaptor for1/8 inch microphone e)correction barometer 8. the pistonphone should be supplied with the calibration chart essential 9.vendor should submit a copy of oem authorization certificate along with the technical bid itself 10.coc should be provided. 11.product d
Sector: Defense