| Type |
Manufacturer |
Characteristics |
Type approval sign |
| 4228 |
Brüel & Kjaer |
Mechanic drive (Pistonphon);
Class 1L ; 124 dB at 250 Hz |
21.5 - 92.02 |
| 4231 |
Brüel & Kjaer |
Electrodynamic drive, controlled;
Class 1; 94 dB and 114 dB at
1000 Hz |
21.5 - 93.03 |
| 1251 |
Norsonic-Tippkemper GmbH |
Electrodynamic drive, controlled; Class 1;
114 dB at 1000 Hz |
21.5 - 94.04 |
| 4226 |
Brüel & Kjaer |
Piezoelectric drive, controlled;
Class 1; 94 dB at 250 Hz and
1000 Hz |
21.5 - 97.05 |
| CAL01 |
01dB |
Electrodynamic drive, controlled;
Class 1; 74 dB, 94 dB and 114 dB at 1000 Hz |
21.51 - 00.01 |
| CAL02 |
01dB |
Electrodynamic drive, controlled;
Class 2; 94 dB at 1000 Hz |
21.52 - 00.02 |
| CR:511F |
Cirrus Research |
Electrodynamic drive, controlled;
Class 1L; 94 dB at 1000 Hz. Accessories: Barometer |
21.51 - 00.02 |
| 5002 |
Mikrotech Gefell |
Mechanic drive (Pistonphon),
Class 1L; 124 dB at 250 Hz |
21.51 - 00.03 |
| 42AA |
G.R.A.S. Sound&Vibration AS |
Mechanic drive (Pistonphon),
Class 1L; 114 dB at 250 Hz |
21.51 - 01.01 |
| CAL200 |
Larson Davis |
Electrodynamic drive, Class 1;
94 dB and 114 dB at 1000 Hz |
21.51 - 01.02 |
| NC-74 |
RION |
Electromechanic Drive;
Class 1; 94 dB at 1000 Hz |
21.51 - 01.03 |
| CAL 21 |
01dB-Stell |
Electromechanic Drive;
Class 1; 94 dB at 1000 Hz |
21.51 - 03.01 |
| CB-5 |
CESVA |
Electrodynamic Drive, Class 1L;
94 dB at 1000 Hz;
Accessories: Barometer |
21.51 - 05.01 |
