Head Phone

39P (AC). B71 (BC)

Power Supply

230V AC transformer, 50Hz

Dimensions

45x 30x 9.5cm

Packing

51x 40x 27cm

Weight

1.775kg

Microphone

Internal

Out put

Air conduction, Bone conduction. Free field

Frequency

AC

BC

125Hz

-10-90HL

-10-45HL

250 Hz

-10- I00HL

-10-45HL

500-750Hz

-10- 120HL

-10-70HL

1000.3000Hz

-10- 120HL

-10-70HL

4000Hz

-10-120HL 

-10-60HL

6000Hz

-10-110HL

-10-50HL

8000Hz

-10-110HL

Masking

Pure tone& with contralateral white noise test

Tests

AC test, BC tests, speech test, speech with noise test

Tone

Continuous pure cone, pulse tone, warble tone

Precision

Sound pressure:± 1 dB,

Frequency

better than 1%

Distortion

Air conduction: ≤2.5%, Bone conduction: ≤5%