Product Description

AD***4 can conduct all standard hearing-aid test, Language hearing test and all special test that depend on structure.

The design of AD-**4 is on the base of a advanced *4 pixels digital signal processing,can produce high quality signal,andown prodigious refractivity.

Easy operation process.Can show the current condition clearly. and selector are all type of low noise.The voice level,frequency and other information could be showed on the display clearly.Language signal can be provided by internal or external microphone.It has a function:when testing language hearing, masking signal and language signal can be provided to the ears at the same time,that is noise language testing.

There have 3 output option:standard earphone(AC),bone conduction(BC) and special output(SF),can be connected to free area megaphone or inserted earphone.

AD***4 can calibrate multiple types of earphone at the same time.

AD***4 can be use as mobile devices,and also as desktop.

AD***4 use keyboard to intall and operate,so it’s very easy to handle.

Display:

There are two output LED on both side of the disply,when the selected detection signal transfer to corresponding ear,the screen would show.During the audio detection,the up line of the display would show the strength that provide to left or right ear by dBHL ration.

When testing,the test ear would show“L” or “R” on the disply. Test frequency would show in the middle of the screen.If cover the opposite ear,it will show in the opposite side.

AD***4 Technical Index：

Channel:Two independent channel

Frequency: Air conduction; Bone conduction and free sound field *1 standard frequency,*******0Hz,bone conduction *******0Hz,error less than 1%.

Masking:Pure tone test ;ipsilateral white noise

Sound pressure range: