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SPECIAL FEATURES Serial- & parallel port. Very readable displays. Noise free push buttons. 3 fully automatic threshold tests. Storage capacity: 29 audiograms. Calibration without entering the cabinet. Automatic printout of complete audiogram. Narrow band masking. Intensity up to 100 dB. Option of visualizing the audiogram during the test. Technical specifications & Maximum intensities • Frequencies: 11 fixed frequencies from 125 Hz to 8000 Hz. • Hearing Level Range: -10 dB to 110 dB in 5 dB steps. Description of front panel Description of front panel Cont’d 1 Iso hearing level - The actual sound 8 Tone attenuator - Push the pressure in dB DOWN/UP to change soundlevel 2 Frequency - The actual frequency in Hz 9 Tone - Sends tone to the patient 3 Audiogram Identification - The active audiogram 10 AIR - Determines whether the tone is Masking level dB - The actual masking going to the right or left ear level 4 Print - Print the active audiogram 11 Bone - Determines whether the bone Data – Transmits the test results to a conductor is placed at the left or right connected PC side 5 Aut. - Starts 1 of 3 possible tests 12 Frequency - Pushing one of the buttons changes the frequency to the Setup - Enters the setup function (11 next fixed value options) 13 Masking - Masking on/off 6 Shift - Select the “RED” functions 14 Audiogram Identification - Push 7 Clear - Erase audiogram one of the buttons to select which Pulse - Initiates pulse tone at 2.5 Hz audiogram to be active Masking attenuator - Push the DOWN/UP to change masking level Description of back panel 1 Right - Right earphone 2 Left - Left earphone 3 Bone - Bone conductor 4 Response - Patient answer 5 Serial - Connection for PC, or serial printer 6 Printer - Connection for parallel printer 7 On/off - Device on/off 8 Power - Power connector 4.0 Tone attenuator Operation By applying light pressure to the DOWN/UP buttons the attenuator steps up or down in 5 dB. The actual sound pressure can be read in the display Holding down one of the buttons, the sound pressure is increased or decreased until the button is released. Increments: in the range from -10 dB to 110 dB (refer to max. intensities under Technical Specifications). 4.1 Tone When the attenuator is in its lowest position - one step below -10 dB - the display will show minus (-). In this position no data will be stored in memory and should a printout be performed no values will be shown for those frequencies. The first push on the UP button will set the attenuator to 20 dB. If it is decided to store the threshold values shown in the display (see SETUP, MODE 3), it is important not to activate the two attenuator keys before printout, unless a correction of sound pressure is desired. If you want to erase data in an audiogram, which already contains old data: press CLEAR. Operation Cont’d 4.2 AIR With the interrupter button a tone is delivered to the patient. The light will shine as long as the tone is present. It is possible to select fixed tone duration of 0.5, 1.0 or 1.5 seconds. This means that independently of how long the interrupter button is depressed the selected tone duration remains unchanged (see SETUP, MODE 2). The output button AIR determines whether When the L (left) lamp the tone is going to the right or left ear. is on, the tone is sent to the left ear. For each touch of the AIR key, ears are changed. Operation Cont’d 4.3 Bone The output button BONE If the bone conductor is determines whether the tone placed on the left side, is going to the bone the L lamp must be conductor. turned on. The masking channel is automatically connected to the opposite ear and the corresponding light will flash as long as masking is selected. By pressing the BONE button, the bone conductor is connected. For each push of the button, left and right sides are changed. 4.4 Pulse By pushing the PULSE button a pulsing tone with a modulation frequency of 2.5 Hz is emitted. One more push turns off this modulation Operation Cont’d Following symbols will be shown on the screen: X : left ear O : right ear ] : bone conductor left ear [ : bone conductor right ear • masking left ear : D : masking right ear > : bone conductor + masking left ear < : bone conductor + masking right ear 4.5 Frequency Pushing one of the buttons changes the frequency to the next fixed value. The actual frequency can be read in the display Holding one of the buttons down the frequencies is repeatedly changed to lower (DOWN) or higher (UP) values until the key is released Operation Cont’d 4.6 Masking The masking noise used is Narrow Band Noise - effective masking - which automatically follows the frequency of the tone and which automatically is connected to the opposite ear. Pushing the ON/OFF The lamp above button turns on the the button lights masking channel. up. At the same time the lamp above the AIR button will flash with short intervals for the masked channel One more push on the ON/OFF button will disconnect the masking channel and the two lamps will go off. Operation Cont’d By applying light pressure on the If one of the buttons is held DOWN/UP buttons adjusts the down the intensity is attenuator in steps of 5 dB in the automatically adjusted until range from 0 dB to 100 dB. the buttons are released. It is possible to connect the two attenuators in such a way that the masking attenuator - which can be adjusted separately - automatically, follows the tone attenuator 4.7 Audiogram ID Use the SHIFT + ID DOWN/UP The number is shown in buttons, to go through the the ID display audiograms or find one specific test. Operation Cont’d 4.8 Print Use the SHIFT + PRINT The light above the button will light up buttons to print the active during the printing, and the program audiogram to a connected automatically selects the correct symbols. printer. If the printer is not connected or shows an error (e.g. out of paper), the light turns off after a couple of seconds. You may connect most 9 or 24 pin printers or any Epson compatible Bubble Jet printer; in addition you may use a laser printer or a DeskJet printer both in HP emulation mode or an IBM pro-printer. 4.9 Data A push on the DATA button causes the device to transmit the test results stored in the active audiogram to a connected PC. The duration of transmission is about 200 milliseconds. Is a computer connected during the test, the audiogram may be shown directly on the screen: Every push on the DATA buttons will update the results. The software program automatically, selects the correct symbols for left, and right ear as well as for bone and masking. Operation Mode Variable automatic test (VARI selected in setup mode 6) AUT. button is pushed, The frequency is set to 125 Hz and a tone is automatically given to the left ear at an intensity of 30 dB. the intensity will increase 10 dB each time the tone is presented, until the patient signal button is pressed When the software program has accepted the answer, the frequency is automatically changed to the next level and the procedure is repeated until all frequencies have been tested for both the left and the right ear. When the test is completed, the audiometer gives 1 BEEP. If some of the frequencies have not been heard, the lamp above the AUT. button will flash. Press the AUT. button and check the frequencies. The attenuator display will flash for the frequencies not heard. It is possible to conduct a manual test for those frequencies. setup mode 6 4.2.1 Setup To enter the SETUP function, push the SETUP button - the RESPONSE light will flash 5 times and then stay on constant as long as SETUP is active. With the masking attenuator keys it is possible to select 10 different MODES which can be programmed individually. The MODE selected is shown on the masking display. This mode gives the option of selecting or deselecting single frequencies by means of the tone attenuator. One press on the UP button selects the frequency and the TONE lamp will light up. On the other hand, pushing the down button will deselect the frequency and the lamp will be off. The deselected frequencies are not shown in the display after setup is finished. setup mode 6 In this mode fixed tone duration of 0.5, 1.0 and 1.5 seconds may be chosen. The individual tone duration is selected with the tone attenuator buttons and is shown in the frequency display as: OFF, 0.5, 1.0 or 1.5. The fixed tone durations are not affected by the length of time the interrupt button is depressed. If OFF is selected the tone length is controlled manually by pressing the TONE button. setup mode 6 This determines if the test values are stored in the memory. When the UP button of the tone attenuator is pressed the FREQUENCY display may show three values: ON: The memory is active, and all test data are stored for the left and right ear, as well as for the bone conductor & masking. One push of the DOWN button will disconnect the memory function: OFF: The audiometer will operate in the traditional mode. AUTO: Automatic transfer of data to PC screen, each time sound level is changed. Mode 3 has to be selected if an automatic threshold test is performed. setup mode 6 By means of the tone attenuator, the tone and masking signal may be turned off when frequency and channels are changed. When the UP button is pressed the TONE lamp lights up and the signal is automatically turned off each time frequency and channels are changed. One push of the DOWN button will erase this function and the signal will stay on when frequency or channel is changed. In this mode it is possible to connect the masking attenuator to the tone attenuator. One push of the UP button of the tone attenuator connects the two attenuators together and the FREQUENCY display says ON. The masking attenuator may still be adjusted individually in this function. One push of the DOWN button will cancel the function and FREQUENCY display will write: OFF. setup mode 6 You may perform one of the three automatic tests: 20 dB test (20) RANDOM 20 dB test (20r) Variable test (VARI) By pressing the TONE ATTENUATOR UP/DOWN you may choose between these three automatic tests, which are described above. setup mode 6 You have several options choosing printer, and by means of the tone attenuator buttons, a 9 pin or 24 pin printer, an IBM Pro-printer or an HP laserprinter is selected. The type of printer is shown in the frequency display. If an Epson compatible Bubble Jet printer is connected you should select “24”. Using a laser printer or a DeskJet printer in HP emulation mode you should choose “HP”. The IBM Pro- printer is shown as “Pro”.
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