The display will show a bar-graph indicating the position of the “Tape 1
Potentiometer” while at the same time the Stimulus LED will function as a VU
meter indicating tape signal level.
Stimulus LED
as VU Meter
Turn any of the rotary knobs to change the sensitivity.
Adjust the sensitivity to 0-VU on the Stimulus LED (peak indication may
exceed 0-VU occasionally).
The sensitivity level is set electronically thus preventing accidental
alteration and it remains as adjusted even after power is switched off.
Tape 2 Level
Tape 2 is an auxiliary masking channel.
# 18
When this button is depressed, Tape 2 input sensitivity can be adjusted for
either a tape recorder or a CD player.
The display will show a bar-graph indicating the position of the “Tape 2
Potentiometer” while at the same time the Stimulus LED will function as a VU
meter indicating signal level (even though Tape 2 is a masking channel).
Stimulus LED
as VU Meter
Turn any of the rotary knobs to change the signal level.
Adjust the sensitivity to 0-VU on the Stimulus LED (peak indication may
exceed 0-VU occasionally).
5.1.4 SOFTKEYS
The pushbuttons numbered 1 to 5 are designated softkeys because the
function of these buttons changes according to the different modes of the
instrument as well as the different tests.
Softkeys
In the Setup Mode, these pushbuttons select the options shown on the lower
line of the display. Please refer to 4. Test Setup for further details.
In the Test Mode, the softkeys control supplementary functions as described
on the next page.
Softkey 2
In pure tone audiometry, this button controls the Stimulus signal mode. The
mode selected is indicated by the cursor (underscore) on the display just
above the pushbutton.
Pure Tone Test
The available modes are:
C = Continuous Tone Signal
P = Pulsed Tone Signal
W = Warble Tone Signal
PressingSoftkey2whileinpuretonetestingchangestheStimulussignalmode.
Softkey 2
In Free Field pure tone audiometry, Warble is default-selected.
MIDIMATE 622 OPERATION MANUAL
5. Operating in Test Mode
25
