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2.1.
FRONT PANEL
ON
:
SPL dB
:
UP:
DOWN:
TEST MODE
:
DISTORTION ORDER
:
2.
CONTROLS
Fig. 2. 1.
Front Panel Layout
"V<Il<>l
..
IS
I•11C>h
T~21
1
1
r-----~:--
Test Mode
- - : : - - Distortion Order
--~:---
G2 Stop
- - : : . - - - Return
79 1024
Toggle switch for mains power
.
When switched on, one of the row of
light emitting diodes, labelled SPL dB, below and to the left of the
switch will light
.
To the right of the chart the LED in the RETURN push-
key will light and that of the left READ-IN pushkey will flash.
Displays the selected sound pressure level at which the subsequent
measurement takes place.
Increases the selected test level by one 5 dB increment each time it
is
pressed
.
Decreases the selected test level by one 5 dB increment each time it is
pressed
.
Three position switch to select the test parameter; "Harmonic", "Freq.
Resp." or
"I
ntermod."
Selects
2nd
or
3rd
order distortion when TEST MODE is in either
"Har-
monic" or
"lntermod."
position. Inoperative when TEST MODE is in
"Freq. Resp." position.
9
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