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Robust cabinet
moulded in
hard-
skinned polyurethane foam.
Pre-printed chart on stiff card in A5
format (148 by 210mm
:
5,8 by
8,3 ins). Pre-punched holes locate
chart accurately on the chart bed.
Space for details of test object.
SPL selector determines test SPL.
Light emitting diodes indicate se-
lected sound pressure level.
ON Switch
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Angled control panel and chart bed
for easy operation of the keys and a
clear view of
the
curve
.
Disposable fibre pen, available in
black, red or green.
STOP interrupts the sweep.
RUN
continues the sweep. Warning LED
comes
on if READ-IN process is
prematurely halted because of insuf-
ficient attenuator range
.
2
Rear Panel
CALIBRATE switch and screwdriver
adjusted potentiometer to calibrate
the Microphone
/
Analyzer measure-
ment chain.
Test
mode
switch
.
Selects
"Har-
monic",
"Freq
Resp", or
"lntermod"
test mode.
Selects
"2nd
" or
"3rd"
order distor-
tion measurement
.
G 2 STOP switches off the 2nd gen
-
erator in the INTERMOD mode, to
ensure that a measured value is
valid and not a product of circuit
noise .
RETURN stops the sweep and re-
turns the pen to the stand-by posi-
·
tion.
When
operated
during
READ IN, sets that frequency as the
upper
limit
to
any
subsequent
sweeps.
RUN initiates the test for all meas-
urement modes
.
READ-IN switches must both be op-
erated simultaneously in order to re-
cord a new correction curve
.
This is
to avoid unintentional erasure.
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