IET Labs 1986 Omnical, User And Service Manual

Page: 16 / 105

8
1986
Introduction
Fig 1-1
Reference
Name Description Position(s) Function
slow
Calibrator generates
continuous 1 kHz tone
bursts, each burst has
200 mS duration every
10 s.
set crest factor
Calibrator generates a
continuous 2 kHz tone at
LEVEL selected. Adjust
with SPL ADJUST knob
to set reference for crest
factor test
crest factor
Calibrator generates a
series of pulses with a
crest factor of “times 3”
9 SPL ADJUST
1 turn continuous
potentiometer
Used in conjunction with
LEVEL control, allows
continuously variable
level from 72 dB to 118
dB in fast and slow mode
or from 75 dB to 111 dB
in crest factor mode
10 Extension cable 61 cm (2 ft) cable
Allows extension of the
transducer assembly
to the instrument being
calibrated
11
Adaptor (supplied
with 1986-9700)
1/2” GR microphone
adapter
12 cavity 1” microphone cavity