GRAS AL0011 User manual

Instruction Manual
Coupler Calibration Stand AL0011
LI0111 – 21 September 2007 www.gras.dk

G.R.A.S. Sound & Vibration
CONTENTS
Coupler Calibration Stand AL0011. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly of Reference Microphone and Preamp. for Calibrating IEC60318 Ear
Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Assembly of the Transmitter Adapter and the sound source microphone . . . . . . 5
Mounting of Transmitter Adapter and reference microphone in AL0011 . . . . . . . . 6
Electrical block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

AL0011
Coupler Calibration
Stand
Cable AA0033
1 m BNC - BNC Coax.
AE0061
BNC plug - BNC socket
90 ° Adapter
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 3
Coupler Calibration Stand AL0011
List of parts (Fig. 1)
Fig. 1 Showing the main parts of the AL0011

GR0371 Sleeve
Slides on in direction
of arrow *)
GR1131
Stop Washer
Type 26AK
Preamplifier
Type 40AG
½˝ Microphone
GR0371
Sleeve
GR1131
Stop Washer
Type 26AK
Preamplifier
Type 40AG
½˝ Microphone
Recess on
this side of
Stop Washer
*)
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 4
Assembly of Reference Microphone and Preamp. for calibrating IEC60318
Ear Simulator
Please pay attention to the mounting of the stop-washer: The recess must face towards the
microphone (Fig. 2).
The black sleeve (GR0371) slides onto the preamplifier from the LEMO-plug side (see arrow).
The stop-washer (GR1131) is mounted between the preamplifier and the microphone (Fig. 3).
Caution: Screw the microphone on/off by gripping only its body not the protection grid. Do not
over tighten. This will ensure that you do not inadvertently unscrew the protection grid when
dismantling the assembly.
Fig. 2 Showing the correct orientation of the Stop Washer and the direction of sliding on
the GR0371
Fig. 3 Showing the correct assembly of the reference microphone and the preamplifier

GR1132
IEC 60318 Calibration
Adapter for AL0011
RA0067
Transmitter Adapter for a
prepolarized microphone
Type 40AO
½˝ Prepolar-
ized Microphone
(sound source)
GR1132
IEC 60318 Calibration
Adapter for AL0011
RA0067
Transmitter Adapter for a
prepolarized microphone
Type 40AO
½˝ Prepolar-
ized Microphone
(sound source)
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 5
Assembly of the Transmitter Adapter and the sound source microphone
This consists of three parts:
Microphone + Adapter + Transmitter (Fig. 4).
Held together by using the microphone as a “nut”.
Fig. 4 Showing parts before assemby
Fig. 5 Showing how the assembled parts are held together by using the microphone as a
“nut”
The Calibration Adapter GR1132 assembled with the Sound Source Microphone (Type 40AO)
and the Transmitter Adapter RA0067 (Fig. 4).
Caution: Use light finger pressure only to stop the microphone from rotating while screwing the
Transmitter Adapter into place. Do not over tighten. This will ensure that you do not inadvert-
ently unscrew the protection grid when dismantling the assembly.

Type 26AC
½˝ Preamplifier
and reference-micro-
phone assembly
IEC 60318 Calibration
Adapter for AL0011
(GR1132)
From Electrostatic Actua-
tor Amplifier Type 14AA
“AC Output”
To Power Module
Type 12AK
“Input”
RA0067
Transmitter Adapter
Calibration plane
DUT
Guide plate
*)
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 6
Mounting of Transmitter Adapter and reference microphone in AL0011
The Calibration Adapter and Transmitter Adapter assembly (shown in Fig. 5) is mounted in the
stand by sliding it down through the ½˝ hole in the calibration plane (in direction of arrow *) then
passing it through the guide plate below.
Mount the BNC - BNC Angle Adapter and carefully slide the guide plate downwards as far as it
will go.
Fig. 6 Showing the AL0011 with device under test (IEC 60318 Ear Simulator) and the
cables leading to additional equipment

IEC 60318
Calibration
Adapter for
AL0011 IEC 60711
Ear Simulator
for calibration
(DUT)
RA0067
Transmitter
Adapter
Swept sine
signal from
generator
(1 V RMS
max.)
Conditioned
output signal
to analyser
Power Module Type 12AK
Used to condition the signal
from the reference micro-
phone in the IEC 60318 Ear
Simulator
Electrostatic Actua-
tor Amplifier Type
14AA
Used to drive the
microphone as
sound source
AA0008
Cable
AA0033
Cable
AA0033
Cable
AA0033
Cable
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 7
Additional parts (not included in AL0011):
• Transmitter amplifier: Electrostatic Actuator Amplifier Type 14AA.
• Transmitter Adapter for prepolarised microphone: Transmitter Adapter RA0067.
• Calibration Kit: IEC 60318 Calibration Adapter for AL0011, RA0183 (incl. Stop Washer
GR1131 and Sleeve GR0371).
• Sound source: ½˝ Prepolarised, Pressure-field Microphone Type 40AO.
• Reference microphone for measuring coupler response: ½˝ Pressure-field Microphone
Type 40AG.
• Preamplifier for reference microphone: ½˝ Preamplifier Type 26AK.
• Signal conditioning and power supply: Power Module Type 26AK
Cables:
• 1 × 7-pin LEMO to LEMO microphone cable (3 m) AA0008.
• 2 × BNC to BNC Coax.cable (1 m) for Power Module Output and Electrostatic Actuator
Amplifier Input (AA0033).
Fig. 7 Showing the AL0011 with device under test and additional G.R.A.S. equipment. Please note:
max. input to Type 14AA is 1 V RMS

Power Module Type 12AK
Electrostatic Actuator Amplifier Type 14AA
Analyser
Sound source microphone Type 40AO
DUT
Reference microphone Type 40AG
Max. 1 Vrms OUT
IN
Transmitter Adapter RA0067 Preamplifier Type 26AK
IEC 60318 Ear Simulator
40 dB
Gain
G.R.A.S. Sound & Vibration
Coupler Calibration Stand AL0011 - Page 8
Fig. 8 Block diagram of a complete set-up
Electrical block diagram