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LI0104 – 15 Ma

y 2019

Instruction Manual

12AA 2-Channel Power Module with gain, filters and
SysCheck generator

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Summary of Contents for 12AA

Page 1: ...LI0104 15 May 2019 Instruction Manual 12AA 2 Channel Power Module with gain filters and SysCheck generator ...

Page 2: ...Revision 20 05 2019 Power Module Type 12AA ...

Page 3: ...4 SysCheck System Check 6 1 5 Power Supplies 6 1 6 Input Output 6 2 External Features 7 2 1 Front Panel 7 2 2 Rear Panel 8 3 Internal Features 9 3 1 Battery Pack 9 3 2 User servicable Switches 9 4 Operation 11 4 1 Batteries and External Power 11 4 2 Polarization Voltage and Preamplifier Voltage 11 4 3 Filter Settings and Direct Mode 11 4 4 SysCheck System Check 11 5 Service and Repair 12 6 Specifi...

Page 4: ...or powering up to two microphone preamplifiers a choice of signal conditioning A block diagram of its main components is shown in Fig 1 2 1 1 Polarization Voltage The polarization voltage can be set to either 0V or 200V via an internal switch see section 3 2 Use 0V for prepolarized microphones and 200V for externally polarized microphones default setting 1 2 Preamplifier Voltage Supplies The pream...

Page 5: ...G R A S Sound Vibration Power Module Type 12AA Page 5 Fig 1 2 Block diagram of the Type 12AA ...

Page 6: ...AA has a built in 1000Hz SysCheck generator for verifying the stability of the com plete measuring system including the microphone The signal level from the generator can be pre adjusted before it is applied to the measurement set up A system check can be activated locally via a push button on the front panel or remotely via a Mini Jack socket on the rear panel SysCheck or similar technique can be...

Page 7: ...he Preamplifier Input socket Adjustment is individual for each channel and ranges from 0 to 5 6V RMS Preamplifier Input Channels In A In B 7 pin LEMO input connector for microphone preamplifier Wiring diagram shown in Fig 2 2 Gain switches and Overload LEDs In A In B Adjust the gain of each channel attenuator amplifier individually to suit requirements and without overloading the input circuits Ov...

Page 8: ...sCheck start Apply a DC voltage of 4 9V e g from the RS232 output of a computer to activate the SysCheck generator centre pin terminal Ouput channels Out A Out B BNC socket for the output signal either via signal conditioning or directly from the micro phone preamplifier Locking screw Unscrew to remove baseplate and gain access to internal setting switches Fig 2 3 Rear panel of the Power Module Ty...

Page 9: ...Fig 3 2 Filter selection applicable to both channels disabled if Direct mode is selected 3 posi tion signal conditioning switch Lin routes the signal through the amplifier alone H P routes the signal through the amplifier and the 20Hz high pass filter e g to supress infra sound A w routes the signal through the amplifier and the A weighting network Direct mode select 2 position switch one for each...

Page 10: ... switches of the Power Module Type 12AA Filter selection Linear High Pass A weighting Ch B Direct mode Amplifier mode Ch A Direct mode Amplifier mode Polarization voltage 0V 200V Supply voltage 120V 28V Note Switch off the Power Module before chang ing any preamplifier power settings ...

Page 11: ...se the dynamic range will be determined by the Type 12AA which should be switched to its Direct mode section 3 2 or its Gain switched to 20dB to avoid overload 4 3 Filter Settings and Direct Mode There are three internal slide switches section 3 2 two for selecting Dir Direct or Ampl Amplifier mode for the two channels and one for selecting which Amplifier mode viz a Lin linear b A w A weighting o...

Page 12: ...ibration Power Module Type 12AA Page 12 5 Service and Repair Repairs should be carried out only by qualified personal The Power Module Type 12AA should not be dismantled with power on because of high voltage circuits ...

Page 13: ...kHz 3 0dB Channel separation 20Hz 20kHz 65dB Inherent noise 20Hz 20kHz with input grounded A weighted 1µV Lin 1 6µV 20Hz 20kHz with G R A S preamplifier and 20pF dummy microphone A weighted 3 2µV Lin 5 7µV values valid for 20dB and 40dB gain re input A weighting filters Compliant with IEC 60651 Type 0 High pass filter 3 pole Butterworth 1dB at 20Hz Output impedance 30Ω Power supply 10 x LR6 AA sta...

Page 14: ...34 6mm 1 3in Depth 196 0mm 7 7in Weight 770g 1 69lbs Accessories included Mains line adapter Europe AB0002 USA AB0003 Accessories available AK0040 19 inch Rack mounting System WEEE directive 2002 96 EC CE marking directive 93 68 EEC Manufactured to conform with RoHS directive 2002 95 EC G R A S Sound Vibration continually strives to improve the quality of our products for our customers therefore t...

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