G.R.A.S. 12AQ Instruction Manual Download Page 1

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Instruction Manual

Power Module Type 12AQ

Skovlytoften 33, 2840 Holte, Denmark

www.gras.dk [email protected]

SOUND & VIBRATION

G R A S

. . . .

Summary of Contents for 12AQ

Page 1: ...Instruction Manual Power Module Type 12AQ Skovlytoften 33 2840 Holte Denmark www gras dk gras gras dk SOUND VIBRATION G R A S ...

Page 2: ...Revision 04 12 2019 Power Module Type 12AQ ...

Page 3: ...raditional preamplifiers 4 CCP preamplifiers 4 1 3 Signal Conditioning 5 Gain 5 Input 5 Ouput 5 Polarization voltage 5 Preamplifier supply voltage 5 Syscheck 5 1 4 Power Supply 5 2 External Features 6 2 1 Front Panel 6 Manual Control 6 2 2 Rear Panel 8 3 Internal Features 10 3 1 Battery Compartment 10 ...

Page 4: ...terface 11 4 3 Behaviour 13 4 4 Commands and Responses 13 Setup Commands 13 Special Commands 16 Special Responses 16 4 5 Overload Responses 16 In Latched Mode 16 In Message Mode non latched 16 4 6 Power up down Settings 17 5 Service and Repair 18 6 Specifications 19 7 Optional Accessories 21 ...

Page 5: ...nts as well as for intensity measure ments both in the laboratory and in the field Fig 1 1 The Power Module Type 12AQ 1 2 Salient Features 1 2 1 Traditional preamplifiers For traditional preamplifiers such as Type 26AL or Types 26AJ and 26AH the Type 12AQ provides a voltage supply 15V or 60V for powering up to two microphone preamplifiers a polarization voltage 200V or 0V for two condenser microph...

Page 6: ...further details Note The Ext option provides you have installed a customised signal response net work not factory mounted 1 3 2 Input The microphone signal can enter the Type 12AQ via either of the following input sockets on the rear panel BNC sockets for microphones used with CCP preamplifiers 7 LEMO sockets for microphones used with traditional preamplifiers 1 3 3 Ouput The conditioned output si...

Page 7: ...Module Type 12AQ Page 7 2 External Features 2 1 Front Panel Front panel details are shown in Fig 2 1 2 1 1 Manual Control Manual control is via toggle buttons and rotary switches Green LEDs indicate the current set tings and red LEDs are overload warnings Power and Battery LEDs apart With the exception of Remote the Type 12AQ can be manually controlled via its front panel Remote can be selected on...

Page 8: ...erload detectors an LED indicates the actual overload condition The over load LED will be turned on when an overload occurs Pressing the latch button while no overload LED lights will change the mode to non latched Pressing the latch button while an overload LED is turned on and no overload condition is present will turn off the overload LED if an overload condition is present nothing will happen ...

Page 9: ...ating Polarization 0V button Applies to the Mic Input sockets 7 pin LEMO on the rear panel When activated the polarization voltage for this channel is set to 0V When cancelled it reverts to 200V The polarization voltage is applied to pin 3 Fig 2 3 Preamp 15V button Applies to the Mic Input sockets 7 pin LEMO on the rear panel When activated the supply voltage to the preamplifier of this channel is...

Page 10: ... syschk command CCP Input BNC input socket for driving IEPE transducers such as G R A S CCP Preamplifiers Type 26CB and Type 26CA as well as G R A S Array Microphones Source voltage and current are respectively 28V and 4mA Mic Input 7 pin LEMO input connector for microphone preamplifier Wiring diagram shown in Fig 2 3 Output BNC socket for the output signal via the current settings of the conditio...

Page 11: ...ined within the cabinet of the Type 12AQ To gain access to this first remove the knurled locking screw see Fig 2 2 and slide the baseplate off 3 1 Battery Compartment Fig 3 1 shows the battery compartment after removing the base plate Always use a fresh set of battery cells 6 x LR14 C standard alkaline cells when replacing spent cells making sure that the polarity is as indicated in the battery co...

Page 12: ... is no flow control handshaking therefore commands must be sent one by one waiting for each response The setup of the Type 12AQ cannot be requested The input buffer is 32 bytes in case of overflow a response Buffer overflow will be submitted This will not happen under normal conditions Fig 4 1 shows how the Type 12AQ should be connected to the computer and Figs 4 2 and 4 3 show the relevant dialog...

Page 13: ...G R A S SOUND VIBRATION Power Module Type 12AQ Page 13 Fig 4 2 Selecting the COM port in use e g COM2 Fig 4 3 Showing the correct setup for the selected COM port ...

Page 14: ...in the following About responses 1 All responses are followed by CRLF 3 2 Successfully executed commands respond with OK CRLF 3 Illegal commands respond with an error message e g Error command not found XYZ A where XYZ A is an illegal command argu ment or both For clarity CRLF is implied in the following 4 4 1 Setup commands These are for setting up the signal conditioning requirements and reflect...

Page 15: ...Input socket s on the rear panel Command Effect ccp Incoming signal s expected via CCP Input socket s on the rear panel The LEDs on the front panel will automatically respond to the selected setting Microphone input Switches attention to signal s entering via the Mic Input socket s on the rear panel Command Effect mic Incoming signal s expected via Mic Input socket s on the rear panel The LEDs on ...

Page 16: ...messages will be reported see special command Msg but latched overloads will be cleared when read see special command Ovl Latch y Latch overloads on front panel No effect on overload messages Latch n Cancel latch on front panel No effect on overload messages The LEDs on the front panel will automatically respond to the selected setting Overload hold times and display LEDs The overload hold times a...

Page 17: ...ady Type 12AQ is powered up or restarted OVL on Channel overload is 1 or 2 OVL off Channel overload ceases removed is 1 or 2 4 5 Overload Responses Note The overload system consists of two independent systems a manual user system and a remote controlled system 4 5 1 In Latched Mode For each of the overload detectors an internal overload status flag indicates the actual overload condition The overl...

Page 18: ...wer Module Type 12AQ Page 18 4 6 Power up down Settings Settings are saved apart from exceptions described above when the Type 12AQ is switched off put on standby Settings are restored when the Type 12AQ is switched on restarted ...

Page 19: ...IBRATION Power Module Type 12AQ Page 19 5 Service and Repair Repairs should be carried out only by qualified personal The Power Module Type 12AQ should not be dismantled with power on because of high voltage circuits ...

Page 20: ...k Gain 20dB to 70dB in discrete steps of 10dB Bandwidth For gain from 20dB to 50dB 10Hz to 100kHz 0 1dB 2Hz to 200kHz 0 2dB For gain 60 and 70dB 10Hz to 20kHz 0 1dB Phase matching no filters IEC 1043 same gain setting Inherent noise re input when not dominated by output noise Filter setting Lin HP filter 0 56Hz 20Hz to 20kHz 2µV RMS 20Hz to 200kHz 5µV RMS Other filters 20Hz to 20kHz 10µV RMS 20Hz ...

Page 21: ...etection Fully implemented Interface MSG line SysCheck Output Sinusoidal Frequency 1000Hz Level adjustable 0 5 6V RMS Control interface Interface to host Smart RS232 MSG line Power supplies Internal batteries 6 x LR14 C standard alkaline cells External power 8 18V DC via AB0002 EU or AB0003 USA The appropiate mains line power supply is included Dimensions Height 132 6mm 5 in Width 69 5mm 2 7in Dep...

Page 22: ...LP filter please specify filter frequency and number of poles 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 the specifications and accessories are subject to change ...

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