G.R.A.S. 12HM Instruction Manual Download Page 8 | Manualshive

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G.R.A.S. Sound & Vibration

Power Module Type 12HM - Page 8

Fig. 2.4 Rear panel of the Power Module Type 12HM

AC Mains/line input socket

50 - 60 Hz 35 VA

Mains Voltage

Selector:

230 V AC or

115 V AC

Pull-out fuse box, for 2 fuses,

1 active (innermost); 1 spare

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Summary of Contents for 12HM

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

Page 2: ...Revision 05 12 2012 Power Module Type 12HM ...

Page 3: ... 3 1 2 Preamplifier Voltage Supplies 3 1 3 Input Output 3 1 4 Power Supply 4 2 External Features 5 2 1 Front Panel 5 2 2 Rear Panel 6 3 Operation 8 3 1 Power Supply 8 3 2 Calibration 8 Based on Channel Sensitivity 8 Pistonphone 8 3 3 Measurements 8 4 Service and Repair 10 5 Specifications 11 ...

Page 4: ... for 10 condenser microphones voltage supplies 15V for powering 10 microphone preamplifiers individual response setting Pressure or Free field for each channel individual gain adjustment of 3dB for each channel 1 1 Polarization Voltage Polarization voltages of 200V are supplied via the 7 pin LEMO EGA 307 1B sockets on the front panel 1 2 Preamplifier Voltage Supplies Preamplifier voltage supplies ...

Page 5: ...Module Type 12HM Page 5 1 4 Power Supply The Type 12HM can run from a nominal mains line supply of either 115V AC or 230V AC A voltage tap is provided on the rear panel for selecting one or the other On delivery it is set to 230V AC ...

Page 6: ...mpensating filter in the preamplifier which gives the system a linear free field frequency response at 0 incidence Overload warning LED Lights instantaneously and only while there is an overload synchronised with the one on the preamplifier Type 26HF or Type 26HH Level Adjustment switch and potentiometer On enables the level adjustment potentiometer use a small screwdriver on the potenti ometer to...

Page 7: ...V AC mains line supply Mains Voltage Selector Voltage tap for matching the Type 12HM to the available AC power supply voltage select 230 for an AC mains line power supply of nominally 230V AC or 115 for an AC mains line power supply of nominally 115V AC Fig 2 3 7 pin LEMO EGA 307 1B input socket exter nal view Fig 2 2 Front panel details for each channel of the Power Module Type 12HM Level adjustm...

Page 8: ...ion Power Module Type 12HM Page 8 Fig 2 4 Rear panel of the Power Module Type 12HM AC Mains line input socket 50 60Hz 35VA Mains Voltage Selector 230V AC or 115V AC Pull out fuse box for 2 fuses 1 active innermost 1 spare ...

Page 9: ...tput voltage from the channel is 1 1V or 0 9V the microphone in question is being subjected to 94dB re 20μPa Based on this information proceed as follows 1 Connect the channel output to the analyzer to be used and switch both units on 2 Adjust the analyzer to indicate 94dB re 20μPa for an RMS input of S volts where S is the sensitivity 1 1V Pa or 0 9V Pa see above of the channel in question 3 2 2 ...

Page 10: ...sure Free Field see Fig 2 2 At this point you can make your measurements but keep an eye on the relevant overload warn ing LEDs one on the front panel for each channel and one on the preamplifier to avoid over loading the system and invalidating the measurements Fig 3 1 Pistonphone without its normal coupler and ready to accept the Coupler RA0090 Fig 3 2 Pistonphone fitted with Coupler RA0090 and ...

Page 11: ...ibration Power Module Type 12HM Page 11 4 Service and Repair Repairs should be carried out only by qualified personal The Power Module Type 12HM should not be dismantled with power on because of high voltage circuits ...

Page 12: ...2 5Hz 10kHz 1 0dB 6Hz 20kHz 2 0dB 3 0dB Nominal sensitivity with 1 inch Preamplifier Type 26HF and 1 inch Microphone Type 40EH Channel 1 1V Pa Microphone 110mV Pa with inch Preamplifier Type 26HH and inch Microphone Type 40AH Channel 0 9V Pa Microphone 90mV Pa Microphone polarization voltage 200V Channel separation 20Hz 20kHz 90dB Output impedance 30Ω Output voltage Max 10Vp p Power supply Mains l...

Page 13: ...6 0mm 7 7in Weight 5 5kg 12 1lbs Accessories included Mains line cable Accessories available Type 26HF 1 inch preamplifier Type 40EH 1 inch microphone Type 26HH inch preamplifier Type 40AH inch microphone WEEE directive 2002 96 EC CE marking directive 93 68 EEC Manufactured to conform with RoHS directive 2002 95 EC ...

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