MMF M68 Series Operator'S Manual Download Page 1

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Operator’s Manual

Metra Mess- und Frequenztechnik Radebeul

Meissner Str. 58 - D-01445 Radebeul

Phone +49-351-836 2191 Fax +49-351 836 2940

Email: [email protected] Internet: www.MMF.de

Charge

Amplifiers

M68

Series

Summary of Contents for M68 Series

Page 1: ...Operator s Manual Metra Mess und Frequenztechnik Radebeul Meissner Str 58 D 01445 Radebeul Phone 49 351 836 2191 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Charge Amplifiers M68 Series...

Page 2: ...duction 3 2 2 Power Supply 4 2 3 Inputs 6 2 4 Amplifier 9 2 5 Filters 10 2 6 Integrators 12 2 7 Rack Mounting Cases for Model M68R1 14 3 Technical Data 16 Appendix Limited Warranty Declaration of Conf...

Page 3: ...ut selector switch Screws for battery compartment ICP constant current LED 5 level indicator Overload indicator Battery indicator Low pass switch High pass integrator switch Gain switch Fig 1 Front vi...

Page 4: ...ed data acquisition systems The Signal Condi tioners provide the following functions Adaptation of the sensor signal and sensor supply Amplification High and low pass filtering for example anti aliasi...

Page 5: ...jumper J1 in case an AC voltage shall be con nected to the input The input circuit is followed by the first amplifier stage low pass and high pass filters The low pass filter has 6 selectable limitin...

Page 6: ...cket The positive supply terminal is connected to center pin tip The POWER ON OFF switch is located at the rear The M68R1 also has its power supply connector at the rear It is a 4 pole frame connector...

Page 7: ...ry operation as well as for external power supply Fault Protection The instruments are protected against false polarization and short time excess voltage up to 60 V Grounding Conception The inputs and...

Page 8: ...the so called triboelectrical effect Cables with low insulation resistance for example caused by humid connectors reduce the accuracy of measurement at lower frequencies A desirable insulation resista...

Page 9: ...plying the sensor with constant current a positive DC voltage arises over its terminals This static bias voltage depends on manufacturer and specimen and amounts to about 5 through 14 V The sensor sig...

Page 10: ...of Model M68R1 four screws at the side and two at the back are un screwed Jumper J1 is located left at the front side of the printed circuit board Plug it into the position OFF to switch off the cons...

Page 11: ...this is more difficult to realize for the outputs than for the inputs because the following measuring equipment may have single ended inputs If you have the choice to use dif ferential inputs which c...

Page 12: ...rload detector at the integrator input is not pro vided In some cases high level components at higher frequencies may overload the amplifier stage before the integrator while at the integrator output...

Page 13: ...M68 signal conditioners have a high pass filter with a lower limiting frequency of 3 Hz 3 dB By means of this filter low frequency noise can be removed Low frequency noise may occur for example by th...

Page 14: ...rate the measuring signal one or two times Integration can be useful for vibration measure ment by means of accelerometers on rotating machin ery Single integration of vibration acceleration results i...

Page 15: ...n pC g and Bua is replaced by the transducer s charge sensitivity Bqa Example Vibration velocity is measured using an accelerometer with a sensitivity of Bqa 5 pC ms 2 The M68 is operated in the range...

Page 16: ...components with high frequency and magnitude may overload the amplifier although no overload can be detected at the M68 output The over load LED remains dark This can occur due to the at tenuation of...

Page 17: ...68B12 Channels 6 12 6 12 Built in power supply no no yes yes Fig 10 Rack case M68A6 for 6 channels The rack mounting cases without internal power sup plies Model M68A6 and M68A12 have an open rear sid...

Page 18: ...3 Technical Data Measuring inputs Charge and ICP compatible RI 5 M BNC socket single ended ICP sensor supply 3 8 5 6 mA constant current compliance voltage 24 V switched off by internal jumper LED ind...

Page 19: ...40 mm M68D3 7 width units x 3 height units x 190 mm M68R1 Limited Warranty Metra warrants for a period of 24 months that its products will be free from defects in material or workmanship and shall con...

Page 20: ...d that the above mentioned products comply with the demands pursuant to the following standards EN 50081 1 EN 50082 1 EN 61000 3 EN 60950 Responsible for this declaration is the producer Metra Mess un...