Instruction manual

Contents
1.Application................................................................................................................................5
2.Function and Operation.............................................................................................................5
3.Power Supply............................................................................................................................6
3.1.Grounding Concept............................................................................................................6
3.2.External Supply .................................................................................................................6
3.3.Battery Operation (M68D1)...............................................................................................7
4.Inputs........................................................................................................................................7
4.1.Charge Input ......................................................................................................................7
4.2.IEPE Input .........................................................................................................................7
4.2.1.Switching Off the IEPE Supply .................................................................................9
5.Avoiding Ground Loops............................................................................................................9
6.Amplifier ............................................................................................................................... 10
7.Level Indicators.......................................................................................................................10
8.Low Pass Filter .......................................................................................................................11
9.High Pass Filter.......................................................................................................................12
10.Integrators.............................................................................................................................12
11.Rack Cases for Model M68R1..............................................................................................15
12.Technical Data......................................................................................................................16
Appendix: Limited Warranty
Declaration of Conformity