Related Manuals for Grace 201
Summary of Contents for Grace 201
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Page 1: Owners Manual
OWNERS MANUAL MODEL 201 MICROPHONE PREAMPLIFIER PO Box 204 Boulder, CO. 80306 303.443.7454 fax: 303.444.4634 Revision C March, 2000 © Copyright 1996, Lunatec LLC... -
Page 2: Table Of Contents
I. OPERATION ..........A. -
Page 3: Operation
Grace Design has been building professional audio products for the recording industry for over ten years. During this time the model 201 has evolved through a process of extensive listening, testing and refinement. We hope it helps you achieve a new level of excellence. -
Page 4: Phase Reverse
off, the LED will illuminate if voltage is being fed from an external source. (i.e. when using a direct split in a remote recording application.) 4. PHASE REVERSE The phase reverse switch (labeled polarity of the music signal at the input of the preamplifier. The switch illuminates green and provides power for a sealed gold contact relay located on the preamplifier circuit board. -
Page 5: Installation
level before the trim control, preamplifier overload can be avoided. It is best to leave the trim control fully clockwise for normal recording operations. II. INSTALLATION A. AUDIO TERMINATIONS 1. Input connections are made via female XLR connectors with pin 2 positive, pin 3 negative and pin 1 ground. -
Page 6: Power Termination
EARTH to ISO. C. MECHANICAL 1. The model 201 can be rack mounted in a standard 19" equipment rack. If desired the rack mount ears can be removed by removing the 3 #6-32 flat head... -
Page 7: Maintenance
III. MAINTENANCE A. The model 201 was designed to be maintenance free for many years. It is highly unlikely that your unit will require service. However, there are two adjustments that may need to be made from time to time. -
Page 8: Input Offset Adjustment
With no signal present there is no signal amplitude to be changed unless input offset is present. The DC servo circuit in the 201 corrects any DC errors that appear at the output of the instrumentation amplifier stage. It can not correct the very small offset at the inputs. -
Page 9: Equipment Needed
Set all of the preamplifier gain controls to minimum. Set the trim controls to maximum. Turn on the 201 preamplifier and the oscilloscope and allow to warm up for at least 45 minutes. iii. Connect the output cable from channel 1 of the preamplifier to the oscilloscope input. -
Page 10: Iv.specifications
IV.SPECIFICATIONS FREQUENCY RESPONSE @ 40dB gain /± 0.2dB @ 40dB gain /± 3dB THD+N @ 40dB gain +20dbu out INTERMODULATION DISTORTION @40dB gain +25dBu out NOISE - REFERRED TO INPUT @60dB gain 50 source PHASE DEVIATION 50-20kHz CROSSTALK @40dB gain CMRR @60dB gain, 3.5Vcm, 1kHz @60dB gain, 3.5Vcm, 10kHz...