Instruction/ maintenance manual of the product 201 Microplane
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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.
I. OPERATIO N ............................................... 2 .... A. FRONT PANEL CONTROL S .......................................... 2 ...... 1. GAIN CONTRO L .................................................. 2 ...... 2. TRIM CONTRO L ...........
Thank you for purchasing the Grace design model 201 microphone preamplifier. It is built to be completely reliable and easy to use. However, there are some important instructions included in this manual. Please take the time to familiarize yourself with the installation and operation of the unit and most problems will be avoided.
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 ∅ ∅ ) reverses the absolute polarity of the music signal at the input of the preamplifier.
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.
PREAMP END 1 3 2 1 3 2 301 RECORDER END Figure 2. 600 Ω BALANCED CABLE TERMINATION B . POWER TERMINATION 1 . A standard AC power cable is included. For safety, it is recommended that the cord be connected to a grounded outlet.
screws that hold each rack ear in place. After removing the rack ears replace the two lower screws on each side of the preamplifier. 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.
iv . Apply power to the generator, preamplifier, then the level meter. v . Adjust the generator output level so that the preamplifier output level is at the desired red threshold. If the proper level can't be reached, adjust the preamplifier gain control.
1 . EQUIPMENT NEEDED i . Oscilloscope with a DC coupled 10mV input range. ii . Unbalanced output cable. (see Figure 1.) iii . Plastic alignment tool or a small screwdriver. iv . #2 Phillips screwdriver 2 . PROCEDURE i . Remove the 12 #6-32 flat head screws from the top lid but leave the lid in place.
IV . SPECIFICATIONS FREQUENCY RESPONSE @ 40dB gain /± 0.2dB 20Hz-300kHz @ 40dB gain /± 3dB 4.5Hz-1.0MHz THD+N @ 40dB gain +20dbu out <.0015% INTERMODULATION DISTORTION @40dB gain +25dBu out <.0025% NOISE - REFERRED TO INPUT @60dB gain 50 Ω source -130dB PHASE DEVIATION 50-20kHz <2° CROSSTALK @40dB gain -109dB CMRR @60dB gain, 3.
An important point after buying a device Microplane 201 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Microplane 201 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Microplane 201 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Microplane 201 you will learn all the available features of the product, as well as information on its operation. The information that you get Microplane 201 will certainly help you make a decision on the purchase.
If you already are a holder of Microplane 201, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Microplane 201.
However, one of the most important roles played by the user manual is to help in solving problems with Microplane 201. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Microplane 201 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
