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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

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Содержание 201

Страница 1: ...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 ...

Страница 2: ...NS 4 1 Input connections 4 2 Output connections 4 3 600 Ohm balanced cable 4 B POWER TERMINATION 5 1 AC power cable 5 2 AC input voltage 5 a Fuse table 5 3 AUDIO GND switch 5 C MECHANICAL 5 1 Rack mounting 5 III MAINTENANCE 5 A Introduction 5 B PEAK LED ADJUSTMENT PROCEDURE 5 1 Equipment needed 6 2 Procedure 6 C Input offset adjustment 7 1 Equipment needed 7 2 Procedure 8 IV SPECIFICATIONS 9 TABLE...

Страница 3: ...itions and adjusts the voltage gain from 18dB to 64dB in 2dB steps For reference the 9 o clock position is 30dB the 12 o clock position is 42dB and the 3 o clock position is 56dB 2 TRIM CONTROL The trim control provides 10dB of continuously variable output attenuation In the fully clockwise position the trim is at unity no attenuation In the fully counter clockwise position the trim is at 10dB For...

Страница 4: ...1 Turn the gain control fully counter clockwise turn the trim control fully clockwise and check that the 48V phantom power is off Connect the microphone and then turn on the phantom power if required When sending a signal to a tape recorder that has fixed input levels simply increase the gain until the optimum recording level is reached If the peak indicator flashes red excessively with the gain c...

Страница 5: ...eing used with microphone which produces a positive voltage on pin 2 with positive air pressure on the front of the diaphragm While a vast majority of microphones conform to this standard a few do not Use the phase reverse switch to compensate if necessary 1 2 SHIELD HOT GND OPEN 3 Figure 1 UNBALANCED OUTPUT CABLE TERMINATION 3 The balanced output driver is capable of driving a matched 600Ω line T...

Страница 6: ...ing Do not try to rotate the cam while it is in the power input module Replace the fuses with the proper value selected from the table below Be sure to use a time delay or Slow Blow fuse with a 250V rating Voltage 100V 120V 220V 240V Fuse rating 0 25A 0 25A 0 125A 0 125A Figure 3 FUSE VALUE TABLE 3 In certain installations it may be desirable separate the preamplifier signal ground from the chassi...

Страница 7: ...two thresholds is fixed The procedure for adjusting the red threshold follows 1 EQUIPMENT NEEDED i Sine wave audio signal generator or oscillator output from a mixing console ii Audio level meter or VTVM iii Plastic alignment tool or small screwdriver iv Appropriate interconnect cables v 2 Phillips screwdriver 2 PROCEDURE i With the power off remove the top cover from the 801 Set all of the gain c...

Страница 8: ...ET ADJ VR2 LOCATIONS C INPUT OFFSET ADJUSTMENT The input amplifiers in the 201 are ultra precision laser trimmed devices that have a very low input offset However even the smallest differential offset at the input can result in an audible click when the gain control is turned It should be noted that this type of click will be audible when no signal is present With no signal present there is no sig...

Страница 9: ... moves in the positive direction rotate VR2 in the clockwise direction If the trace moves in the negative direction rotate VR2 in the counter clockwise direction Adjust VR2 until the trace is again on the zero line ix Return the gain control to minimum gain At this point the DC servo may have developed a correction voltage in an attempt to zero the offset generated while at the higher gain Therefo...

Страница 10: ...60dB gain 50 Ω source 130dB PHASE DEVIATION 50 20kHz 2 CROSSTALK 40dB gain 109dB CMRR 60dB gain 3 5Vcm 1kHz 80dB 60dB gain 3 5Vcm 10kHz 97dB Output CMRR 60dB MAXIMUM OUTPUT LEVEL Balanced 28dBu Unbalanced 22dBu IMPEDANCE Input 1600Ω Output 150Ω Minimum Load Impedance 50Ω GAIN RANGE 2dB steps 18 64dB POWER CONSUMPTION 120VAC 60Hz 15 Watts max WEIGHT 6 4 lbs DIMENSIONS 1U rack mount x 10 deep Page 9...

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