Grace m201mk2 Скачать руководство пользователя страница 9

Страница: 9 / 13

grace design m201

mk2

owner’s manual

1. Remove the 14 phillips head screws from the top lid but leave the lid in place.
2. Turn on the preamplifier and allow to warm up for at least 45 minutes. (go get a nice cup of

coffee and do some stretches)

3.  Set all of the preamplifier gain controls to minimum (fully counter clockwise).
4.  Set all +48V, polarity reverse, pad, and ribbon mode switches to OFF
5.  Remove the top lid and locate the DC offset test points TP7 and TP8 (figure 3) on the channel

to be adjusted. Place the Volt meter probes into these holes and note the DC Volts. It should

be in the range of +/- 0.02V.

6. Rotate the gain control to maximum (fully clockwise) and note the DC Volts.
7. Locate DC offset potentiometer VR1 and rotate it for a reading that matches the minimum

gain reading. +/- 0.005V.

8. The objective is to get the minimum gain offset and the maximum gain offset to match as

closely as possible.

9. The input offset does drift with temperature and having the lid off will allow the circuitry to

cool. It is advisable to replace the lid and let the preamplifier warm up again (about 20 min-

utes) and then re-check your adjustments.

R29

R31

D15

R19 C16

D16

+48V

C15

C18

R24

CAL

R34

R36

R37

C37

R39

R58

TP1

TP2

GND

TP3

TP5

R21

C17

D10

R23

R25

R27

R32

D11

C29

C35

R38

C36

R45

TP9

D13

C41

R48

R49

R50

R51

R52

D18

R54

C46

R55

R56

R57

R59

C44 J4

C47

-18

-15

R7 R9

TP8

R18

TP7

C22

R22

C25

R30

R28

R35

C38

R44

C39

R53

D19

C45

E -

C10

R17

C19

R11

R13

R15

VR1

C14

R46

C49

C11

-15V REG

+15V REG

R16

TP6

TP4

C13

C21

C24

C23

METER

CAL

R10

VR2

R14

R12

C20

C28

C26

C32

R41

C33

C34

U10

C40

U11

AUTO

+10dB

D12

C42

R43

D17

D14

TP10

+5V

+15

+18

R20

C48

R26

C30

R33

C27

C31

R40

R47

R42

GAIN

C43

OFFSET

+48V

OFFSET

AT211 Rev

VR1

DC OFFSET CAL

TP7-TP8

DC OFFSET

TEST POINTS

+10dB GAIN / AUTO

VR2

PEAK LED CAL

figure 3

- offset test point and peak LED adjust trimpots

Содержание m201mk2

Страница 1: ...Owner s Manual Rev A All contents Grace Design Lunatec LLC 303 823 8100 www gracedesign com 2 Channel Microphone Preamplfier m201mk2 ...

Страница 2: ...o please do not hesitate to contact us directly if you have any questions comments or concerns with your new m201mk2 microphone preamplifier Thanks for reading and happy recording The Grace Design Team Contents Welcome 2 Important Safety Information 3 GENERAL 3 SAFETY MARKING SYMBOLS 3 CALIFORNIA PROPOSITION 65 WARNING 3 SERVICE INFORMATION 3 Front Panel Controls 4 Rearpanel Connections 5 Installa...

Страница 3: ...suitable for continuous operation Weight 4 6lbs 2 1kg SAFETY MARKING SYMBOLS CAUTION READ ACCOMPANYING DOCUMENTS This symbol located on the equipment and in this manual refers to important instructions Read this manual thoroughly before operating this equipment WARNING ELECTRICAL SHOCK HAZARD This symbol located on the equipment and in this manual indicates the potential for electrical shock hazar...

Страница 4: ...TCH The phase reverse switch reverses the absolute 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 This eliminates signal wiring to the front panel and switch contact performance problems E 20 PAD SWITCH The 20dB attenuator switch attenuates the input signal 20dB ...

Страница 5: ... additional recording devices or mixers C XLR MIC INPUT CONNECTOR Input connections are made via female XLR con nectors with pin 2 positive pin 3 negative and pin 1 ground 48V phantom power is supplied on pins 2 and 3 Installation POWER CONNECTION The m201mk2 has a built in universal power supply which accepts line voltages of 100 to 240VAC We include power cable specified for the country where it...

Страница 6: ...e output is to be used unbalanced pin 1 should be connected to signal ground and pin 2 to signal hot Due to the nature of the balanced output stage pin 3 should be left open for unbal anced operation See the following figure 1 1 2 3 SHIELD HOT GND OPEN XLR MALE figure 1 Unbalanced output cable termination Preamplifier Operation SETTING THE GAIN First turn the gain control fully counter clockwise a...

Страница 7: ...apacitors are relay bypassed to further simplify the m201mk2 s signal path Incidentally the ribbon mode works very well with lower output dynamic microphones as well It is not recommended to use Ribbon Mode and the 20dB pad at the same time This will cause the microphone to see a variable input impedance and will cause a low frequency response bump of up to 10dB depending on the microphone output ...

Страница 8: ... through 8 10 If it is desired to calibrate the peak indicator to a specific AD converter input level simply con nect the output of the preamplifier to the converter Adjust the signal generator so that the desired peak level is indicated on the converter and then adjust VR2 until the peak LED is be tween green and red INPUT OFFSET ADJUSTMENT The input amplifiers in the m201mk2 are ultra precision ...

Страница 9: ...ible 9 The input offset does drift with temperature and having the lid off will allow the circuitry to cool It is advisable to replace the lid and let the preamplifier warm up again about 20 min utes and then re check your adjustments R2 R6 D7 R29 R31 D15 R5 R19 C16 D9 D16 48V C7 C5 R8 D4 C15 C18 R24 CAL U6 U7 R34 R36 R37 C37 R39 R58 TP1 R1 TP2 GND 1 R3 TP3 D1 TP5 D2 C6 C8 J2 Q1 U4 D5 D3 R21 D8 C1...

Страница 10: ...g 130dB 40dB gain 150Ω source 22 22kHz 125dB 40dB gain 150Ω source A weighting 128dB 20dB gain 50Ω source 22 22kHz 117dB 20dB gain 50Ω source A weighting 120dB 20dB gain 150Ω source 22 22kHz 117dB 20dB gain 150Ω source A weighting 119dB GAIN RANGE Default Mode 18 64dB 2dB steps Ribbon Mode 28 74dB 2dB steps PHASE DEVIATION 40dB gain 40Ω source 75Hz 45kHz 3 CROSSTALK Any Channel 40dB gain 1kHz 140d...

Страница 11: ...grace design m201mk2 owner s manual 11 254mm 10 00in 428mm 16 84in 20mm 80in 274mm 10 80in 483mm 19 00in 43mm 1 70in Dimensions ...

Страница 12: ...ve workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number Customers within the US are responsible for all inbound freight charges to Grace Design s facility while Grace Design will pay for return freight charges via ground service Customers outside the US must contact their distributor for warranty product retu...

Страница 13: ...grace design m201mk2 owner s manual 13 Manual Revisions Revision Page Change Date Initials A all initial release 04 29 20 edg ...

Результаты поиска

Содержание m201mk2

Отзывы:

Похожие инструкции для m201mk2

Бренды по названию

Популярные бренды

Grace m201mk2, Руководство пользователя

Результаты поиска

Содержание m201mk2

Отзывы:

Похожие инструкции для m201mk2

Бренды по названию

Популярные бренды