MKH 20...70
04/2005
Test instructions
Measuring and test equipment
1 AF generator, output voltage 1V
1 AF voltmeter, 10mV range
1 oscilloscope
1 handheld multimeter, range 2V
DC
1 capacitance meter, 0 to 100pF
1 ohmmeter, range 20M
Ω
1 headphones
Measuring set-up
Test procedure
Circuit test MKH20/MKH30/MKH40/MKH50:
쐃
Operating voltage microphone:
Check voltages between R22 or R23 and ground; desired value = +41V;
both voltages have to be identical.
If the no-load voltage of the phantom supply device is not 48V, the deviation
from the desired value has to be identical.
쐇
Current consumption microphone:
Check voltages via R20 and R21; desired value in each case = 3.3V
(corresponds to a current of 1mA in each case);
both voltages have to be identical.
쐋
Balancing:
Check the voltage between the measuring points A(+) and B(-);
desired value = 0V
If the value is not 0V, rotate the coil core of L1 until the voltage is 0V.
쐏
Operating voltages output stage:
Check voltage via D6; desired value = 9V
Check voltage via D8; desired value = 8V
쐄
Operating voltage oscillator:
Check voltage via C4; desired value = +28.5V
Device
under test
phantom
supply
amplifier
48 V
oscilloscope
voltmeter
headphones
Summary of Contents for MKH 20
Page 16: ...MKH 20 P 48 16 53 04 2005 MKH 20 circuit diagram ...
Page 22: ...MKH 30 P 48 22 53 04 2005 MKH 30 circuit diagram ...
Page 28: ...MKH 40 P 48 28 53 04 2005 MKH 40 circuit diagram ...
Page 31: ...MKH 50 P 48 04 2005 31 53 Frequency response Equalization Polar diagram ...
Page 34: ...MKH 50 P 48 34 53 04 2005 MKH 50 circuit diagram ...
Page 37: ...MKH 60 1 P 48 04 2005 37 53 Frequency response Equalization Polar diagram ...
Page 41: ...MKH 60 1 P 48 04 2005 41 53 MKH 60 circuit diagram ...
Page 44: ...MKH 60 1 P 48 44 53 04 2005 ...
Page 47: ...MKH 70 1 P 48 04 2005 47 53 Frequency response Equalization Polar diagram ...