User Manual

ManualsBrandsSchoeps ManualsAudio for VideoCMIT 5U Shotgun Microphone Softie Kit

DC generator

regulator

micro controller, LEDs

preamp

impedance

converter

filter 1

push-

buttons

filter 2 filter 3

output

stage

RFI

filter

[1] +Phase: an excursion of the diaphragm towards the back electrode

(positive pressure phase) leads to a positive signal at this pin

[2] Matched (i.e. matching tolerance of only 0.7%), see page 19

[3] Here are three simple methods for verifying correct phantom powering.

These measurements should be made at an unused input. Reduce the

channel gain to the minimum to protect the loudspeakers, etc. If micro-

phones are connected to other inputs at the same time, no substantial

difference should occur in the results.

1. Measure the open-circuit voltage between ground (pin 1) and either

pin 2 or pin 3 of the XLR input. Given the permitted tolerances, this

voltage should be between 44 and 52 VDC for P48. Then, measure the

short-circuit current between ground (pin 1) and either pin 2 or pin 3 of

the XLR input. Given the permitted tolerances, this current should be

between 5.9 and 8.5 mA DC for P48.

Note: Well-designed phantom power supplies must tolerate at least a

temporary short circuit without damage; an unbalanced connection

(which is occasionally necessary) would cause the same current to be

drawn. To be safe, however, do not leave the short circuit closed for any

longer than necessary.

2) Measure the DC voltages on the modulation leads with a micro-

phone connected, e.g. by opening the connector shell of the cable. The

two voltages (from pin 2 and pin 3 to pin 1) must be identical. They

should be about 33 Volts (minimum = 29 Volts).

3) For P48, use a SCHOEPS PHS 48 tester. Plug it in; if the LED glows and

stays lit, all is well.

Phantom-

powering

[3]

= +48 V

[2]= 6.8 kΩ

Preampli -

fier,

recorder

or mixing

desk

∼

screen

-phase

+phase

XLR-3

connector

XLR-3

connector

Pin 1: screen (GND)

Pin 2: +phase[1]

Pin 3: –phase

Bottom view

(as the pins are seen)

Microphone -

cable

[3]

SCHOEPS GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050

www.schoeps.de · mailbox@schoeps.de

Block Diagram of the CMIT 5 U

English