ATI Technologies M1000 Panduan Pengoperasian dan Pemeliharaan - Halaman 4

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Microphone inputs and outputs use XLR type connectors and require mating

plugs. The applicable input plugs are Switchcraft A3M or equivalent. The output

plugs are Switchcraft A3F or equivalent. Mike wiring is conventional, hi (in phase)

to pin 2, Lo (out of phase) to Pin 3, Shield to pin 1. Either 150 ohm or 50-ohm

microphones can be connected to the MicroAmp without modification.

The MicroAmp M1000 will accept microphone outputs up to 125 mVrms (-14dBm

available power/150 ohms) without distortion.

Output wiring is indicated on the rear panel label. HI outputs are in phase with

each other and with the input signal.

Transformer Output (M1000-1, L1000-1) may have either HI or LO outputs

grounded (but not both).

CAUTION: Balanced differential output (M1000-2, L1000-2) has active drivers for

both HI and LO outputs terminals. DO NOT GROUND either HI or LO terminals.

To drive an unbalanced (one side grounded) Load, connect it between HI and

GND terminals and let the LO terminal float. Two separate 600 ohm unbalanced

loads can be driven from each output without interaction by connecting one

between HI and GND and the other from LO to GND. The two loads thus driven

will be out of phase with each other. Individual grounds are provided for CH l/left

and CH 2/right outputs.

ADJUSTMENTS

The MicroAmp has sufficient gain and output capability to overdrive some

console inputs particularly those providing preamps for high-level input channels.

A -50dBm available power microphone output (2.5 mVrms) will provide +8dBm

output with the gain pot set to two o'clock position. 12 o'clock is approximately

OdBm and 10 o'clock is -10dBm output. Operation with the MicroAmp pot set

below 10 o'clock position degrades noise performance and a fixed attenuator pad

should be placed between the MicroAmp output and the Console input to allow

MicroAmp operation at around 2 o'clock.

MAINTENANCE NOTES

Power supply voltages are + and - 18 VDC nominal, dropping to +/16 VDC under

full output. Maximum allowable voltages are +/- 22 VDC (limited by IC). If zeners

are replaced, remove Al, A2, and A3 ICs and check output voltage before

plugging ICs back into the circuit. Remove power when inserting or removing

ICs.

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