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ATI Technologies M100 Manual de funcionamiento y mantenimiento

COMMON MODE REJECTION

Replacement of R6, R7, R8, R9, R62, C11, or C12 will require readjustment of R27 to

maintain maximum common mode rejection (CMR). To set R27, apply 10 Vrms at 60

Hz between ground pin 1, pin 2, and pin 3 (tied together) of XLR input J1. Measure

output (at J2 pins 2 to 3) and adjust R27 for null. A 90 dB CMR is attainable but may be

difficult to measure without a tuned voltmeter.

DISTORTION

Replacement of R36, R37 R38, R39, and R40 or output transformer T2 will require

readjustment of R40. Apply sufficient 20 Hz signal to the input with the gain switch at

–20 dB and the gain control set to 12 o'clock to drive the loaded output to +20 dBm.

Measure Total Harmonic Distortion (THD) at the output and adjust R40 for the best null.

If you cannot detect a good null, your audio generator may well have more internal

distortion at 20 Hz than even the untrimmed contribution of the M100, which is typically

less than .25%. When properly set, using superior test equipment such as Amber or

Audio Precision, distortion measurements should be limited only by residual white noise

to levels of .03% across the audible band.

GENERAL

Power supply voltages are + and – 16 VDC nominal. IC output DC voltages under no

signal, shorted input conditions should read 0 VDC at A1 and A2, pins 1 and 7, A3-7,

A4-1 and 7 and A5, pin 1 and 6. A3 pin 1 should read within the range of + to –10 VDC

and a 28 Vp-p square wave should be visible with an oscilloscope at A5, pins 8 and 14.

Deviations of more than .1 VDC from the 0 VDC nominal is an indication of IC or circuit

problems. Ten years from now, we recommend replacing all aluminum electrolytic

capacitors. Keep 250 Watt soldering guns out of the M100.

MODIFICATIONS

230 VAC OPERATION

The M100 is wired for 115 VAC, 50/60 Hz operation unless otherwise requested at the

time of ordering. It can be modified for 230 VAC use by removing W1 and W3 and

inserting a jumper wire in W2.

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