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A Series Active Monitor Speakers

E4/32 Service Date printed: 29.02.00

4.5.2 A5: Checks on the Assembled Unit

4.5.2.1 A5: Required Test Tools

C Anechoic room;

A1 True-RMS AC ammeter;

GHT High-voltage generator 1.8 kV, 50 Hz, max. 10 mA;

G1 Sweep sine-wave generator with balanced output (AudioPrecision System

One or equivalent);

M1 Measurement microphone Brüel & Kjær BK4133 + preamp BK2639 or

equivalent;

M2 Measurement amplifier Brüel & Kjær BK2610 or equivalent

M3 Level/THD/phase analyzer (AudioPrecision System One or equivalent);

P1 Phase meter with adjustable propagation delay compensation on reference

input.

4.5.2.2 A5: Initial Settings

• Set the level potentiometer to CAL position (fully counterclockwise);

• Set the roll-off potentiometer to CAL position (fully counterclockwise);

• Set power switch to ON.

4.5.2.3 A5: Insulation Check

• Connect the HV generator to the mains input connector according to the

diagram below:

• Apply 1.8 kV for 5 seconds;

• The leakage current must not exceed 5 mA.

1.8 kV

GHT

Studer A1 User Manual

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