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ACCEPTANCE TESTING

5-14

Audio generator distortion

Specification

Distortion:

Less than 0.5% at 1 kHz

Less than 1% from 50 Hz to 15 kHz

Test equipment

Description Minimum specification Example

Distortion analyzer Capable of measuring distortion from 1 kHz to 15 kHz

down to 0.1%.

IFR 2965

or HP8903B

C2589

AF GEN

OUTPUT

INPUT

UUT

Distortion analyzer

Fig. 5-10 Audio generator signal purity checks

(1) Refer to Results table 5-14 on page 5-36. Connect the UUT AF GEN output to the AF input

of t

he distortion meter, as shown in Fig. 5-10.

(2) Set the UUT to [AF TEST], [Audio Gen], [FREQ] 1 kHz, [LEVEL] 4 V. Audio Gen 1

should be set to sinewave and Audio Gen 2 should be OFF.

(3) Set the Distortion meter to measure distortion at 1 kHz in a 0.3 to 3.4 kHz bandwidth.

(4) Check that the distortion indicated is less than 0.5%.

(5) Repeat step (4) with AF Gen 1 level set to 100 mV.

(6) Set the Distortion meter to measure distortion in a 20 kHz Lowpass bandwidth.

(7) Set AF Gen 1 to provide 4 V at a frequency of 2 kHz. Check that the distortion indicated on

the Distortion meter is less than 1%. (If a 2965 is being used, see the Operating Manual for

instructions on setting distortion measurement to different frequencies.) Repeat at 5 kHz.

Set the lowpass bandwidth on the distortion meter to NONE and repeat with AF Gen 1 set to

provide 15 kHz.

(8) Refer to Results table 5-15 on page 5-36. R

epeat the above procedure, except this time with

AF Gen 1 swi

tched OFF and AF Gen 2 ON.

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Aeroflex 2948B Betriebsanleitung Seite 200