Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 175)

OPERATING MANUAL 2945A

46882-311D 5-13

(10) Switch distortion measurement off.

(11) Refer to Results table 5-18 on page 5-36. Set the UUT Mod Gen 2 to provide 10 kHz

deviation level at a frequency of 50 Hz.

(12) Select the 30 Hz to 50 kHz filter on the Modulation meter.

(13) Check that the Modulation meter reads 10 kHz deviation

10%

10 Hz. Repeat for UUT

modulation frequencies of 10 kHz and 15 kHz.

AF output tests

Audio generator output level

Specification

Level range: 0.1 mV to 4 V RMS

Accuracy: ±5% ±1 resolution 50 Hz to 15 kHz

Test equipment

Description Minimum specification Example

DVM 1 % accuracy 50 Hz to 15 kHz Solatron 7150+

C2588

DVM

VOLTMETER

INPUT

TERMINALS

AF GEN

OUTPUT

UUT

Fig. 5-10 Audio generator level accuracy checks

(1) Refer to Results table 5-19 on page 5-37. Connect the test equipment as shown in Fig. 5-10,

connecting the UUT AF Gen output socket to the DVM voltmeter input terminals.

(2) Set the DVM to measure Volts AC RMS.

(3) Set the UUT to [AF TEST], [Audio Gen] 1 [FREQ] 1 kHz, [LEVEL] 4 V (ensure that AF

Gen 2 is OFF). Check that the DVM reads the level set

1 mV. Repeat with

frequencies of 50 Hz, 150 Hz, 500 Hz, 2 kHz, 5 kHz, 10 kHz and 15 kHz in turn, checking

that the DVM reads the level set

1 mV.

(4) Set the UUT to [AF Gen 1], [FREQ] 1 kHz, [LEVEL] 20.0 mV. Repeat with the level set to

400 mV. Check that for each level the DVM reads the level set ±5% ±0.1 mV. Repeat with

the level set, in turn, to 1000 mV, 2000 mV and 3000 mV, and check that in each case the

DVM reads the level set ±5% ±1 mV.

(5) Refer to Results table 5-20 on page 5-37. Repeat the above checks for AF Gen 2 with AF

Gen 1 switched OFF.

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 236 237

Pas de commentaire

Aeroflex 2946A Instructions d'exploitation Page 175