Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 173)

OPERATING MANUAL 2945A

46882-311D 5-11

UUT

C2587

RF INPUT

BNC

OUTPUT

Modulation meter

Fig. 5-8 Internal AM accuracy checks

(1) Refer to Results table 5-10 on page 5-34. Connect the test equipment as shown in Fig. 5-8

(BNC output socket on UUT).

(2) Set the UUT to [Rx TEST], RF IN/OUT [SELECT] BNC output, [RF Gen],

[LEVEL] 0 dBm, [FREQ] 1.5 MHz, [Mod Gen], [Gen 2], [FREQ] 1 kHz, [LEVEL] 50%.

(3) Set the Modulation meter to monitor AM in a 0.3 to 3.4 kHz bandwidth.

(4) Check the Modulation meter for a reading within

7% of setting

1 digit.

(5) Repeat step 4, but with the UUT RF generator set to each of the remaining carrier frequencies

shown in the Results table 5-10 on page 5-34.

(6) Refer to Results table 5-11 on page 5-34. Set the UUT to [RF Gen], [FREQ] 100 MHz,

[LEVEL] 5 dBm, [

∆

INC] 1 dB, [Mod Gen], [Gen 2], [LEVEL] 70% and check the

Modulation meter for a reading within

7% of setting

1 digit. Using the level decrement

arrow key, decrement the RF level by 1 dB and repeat check. Repeat in 1 dB decrements

down to

−

15 dBm.

(7) Refer to Results table 5-12 on page 5-35. Set the UUT to [RF Gen], [LEVEL] 0 dBm,

[Mod Gen], [Gen 2], [LEVEL] 5%.

(8) Check that the Modulation meter reads within

7% of setting

1 digit. Repeat for UUT AM

depths of 10, 20, 30, 40, 50, 60, 70, and 85%.

(9) Refer to Results table 5-13 on page 5-35. On the UUT, press [FREQ] 65 Hz to set Mod Gen

2 to 65 Hz.

(10) Set the Modulation meter to monitor AM in a 30 Hz to 50 kHz flat bandwidth.

(11) Check the Modulation meter for a reading within

10% of setting

1 digit.

(12) Repeat step 11 with the UUT set to each of the following mod rates:- 140 Hz, 500 Hz, 2 kHz,

and 5 kHz.

(13) Set the UUT mod rate to 15 kHz and check the Modulation meter for a reading within

15%

of setting

1 digit.

(14) Refer to Results table 5-14 on page 5-35. Reset Mod Gen 2 frequency to 1 kHz and level to

30%.

(15) Set the Modulation meter to monitor AM in a 0.3 to 3.4 kHz bandwidth.

(16) Connect the LF output from the Modulation meter to the AF input on the UUT. Select the

0.3 to 3.4 kHz AF Filter on the UUT and select distortion measurement.

(17) Check that the distortion indicated on the UUT display is less than 2 %.

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Aeroflex 2946A Instructions d'exploitation Page 173

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