Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 168)

ACCEPTANCE TESTING

5-6 46882-311D

(3) Check that the power meter indicates

−

21 dBm

2 dB.

(4) Select N-type output/N-type input mode and check that the level measured is

−

21 dBm

2 dB.

(5) Press RF IN/OUT [SELECT] until the mode returns to N-type output/antenna input.

(6) Repeat steps 3 to 5 for 100 MHz and then in 100 MHz steps up to and including 1000 MHz.

ALC linearity

(1) Refer to Results table 5-3 on page 5-31. Connect the sensor to the N-type output socket, as

shown in Fig. 5-2.

(2) Set the UUT to [RF Gen], [LEVEL]

−

21 dBm, [

∆

INC] 1 dB, [FREQ] 10 MHz.

(3) Increment the RF output of the UUT in 1 dB steps down to

−

38 dBm, ensuring that the

indication on the power meter is within

2 dB of each level set.

(4) Return the UUT RF level to

−

21 dBm.

(5) Set the UUT carrier frequency to 500 MHz and repeat step 3. Refer to Results table 5-4 on

page 5-32.

(6) Set the UUT carrier frequency to 1 GHz, return the level to

−

21 dBm and repeat step 3. Refer

to Results table 5-5 on page 5-32.

BNC output mode

No claim is made on the output level accuracy of the BNC socket. The following is a functional

check to ensure correct internal operation.

(1) Connect the 6920 sensor to the BNC output, as shown in Fig. 5-2.

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

[LEVEL]

−

21 dBm, [FREQ] 10 MHz. All modulation and noise measurements should be

switched OFF.

(3) Check that the power meter indicates

−

21 dBm

4 dB.

(4) Repeat step 3 for 100 MHz and then in 100 MHz steps up to and including 1000 MHz.

Attenuator accuracy

The following test will confirm that the attenuator performs to the published performance

specification. In the event of the receiver not being available, an alternative method to functionally

test the attenuator is also suggested.

Measuring

receiver

C2582

UUT

N TYPE

OUTPUT

Fig. 5-3 RF level set up

(1) Connect the test equipment as shown in Fig. 5-3.

(2) Set the UUT to [RF Gen], [ LEVEL],

−2

1 dBm, [ FREQ] 2.5 MHz.

(3) Tune the receiver to the frequency set on the UUT RF Generator and measure the RF level.

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Aeroflex 2946A Instructions d'exploitation Page 168

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