Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 187)

OPERATING MANUAL 2945A

46882-311D 5-25

(1) Refer to Results table 5-41 on page 5-43. Connect the equipment as shown in Fig. 5-17,

connecting the incoming signal to the antenna input socket of the UUT. Lock the Service

Monitor external standard input to the external standard output of the signal generator.

(2) Set the UUT to [Tx TEST], RF IN/OUT [SELECT] antenna BNC input socket. Press

[HELP/SETUP], [Setup], and toggle RF counter resolution until 1 Hz is displayed in reverse

field, then press [Return], [Return] to get back to the TX test display.

(3) On the UUT, press [Tx Freq] 10 MHz. Set the RF signal generator to provide a signal of

10 MHz at an RF level of

−

60 dBm. Check this level by removing the RF test signal

connection from the UUT and applying it to the RF power meter. Adjust the level if

necessary, then reconnect the UUT.

(4) Check that the offset indicated on the UUT is 0 Hz

1 Hz.

(5) Repeat steps 3 & 4 for frequencies of 500 MHz and 1.05 GHz.

(6) Refer to Results table 5-42 on page 5-44. Press the [Auto Tune] key on the UUT.

(7) Set the RF signal generator to provide a signal of 1000 MHz at a level of

−

13 dBm (check

and set this level on the power meter). Check that the UUT autotunes to the incoming

frequency and the Frequency counter indicates the frequency

1 Hz. Repeat at 500 MHz and

10 MHz.

(8) Disconnect the external reference from the UUT and connect an external reference with an

accuracy of 1 part in 10

or better to the RF signal generator.

(9) Refer to Results table 5-43 on page 5-44. Set the RF signal generator to provide a frequency

of 1000 MHz at a level of 0 dBm.

(10) Check that the UUT indicates a frequency between 999.999500 MHz and 1000.000500 MHz.

If the instrument is fitted with option 3, the high stability (OCXO) internal frequency

standard, check that the reading falls between the limits 999.999750 and 1000.000250. The

test limits in this step are for guidance and assume that the internal frequency standard has

been recently adjusted. Ageing and stability have to be considered when establishing the real

test limits.

RF spectrum analyzer

Specification

Frequency range: 100 kHz to 1.0 GHz.

Resolution bandwidth 300 Hz, 3, 30, 300 kHz, 3 MHz.

On screen dynamic range: 80 dB.

On screen linearity: Typically ± 2 dB ± resolution (10 dB/div) (10 dB above the noise floor)

Resolution: 0.1 dB on 2 dB/ division

0.5 dB on 10 dB/ division

Level flatness ±1 dB ± resolution over 50 MHz span.

Test equipment

Description Minimum specification Example

RF signal

generator

100 kHz to 1 GHz. Level accuracy ±0.85 dB IFR 2041

RF power meter ±0.1 dB from 10 MHz to 1 GHz IFR 6960/A/B +

6912 sensor

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 236 237

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Aeroflex 2946A Instructions d'exploitation Page 187

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