Agilent Technologies E7495A RF Manual de Serviço descarregar pdf (Página 405)

Chapter 15 405

Signal Generator

Using the Signal Generator

Signal Generator

5 Select the channel standard

from the list using the up and

down arrow buttons.

6 [Select]

7 On [Units] select

Chan. Each time you press this menu key, the

analyzer switches between Channel (Chan)

and Frequency (Freq). The Units settings are

coupled across multiple tools.

8 [Fr/Time Ref] Complex signals such as cdma and 1xEV-DO

require accurate time and frequency

references before they can be reliably

generated or demodulated.

9 [GPS] or [External Even Sec] Only

GPS and External Even Second

provide the timing information necessary to

generate an accurately modulated signal.

Select GPS if you are receiving GPS location

information (

System, [Fr/Time Ref

Location], [Show GPS Location] set to

On).

Otherwise, select External Even Second, and

connect your external even second reference

signal to the

Even Second Sync In port on

your test set. It is worth noting that the signal

may disappear momentarily when you switch

between different time references because

the signal needs to be realigned with the

system time.

If you are not needing a time aligned signal

(for example, you are simply generating a

carrier wave), you do not need to use either

GPS or External Even Second Clock as your

time reference.

If you are using a frequency only reference,

the signal will be modulated with the same

accuracy as when using a time reference. The

difference is that it will not be time aligned to

the system time during playback

Step Notes

1 2 ... 400 401 402 403 404 405 406 407 408 409 410 ... 685 686

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