Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 434)

Table 8-5. Status Messages (9 of 11)

SYSTEM OPERATING IN PULSE MODE. ESTABLISH QUADRATURE VIA AUX.

MONITOR PORT... The PULSED Carrier Type was selected and the system cannot verify

quadrature or establish quadrature automatically.

Action:

Use an oscilloscope connected to the HP 11848A Aux Monitor Port to achieve

quadrature (dc). Refer to Carrier Type in Chapter 5, Special Functions for Information on

establishing quadrature with a Pulsed Measurement.

Taking (RF_Model) sweep... This message indicates that the System is performing a

measurement

measurement.

Taking HP 3561A sweep... This message indicates that the System is performing a

measurement.

TEST PATH: REFERENCE PATH... Indicates which HP 11848A internal path is being used

for a reference measurement in a transfer function measurement.

The FM Deviation on the () will be changed from (X) to (Y). If this is unacceptable,

press 'Abort'... During auto zerobeat of sources, the reference source frequency changed

invalidating the FM Deviation setting specified for it.

Action:

Press

Proceed or Abort

The LNA is currently (in/out) This may be changed via the Toggle LNA' key... When

PULSED is selected for the 'Carrier Type' in the Special Function Menu, a 'Toggle LNA' key

will appear in some screens to allow the user to select between having the LNA in or out. If

the system has decided to switch OUT the LNA and you are concerned about measurement

sensitivity, you may wish to further evaluate the decision. Connect an oscilloscope to the

AUX Monitor Port on the HP 11848A. Observe the LNA output and toggle the LNA IN. If the

peak output level exceeds —0.5V or +1V, the noise may be clipped or compressed so the

measurements must be made with the LNA OUT. If the noise is not significantly clipped, the

measurement may be made with the LNA IN.

The LNA of the HP11848A has been bypassed. This will result in a degradation of the

system noise floor... This is a status message indicating a high input level into HP 11848A. If

you wish to further evaluate the LNA decision, abort the measurement and access the Special

Functions display. Select the PULSED Carrier Type and then initiate a Repeat Measurement.

When the LNA decision is displayed again, connect an oscilloscope to the AUX Monitor port or

the HP 11848A. Observe the LNA output and toggle the LNA IN. If the peak output level exceeds

—0.5V or +1V, the noise may be clipped or compressed so the measurements must be made

with the LNA OUT. If the noise is not significantly clipped, the measurement may be made with

the LNA IN.

The plotted data was derived from Two-oscillator or Three-oscillator comparison... This

message is shown as the parameter summary for a result that was computed, not measured.

Status Messages 8-37

1 2 ... 429 430 431 432 433 434 435 436 437 438 439 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 434