Agilent Technologies N8201A Service Manual download pdf (Page 484)

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484 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz

24 System

Alignments

Displays functions that control the automatic alignment of the instrument and load default

values for the alignment system.

Key Path: System

Remote Command:

There is no remote command for this key.

Auto Align

Allows you to turn the instrument automatic alignment On or Off or select Alert to be

alerted that alignments are needed.

Off - This setting has been changed to work the same as the Alert selection. It is very

important to know that you have turned off the alignments since, over time, leaving them

permanently off will result in measurement inaccuracies.

On - The instrument behaves like the Alert, but will automatically perform a full alignment

when it is needed. In addition, every 15 minutes passing or 1.5 degrees temperature change

will cause just the RF system gain to be aligned, to achieve the best absolute amplitude

accuracy. For either alignment, the instrument will stop any measurement currently in

process, perform the full alignment, then restart the measurement from the beginning

(similar to pressing Restart). If any alignment FAILs or is ABORTed by the user (for example,

ESCape key), the instrument will wait 5 minutes before retrying the necessary alignment.

This helps to avoid infinite recursive loops of alignment behavior in the event of broken

hardware. When Auto Align, On is selected, “AA” appears along the left edge of the display.

Also see “Align All Now" on page 485.

Alert - A 3 degree (Celsius) temperature change or a time span of 24 hours since the last

successful Full alignment (for example, Align All Now) will trigger an alert that alignments

need to be done, but no alignments will be performed without user input. When Auto Align,

Alert is selected, “AL” appears along the left edge of the display.

NOTE

Most CALibration commands execute in the background, permitting other SCPI commands

to be processed concurrently. If a measurement command is sent right after a CALibration

command, there can be interaction between background alignments and the measurement.

The *WAI command should be issued after any CALibration command and before the

measurement command. Note that sending the query form of a CAL? command will

automatically hold off any following commands until the query value is returned.

Bit 0 (CALibration) must be set to 1 in the STATus:OPERation:ENABle register to ensure

that the *WAI command waits for calibration to complete. This is the factory preset and

*RST setting.

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Agilent Technologies N8201A Service Manual Page 484

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