Agilent Technologies N8201A Service Manual download pdf (Page 170)

170 Agilent N8211A/N8212A Performance Upconverter Synthetic Instrument Module, 250 kHz to 20 / 40 GHz

7 System Commands

Calibration Subsystem (:CALibration)

:DCFM

Supported All with Option UNT

:CALibration:DCFM

Initiates a DCFM or DCΦM calibration depending on the currently active modulation. This

calibration eliminates any dc or modulation offset of the carrier signal.

Use this calibration for externally applied signals. While the calibration can also be

performed for internally generated signals, dc offset is not a normal characteristic for them.

If the calibration is performed with a dc signal applied, any deviation provided by the dc

signal will be removed and the new zero reference point will be at the applied dc level. The

calibration will have to be performed again when the dc signal is removed in order to reset

the carrier signal to the correct zero reference.

:IQ

Supported N8212A

:CALibration:IQ

Initiates an I/Q calibration for a range of frequencies. For setting range frequencies, refer

to“:IQ:STARt" on page 171, and “:IQ:STOP" on page 172.

:IQ:DC

Supported N8212A

:CALibration:IQ:DC

Starts and performs a one– to two–second adjustment that is not traceable to a standard.

However, it will minimize errors associated with N8212A internal voltage offsets. This

adjustment minimizes errors for the current N8212A setting and at a single frequency. The

DC adjustment is volatile and must be repeated with each N8212A setting change. This

command can be sent while the RF On/Off is set to Off and the adjustment will still be valid

when the RF is enabled.

The I/Q DC adjustment is dependent upon a number of instrument settings. If any of the

instrument settings change, the adjustment will become invalid. The dependent instrument

settings are:

• RF frequency

• I/Q attenuation level

• I/Q polarity settings

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Agilent Technologies N8201A Service Manual Page 170