Agilent Technologies E4406A manual Setting Up Baseband I/Q Inputs, Table

Making Measurements

Using Baseband I/Q Inputs (Option B7C)

Setting Up Baseband I/Q Inputs

Option B7C adds two keys that let you adjust the I/Q inputs; the I/Q Setup key and the I/Q Range key. Both keys are located under the Input/Output front panel key in the Input menu.

The I/Q Range key lets you select one of four levels as an upper limit for the signal being applied to the Baseband I/Q inputs. The level may be selected in units of dBm, dBmv, dBuv, Volts, and Watts. The following table shows the four-level selections available for each unit of measure: The default is 1 Volt.

The I/Q Range power levels in Table 4-8are based on an I/Q Input Z of 50 Ω. I/Q Range voltage levels are independent of I/Q Input Z.

Table 4-8	I/Q Range Settings by Displayed Unit of Measure
	Unit of	Highest			Lowest
	Measure	Setting			Setting
	dBm	13.0 dBm	7.0 dBm	1.0 dBm	−5.1 dBm
	dBmv	60 dBmv	54 dBmv	48 dBmv	41.9 dBmv
	dBuv	120.0 dBuv	114.0 dBuv	108 dBuv	101.9 dBuv
	Volts	1 Volt	500 mV	250 mV	125 mV
	Watts	20.0 mW	5.0 mW	1.2 mW	310.0 uW

If I/Q Range is set below the default and the error message “Input Overload” is displayed, this value may be adjusted to its maximum. Beyond that point, the signal must be attenuated to preserve the measurement accuracy. Using a lower value than the default can provide an increased dynamic measurement range.

I/Q Setup lets you adjust the following:

•I Offset - Use I Offset to input a value in Volts to offset the measured I value. The default value is 0.0000 Volts, the min/max values are ± 2.5600 Volts. The tuning increment depends on the I/Q Range setting as shown in Table 4-9. This value only affects the displayed results, and does not appear as a correcting voltage at the probe.

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