Phase Or Group Delay Measurements - Agilent Technologies 8719D User Manual

Phase or Group Delay Measurements

For information on group delay principles, refer to "Group Delay Principles" in Chapter 6.
The accuracy of this measurement depends on the quality of the mixer that is being used for
calibration and how well this mixer has been characterized. The following measurement must
be performed with a broadband calibration mixer that has a known group delay. The following
table lists the specifications of two example mixers for use in calibration:
1. Set the LO source to the desired CW frequency and power level. For this example, the LO
source is set to the following values:
CW frequency = 1000 MHz
power = 13 dDm
2. Initialize the analyzer by pressing Preset].
3. Connect the instruments as shown in Figure 3-17, placing a broadband "calibration" mixer
To prevent connector damage, use an adapter (HP part number 1250-1462) as a
Caution
connector saver for R CHANNEL IN.
3 . 2 4 M e a s u r e m e n t s
Minicircuits
dc to 1250 MHz
( O p t i o n 0 8 9