HP 8753E manual Phase or Group Delay Measurements

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 mixers that may be used for calibration:

Mod e l	USefIll	Group
Nnmber	Freqaency Bange	DeLay
ANZAC	.03 to 3 Gllz	.5 ns
MCD-123
Mini~ircui~	dc to 1250 MHz	.6 ns
ZFM-4

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 dRm

2.Initialize the analyzer by pressing Q%+.

3.From the front panel of the HP 8753E, set the desired receiver frequency and source output power by pressing:

4.Connect the instruments as shown in Figure 3-17, placing a broadband “calibration” mixer (ZFM-4) between PORT 1 and PORT 2.

Caution To prevent connector damage, use an adapter (HP part number 1250-1462) as a connector saver for R CHANNEL IN.

3-24 Making Mixer Measurements