Agilent Technologies 93000 SOC Series Training Manual page 95

5-3 Performing the Auto Calibration
Saving the Calibration Data
Agilent 93000 SOC Series User Training Part 1, October 2004
Compensation for any difference between the two values is automati-
cally made, thus ensuring that your system calibration remains valid.
The drive to receive alignment for the SOC Series should be a stable
value which does not vary over time. The results of a drive to receive
alignment measurement should not differ from the results of the auto
calibration. You might, however, wish to execute a drive to receive
alignment measurement to ensure that your system is in a stable state.
TDR Measurement
Upon completion of the drive to receive measurement the system now
performs a TDR measurement. This measurement is required to find
out the signal path delays with respect to the pogo pins.
The AC skew calibration yields signal path delays with respect to a
certain point in the ICU. Since the path delay inside the ICU is
unknown the signal path delays with respect to the pogo pins cannot be
calculated. It must be measured.
The results of the TDR measurements allow you to derive the AC skew
calibration values with respect to the pogo pins
.
Figure 49 TDR Measurement
DPS Calibration
The next calibration routine performs calibration on all DPS resources
within the system.
Upon completion of the DPS calibration, a dialog window prompts you
to save the calibration data.
Signal path delay measured
from AC skew calibration
Signal path delay from TDR
measurement
Calibration
ICU
Pogo pin
Reference point for AC
skew calibration (same
point for all pins)
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