Printed Circuit Board Reverse Engineering Rambus Standard Example

Printed Circuit Board Reverse Engineering Rambus for Calibration against a standard is completed to determine offset between instrument measured and actual. Complete this by following the average mean method described in the measurement section of this document.

Determine the difference between the known standard value and the reading and use that value as a fixed offset to obtain actual impedance.

Note: Calibration against standard should be completed daily.

Example:

Calibrated standard          25 Ohms(+/- 0.1)

Measured value                  27 Ohms

Offset value(25 – 27)        -2.0 Ohms

4.3.2 Airline- 28 Ohm(Preferred)

Calibration against a 28 Ohm airline provides the most accurate calibration. This will require a custom made airline. Primary disadvantage is airline availability and cost after PCB Plate Reverse Engineering.

Disconnect probe from cable, connect airline and measure.

Airline specifications:

28 Ohms +/- 0.1 Ohms DC to > 2 GHz

7 mm or 3.5 mm

15 cm min length

30 cm max length

Nist Certified

4.3.3 Airline- 25 Ohm

Calibration to 25 Ohms can be completed by utilizing two commonly available 50 Ohm airlines connected in parallel as illustrated by cloning PCB card. Both airlines must be identical to each in length and type. Disadvantage of the 25 ohm calibration is accuracy while the advantage will be cost and availability.

Disconnect probe from cable, connect airlines and measure.

Airline specifications           :