Specifications

X, P, and K 11644A 3-7
User Information
Changing the ¼ Wavelength Shim Calibration Definition
Changing the ¼ Wavelength Shim Calibration Definition
The calibration kit definition data provided with this kit has a nominal value for the ¼
wavelength shim offset delay. You may use the nominal value provided, or measure the
exact thickness of the shim and use that value to calculate its exact offset delay. Use the
following procedure to change the nominal value of the ¼ wavelength shim delay to reflect
the specific device in your kit.
1. Load the calibration kit data into Cal Kit 1.
2. Using the formula below, calculate the offset delay:
NOTE The value of the propagation velocity in air is corrected for a temperature of
23 °C, 50% relative humidity, and 760 mm Hg of pressure.
length of
1
4
---
wavelengh section (mm)
299.6953
mm
ns
---------
(propagation velocity in air)
----------------------------------------------------------------------------------------------------- o f f s e t d e l a y ( n s )=