11. Check the display. If incorrect, press the CLEAR key and re-enter the
number. When finished, lift the probe at least 3 inches (76 mm) away
from the part and press the ENTER key.
12. The 233 is now calibrated and ready for measurement.
Base Calibration
1. Press the CAL key.
2. Place the probe on the bare part of the different base material.
3. Press the ZERO/UNITS key.
4. Lift the probe off the bare sample and wait for the beep.
Surface Roughness Calibration
This calibration consists of taking readings on several points over the surface of
the bare part and again with shims, instead of taking a reading at just one spot.
The averages of the bare readings and the readings taken with the shims are
stored as the calibration. If a surface roughness calibration is necessary, more
than likely the individual readings taken on coated parts will vary. To lessen the
variation in the readings it is suggested that an average reading be taken. The
averages should be fairly consistent.
1. Select the memory location for the calibration as described in Memory
Management: How to Select a Memory Location.
2. Press the CAL key. The word CAL will appear in the right side of the
display and “C” will appear in the upper left.
3. Place the probe on the bare part.
4. Wait for the reading to stabilize, then press the ENTER key.
5. Repeat steps 3 and 4 (up to 9 times), moving the probe around the entire
part. A “Cn” will be displayed on the upper left, with n representing the
number of readings taken so far in the calibration.
6. Press the ZERO/UNITS key.
7. Press the “٭” key, then press the CAL key. The word CAL will appear on
the right and “C1” will appear in the upper left.
8. Place the 1 mil (25.4 um) shim on the bare part. Place the probe over the
shim. Wait for the reading to stabilize, then press the ENTER key.
9. Repeat step 8 (up to 9 times), moving the probe and shim around the
entire part so as to take readings over the area of interest.
10. After the last measurement has been taken, enter the thickness of the
shim using the numerical keys. Once a numerical key has been pressed,
the probe can be lifted from the shim without affecting the calibration.
11. Check the display. If incorrect, press the CLEAR key and then re-enter
the number. When finished, lift the probe at least 3 inches (76 mm) away
from the part and press the ENTER key.
12. The display will now show “C2” in the upper left corner.
13. Place the 10 mil (254) shim on the bare part. Place the probe over the
shim. Wait for the reading to stabilize, then press the ENTER key.
14. Repeat step 13 up to a maximum of 9 times. Move the probe and shim
around the entire part to take readings over a large area.
Oxford Instruments Contact Measurement Page 9 of 24
233 USER GUIDE
The information in this document is private and confidential and must not be copied.
Oxford Instruments plc
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