Calibrating a model 400 B&W Reflection Densitometer

If you are new to this process it will help to use the AC adapter while following this series of instructions. The microprocessor will "sleep" if too much time passes between keystrokes.


  1. Locate the calibration reference card (PN 400-62) and envelope.
  2. There are numbers listed for the white target and for the black. While calibrating we will ensure that these numbers are properly stored in the densitometer's memory
  3. Unlock the shoe and adjust the viewing contrast. Notice the word "CAL" is written between the first two keys. To begin the calibration routine, press both of these keys at the same time.
  4. The densitometer will briefly display its software version code. It will then display the prompt "N CALx Y" (where x is the optics type installed in your instrument.)
  5. Press the key beneath the letter "Y". The densitometer will prompt "N QCAL Y". "QCAL" is a shortened calibration routine. We will do the long version to ensure that the densitometer is operating correctly.
  6. Press the key beneath the letter "N". The densitometer will continue by prompting "SET LO". It will then display the value currently stored for the paper (white) target's channel.
  7. Compare the displayed value to that printed on the calibration reference's envelope. If the number matches, press the center key to proceed. If the numbers do not match then you must edit the stored numbers (see Related Support).
  8. After the "LO" has been verified, the densitometer will advance by prompting "SET HI".
  9. Verify and, if necessary, edit the "HI" value. Advance by pressing the center key. The densitometer will then prompt "READ WHT"
  10. Place the calibration reference card on a firm, flat surface. Locate the densitometer on the card. The crosshairs of the instrument shoe should cover the crosshairs printed on the card.
  11. Press the densitometer down firmly and wait until a number is displayed. When the instrument is raised, it will prompt "READ BLK".
  12. Locate the instrument over the black target. Again press down firmly and wait until a number is displayed.
  13. After the last target has been measured, the densitometer will return to normal operation.

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