The 880 series densitometers (880, 881, 882) require periodic calibration to ensure accurate measurements. Begin by locating the Auto-Cal strip (PN 880-100). It is located in a protective envelope. This is a calibrated and certified media. It should be cared for and replaced every 18 months. An expiration date is printed on both the card and its protective envelope. To calibrate proceed as follows:
Apply power to the densitometer; wait until its self test concludes.
Access the "Main Menu" via pressing the two right-hand keys at the same time.
Using the first key, press repeatedly until the word "CAL" appears on the LCD.
Press the "CAL" key. The unit will immediately respond by calibrating its transmission optics.
Wait until this process has concluded!!!
When prompted, insert the Auto-Cal strip. The densitometer will pull the strip through. In a few seconds the instrument should beep, display "CALIBRATION OK", and then return to the main menu.
Return the Auto-Cal strip to its protective envelope.