Fluke Biomedical 07-424 - Manual (Page 9)

Maintenance & Calibration
Precautions
3
3-1
Section 3
Maintenance & Calibration
3.1 Precautions
As with any precision measurement instrument, certain precautions and periodic maintenance are
necessary.
1. Routing Cleaning:
Do not immerse the Model 07-424 Digital
Densitometer. The unit is not waterproof. Liquid
could damage the circuits. The unit should be kept
cleaned free from dirt and contamination. The unit
may be cleaned by wiping with a damp cloth using
any commercially available cleaning or
decontaminating agent.
Keep the underside of the photo head clean using
alcohol and a soft cloth as required.
DO NOT USE (UNDER ANY CIRCUMSTANCES)
ANY OTHER SOLVENT.
2. Periodically check the alignment of the aperture and the photohead, especially if the instrument has
been dropped. Inherent mechanical design makes this alignment check easy. Simply remove the
aperture in use with your fingernail and press down on the arm. The o-ring light seal should fit
exactly into the depression normally occupied by the aperture. If the arm is out of alignment, refer to
Section 3.2 for instructions on realignment.
3. If the instrument is used to measure halftones, the 3 mm aperture should be used to reduce the
effect of sampling area. Take into consideration the effects of the maximum density of silver in the
dots and fringes around the dots. Avoid comparing a soft edged dot film with a hard-edged dot film.
CAUTION