Inside the 1902
46
The 1902 needs regular cleaning to remain in good condition.
Before cleaning, remove power and all cables from the 1902.
The exteriors of the 1902 case and the power supply should be
cleaned annually to remove deposits of foreign matter, with a
soft cloth moistened with water. Avoid spilling drops of water
or any other liquid on the 1902.
Check the sockets for pieces of paper or fluff. If any are seen,
remove them with a pin.
Check the cables visually for fraying or other mechanical
damage.
The 1902 Mk IV has user-updatable firmware. Updating the
firmware is only necessary if the version available for free
download from CED’s website is later than your own. To find
which version you have, open Try1902. Once your 1902 is
recognized, look for the monitor version number, displayed
along with the port settings and the serial number.
Having downloaded a firmware update file (with a
.fli
extension), select
File, Update firmware… from inside Try1902.
The process is then almost completely automatic! Repeat for
each channel of 1902.
Calibration should be performed every six months to retain the
specified offset accuracy, but if small discrepancies can be
tolerated, the interval may be extended to three years. Bear in
mind that calibration is a complex and time-consuming
procedure, and should only be undertaken by an experienced
technician. To make the task as easy as possible, the calibration
option of Try1902 provides step-by-step instructions, with
graphic prompts for each. The test sequence adapts itself to the
particular configuration of the 1902 it finds. Even so, there are
thirty-six stages to be gone through in a unit with an isolation
amplifier.
In view of the complexity of the task, we strongly recommend
that users return their 1902s to CED for calibration.
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