Calvin.res File; Log File; Potentiometer Setting Routine - Welch Allyn Micro Tymp 2 Service Manual

It is possible that calibration equipment failures or misalignments will cause errors in the
calibration. In most cases these errors will have the term 'Equipment error' in the error
message. In some cases it will be difficult to differentiate between a handle failure and
equipment failure; a pressure leak is a good example of this. It should be presumed
that the problem is with the handle rather than the equipment, until all handles begin to
show the same problem.
2.3

Calvin.res File

There is a resource file call 'CALVIN.RES' that is easily edited by any text editor. This
file completely controls how Calvin is run. What tests are run, which order tests are
run, what values pots need to be set to, what pressures or sound levels equipment
should be set to, which ports are used to run the equipment, and much more, can all
be modified with this file. This allows Calvin to easily be supported and updated without
a programmer or changes to the program.
2.4

Log File

The log file is created when Calvin is started each day. Calvin names the log file with
CAL as the start of the name, the month - day as the end of the name, and .LOG as the
extension. As Calvin runs a test, sets a pot or encounters a problem, it writes this
event to the log file with the time the event occurred. Other information is also logged;
the serial number, the final pot setting with result values and total test time per unit.
This log should be very helpful for troubleshooting.
2.5

Potentiometer Setting Routine

Several potentiometers (pots) are set during this calibration. All pots are digital and are
set using the same method and routines. Initial start values are read from the calvin.res
file. This includes the first pot value to try, the target value that we wish to obtain, and
the tolerance between the target value and the obtained value that is acceptable.
During calibration, a common display screen shows the names of the pots being aligned,
their current setting, the value that was last obtained with this setting, the target value
that we are trying to obtain, the difference between the last two values, and the tolerance
that is acceptable for that difference. When the difference is less than or equal to the
tolerance, the display line of that pot turns white and the word 'SET' is placed on the line.
When a pot is being adjusted, the past effect of changing the pot is used to calculate the
next guess of what the pot should be set to, in order to get the target value. The term
'ADJ' is placed on the line to indicate the pot is still being adjusted.
Adjusting one pot often effects another pot. This requires rechecking and readjusting
these pots until neither pot is changing and both are correctly set. If this iteration of
adjusting one pot and readjusting another, goes on too many times, a failure occurs
stating: 'Failure - Too many iterations'.