122 Chadwick-Helmuth Company, Inc.
Chapter 6 - Maintenance
The photocell power switch allows the microprocessor to turn off the
photocell when it is not needed, saving power and extending battery life.
The 12V supply also powers the analog filters, azimuth conditioning, and
contrast circuitry.
Power Supply, 5V -
The 5V supply runs the screen display and digital
circuitry, including the microprocessor and memory.
Power Supply, -12V -
The -12V supply powers the Velocimeters and
analog filters, azimuth conditioning, and the contrast circuitry. The
-12V sensor power currently has a limit of 20 mA. It can take a
continuous short without damage. The effect of a short circuit on the
microprocessor and display depend on the battery voltage.
6.2.4.4 Short-circuit Protection
All supplies help operate the serial communications hardware. Fuses
protect the batteries and sensor power from short circuit damage.
Each battery compartment has a separate fuse. This is a 2A-axial
component soldered on the back of each battery contact spring board.
These fuses prevent catastrophic failure of the batteries or fire (if a short
circuit occurs), even if the problem occurs within one battery chamber.
A self-mending fuse protects the 12V sensor power. If a short does occur,
the fuse mends itself after the short gets repaired.
With nominal voltage, the display may go blank for a few seconds until
the self-mending fuse opens, but the unit does not necessarily reset. At
low battery voltages, the unit may either reset or power off.
CAUTION: These operations do not damage the unit, but could
cause the loss of memory contents and/or data.
6.3 Routine Servicing
This section explains routine maintenance and servicing procedures the
user may do with the Vibrex 2000 and Vibrex 2000 Plus to ensure
optimum performance.
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