Chapter 8. Maintenance and Troubleshooting
Model PM880 Portable Hygrometer User’s Manual 137
8.5 Testing the Watchdog Timer Circuit
The PM880 includes a watchdog timer circuit. If a software error causes the
meter to stop responding, this circuit automatically resets the meter.
1. If the menu is not active, press [MENU].
2. Use the arrow keys to scroll to Service and press [ENTER].
3. Use the arrow keys to scroll to Test and press [ENTER].
4. Use the arrow keys to scroll to Watchdog Test and press [ENTER]. The
screen appears similar to Figure 65.
Figure 65: Watchdog Test Screen
5. Press [F3] (Yes) to start the test. The PM880 screen becomes blank for a
few seconds and then begins the boot sequence. If it does not follow this
sequence, consult the factory.
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