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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