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Chapter 8. Servicing the PT878
190 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
8.10.3 Testing the Watchdog Timer Circuit
The PT878 includes a watchdog timer circuit. If a software error causes the
meter to stop responding, this circuit automatically resets the meter. A
properly functioning PT878 restarts if you run the Watchdog Test.
To start the Watchdog Test, scroll to the Watchdog Test option in the Test
Menu and press
[ENTER]. The screen appears similar to Figure 126 below.
Figure 126: Watchdog Test Screen
Press
[F2] (No) to cancel the test and return to the Menu screen, or press [F3]
(Yes) to start the test. The PT878 should go blank for a few seconds, and
then restart. If it does not follow this sequence, consult the factory.
Dew Point, °C
Signal, dB
-52.0
32
Pressure, PSIg
55.00
10.0
Run Time, Hours
Site Program Meter Logging Service
Units
Reports
Reference
MIS Probe
Factory Defaults
Flash Update
06
12
Factory Calibration
Test
X
No
Watchdog Test
Test Screen
Test Keys
Yes
** WARNING **
This test should automatically
restart your meter!
Press ‘Yes’ to start the test.
Press ‘No’ to cancel the test.
Watchdog Test