4
JP1
JP2 JP3
Figure 3 - Internal Jumper Settings for Generic Datalogger Configuration
Between readings, the 8020-42CPR will be “asleep”, drawing approximately 20
µ
A from the 12V
system battery.
When it is time to take a reading, the datalogger will set its control signal, which should be
connected to CR10CLK, high. When CR10CLK goes high, the 8020-42CPR will generate a 400-
4500 Hz swept frequency pluck in order to excite the VW gage. As with the Micro-10
configuration, once the swept frequency is complete, the 8020-42CPR will lock onto the returned
VW signal and maintain excitation by applying one excitation pulse for every 16 cycles of VW
frequency.
The 8020-42CPR will provide continuous VW frequency output until the CR10CLK control line
is brought low. At this time, the 8020-42CPR will go back to sleep
3.3. Stand Alone Configuration
When configured in the Stand Alone mode, the 8020-42CPR will provide continuous excitation
and frequency output from a single Vibrating Wire gage. All that is needed is a 12V (nominal)
voltage source and a frequency counter to read the VW frequency. In order to configure the
8020-42CPR for Stand Alone mode, internal jumpers JP1, JP2 and JP3 must be set across pins
two and three. Remove the cover of the 8020-42CPR and set the jumpers:
JP1
JP2 JP3
Figure 4 - Internal Jumper Settings for Stand Alone Configuration
Pin 1
Pin 2
Pin 3
Pin 1
Pin 2
Pin 3
Summary of Contents for 8020-42CPR
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