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3. CONFIGURATIONS
3.1 Micro-10 Datalogger
The 8020-42CPR can be incorporated as the vibrating wire interface in a Micro-10 Datalogger
system, taking the place of the Campbell Scientific Inc. AVW-1. In order to configure the 8020-
42CPR for the Micro-10 Datalogger, internal jumpers JP1, JP2 and JP3 must be set across pins
one and two. Remove the cover of the 8020-42 and set the jumpers:
JP1
JP2 JP3
Figure 2 - Internal Jumper Settings for Micro-10 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 C1..C7 (CR10EN) high in order to
enable the respective multiplexer, and the individual channels are clocked by pulsing C8
(CR10CLK) high.
When “CR10EN” and “CR10CLK” are both high, the 8020-42CPR will wake up and wait for
the swept frequency excitation signal to appear at EX. The 8020-42CPR will track and apply this
swept frequency to the VW gage. 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 VW frequency is provided as both a 200mv(pp) signal at
FOUT_ATT (connector position two), and as a 5v(pp) 50
Ω
output at FOUT (connector position
one).
It is helpful to add a small amount of delay (
≈
0.5 Sec. ) from the time that the swept frequency
excitation ends and the time that the reading is taken. MultiLogger software, ver. 1.4.0 and above
provides this delay when selecting a gage type that has the letters sca included within it, i.e.,
4500sca, 4700sca etc.
3.2 Generic Datalogger Configuration
The 8020-42CPR can be incorporated as the vibrating wire interface for any datalogger that is
capable of reading a frequency input or a 4-20mA current input and has the ability to output a
single 5V CMOS level control signal. In order to configure the 8020-42CPR for a generic
Datalogger, internal jumpers JP1 and JP3 must be set across pins one and two, while JP2 is set
across pins two and three. Remove the cover of the 8020-42CPR and set the jumpers:
Pin 1
Pin 2
Pin 3
Summary of Contents for 8020-42CPR
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