Geokon 8020-42, Руководство по установке, Страница: 9 / 13

5
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 F1, and as a 5v(pp) 50
Ω
output at F2.
The 8020-42 will provide continuous VW frequency output until the CLOCK control line is
brought low. At this time, the 8020-42 will go back to sleep
Connector
Position
Signal
Name
Signal
Description
Generic
Datalogger
Connection
1 T Temperature Proportional Voltage See Appendix B
2 F1
Vibrating Wire Gage Frequency
(200mv/pp)
Frequency input
to Datalogger
3 EX Thermistor Excitation See Appendix B
4 +12V +12V Power Supply 12V
5 GND Ground Ground
6 T+ 3k
Ω
@ 25
°
C Ther input From Thermistor
7 T-
3k
Ω
@ 25
°
C Thermistor – input
From Thermistor
8 C+ Vibrating wire Gage Coil + From VW gage
9 C- Vibrating wire Gage Coil - From VW gage
10 ENABLE Enable (Micro-10 configuration) N/A
11 CLOCK
Clock (Micro-10 configuration)
Enable (Generic Datalogger
configuration)
5V CMOS control
from datalogger
12 F2
Vibrating Wire Gage Frequency
(5v(pp) @ 50
Ω
)
Frequency input
to Datalogger
Table 3 - Generic Datalogger Configuration/Connections
3.3 Stand Alone Configuration
When configured in the Stand Alone mode, the 8020-42 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
8020-42 for Stand Alone mode, internal jumpers JP1, JP2 and JP3 must be set across pins two
and three. Remove the cover of the 8020-42 and set the jumpers:
JP1 JP2 JP3
Figure 4 - Internal Jumper Settings for Stand Alone Configuration
PIN 1
PIN 2
PIN 3