Geokon 8020-42, Руководство по установке, Страница: 8 / 13

4
Connector
Position
Signal
Name
Signal
Description
CR-10
Connection
1 T Temperature Proportional Voltage 1L
2 F1 Vibrating Wire Gage Frequency 1H*
3 EX Swept Frequency and Thermistor Excitation E1
4 +12V +12V Power Supply 12V
5 GND Ground AG
6 T+
3k
Ω
@ 25
°
C Ther input
From MUX
COM_ HI_2
7 T-
3k
Ω
@ 25
°
C Thermistor – input
From MUX
COM_ LO_2
8 C+ Vibrating wire Gage Coil + From MUX
COM_HI_1
9 C- Vibrating wire Gage Coil - From MUX
COM_LO_1
10 ENABLE Enable (Micro-10 configuration) C1..C7
11 CLOCK Clock (Micro-10 configuration)
Enable (Generic Datalogger configuration) C8
12 F2 Vibrating Wire Gage Frequency 1H*
Table 2 - Micro-10 Configuration/Connections
*Either F1 or F2 can be used to connect to the CR-10 1H input.
3.2 Generic Datalogger Configuration
The 8020-42 can be incorporated as the vibrating wire interface for any datalogger that is
capable of reading a frequency input and has the ability to output a single 5V CMOS level
control signal. In order to configure the 8020-42 for a generic Datalogger, internal jumpers
JP1and JP3 must be set across pins two and three, while JP2 is set across pins one and two.
Remove the cover of the 8020-42 and set the jumpers:
JP1 JP2 JP3
Figure 3 - Internal Jumper Settings for Generic Datalogger Configuration
Between readings, the 8020-42 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 CLOCK, high. When CLOCK goes high, the 8020-42 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 8020-42 will lock onto the returned VW signal and
PIN 1
PIN 2
PIN 3