Connection To A Voltage Input Das; Connection To A Current Input Das - Geokon 8020-59 Instruction Manual

Vibrating wire to analog converter

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Example:

(Assumes the use of default values and transducer type of 4500S-100):

Minimum Limit = 0 digits

Maximum Limit = 25,000 digits

Digits Span = 25,000 – 0 = 25,000 digits

Vout = 3.250V

Digits = Maximum Limit – (Vout * (Digits Span/5V))

Digits = 25,000 – (3.25V * (5000 digits/V))

Digits = 25,000 – 16,250

Digits = 8750

4.4 Connection to a Voltage Input DAS

The 8020-59 outputs a voltage (V OUT, 0-5V) that is proportional to the digits of the transducer

being read (ENABLE = 0V (or disconnected) in Single Channel Mode, after the first of two

CLOCKS in 16-Channel Mode, or after each CLOCK in 32-Channel Mode). The 8020-59 offers

a digits to voltage output with 20-bit resolution (one part in 1,048,576) of the span of the

transducer (default span is 25,000 digits). This output voltage can be input directly to any Data

Acquisition System capable of reading a 0-5V analog voltage.

The 8020-59 also outputs a voltage proportional to the temperature (also on V OUT) of the

transducer being read (ENABLE = 5V in Single Channel Mode or after the second of two

CLOCKS in 16-Channel Mode). The 8020-59 offers a temperature voltage output with 10-bit

resolution (one part in 1024) over a 100º C span (-20º C to +80º C). See Section 4.6 for specific

calculations.

The 8020-59 sources a current (I-OUT, 4-20mA) that is proportional to the digits of the

transducer being read (ENABLE = 0V (or disconnected) in Single Channel Mode, after the first

of two CLOCKS in 16-Channel Mode, or after each CLOCK in 32-Channel Mode). The 8020-59

offers a digits current output with 20-bit resolution (one part in 1,048,576) of the span of the

transducer (default span is 25,000 digits). This output current can be input directly to any Data

Acquisition System capable of reading a non-isolated 4-20mA analog current.

The 8020-59 also outputs a current proportional to the temperature (also on I-OUT) of the

transducer being read (ENABLE = 5V in Single Channel Mode or after the second of two

CLOCKS in 16-Channel Mode). The 8020-59 offers a temperature current output with 10-bit

resolution (one part in 1024) over a 100º C span (-20º C to +80º C). See Section 4.6 for specific

calculations.

See Appendix C for the various voltage and current measurement options.

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