Campbell SAT ARGOS Manual do Utilizador Página 11

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 3
Frequency inputs: Up to 100 kHz at 0.005% accuracy.
1.3.3. Sensor and Auxiliary Power Outputs
Sensor excitation: Five switched excitation outputs for software selectable voltages of 1.25, 2.50,
5.00, with basic accuracy of 0.01% at up to 100 mA. Long-term stability of 20 ppm over 1000 hours,
with most of the drift occurring within the first 100 hours.
Reference outputs: one fixed, for sensor signal offsets.
Power outputs (switched).
Three channels of +12V; one channel at 700 mA; two channels at 150 mA.
Two channels of +5V at total 600 mA peak, 200 mA mean.
Other power output: optional.
Optional digital-to-analog expansion board gives 4 or 8 channels of individually programmable 12-bit
analog output at 0 to 5 V.
2
1.3.4. Serial Communication Ports
Three serial communication ports labeled as COM1, COM2 and COM3.
Baud rates: each serial communications port supports baud rates of 300, 600, 1200, 2400, 4800, 9600
and 19,200 bits per second (bps).
COM1 supports RS232, RS232H
3
, and unidirectional and bi-directional radio communications.
COM2 supports RS232, RS232H, RS485, GOES satellite transmitters
4
and ARGOS satellite
transmitters.
5
COM2 is fully multiplexed.
6
COM3 supports RS232, RS232H, RS485 and RS422.
1.3.5. ADC Conversion Rates
The ZENO
®
-3200 has two A/D converters: one referred to as 12-bit, and one referred to as 18-bit. The
12-bit ADC is very fast, with up to 10,000 samples per second. The main limitation on your use of the
12-bit ADC is the fact that only two terminal block connections are available.
A single conversion on the 18-bit ADC requires approximately 100 milliseconds, which equates to 10
samples per second. This always outputs a signed 18-bit value, but the least significant 3 bits are highly
susceptible to noise and may not be accurate. Hence, a single sample has 15-bit accuracy. To obtain full
18-bit accuracy, three values must be averaged by setting the Sensor Sample Count in the Sensor Menu to
three.
7
This brings the sample rate down to no more than three samples per second.
Therefore, the maximum possible sample rate -- including all sensors -- is a total of 16 samples per
second at an effective 15 bits of resolution, or 2 samples per second at a full 18 bits of resolution.
2
Other voltage ranges are optional.
3
RS232H is half-duplex RS232.
4
Refer to Section 6.7.
5
Refer to Section 6.8.
6
Refer to Section 6.1.
7
Refer to Section 10.3.1.
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