Campbell SAT ARGOS Bedienungsanleitung Seite 158

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 150
Appendix D contains a number of sensor configuration examples for
commonly used sensors.
If you want to set up a Sensor Record to read the Internal Battery Voltage, your Sensor Record may look
something like this:
SENSOR MENU
(Cn/m) Change Item n To Value m (N) Go To Next Record
(A) Insert After This Record (P) Go To Previous Record
(B) Insert Before This Record (X) Delete all Records
(D) Delete This Record (Z) Zeno Program Menu
(Jn) Jump To Record n (H) Help
Sensor Items for Record 2 of 2:
Item 1: Sensor Type code = 1 (12-bit Analog to Digital)
Item 2: Sensor Name = Battery
Item 3: Sensor Input Channel = BATTERY VOLTAGE
Item 6: Switched Power code = 0 (NO SWITCHED POWER)
Item 7: Sensor Excitation Voltage code = 0 (NO EXCITATION VOLTAGE)
Item 8: Switched Excitation Return = 0
Item 9: Switched Power Warmup Time = 0
Item 10: Sensor Sample Count = 1
Item 11: Maximum Sensor Readings = 0
Item 12: Sensor Timing Loop = 1 (0.5 seconds)
Item 13: Conversion Coefficient A = 0
Item 14: Conversion Coefficient B = 1
Item 15: Conversion Coefficient C = 0
Item 17: No. of Additional 15-msec Delays 0
>
10.3.1. Analog Sensors
The ZENO
®
-3200 can measure an analog sensor by converting the analog voltage created by the sensor
into a digital representation using an Analog-to-Digital Converter, or ADC. Two ADCs are installed on a
ZENO
®
-3200: 12-bit ADC and 18-bit ADC.
172
The 12-bit ADC is strictly unipolar (single-ended), but
the 18-bit ADC supports both unipolar and bipolar (differential) measurements.
To know which ADC is best suited to meet the requirements of measuring a particular analog sensor, the
differences between 12-ADC and 18-bit ADC are described in the following table:
Type of ADC Baseline Voltage Range Per-Bit Accuracy
12-bit ADC Single-ended only: 0 to 4.096 VDC 0.1 mV DC
Single-ended: 0 to 512 mV 1.95 µV DC
18-bit ADC
Differential: ±512 mV DC 3.91 µV DC
Each 12-bit ADC conversion requires a minimum of 100 microseconds, but each 18-bit ADC conversion
requires a minimum of 100 milliseconds. Therefore, in one second, only 10 18-bit ADC conversions can
be made.
172
These are illustrated in Section 2.5 in the ZENO
®
-3200 Block Diagram.
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