Campbell DC112 Návod k obsluze Strana 77
- Strana / 221
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
SECTION 7. MEASUREMENT PROGRAMMING EXAMPLES
7-5
shortening switch life, a transient may be
induced in other wires, packaged with the rain
gauge leads, each time the switch closes. The
100 ohm resistor protects the switch from arcing
and the associated transient from occurring, and
should be included any time leads longer than
100 feet are used with a switch closure.
PROGRAM
1 P 3 Count pulses from rain
gauge
11 1 rep
2 1 Pulse channel #1
3 2 Switch closure, all
pulses counted
4 11 Location to store count
5 0.254 Multiplier
6 0 Offset
7.9 100 OHM PRT IN 4 WIRE HALF
BRIDGE
Instruction 9 is the best choice for accuracy
where the Platinum Resistance Thermometer
(PRT) is separated from other bridge completion
resistors by a lead length having more than a
few thousandths of an ohm resistance. In this
example, it is desired to measure a temperature
in the range of -10 to 40
o
C. The length of the
cable from the 21X to the PRT is 500 feet.
FIGURE 7.9-1. Wiring Diagram for PRT in 4
Wire Half Bridge
Figure 7.9-1 diagrams the circuit used to
measure the PRT. The 10 kohm resistor allows
the use of a high excitation voltage and a low
input range. This insures that noise in the
excitation does not have an effect on signal
noise. Because the fixed resistor (R
f
) and the
PRT (R
s
) have approximately the same
resistance, the differential measurement of the
voltage drop across the PRT can be made on
the same range as the differential measurement
of the voltage drop across R
f
. The use of the
same range eliminates any range translation
error that might arise from the 0.01% tolerance
of the range translation resistors in the 21X.
If the voltage drop across the PRT (V
2
) is kept
on the 50mV range, self heating of the PRT
should be less than 0.001
o
C in still air. The
resolution of the measurement is increased as
the excitation voltage (V
x
) is increased as long
as the Input Range is not exceeded. The
voltage drop across the PRT is equal to V
x
multiplied by the ratio of R
s
to the total
resistance, and is greatest when R
s
is greatest
(R
s
=115.54 ohms at 40
o
C). To find the
maximum excitation voltage that can be used,
we assume V
2
equal to 50mV and use Ohm's
Law to solve for the resulting current, I.
I = 50mV/Rs = 50mV/115. 54 ohms = 0.433mA
Next solve for V
x
:
V
x
= I(R
1
+R
s
+R
f
) = 4.42V
If the actual resistances were the nominal
values, the 21X would not overrange with V
x
=
4.4V. To allow for the tolerances in the actual
resistances, it is decided to set V
x
equal to 4.2
volts (e.g., if the 10 kohms resistor is 5% low,
R
s
/(R
1
+R
s
+R
f
)=115.54/9715.54, and V
x
must be
4.204V to keep V
s
less than 50mV).
The result of Instruction 9 when the first
differential measurement (V
1
) is not made on
the 5V range is equivalent to R
s
/R
f
. Instruction
16 computes the temperature (
o
C) for a DIN
43760 standard PRT from the ratio of the PRT
resistance to its resistance at 0
o
C (R
s
/R
0
).
Thus, a multiplier of R
f
/R
0
is used in Instruction
9 to obtain the desired intermediate, R
s
/R
0
(=R
s
/R
f
x R
f
/R
o
). If R
s
and R
0
were each
exactly 100 ohms, the multiplier would be 1.
However, neither resistance is likely to be exact.
The correct multiplier is found by connecting the
PRT to the 21X and entering Instruction 9 with a
multiplier of 1. The PRT is then placed in an ice
bath (0
o
C; R
s
=R
0
), and the result of the bridge
measurement is read using the *6 Mode. The
reading is R
s
/R
f
, which is equal to R
o
/R
f
since
R
s
=R
o
. The correct value of the multiplier,
R
f
/R
0
, is the reciprocal of this reading. The
initial reading assumed for this example was
0.9890. The correct multiplier is: R
f
/R
0
=
1/0.9890 = 1.0111.
- 21X MICROLOGGER 1
- OPERATOR’S MANUAL 1
- WARRANTY AND ASSISTANCE 3
- 21X OPERATOR'S MANUAL 5
- TABLE OF CONTENTS 5
- OVERVIEW 5
- PROGRAMMING 6
- DATA RETRIEVAL/COMMUNICATION 6
- PROGRAMMING EXAMPLES 7
- INSTRUCTIONS 7
- INSTALLATION 8
- APPENDICES 8
- SELECTED OPERATING DETAILS 9
- This is a blank page 10
- CAUTIONARY NOTES 11
- 21X MICROLOGGER OVERVIEW 13
- CONCEPTS 15
- OV2. MEMORY AND PROGRAMMING 15
- OV3. PROGRAMMING THE 21X 18
- OV4. PROGRAMMING EXAMPLES 20
- OV5. DATA RETRIEVAL OPTIONS 27
- OV6. SPECIFICATIONS 30
- SECTION 1. FUNCTIONAL MODES 31
- CLOCK - *5 MODE 32
- MEMORY OR FLAGS - *6 MODE 32
- 1.5 MEMORY ALLOCATION - *A 34
- STATUS - *B 36
- 1.7 *C MODE -- SECURITY 36
- 1.8 *D MODE -- SAVE OR LOAD 37
- ARRAYS, AND MEMORY POINTERS 41
- 2.2 DATA OUTPUT FORMAT AND 42
- RANGE LIMITS 42
- KEYBOARD/DISPLAY - *7 MODE 43
- 3.1 PARAMETER DATA TYPES 45
- 3.2 REPETITIONS 45
- 3.4 INDEXING INPUT LOCATIONS 45
- 3.5 VOLTAGE RANGE AND 46
- OVERRANGE DETECTION 46
- 3.6 OUTPUT PROCESSING 46
- PROGRAM CONTROL 47
- 3.8 PROGRAM CONTROL LOGICAL 48
- CONSTRUCTIONS 48
- 3.9 INSTRUCTION MEMORY AND 50
- EXECUTION TIME 50
- 3.10 ERROR CODES 53
- 4.1 ON-LINE DATA TRANSFER 55
- INSTRUCTION 96, *4 MODE 55
- 4.2 MANUALLY INITIATED DATA 56
- OUTPUT - *8 AND *9 MODES 56
- 4.3 CASSETTE TAPE OPTION 58
- 4.5 PRINTER OUTPUT FORMATS 61
- 5.1 TELECOMMUNICATIONS 63
- COMMANDS 63
- 6.1 PIN DESCRIPTION 67
- SILICON PYRANOMETER 73
- A COMMON EXTERNAL POWER 73
- USING 21X REFERENCE 74
- USING AN EXTERNAL REFERENCE 74
- JUNCTION 74
- 7.5 107 TEMPERATURE PROBE 75
- WITH LONG LEADS 76
- 7.7 ANEMOMETER WITH 76
- PHOTOCHOPPER OUTPUT 76
- 7.12 PRESSURE TRANSDUCER - 4 80
- WIRE FULL BRIDGE 80
- 7.13 LYSIMETER - 6 WIRE FULL 81
- 7.15 NONLINEAR THERMISTOR IN 83
- HALF BRIDGE (CAMPBELL 83
- SCIENTIFIC MODEL 101) 83
- PROBE WITH 60 HZ REJECTION 84
- 8.1 COMPUTATION OF RUNNING 87
- 8.2 RAINFALL INTENSITY 88
- 8.3 USING CONTROL PORTS AND 89
- LOOP TO RUN AM416 MULTIPLEXER 89
- SYNCHED TO REAL TIME 91
- 8.5 SDM-A04 ANALOG OUTPUT 91
- MULTIPLEXER TO STRIP CHART 91
- 8.6 CONVERTING 0-360 WIND 93
- DIRECTION OUTPUT TO 0-540 FOR 93
- STRIP CHART 93
- 8.7 COVARIANCE CORRELATION 94
- PROGRAMMING EXAMPLE 94
- 8.8 FAST FOURIER TRANSFORM 97
- EXAMPLES 97
- are not 113
- Parameters 6 117
- SECTION 13. 21X MEASUREMENTS 149
- LENGTH ON THE SIGNAL SETTLING 151
- Error (degrees) = 153
- 13.4 THERMOCOUPLE 158
- MEASUREMENTS 158
- 13.5 BRIDGE RESISTANCE 163
- 13.6 RESISTANCE MEASUREMENTS 167
- REQUIRING AC EXCITATION 167
- 14.1 PROTECTION FROM THE 169
- ENVIRONMENT 169
- 14.2 POWER REQUIREMENTS 170
- 14.3 21X POWER SUPPLIES 171
- 14.4 SOLAR PANELS 172
- TO THE 21X 172
- 14.6 VEHICLE POWER SUPPLY 172
- CONNECTIONS 172
- 14.7 USE OF DIGITAL CONTROL 173
- PORTS FOR SWITCHING RELAYS 173
- 14.8 GROUNDING 173
- 14.9 MAINTENANCE 174
- 14.10 CALIBRATION PROCEDURES 174
- APPENDIX A. GLOSSARY 179
- C.1 TELECOMMUNICATIONS 185
- COMMAND WITH BINARY 185
- RESPONSES 185
- C.2 FINAL STORAGE FORMAT 187
- C.3 GENERATION OF SIGNATURE 189
- APPENDIX D. ASCII TABLE 191
- E.1 DISASSEMBLY OF 21X 193
- E.2 INSTALLING NEW RAM CHIPS 193
- E.3 CHANGING PROM CHIPS 194
- 15 SERIAL INPUT 197
- THE AIR-DB-1A BAROMETER 198
- *D TAPE UPLOAD AND DOWNLOAD 203
- LIST OF TABLES 205
- LIST OF FIGURES 209
- 13. 21X MEASUREMENTS 210
- 21X INDEX 211
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