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Campbell AM16/32B Instruction Manual

Manual is about: Relay Multiplexer

Summary of AM16/32B

  • Page 1

    Inst ruct io n manual am16/32b relay multiplexer revision: 7/16 c o p y r i g h t © 1 9 8 7 - 2 0 1 6 c a m p b e l l s c i e n t i f i c , i n c ..

  • Page 3: Guarantee

    Guarantee this equipment is guaranteed against defects in materials and workmanship. We will repair or replace products which prove to be defective during the guarantee period as detailed on your invoice, provided they are returned to us prepaid. The guarantee will not apply to: equipment which has ...

  • Page 5: Please Read First

    Please read first about this manual please note that this manual was originally produced by campbell scientific inc. Primarily for the north american market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: area: 1 in 2 (square inch) = 645 mm 2 length: 1 ...

  • Page 7: Precautions

    Precautions danger — many hazards are associated with installing, using, maintaining, and working on or around tripods, towers, and any attachments to tripods and towers such as sensors, crossarms, enclosures, antennas, etc. Failure to properly and completely assemble, install, operate, use, and mai...

  • Page 9: Table Of Contents

    I table of contents pdf viewers: these page numbers refer to the printed version of this document. Use the pdf reader bookmarks tab for links to specific sections. 1. Introduction ................................................................ 1 1.1 typical applications ...............................

  • Page 10

    Table of contents ii b.5 cr5000 program example ............................................................ B-10 c. Thermocouple measurement ................................. C-1 c.1 measurement considerations .......................................................... C-1 c.1.1 reference junction ....

  • Page 11: Am16/32B Relay Multiplexer

    1 am16/32b relay multiplexer 1. Introduction the primary function of the am16/32b multiplexer is to increase the number of sensors that can be measured by cr6-series, cr800-series, cr1000, cr3000, and cr5000 dataloggers. The am16/32b is positioned between the sensors and the datalogger. Mechanical r...

  • Page 12: 2.  Precautions

    Am16/32b relay multiplexer 2 the am16/32b is also compatible with the cdm-a108 and cdm-a116 24-bit analog input modules by using the crbasic cdm_muxselect() instruction. Refer to the crbasic help for information on using the am16/32b with these modules. The cdm-a100 series manual includes a sample p...

  • Page 15: 5.  Overview

    Am16/32b relay multiplexer 5 click on sensors in the progress list to return to the sensor-selection screen. Select any other sensors you have in the sensors section. Add sensors to the datalogger by selecting the datalogger tab ( cr6 in this example). Add sensors to the multiplexer by selecting the...

  • Page 16

    Am16/32b relay multiplexer 6 against surges with transient suppression. Datalogger-to-am16/32b cabling requires a minimum of six and as many as nine individually insulated wires with shields. Figure 5-1. Am16/32b relay multiplexer 6. Am16/32b specifications power 1, 2 : unregulated 9.6 to 16 vdc cur...

  • Page 17

    Am16/32b relay multiplexer 7 dimensions length: 23.9 cm (9.4 in) width: 10.2 cm (4.0 in) depth: 4.6 cm (1.8 in) weight: 680 g (1.5 lb) (approx.) mounting tab hole spacing: 1 x 3 x 9 in. Up to 1/8 in or 3 mm diameter screws. Expandability 3 (nominal): 4 am16/32bs per cr6 2 am16/32bs per cr800/cr850 4...

  • Page 18: 7.  Installation

    Am16/32b relay multiplexer 8 4 switching currents greater than 30 ma (occasional 50 ma current is acceptable) will degrade the contact surfaces of the mechanical relays and increase their resistance. This will adversely affect the suitability of these relays to multiplex low voltage signals. Althoug...

  • Page 19

    Am16/32b relay multiplexer 9 provide a path to ground for sensor cable shields. A com terminal should be wired to datalogger ground ( ⏚) as shown in figure 7-1 . Figure 7-1. Example of am16/32b-to-datalogger signal connection (4x16 mode) 7.1.3 measurement terminals wire sensors and transducers accor...

  • Page 20: 8.  Operation

    Am16/32b relay multiplexer 10 video power budgeting , both available at www.Campbellsci.Com , for more help in selecting a power supply. 7.4 installation in enclosure the am16/32b must be protected from moisture. Moisture in the electronics will seriously damage the am16/32b. In most cases, protecti...

  • Page 21

    Am16/32b relay multiplexer 11 the first clock pulse is received from the datalogger, set 1, consisting of 1h, 1l, 2h, and 2l, is connected to com odd h, odd l, even h, and even l terminals respectively. When the second clock pulse is received, the first set is switched out (set 1 sensor inputs becom...

  • Page 22

    Am16/32b relay multiplexer 12 number of sets on the multiplexer that will be used. For example, if the instruction is subscan(0,μsec,7) and the multiplexer is in 2x32 mode, the first seven terminal pairs (numbers in white) on the multiplexer will be used. When in 4x16 mode, this instruction will use...

  • Page 23

    Am16/32b relay multiplexer 13 8.2 general measurement considerations 8.2.1 long cable lengths longer sensor-to-am16/32b cables result in greater induced and capacitively coupled voltages (cross talk) between cable wires. It may also be necessary to program a delay within the measurement instruction ...

  • Page 24

    Am16/32b relay multiplexer 14.

  • Page 25: Into Crbasic Editor

    A-1 appendix a. Importing short cut code into crbasic editor this tutorial shows: • how to import a short cut program into a program editor for additional refinement • how to import a wiring diagram from short cut into the comments of a custom program short cut creates files, which can be imported i...

  • Page 27: And Programs

    B-1 appendix b. Example measurements and programs this section covers sensor-to-am16/32b connections and am16/32b-to- datalogger connections. Most programs were created in short cut. The following are examples only and should not be construed as the only way to make a particular measurement. See the...

  • Page 28

    Appendix b. Example programs b-2 table b-1. Wiring for single-ended voltage measurements crbasic example cr1000 am16/32b in 4x16 mode sensors control and com terminals measurement terminals ⏚ (signal ground ) com odd h odd-numbered h terminal sensor 1, 2, and 3 grounds 1h com odd l odd-numbered l te...

  • Page 29

    Appendix b. Example programs b-3 lcount=lcount+3 nextsubscan 'turn am16/32 multiplexer off portset (2,0) 'call data tables and store data calltable table1 calltable table2 nextscan endprog b.2 differential voltage measurement figure b-2 shows a typical connection for differential voltage measurement...

  • Page 30

    Appendix b. Example programs b-4 crbasic example b-2. Differential voltage measurements 'declare variables and units public battv public ptemp_c public lcount public diffv(32) public mult(32)={9,1,8,8,8,1,5,2,8,5,3,6,2,6,5,5,2,9,1,7,8,8,2,3,9,2,8,1,7,2,7,4} public offs(32)={5,4,9,8,4,1,1,1,7,4,8,2,6...

  • Page 31

    Appendix b. Example programs b-5 figure b-3. Typical half-bridge measurement connection the following example is a cr6-series program. With minor adjustments, this program can be used with the cr800 series, cr1000, or cr3000. This program measures 48 campbell scientific 107 temperature sensors throu...

  • Page 32

    Appendix b. Example programs b-6 'define data tables datatable (table1,true,-1) datainterval (0,60,min,10) sample (48,t107_c(),fp2) endtable datatable (table2,true,-1) datainterval (0,1440,min,10) minimum (1,battv,fp2,false,false) endtable 'main program beginprog 'main scan scan (30,sec,1,0) 'defaul...

  • Page 33

    Appendix b. Example programs b-7 the following example is a cr1000 program. With minor adjustments, this program can be used with the cr6 series, cr800 series, or cr3000. This program measures 16 load cell sensors through an am16/32b. The am16/32b must be in 4x16 mode. Table b-4. Wiring for load cel...

  • Page 34

    Appendix b. Example programs b-8 samplefieldcal endtable 'main program beginprog 'initialize calibration variables for 'generic full bridge measurements 'loadcell()' on the am16/32 multiplexer cindex=1 : cavg=1 : creps=16 for lcount = 1 to 16 coff(lcount)=offs(lcount) next 'load the most recent cali...

  • Page 35

    Appendix b. Example programs b-9 the following example is a cr1000 program. With minor adjustments, this program can be used with the cr6 series, cr800 series, or cr3000. This program measures 48 campbell scientific cs616 water content reflectometers through an am16/32b. The am16/32b must be in 4x16...

  • Page 36

    Appendix b. Example programs b-10 scan (5,sec,1,0) 'default cr1000 datalogger battery voltage measurement 'battv' battery (battv) 'default cr1000 datalogger wiring panel temperature measurement 'ptemp_c' paneltemp (ptemp_c,_60hz) if timeintointerval (0,60,min) then 'turn am16/32 multiplexer on ports...

  • Page 37

    Appendix b. Example programs b-11 crbasic example b-6. Cr5000 program example 'cr5000 example program to measure 16 100-ohm platinum resistance thermometers 'connected to an am16/32b multiplexer used in the 4x16 configuration. The program also 'measures 6 copper constantan thermocouples. 'the thermo...

  • Page 38

    Appendix b. Example programs b-12.

  • Page 39: Appendix C.  Thermocouple

    C-1 appendix c. Thermocouple measurement if the am16/32b will be used in thermocouple measurements, the practices outlined below should be followed to make the best possible measurement. The datalogger manuals contain thorough discussions of thermocouple measurement and error analysis. These topics ...

  • Page 40

    Appendix c. Thermocouple measurement c-2 second, some thermocouple wires have a greater resistance than copper, which adds resistance to the non-thermocouple sensor circuit. For example, constantan is approximately 26 times more resistive than copper. Figure c-1. Differential thermocouple measuremen...

  • Page 41

    Appendix c. Thermocouple measurement c-3 am16/32b is housed in a field enclosure, the enclosure should be shielded from solar radiation. Figure c-3. Am16/32b aluminum cover plate.

  • Page 42

    Appendix c. Thermocouple measurement c-4.

  • Page 44

    Campbell scientific companies campbell scientific, inc. 815 west 1800 north logan, utah 84321 united states www.Campbellsci.Com • info@campbellsci.Com campbell scientific africa pty. Ltd. Po box 2450 somerset west 7129 south africa www.Campbellsci.Co.Za • cleroux@csafrica.Co.Za campbell scientific s...