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- Multiplexer
- AM416
- Instruction Manual
Campbell AM416 Instruction Manual
Summary of AM416
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Instruction manual am416 relay multiplexer revision: 2/96 c o p y r i g h t ( c ) 1 9 8 7 - 1 9 9 6 c a m p b e l l s c i e n t i f i c , i n c ..
Page 2: Warranty and Assistance
Warranty and assistance the am416 relay multiplexer is warranted by campbell scientific, inc. To be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. Campbell scientific, in...
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I am416 relay multiplexer manual table of contents pdf viewers note: these page numbers refer to the printed version of this document. Use the adobe acrobat® bookmarks tab for links to specific sections. Page 1. Function 1.1 typical applications..........................................................
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Ii 7. Wiring diagram for strain gages and potentiometers...............................................................9 8. Single-ended measurement without excitation ........................................................................11 9. Differential measurement without excitation .............
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Cautionary notes the am416 is not designed to multiplex power. Its intended function is to switch low level analog signals. Switched current in excess of 30 ma will degrade contacts and render them unsuitable for future low level analog measurements. Customers who need to switch power are directed t...
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1 am416 relay multiplexer 1. Function the primary function of the am416 multiplexer is to increase the number of sensors that may be scanned by campbell's cr10(x), 21x and cr7 dataloggers. The am416 is positioned between the sensors and the datalogger; mechanical relays are used to switch the desire...
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Am416 relay multiplexer 2 wires from sensors and datalogger are connected to the gray terminal strips. The set of four terminals located near the strain-relief flange are the connections for datalogger control of the am416 (section 4.1). The terminal strips that run the length of the am416 are for m...
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Am416 relay multiplexer 3 3. Am416 specifications power*: unregulated 12 vdc (9.6 v to 16 v) - see figure 4 for implications of low power to relay actuation current drain: quiescent: active: 17 ma (typical) reset*: a continuous signal of 3.5vdc voltage state (i.E. A clock pulse can trigger a scan ad...
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Am416 relay multiplexer 4 figure 2. Hook-up diagrams for datalogger - am416 connections cr10(x) hook-up 21x hook-up cr7 hook-up the 21x or cr7 (with a 725 card) can be used to connect 12vdc supply and ground to the am416. One control port is used for reset, and one switched excitation channel is use...
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Am416 relay multiplexer 5 voltage level must fall below 1.5vdc then exceed 3.5vdc to clock. Pulse width must be at least 5 ms. An additional delay is required before the measurement to ensure adequate time for the relay to close. In the 21x and cr7 dataloggers, a switched excitation is generally use...
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Am416 relay multiplexer 6 figure 4. Actuation time of relays vs. Temperature (oc) and battery voltage. 4.2 the measurement terminals the terminals that run the length of the am416 are dedicated to the connection of sensors to the datalogger (figure 1). The 16 groups of 4- terminal inputs allow attac...
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Am416 relay multiplexer 7 (3) clock/delay - with the cr10(x), the clock line is connected to a control port. Instruction 86 with the pulse port command (71- 78), sets the clock line high for 10 ms. Instruction 22 is used to delay an additional 10 ms. When controlled by the 21x or cr7, the clock line...
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Am416 relay multiplexer 8 example programs - generalized program loops for the cr10(x), 21x and cr7. 21x sample program * 1 table 1 programs 01: 60 sec. Execution interval activates multiplexer 01: p20 set port 01: 1 set high 02: 1 port number begins measurement loop 02: p87 beginning of loop 01: 0 ...
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Am416 relay multiplexer 9 figure 7. Wiring diagram for strain gages and potentiometers (8) additional loops - additional loops may be used if sensors that require different measurement instructions are connected to the same multiplexer. In this instance, like sensors are assigned to sequential input...
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Am416 relay multiplexer 10 beginning of potentiometer measurement loop 06: p87 beginning of loop 01: 0 delay 02: 6 loop count 07: p90 step loop index (extended) 01: 2 step clock pulse 08: p22 excitation with delay 01: 1 ex chan 02: 1 delay w/ex (units=.01sec) 03: 1 delay after ex (units=.01sec) 04: ...
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Am416 relay multiplexer 11 figure 8. Single-ended measurement without excitation figure 9. Differential measurement without excitation 6.2 differential analog measurement without sensor excitation sensor to multiplexer wiring - up to two differential sensors that don't require excitation may be conn...
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Am416 relay multiplexer 12 figure 10. Half bridge (modified 107 temperature probe) hook-up and measurement. Figure 11. Potentiometer hook-up and measurement 6.3.2 potentiometer measurement sensor to multiplexer wiring - up to two potentiometers may be connected to one input set. Excitation and groun...
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Am416 relay multiplexer 13 figure 12. Four wire half bridge hook-up and measurement figure 13. Differential measurement with sensor excitation 6.4 full bridge measurements sensor to multiplexer wiring - excitation, ground, and the two signal leads may be connected to one input set (figure 13). Multi...
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Am416 relay multiplexer 14 figure 14. Full bridge measurement with excitation compensation 6.6 thermocouple measurement the datalogger manuals contain thorough discussions of thermocouple measurement and error analysis. These topics will not be covered here. 6.6.1 measurement considerations referenc...
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Am416 relay multiplexer 15 figure 15. Differential thermocouple measurement with reference junction at the datalogger. Figure 16. Differential thermocouple measurement with reference junction at the am416. If a mix of tc's and other sensor types are multiplexed through the am416, it is generally bes...
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Am416 relay multiplexer 16 6.6.2 single-ended thermocouple measurement in single-ended thermocouple measurement, the following precautions must be taken to ensure accurate measurement: 1. Only shielded thermocouple wire should be used; the sensor shields should be tied to datalogger earth ground thr...
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Am416 relay multiplexer 17 example program - thermocouple and soil block measurement (program is for cr10(x) - 33 locations allocated to input storage) * 1 table 1 programs 01: 60 sec. Execution interval reference temperature for thermocouples 01: p11 temp 107 probe 01: 1 rep 02: 4 in chan 03: 1 exc...
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Am416 relay multiplexer 18 7. General measurement considerations 1. Long lead lengths - long lead lengths contribute to the formation of induced and capacitive voltages within the sensor and am416 lead wires. To minimize this phenomenon, csi recommends use of teflon, polyethylene, or polypropylene i...
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A-1 appendix a. Am416 stuffing chart and schematics.
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Appendix a. Am416 stuffing chart and schematics a-2.
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Appendix a. Am416 stuffing chart and schematics a-3.
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B-1 appendix b. Differences between the am416 and the am32 the am416 differs from campbell scientific's am32 multiplexer in the following ways: 1. The am416 switches sixteen sets of four lines at a time (4 x 16). The am32 switches thirty-two sets of two lines at a time (2 x 32). 2. The am416 is pack...
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Campbell scientific companies campbell scientific, inc. (csi) 815 west 1800 north logan, utah 84321 united states www.Campbellsci.Com info@campbellsci.Com campbell scientific africa pty. Ltd. (csaf) po box 2450 somerset west 7129 south africa www.Csafrica.Co.Za sales@csafrica.Co.Za campbell scientif...