Related Manuals for Campbell AM16
Summary of Contents for Campbell AM16
- Page 1 AM16/32A Relay Multiplexer Revision: 11/07 C o p y r i g h t © 1 9 8 7 - 2 0 0 7 C a m p b e l l S c i e n t i f i c ,...
- Page 2 CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose.
-
Page 3: Table Of Contents
Adobe Acrobat® bookmarks tab for links to specific sections. 1. Function................1 1.1 Typical Applications.................1 1.2 Compatibility ....................2 2. Physical Description ...........2 3. AM16/32A Specifications ..........3 4. Operation..............5 4.1 The Control Terminals................5 4.1.1 Reset....................6 4.1.2 Clock ....................6 4.1.3 Ground ....................7 4.1.4 Power Supply ..................7... - Page 4 A. AM16/32A Improvements........A-1 Figures 1. AM16/32A Relay Multiplexer ..............3 2. AM16/32A Relay Actuation Time vs. Temperature and Battery Voltage .. 5 3. AM16/32A to Datalogger Power/Control Hookup ........6 4. Power and Ground Connections for External Power Supply ..... 8 5.
- Page 5 Cautionary Notes The AM16/32A is not designed to multiplex power. Its intended function is to switch low level analog signals. Switched currents in excess of 30 mA will degrade the relay contacts involved, rendering that channel unsuitable for further low level analog measurement. Customers who need to switch power are directed to Campbell Scientific’s SDM-CD16AC, A6REL-12, or...
- Page 6 This is a blank page.
-
Page 7: Function
The user program advances the multiplexer through the sensor channels making measurements and storing data. A slide switch located on the AM16/32A’s top panel selects one of two modes of operation. In “2x32” mode the multiplexer can scan 32 sensor input channels, each with two lines. -
Page 8: Compatibility
AVW1 vibrating wire interface. 2. Physical Description The AM16/32A is housed in a 10.2 cm x 23.9 cm x 4.6 cm (4.0” x 9.4” x 1.8”) anodized aluminum case (Figure 1). The aluminum case is intended to reduce temperature gradients across the AM16/32A’s terminal strips. -
Page 9: Am16/32A Specifications
11 mA typical in “4 x 16” mode Reset * : A continuous signal between 3.5 VDC and 16 VDC holds the AM16/32A in an active state (where a clock pulse can trigger a channel advance). A signal voltage < 0.9VDC deactivates the AM16/32A (clock pulse will not trigger a scan advance;... - Page 10 4 AM16/32As per CR1000 4 AM16/32As per CR23X 4 AM16/32As per CR10(X) 4 AM16/32As per 21X 8 AM16/32As per CR7 725 Card Maximum Cable Depends on sensor and scan rate. In general, longer lead lengths necessitate longer measurement delays. Length: Refer to datalogger manual for details.
-
Page 11: Operation
4.1. The Control Terminals The CR5000, CR3000, CR800, CR850, CR1000, CR23X, CR10(X), 21X, and CR7 dataloggers connect to the AM16/32A as shown in Figure 3 (“4x16” mode). Figure 3 depicts control connections. Measurement connections are discussed in Section 6. The power, ground, reset, and clock connections remain essentially the same regardless of datalogger used. -
Page 12: Reset
725 Card Control FIGURE 3. AM16/32A to Datalogger Power/Control Hookup With the 21X or CR7 the AM16/32A connects to the 12 VDC and “ ” terminals for power. One control port is used for reset, and one switched excitation channel is used for clock (on 725 card with CR7). If a switched excitation port is not available, an additional control port can be used to provide clock pulses to the multiplexer. -
Page 13: Ground
AM16/32A CLK or RES inputs wired in parallel. 4.1.3 Ground The AM16/32A has a ground lug that should be connected to earth ground via an 8 AWG wire. This connection should be as short as possible. -
Page 14: Measurement Terminals
If a 21X power supply is used to power the AM16/32A, all low-level analog measurements (thermocouples, pyranometers, thermopiles, etc.) must be made differentially. Differential measurements are required because slight ground potentials are created along the 21X analog terminal strip when the 12V supply is used to power peripherals. -
Page 15: Com Terminals
The four terminals dedicated to multiplexer-datalogger connection are located under the blue “COM” next to the mode switch. The terminals are labeled: ODD H, ODD L, EVEN H, and EVEN L. In “4x16” mode the AM16/32A maintains the four “COM” terminals electrically isolated from one another. In “2x32”... -
Page 16: Datalogger Programming
SETs are labeled beginning with 1H, 1L and ending with 32H, 32L. In “2x32” mode when the AM16/32A selects a given channel the “H” sensor terminal is relay connected to both COM “H” terminals and the “L” sensor terminal is connected to both COM “L”... -
Page 17: Single Loop Instruction Sequence
Set port low to deactivate AM16/32A #1, #9 Activate/deactivate the AM16/32A −The control port connected to reset (RES) is set high to activate the AM16/32A prior to the advance and measure sequence and set low following the measurement loop(s). For the... - Page 18 AM16/32A Relay Analog Multiplexer Example: 2 sensors per SET, 6 sensors total; two reps specified in measurement instruction; two measurement values assigned to indexed input locations (--); P90 step of 2. Loop count of three. Input locations First pass: Second pass:...
- Page 19 AM16/32A Relay Analog Multiplexer NOTE If more than the datalogger’s default number of input locations are required, then additional input locations must be assigned using the datalogger *A mode. Consult your datalogger manual for details. #6 Optional Processing - Additional processing is sometimes required to convert the reading to the desired units.
-
Page 20: Example "4X16" Mode Program Loops For Cr23X, Cr10(X), 21X, And Cr7 Dataloggers
AM16/32A Relay Analog Multiplexer GENERALIZED “4x16” MODE PROGRAM LOOPS FOR THE CR23X, CR10(X), 21X, and CR7 21X SAMPLE PROGRAM CR7 SAMPLE PROGRAM CR10X, CR23X SAMPLE PGM Table 1 Table 1 Table 1 Programs Programs Programs Sec. Sec. Sec. Execution Execution... -
Page 21: Example "2X32" Mode Program Loops For Cr23X, Cr10(X), 21X, And Cr7 Dataloggers
AM16/32A Relay Analog Multiplexer EXAMPLE “2x32” MODE PROGRAMS - GENERALIZED PROGRAM LOOPS FOR THE CR23X, 21X, CR10(X), AND CR7. 21X SAMPLE PROGRAM CR7 SAMPLE PROGRAM CR10(X), CR23X SAMPLE Table 1 Table 1 PROGRAM Programs Programs Table 1 Sec. Sec. Programs... -
Page 22: Multiple Loop Instruction Sequence
AM16/32A (Steps 1 and The instruction sequence for control of an AM16/32A is given on the following page. The program format is a product of Edlog a datalogger program editor contained in CSI's PC208W Datalogger Support Software. - Page 23 AM16/32A Relay Analog Multiplexer *1 Table 1 Programs 1: 60 Sec. Execution Interval ;ACTIVATES MULTIPLEXER 1: Do (P86) 1: 41 Set high Port 1 2: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0 Delay w/Ex (0.01 sec units) 3: 15 Delay after Ex (0.01 sec units)
-
Page 24: Crbasic Programming
AM16/32A Relay Analog Multiplexer ;DELAY 11: Excitation with Delay (P22) 1: 1 EX Chan 2: 0 Delay w/EX (units=.01sec) 3: 1 Delay after EX (units=.01sec) 4: 0 mV Excitation ;POT. MEASUREMENT INSTRUCTION 12: Excite,Delay,Volt(SE) (P4) 1: 2 Reps 2: 5... -
Page 25: Cr5000 And Cr3000 Programming
Although the following example is a CR5000 program, a similar program can be used for the CR3000. This CR5000 program uses the AM16/32A to measure 16 100 ohm Platinum Resistance Thermometers connected in the 4x16 configuration. The program also measures 6 copper constantan thermocouples. -
Page 26: Cr1000, Cr800, And Cr850 Programming
AM16/32A Relay Analog Multiplexer 'CR5000 Example Program to measure 16 100 ohm Platinum Resistance Thermometers ‘connected to an AM16/32A multiplexer used in the 4x16 configuration. The program also ‘measures 6 copper constantan 'thermocouples. 'The Thermocouples are connected to differential channels 1-6. - Page 27 ‘Set flag 1 High every 30 min (Note: User can manually set flag 1 high/low) If IfTime (0,30,min)Then flag (1)=high ‘++++++++++++++++++++++++ If Flag(1)=high Then ‘measure 48ea CS616 probes on AM16/32A in (4x16) mode PortSet (4,1) ‘Set Mux Reset line High ‘...
-
Page 28: General Programming Considerations
Most of the following examples do not depict datalogger-to-AM16/32A control connections (Section 4.1), bu t their presence is implied and required. Campbell Scientific recommends that only sensor shield (drain) wires be connected to AM16/32A shield terminals labeled (“ ”). 6.1 Single-Ended Analog Measurement without Sensor... -
Page 29: Differential Analog Measurement Without Sensor Excitation
AM16/32A Relay Analog Multiplexer NOTE level single-ended measurements recommended in 21X applications where the 21X's internal 12VDC supply is used to power the multiplexer or other peripherals (see Section 4.1.4). CR23X/CR3000/ 21X/ CR800/CR850/ 5000 "2 X 32" Mode CR10(X) CR1000/CR5000... -
Page 30: Half Bridge Measurements
AM16/32A Relay Analog Multiplexer 6.3 Half Bridge Measurements Measurements of t his type may be subdivided into three categories based on completion resistance and the presence or absence of measured excitation. If the sensor' s completion resistor(s) are installed at the datalogger... -
Page 31: Potentiometer Measurement
AM16/32A Relay Analog Multiplexer CR23X/ CR800/ CR850/ 21X/ CR3000/ "4 X 16" Mode CR1000 CR10(X) CR5000 COM H (ODD) ODD H COM L ODD L COM H (EVEN) EVEN H COM L EVEN L MUXSIGNAL SHIELD SENSOR SHIELDS SHIELD FIGURE 13. Potentiometer Hook-up and Measurement 6.3.2 Potentiometer Measurement... -
Page 32: Full Bridge Measurements
AM16/32A Relay Analog Multiplexer CR23X/ CR800/ CR850/ 21X/ CR3000/ "4 X 16" Mode CR1000 CR10(X) CR500 COM H (ODD) ODD H COM L ODD L COM H (EVEN) EVEN H COM L EVEN L SHIELD SENSOR SHIELDS FIGURE 14. Fo... -
Page 33: Full Bridges With Excitation Compensation
Sensor to Multiplexer wiring – With panel switch set to ”4x16” mode you are 2 lines short for a six wire measurement. One solution is to multiplex the four signal wires through the AM16/32A, but bypass the AM16/32A with excitation and ground wires. This means that the... -
Page 34: Thermocouple Measurement
(i.e. the signal wi res between datalogger and AM16/32A are made of thermocouple wire), then it is not recommended that one make measurements of any other sensor type through the AM16/32A. Two problems would arise due to the properties of thermocouple wire: An extraneous thermocouple voltage would be added to the non- thermocouple signal at the junction of dissimilar metals (e.g. -
Page 35: Differential Thermocouple Measurement With Reference Junction At The Datalogger
AM16/32A. If a mix of TCs and other sensor types are multiplexed through the AM16/32A, it is generally best to locate the reference junction on the AM16/32A, as shown in Figure 18. AM16/32A Reference - An external reference, usually a thermistor, can be located at the AM16/32A, as shown in Figure 18. -
Page 36: Single-Ended Thermocouple Measurement
This technique allows heat to largely dissipate before it reaches the terminals. If the AM16/32A is housed in a field enclosure, the enclosure should be shielded from solar radiation. -
Page 37: Differential Thermocouple Measurement
COM EVEN L to datalogger ground should be of the same composition as the low side of the thermocouples. If the reference junction is at the AM16/32A (CSI 107 thermistor, RTD, etc.), then copper wire should be used to connect COM terminals to the datalogger. -
Page 38: Thermocouple And Soil Block Measurement
AM16/32A Relay Analog Multiplexer CR10X Example Program – Thermocouple and Soil Block Measurement AM16/32A AM16/32 CR10(X) MUXPOWER SHIELD SETS 1-16 ODD H ODD H ODD L ODD L EX 1 SETS 1-16 1K 0.1% EX 2 EVEN H EVEN H... - Page 39 AM16/32A Relay Analog Multiplexer CLOCK PULSE 4: Do (P86) 1: 72 Pulse Port 2 5: Excitation with Delay (P22) 1: 1 EX Chan 2: 2 Delay w/EX (units=.01 sec) 3: 0 Delay after EX (units=.01 sec) 4: 1 mV Excitation...
- Page 40 AM16/32A Relay Analog Multiplexer 6:TC #5 24:SOIL M #7 7:TC #6 25:SOIL M #8 8 TC 7 26:SOIL M #9 9:TC #8 27:SOIL M#10 10:TC #9 28:SOIL M#11 11:TC #10 29:SOIL M#12 12:TC #1 30:SOIL M#13 13:TC #1 31:SOIL M#14...
-
Page 41: General Measurement Considerations
’s ground lug should be connected t earth ground via an 8 AWG wire. This connection should be as short as possible. The AM16/32A also connects to earth ground via the datalogg er. The lead wire that connects the datalogger power ground to the AM16/ 32A power ground (“GND”) establishes this connection. -
Page 42: Mounting Tabs
AM16/32A Relay Analog Multiplexer plate with 1-inch hole grid suitable for mounting the AM16/32A. The enclo sures have a cable bushing to accommodate the sensor lines. These standard enclosures are rain-tight, but not water-proof. The enclosure lids are gasketed. The screws on the outside of the enclosure should be tightened to form a restrictive seal. - Page 43 Appendix A. AM16/32A Improvements The AM16/32A replaced the AM16/32 in October 2006. The AM16/32A’s improvements over the AM16/32 are better ESD and surge protection, a main ground lug, and a newer processor. The AM16/32A is wired and programmed the same as its predecessor, the AM16/32.
- Page 44 This is a blank page.
- Page 45 This is a blank page.
- Page 46 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 cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)