Related Manuals for Campbell AM16/32
Summary of Contents for Campbell AM16/32
- Page 1 AM16/32 Relay Multiplexer Revision: 9/04 C o p y r i g h t ( c ) 1 9 8 7 - 2 0 0 4 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
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. 1. Function...............1 1.1 Typical Applications.................1 1.2 Compatibility ....................2 2. Physical Description...........2 3. AM16/32 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. AM16/32 Improvements over AM416 and AM32 ... A-1 Figures 1. AM16/32 Relay Multiplexer ..............3 2. AM16/32 Relay Actuation Time vs. Temperature and Battery Voltage ..5 3. AM16/32 to Datalogger Power/Control Hookup ........6 4. Power and Ground Connections for External Power Supply ..... 8 5.
- Page 5 Cautionary Notes The AM16/32 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
A slide switch located on the AM16/32’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
2. Physical Description The AM16/32 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 AM16/32’s terminal strips. An aluminum cover plate is also included to this end. -
Page 9: Am16/32 Specifications
11 mA typical in “4 x 16” mode Reset * : A continuous signal between 3.5 VDC and 16 VDC holds the AM16/32 in an active state (where a clock pulse can trigger a channel advance). A signal voltage < 0.9VDC deactivates the AM16/32 (clock pulse will not trigger a scan advance;... - Page 10 AM16/32 Relay Analog Multiplexer Length – 23.9 cm (9.4") Dimensions: Width - 10.2 cm (4.0") Depth - 4.6 cm (1.8") Weight: 1.5 lbs. (approx.), 693 g. With AM ENC enclosure: 10.0 lbs., 4.54 kg (approx.) Mounting Tab 1 inch x 3 inches x 9 inches. Up to 1/8 inch or 3 mm Hole Spacing: diameter screws (see Figure 21).
-
Page 11: Operation
4.1. The Control Terminals The CR5000, CR1000, CR23X, CR10(X), 21X, and CR7 dataloggers connect to the AM16/32 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
4.1.1 Reset The reset (“RES”) line is used to activate the AM16/32. A signal in the range of +3.5 to +16VDC applied to the reset terminal activates the multiplexer. When this line drops lower than +0.9VDC, the multiplexer enters a quiescent, low-current-drain state. -
Page 13: Ground
AM16/32 “GND” terminal is also connected to the MUXPOWER cable (or equivalent) SHIELD and, via that, to datalogger power ground (see Figure 3). If a separate power supply is used, the AM16/32 ground should also connect to the separate supply’s ground (Figure 4). An AM16/32 “COM ”... -
Page 14: Measurement Terminals
For example, if a CR10X makes differential measurements on 32 thermocouples every minute, the average current drain due to the AM16/32 would be about ((.030 Sec/chan x 32 chan)/60 Sec) x 6 mA = 0.1 mA. Under the same conditions, a 2 second execution interval rate increases the average system current drain to about ((.030 Sec/chan x 32... -
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 AM16/32 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 AM16/32 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
10ms delay with 5000 mV of excitation. A control port can be used to clock the AM16/32 if an excitation port is not available. The 21X and CR7 instruction sequence required to clock with a control port is: Instruction 20 (set port high), Instruction 22 (delay 20 ms without excitation), followed by Instruction 20 (set port low). - Page 18 AM16/32 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 AM16/32 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
AM16/32 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
AM16/32 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
AM16/32 (Steps 1 and 9). The instruction sequence for control of an AM16/32 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 AM16/32 Relay Analog Multiplexer *1 Table 1 Programs 1: 60 Sec. Execution Interval ACTIVATES MULTIPLEXER 1: Do (P86) 1: 41 Set high Port 1 BEGINS STRAIN GAGE MEASUREMENT LOOP 2: Beginning of Loop (P87) 1: 0 Delay 2: 10 Loop Count...
-
Page 24: Cr5000 And Cr1000 Programming
AM16/32 Relay Analog Multiplexer DELAY 10: 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 11: Excite,Delay,Volt(SE) (P4) 1: 2 Reps 2: 5... -
Page 25: Cr5000 Programming
5.3.1 CR5000 Programming The following CR5000 example program uses the AM16/32 to measure 16 100 ohm Platinum Resistance Thermometers connected in the 4x16 configuration. The program also measures 6 copper constantan thermocouples. -
Page 26: Cr1000 Programming
AM16/32 Relay Analog Multiplexer 'CR5000 Example Program to measure 16 100 ohm Platinum Resistance Thermometers ‘connected to an AM16/32 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 AM16/32 in (4x16) mode PortSet (4,1) ‘Set Mux Reset line High ‘...
-
Page 28: General Programming Considerations
”). 6.1 Single-Ended Analog Measurement without Sensor Excitation Sensor to AM16/32 wiring - one single-ended sensor not requiring excitation can be connected to an input SET with panel mode switch set to “2X32”. Multiplexer to Datalogger wiring - The COM signal line is input to a single-ended analog input channel. -
Page 29: Differential Analog Measurement Without Sensor Excitation
AM16/32 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/ CR10(X) CR1000/CR5000 CR10(X) CR23X/CR5000 "2 X 32" Mode COM ODD H... -
Page 30: Half Bridge Measurements
AM16/32 Relay Analog Multiplexer 6.3 Half Bridge Measurements Measurements of this 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 panel (example: a CSI 107 probe modified for multiplexer use), then three probes per SET may be excited and measured in “4X16”... -
Page 31: Potentiometer Measurement
AM16/32 Relay Analog Multiplexer CR23X/ CR1000/ "4 X 16" Mode CR23X/ CR10(X) CR5000 CR10(X) CR5000 E/VX 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
AM16/32 Relay Analog Multiplexer CR23X/ CR1000/ "4 X 16" Mode CR23X/ CR10(X) CR5000 CR10(X) CR5000 E/VX COM H (ODD) ODD H COM L ODD L COM H (EVEN) EVEN H COM L EVEN L SHIELD SENSOR SHIELDS FIGURE 14. Four Wire Half Bridge Hook-up and Measurement The CR5000 also has current excitation channels which allow a resistance measurement. -
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 AM16/32, but bypass the AM16/32 with excitation and ground wires. This means that the... -
Page 34: Thermocouple Measurement
When the reference junction is located at the datalogger, the signal wires between the data-logger and the AM16/32 must be of the same wire type as the thermocouple (Figure 17). The "polarity" of the thermocouple wires must be maintained on each side of the multiplexer (e.g. -
Page 35: Differential Thermocouple Measurement With Reference Junction At The Datalogger
FIGURE 18. Differential Thermocouple Measurement with Reference Junction at the AM16/32. If a mix of TCs and other sensor types are multiplexed through the AM16/32, it is generally best to locate the reference junction on the AM16/32, 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 AM16/32 is housed in a field enclosure, the enclosure should be shielded from solar radiation. -
Page 37: Differential Thermocouple Measurement
Multiplexer to Datalogger wiring - The wire types here can be handled in one of two ways. If a reference junction (107 thermistor, or RTD, etc.) is at the AM16/32, then two pairs of copper wires may be run between the COM terminals of the multiplexer and two differential input channels. -
Page 38: Thermocouple And Soil Block Measurement
AM16/32 Relay Analog Multiplexer 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 EVEN L EVEN L MUXSIGNAL SHIELD FIGURE 20. Thermocouple and Soil Block Measurement... - Page 39 AM16/32 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: General Measurement Considerations
Please consult the theory of operation section of your datalogger manual for more information. Earth Ground – An AM16/32 connection to earth ground is made via the datalogger. The lead wire that connects the datalogger power ground to the AM16/32 power ground (“GND”) establishes this connection. -
Page 41: Mounting Tabs
These enclosures contain a mounting plate with 1-inch hole grid suitable for mounting the AM16/32. The enclosures have a cable bushing (AM-ENC has two) to accommodate the sensor lines. - Page 42 AM16/32 Relay Analog Multiplexer This is a blank page.
- Page 43 Appendix A. AM16/32 Improvements The AM16/32 provides the panel switch option of operating in one of two modes. • “4X16” mode - Sixteen channels of four simultaneously enabled terminals (SETs). • “2X32” mode - Thirty-two channels of two SETs. The AM16/32 is designed to do a “break before make” meaning that it advances channels with no momentary connection of the present channel’s...
- 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 sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)