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Campbell AM16/32, Инструкция по эксплуатации

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AM16/32 Relay Analog Multiplexer

7

With the 21X and CR7 dataloggers, switched excitation is generally used to
clock the multiplexer (Instruction 22 configured for 5000 mV excitation).  If no
switched excitation channel is available, it is possible to clock using control
ports.  See Section 5.1 for details.

In the case of the CR5000, CR1000, CR23X, and CR10(X), a control port is
generally used to clock the multiplexer.  Instruction 86 with the pulse port
option (command code 71 through 78) generates a 10 ms pulse which works
well.

The CR5000 and CR1000 uses a port from C1 to C8 controlled by PortSet,
Delay, and SubScan/NextSubScan to create the Clock pulses (see program
example in Section 5.3).

If several multiplexers are required, a CR5000, CR1000, CR10(X) or CR23X
control port (C1 to C8) can source sufficient current to drive up to six
AM16/32 CLK or RES inputs wired in parallel.

4.1.3  Ground

The AM16/32 “GND” terminal is connected to datalogger power ground.  The
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

” terminal

should connect to a datalogger ground terminal (“

” or “G”) via the

MUXSIGNAL cable (or equivalent) also according to Figure 5 (see 4.2.1).
The datalogger itself must connect to earth ground by one of the methods
described in the Installation and Maintenance Section of your datalogger
operator’s manual.

4.1.4  Power Supply

The AM16/32 requires a continuous 12 VDC power supply for operation.  The
multiplexer's current drain is less than 210 microamps in the quiescent state and
is typically 6 to 11 milliamps at 12 VDC when active (see current drain spec).
The power supply is connected to the multiplexer terminals labeled “12V” (+)
and “GND”. Connect the “GND” wire first for safety.

In many applications it is convenient to power the AM16/32 from a datalogger
battery.  For more power-intensive applications, an external, rechargeable, 12
VDC, 60 Amp Hr source may be advisable. Lead-acid supplies are
recommended where solar or AC charging sources are available because they
handle well being “topped off” by constant charging.  The BPALK alkaline
supply (12 Amp Hr) can be used to power the AM16/32 in applications where
the average system current is low, or where it is convenient to frequently
replace batteries. It is advisable to calculate the total power requirements of a
system and the expected longevity of the power supply based on average
system current drains (e.g. logger, multiplexer, other peripherals and sensors) at
the expected ambient temperatures.

Содержание AM16/32

Страница 1: ...INSTRUCTION MANUAL 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 I n c...

Страница 2: ...ther warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential...

Страница 3: ...Datalogger Programming 10 5 1 Single Loop Instruction Sequence 11 5 2 Multiple Loop Instruction Sequence 16 5 3 CR5000 and CR1000 Programming 18 5 3 1 CR5000 Programming 19 5 3 2 CR1000 Programming 2...

Страница 4: ...Hookup 4x16 Mode 9 6 SCWIN Short Cut for Windows Program Builder 10 7 Example 4X16 Mode Program Loops for CR23X CR10 X 21X and CR7 Dataloggers 14 8 Example 2X32 Mode Program Loops for CR23X CR10 X 21X...

Страница 5: ...easurement Customers who need to switch power are directed to Campbell Scientific s SDM CD16AC A6REL 12 or A21REL 12 relays Changing the setting of the mode switch from 4X16 to 2X32 connects COM ODD H...

Страница 6: ...This is a blank page...

Страница 7: ...depends primarily on the type s of sensors to be scanned The following guidelines assume identical sensors Up to 32 single ended or differential analog sensors that do not require excitation For exam...

Страница 8: ...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...

Страница 9: ...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 t...

Страница 10: ...oy Wiper to N O contact capacitance 0 5 pF Typical low current 30 mA life 5 x 10 7 operations Relay Switching Thermal emf 0 3 uV typical 0 5 uV maximum Characteristics applying 11 3 14 VDC Operate tim...

Страница 11: ...sses the use of sensor measurement terminals 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 con...

Страница 12: ...the case of the 21X or CR7 with older PROMS Instruction 20 is commonly used The CR5000 and CR1000 uses the PortSet instruction to control the reset line 4 1 2 Clock Pulsing the AM16 32 CLK line high R...

Страница 13: ...hould connect to a datalogger ground terminal or G via the MUXSIGNAL cable or equivalent also according to Figure 5 see 4 2 1 The datalogger itself must connect to earth ground by one of the methods d...

Страница 14: ...strip when the 12V supply is used to power peripherals This limitation reduces the number of available analog input channels and may mandate the use of an external supply for the AM16 32 Figure 4 FIGU...

Страница 15: ...6 groups panel switch set to 4X16 or into 32 groups panel switch set to 2X32 The groups consists of four or two Simultaneously Enabled Terminals SETs With panel switch set to 4X16 mode the blue channe...

Страница 16: ...connects to COM EVEN H and COM ODD L connects to COM EVEN L when panel switch is in 2X32 mode 5 Datalogger Programming A good way for the beginner or veteran datalogger programmer to create an AM16 3...

Страница 17: ...rogram exits the loop 3 Clock and Delay With the CR23X and CR10 X the clock line is connected to a control port Instruction 86 with the pulse port command 71 78 pulses the clock line high for 10 ms In...

Страница 18: ...nstructions is indexed For example 2 sensors per SET one rep in each of two measurement instructions two measurement values assigned to indexed input locations one begins with input location 1 the oth...

Страница 19: ...ons 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 unit...

Страница 20: ...Port No BEGIN MEASUREMENT LOOP 02 P87 Beginning of Loop 01 0 Delay 02 16 Loop Count CLOCK PULSE AND DELAY 03 P22 Excitation with Delay 01 1 EX Card 02 2 EX Chan 03 1 Delay w EX units 01 sec 04 1 Delay...

Страница 21: ...BEGIN MEASUREMENT LOOP 02 P87 Beginning of Loop 01 0 Delay 02 32 Loop Count CLOCK PULSE DELAY 03 P22 Excitation with delay 01 1 EX Chan 02 2 EX Chan 03 1 Delay w EX units 01 sec 04 1 Delay after EX u...

Страница 22: ...ctivate and deactivate the 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...

Страница 23: ...2 1 1 EX Chan 2 0 Delay w EX units 01sec 3 1 Delay after EX units 01sec 4 0 mV Excitation FULL BRIDGE MEASUREMENT INSTRUCTION 5 Full Bridge P6 1 1 Rep 2 3 50 mV slow Range 3 1 IN Chan 4 1 Excite all r...

Страница 24: ...7 STRAIN 7 19 POT 9 8 STRAIN 8 20 POT 10 9 STRAIN 9 21 POT 11 10 STRAIN 1022 POT 12 11 POT 1 23 _________ 12 POT 2 24 _________ 5 3 CR5000 and CR1000 Programming The CR5000 and CR1000 are programmed...

Страница 25: ...ion Current excitation allows a resistance measurement on a four wire sensor e g a PRT such as shown in Figure 14 using only a single differential channel and no fixed resistor the excitation return g...

Страница 26: ...ff TCTemp 6 mV20C 1 TypeT TRef True 0 250 1 0 0 Portset 1 1 Set C1 high to Enable Multiplexer I 0 SubScan 0 sec 16 Pulse C2 Set High Delay Set Low to clock multiplexer Portset 2 1 Delay 0 20 mSec Port...

Страница 27: ...VWC 48 Public Flag 1 Dim I Declare Constants CS616 Default Calibration Constants const a0 0 0663 const a1 0 0063 const a2 0 0007 Flag logic constants const high true const low false Define Data Tables...

Страница 28: ...ction covers sensor to AM16 32 connections as well as AM16 32 to datalogger connections The following are examples only and should not be construed as the only way to make a particular measurement See...

Страница 29: ...og Measurement without Sensor Excitation Sensor to Multiplexer wiring Up to two differential sensors that don t require excitation may be connected to one input SET with panel switch set to 4X16 mode...

Страница 30: ...our wire half bridge then only one sensor per SET of four may be measured Figure 14 6 3 1 Half Bridge Measurement with Completion Resistor at Datalogger Sensor to Multiplexer wiring up to three half b...

Страница 31: ...erminal is connected to a datalogger switched excitation channel and the remaining COM line connects to datalogger ground Up to 32 potentiometers may be measured by two single ended datalogger channel...

Страница 32: ...4 See Section 5 3 for an example 21x CR7 CR10 X 4 X 16 Mode E E AG G E VX COM H ODD COM L COM H EVEN COM L ODD H ODD L EVEN H EVEN L SHIELD SENSOR SHIELDS COM H H H L L L CR23X CR5000 FIGURE 15 Full B...

Страница 33: ...rom the datalogger s excitation channel Alternatively the excitation and ground leads can be multiplexed through an additional AM16 32 allowing the sensors to be excited one at a time Figure 16 In thi...

Страница 34: ...he multiplexer e g if constantan wire is input to an L terminal then a constantan wire should run between the multiplexer s COM ODD L terminal and the datalogger measurement terminal Figures 17 and 18...

Страница 35: ...lexed through the AM16 32 it is generally best to locate the reference junction on the AM16 32 as shown in Figure 18 AM16 32 Reference An external reference usually a thermistor can be located at the...

Страница 36: ...t In single ended thermocouple measurements the following precautions must be taken to ensure accurate measurement Only shielded thermocouple wire should be used the sensor shields should be tied to m...

Страница 37: ...32 then two pairs of copper wires may be run between the COM terminals of the multiplexer and two differential input channels If the reference junction is at the datalogger then two pairs of thermocou...

Страница 38: ...uple and Soil Block Measurement EXAMPLE PROGRAM THERMOCOUPLE AND SOIL BLOCK MEASUREMENT PROGRAM IS FOR CR10 X 33 LOCATIONS ALLOCATED TO INPUT STORAGE 1 Table 1 Programs 1 60 Sec Execution Interval REF...

Страница 39: ...TC 1 7 1 Mult 8 0 Offset MEASURES 1 SOIL MOISTURE BLOCK PER LOOP 7 AC Half Bridge P5 1 1 Rep 2 14 250 mV fast Range 3 3 IN Chan 4 2 Excite all reps w EXchan 2 5 250 mV Excitation 6 18 Loc SOIL M 1 7 1...

Страница 40: ...ual 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 establish...

Страница 41: ...vironments user supplied foam putty or similar material helps to reduce the passage of moisture into the enclosure via cable conduits 8 1 Mounting Tabs The AM16 32 has mounting tabs allowing attachmen...

Страница 42: ...AM16 32 Relay Analog Multiplexer 36 This is a blank page...

Страница 43: ...re make meaning that it advances channels with no momentary connection of the present channel s sensor inputs with the next channel s sensor inputs The AM16 32 is smaller than the AM416 and AM32 allow...

Страница 44: ...This is a blank page...

Страница 45: ...This is a blank page...

Страница 46: ...campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientifi...

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