Campbell-scientific CR9000X Measurement and Control System Manual de usuario descargar pdf (Pagina 240)

Section 7. Measurement Instructions

7-16

Each element in the array corresponds to a line number in the program. To

accommodate all of the instructions in the program, the array must be

dimensioned to a number greater than or equal to the total number of lines in

the program, including blank lines and comments. The Dest array must also be

dimensioned as a long integer (e.g., Public Array(20) AS LONG).

The execution time for an instruction may vary. For instance, it

may take longer to execute instructions when the datalogger is

communicating with another device.

7.5 Peripheral Devices

AM25T (Dest, Reps, Range, AM25TChan, ASlot, DiffChan, TCType, Tref,

ExCardSlot, ClkPort, ResPort, ExChan, RevDiff, SettlingTime, Integ,

Mult, Offset)

This Instruction controls the AM25T Multiplexer.

Parameter

Enter

AM25T PARAMETERS

Dest

Var. or Array

The Variable in which to store the results of the instruction. When Reps are used the results are stored in

an array with the variable name. An array must be dimensioned to have elements for all the Reps.

Reps

Constant

The number of repetitions for the measurement. For analog measurements, entering reps as a negative

number forces all reps to be on the same channel except for with CR9058E module.

Note: Enter 0 to only measure the output from the PRT.

Range The voltage range for the measurement. V ranges output volts, mV ranges output millivolts.

Constant ± 5 Volt Analog Input

Module

± 50 Volt Analog Input

Module

Alpha

Code

Num

Code

R *

Option

Code

Voltage

Range

(±mV)

Alpha

Code

Num

Code

R *

Option

Code

Voltage

Range

mV5000

0 100 5000 V50 6 N/A 50 V

mV1000

1 101 1000 V10 7 N/A 10 V

mV200

4 104 200 V2 10 N/A 2 V

mV50

5 105 50 mV500 11 N/A 500 mV

mV200C

16 116 200 Alpha Codes ending with a C signify that the channel will be pulled into

See Section

3.2.2 for more

info on the C

& R range

code options.

mV50C

17 117 50 Operational Input Voltage Limits & checked for open input. See Section 3.1.2.

AM25TChan

Constant

The input channel on the AM25T for the first measurement

ASlot

Constant

The number of the slot that contains the CR9050 Module used to measure the AM25T reference

temperature and connected sensors.

DiffChan

Constant

The channel number on the CR9050 Module that will be used to make the actual measurements from the

AM25T.

TCType The code for the thermocouple type.

Constant Alpha Code Numeric Code Thermocouple Type

-1 Output mV

TypeT

0 Copper Constantan

TypeE

1 Chromel Constantan

TypeK

2 Chromel Alumel

TypeJ

3 Iron Constantan

TypeB

4 Platinum Rhodium

TypeR

5 Platinum Rhodium

TypeS

6 Platinum Rhodium

NOTE

1 2 ... 235 236 237 238 239 240 241 242 243 244 245 ... 441 442

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