Campbell-scientific CR9000X Measurement and Control System Uživatelský manuál stáhnout pdf (Strana 230)

Section 7. Measurement Instructions

7-6

Parameter

Enter

TCDIFF 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 of the Reps.

Reps

Constant

The number of repetitions for the measurement.

Range* The voltage range for the measurement. TCDiff raw output is Celsius.

Constant ± 5 Volt Analog Input

Module

± 50 Volt Analog Input

Module

CR9058E* Isolation Module

Alpha

Code

Num

Code

R *

Option

Code

Voltage

Range

(±mV)

Alpha

Code

Num

Code

R *

Option

Code

Voltage

Range

Alpha

Code

Num

Code

R * Option

Code

Voltage Range

mV5000

0 100 5000 V50 6 N/A 50 V V60 24 N/A ± 60 V

mV1000

1 101 1000 V10 7 N/A 10 V V20 25 N/A ± 20 V

mV200

4 104 200 V2 10 N/A 2 V V2 10 N/A ± 2 V

mV50

5 105 50 mV500 11 N/A 500 mV V2C 22 N/A ± 2 V

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 3.1.2.2 Differential Voltage Range for details.

ASlot

Constant

The number of the slot that holds the Analog Input Module to be used for the measurement.

DiffChan

Constant

The differential channel number on which to make the first measurement. When Reps are used, subsequent

measurements will be automatically made on the sequential differential channels. Enter a negative number to

dwell on that channel for the number of measurements specified by the Reps parameter (except for CR9058E).

TCType The code for the thermocouple type.

Constant Alpha Code Numeric Code Thermocouple Type

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

TypeN

7 Nicrosil-Nisil (NiCRSi-NiSiMg)

TRef

Variable

The name of the variable that is the reference temperature for the thermocouple measurements.

RevDiff

Constant

Option to reverse inputs to cancel offsets. The sign corrected average of these measurements is used in

the result. This technique cancels voltage offsets in the measurement circuitry but requires twice as

much time to complete the measurement. (CR9058E: All channels on a module must have same setting.)

Value

Inputs are not reversed.

A second measurement is made after reversing the inputs

SettlingTime

Constant

The time in microseconds to delay between setting up a measurement (switching to the channel, setting

the excitation) and making the measurement (10 microsecond resolution).

See

Section 3.1.3 Signal Settling Time. Enter 0 when using the CR9058E (Settling Time not used).

Entry

Voltage

Range

Delay

CR9055 Voltage

Range

Delay

± 50 mV 20 µS (default) ± 0.5V 40 µS (default)

± 200 mV 20 µS (default) ± 2 V 40 µS (default)

± 1000 mV 10 µS (default) ± 10 V 30 µS (default)

± 5000 mV 10 µS (default) ± 50 V 30 µS (default)

> 0

all Truncate to closest 10µS all Truncate to closest 10 µS

Integ

Constant

The integration time in microseconds for each of the channels measured (10 microseconds resolution).

CR9058E*:100 microsecond resolution. All channels on a CR9058 module must have same integration.

Mult, Offset

Constant, Var,

Array, or

Expression

A multiplier and offset by which to scale the raw results of the measurement. The raw output for the

TCDiff instruction is in degrees C. A multiplier of 1.8 and an offset of 32 will convert the temperature

to degrees F.

1 2 ... 225 226 227 228 229 230 231 232 233 234 235 ... 441 442

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