Fluke NetDAQ 2640A Manual de usuario descargar pdf (Pagina 23)

Overview

Instrument Features and Capabilities

1-7

Analog Channels 1-3.

The analog channel (1 to 20) measurement connections are made via the

Universal Input Module. External signal conditioning for the analog inputs is not

necessary. The host computer configures all analog channels using NetDAQ

Logger.

Computed Channels 1-4.

In addition to the 20 analog channels, the instrument provides an additional 10

computed channels (21 to 30) by processing analog channels and other computed

channels. The following methods are used:

• The average of a group of channels,

• The difference between any two channels,

• The difference between a channel and the average of a group of channels,

• A mathematical equation.

Channel Numbering 1-5.

Each instrument channel, measured or computed, is identified by Global Channel

Number (GCN). The first two digits of the GCN are the Base Channel Number

(01 to 99) that identifies the instrument. The last two digits are the channel

number. For example, GCN 2618 indicates instrument 26 and analog channel 18

(below). When the instrument is in the quiescent state, the channel number of the

GCN shows dashes, for example, 45-- for instrument 45.

Mx+B

ALARM

SCAN

MON

Mx+B Scaling 1-6.

Mx+B scaling multiplies a measurement by a multiplier M and then offsets it by

an offset B. For example, Mx+B scaling of 100x+50 applied to a measured or

computed channel value of 1.15 results in a reading of 100(1.15)+50=165. A

common use of Mx+B scaling is to calibrate a sensor or transducer to provide for

display and recording in engineering units. The Mx+B annunciator lights when a

monitored channel has scaling applied.

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Fluke NetDAQ 2640A Manual de usuario Pagina 23