DayTronic 3000PLUS Buku Petunjuk - Halaman 6

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stable, excitation of ±5 VDC ± 2.0% @ 70 ma is

provided for external powered sensor, TTL-type sen-

sors, and other transducers that may require it. With an

externally powered transducer, input isolation yields an

operating common-mode range of up to 1500 V (when

using the regulated excitation provided by the 5D40

module, see Table 1, below). Exceptional signal stabili-

ty and accuracy over a remarkably wide range of sen-

sor inputs are achieved through

•

regulated excitation

• chopper-stabilized low-drift amplification

• configurable low-pass active filtering

• "absolute" software-based calibration

• effective signal isolation & ESD protection

Plugging into the rear of the 3000PLUS meter, the 5D40

connects directly to its source frequency sensor via

simple screw-terminal pinout (see Fig. 3). High output

accuracy over a wide temperature range guarantees

repeatable sensor signal integrity. For steady indication

and smooth, dependable control action, the conditioner

provides a true average value of the measured variable,

even in the face of substantial dynamic content.

The 5D40 features

• Powerful user-selectable low-pass active filter-

ing for removal of unwanted high-frequency mea-

surement-signal components and the elimination of

aliasing errors

• High input impedance on all ranges to eliminate

cable resistance as a source of error (allowable

cable length has virtually no practical limits)

• High noise rejection, eliminating errors from com-

mon-mode pickup and ground-loop coupling, with

3000PLUS

5D40 I

WITH

1. I

NTRODUCTION

1500 VAC isolation between input and output termi-

nals and between I/O and power supply / communi-

cations terminals

• High ESD immunity and extensive EMI protec-

tion further assure data integrity in harsh industrial

environments

Internal "ABSOLUTE" CALIBRATION ensures high accu-

racies, without elaborate trial and error procedures.

Thus, to calibrate the 3000PLUS meter's installed 5D40

module, you need only use the front-panel menu or

configuration software to specify the desired relation-

ship between the measured engineering units and the

±5-VDC output, given the full-scale frequency range for

which it is currently set. If the received input is to repre-

sent a value of some parameter other than frequency

itself, you will also have to enter frequency source value

and range information (as explained in Sections 3.B and

4.E). A zero offset term may also be entered,

expressed either in engineering units or millivolts.

Conventional TWO-POINT (DEADWEIGHT) CALIBRA-

TION may be applied, if desired, to improve on the

"absolute" calculations, when there are at least two

independently and accurately known calibration points

("ZERO" and "SPAN").

Guaranteed "absolute" calibration accuracies for a

properly configured 5D40's input ranges are given in

Table 1, below. By virtue of the unusually high stability

of the 5D40 instrument, even higher accuracies can be

achieved with additional high-precision two-point cali-

bration.

NSTRUCTION

ANUAL V

. SB.3

3KP40 - 1.2