Daytronic 10A40 Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

This single-channel conditioner is for measurement of flow, rpm, and other phenome-

na that can be sensed by pulse transformer transducers with two-wire isolated wind-

ings (tachometer pickups, turbine flowmeters, etc.), transistor or logic-circuit drivers,

“zero-velocity” (true digital output) sensors, and similar

frequency-generating trans-

ducers

.

The 10A40 accepts a wide range of wave shapes and voltage levels, either grounded

or floating—though it is not recommended for measuring frequencies under 25 Hz

without special modification. The “Smart Schmitt” input threshold automatically

adjusts to accommodate signals from 10 mV to 200 V. Nominal ±5 V-DC excitation is

supplied for use with a “zero-velocity” sensor.

Capacitive coupling of 0.1 or 10 µF is provided for low-frequency inputs, to eliminate

false triggering by signal noise and/or any positive or negative DC offset that exists for

the frequency signal. A special trigger-level control guarantees reliable triggering

when the input is at the low end of the voltage range.

The System 10 Central Processor controls frequency-range selection and applies an

appropriately calculated scaling factor to each measurement, if desired, following initial

entry of a special

FREQUENCY CALIBRATION (FRQ) command (see Section 3.a,

below). This convenient “calculated” calibration technique can be used when the manu-

facturer-supplied full-scale rating of the frequency source (or the highest frequency

expected to be measured) is known. A precise 2.097152-MHz crystal frequency refer-

ence ensures accuracy of all calibrations, whether “absolute,” “calculated” (via the

FRQ

command), or “two-point” (“dead-weight”).

ADDITIONAL10A40 SPECIFICATIONS

Input:

Type: Any AC or unipolar pulse signal, grounded or floating, irrespective of waveform

Threshold Level: Accommodates signals from 100 mV to 200 V

Frequency Ranges: From 10% to 100% of 250, 500, 1000, 2000, 4000, 8000, 16000, or

32000 Hz; automatically selected—on an individual channel basis—when the channel is

configured;

for the System 10 channel “type” code assigned to a 10A40 data chan-

nel, see Table 1, below

Excitation: Nominal 10 (i.e., ±5) V-DC; ±50 mA, maximum

Measurement Characteristics (per channel):

Normal-Mode Range

: ±200 V operating and without instrument damage

Common-Mode Range: ±50 V operating; ±100 V, without instrument damage

Common-Mode Rejection Ratio: At 60 Hz: -120 dB; at 1 kHz: -60 dB

Input Impedance: Differential: 400 kΩ; Common-Mode: 100 kΩ

(cont’d)

GENERALDESCRIPTIONANDSPECIFICATIONS10A40.1

SYSTEM10

ANALOGINPUTCARDS

1.E.2.10A40

MODEL10A40

FREQUENCYINPUT

CONDITIONERCARD

Product specificaties