Daytronic 10A41-2C Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

Employing a 1-MHz crystal reference, the two-channel Model 10A41-2C is for mea-

surement of flow, rpm, and other phenomena that can be sensed by pulse trans-

former transducers with two-wire isolated windings (tachometer pickups, turbine

flowmeters, etc.), transistor or logic-circuit drivers, “zero-velocity” (true digital output)

sensors, and similar

frequency-generating transducers.

The 10A41-2C 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” threshold level for each input

channel may be individually selected via internal jumper connections, depending on

the expected peak voltage input. This ensures reliable triggering when the input is at

the low end of the voltage range. All ranges are protected against an overload of up

to 200 V. Nominal ±5 V-DC excitation is supplied for use with a “zero-velocity” sensor.

Capacitive coupling of 0.1 or 22 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.

One of four separate filter bandwidths is available for each input channel: 1.25 Hz;

2.5 Hz; 5 Hz; or 12.8 Hz. Per-channel bandwidth is selectable via internal jumpers.

Each channel is normally preset for the 1.25-Hz bandwidth, which, while yielding the

slowest response, also provides the

widest dynamic range for high-frequency inputs

(2% to 100% of full scale for the 1-kHz and 2-kHz ranges; 1% to 100% of full scale for

ranges above 2 kHz). For faster response, you may select one of the higher filter

bandwidths (see Table 1, below).

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.c,

below). This convenient “calculated” calibration technique can be used for a 10A41-2C

data channel when the manufacturer-supplied full-scale rating of the frequency source

(or the highest frequency expected to be measured) is known. The 1-MHz crystal fre-

quency reference ensures accuracy of all calibrations, whether “absolute,” “calculated”

(via the

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

ADDITIONAL10A41-2C 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

(cont’d)

MODEL10A41-2C

DUALFREQUENCYINPUT

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONS10A41-2C.1

SYSTEM10

ANALOGINPUTCARDS

1.E.2.10A41-2C

Product specificaties