945 PDF资料下载(6/6 页)Converter

参数资料

Models 940 and 945 DC Transmitters

http://www.calex.com

2401 Stanwell Drive

Concord, CA 94520-4841

(510) 687-4411 Fax (510) 687-3333

MK940 Application

Isolated Voltage In - 1 to 5 Volts Out

MK940 Application

Isolated Voltage In - 4 to 20 Volts Out

with Single Pole 10Hz Input Filter

NOTE:

R13 IS A 1% METAL FILM 1/4 W

RESISTOR.

NOTE:

R13 IS A 1% METAL FILM 1 W

RESISTOR.

FREQUENCY LIMIT - INPUT FILTER

DC TO 10 Hz BAND PASS

FIGURE 7.

Is similar to Figure 6 except R1 and R2 are used to set 4mA, or 1 Volt at the output with zero Volts input. Also R5 is zero ohms.

FIGURE 8.

Shows how to add a low pass filter at the input where the 400Hz bandpass may be too high and is causing noise problems. C4 should be a low dielectric

absorption capacitor such as a X7R ceramic or a film capacitor. As discussed in Figure 6, R13 is the output source resistance and in this case would

produce a 10% error when driving a 10,000 ohm load, and a 0.01% error when loaded by a 10 Megohm input digital voltmeter.

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