DMS-40LCD-1SLASH2-5-C. datasheet(4/6 Pages) MURATA

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DMS-40LCD Series

4½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS40LCD.D01 Page 4 of 6

APPLICATIONS

2. Differential Input Conﬁgurations: Differential measurements can be

made with either 5V-powered or 9V-powered meters. Figure 3, though

not a practical real-world application, uses a voltage divider to demon-

strate the concept of a differential input signal. Be careful not to exceed

the ±2V common mode voltage limitation for 5V-powered meters.

4. Floating Signal Source Measurements: Floating signals can be

measured using the circuits shown in Figures 5 and 6. Figure 5 uses

a 5V-powered meter. Figure 6 uses a 9V-powered meter. Both ﬁgures

show a DMS-40LCD-0/1 with pin 2 tied to pin 1 yielding a ±2V input

range. Connecting pin 10 (ANALOG COMMON) to (–) INPUT LO (pin

12) provides the reference point for the meter’s input.

A “ﬂoating” input is a signal that has no galvanic connection to the

meter’s power supply. In the ﬁgures below, the 1.5V battery illustrates a

true ﬂoating input.

Figure 5. Floating Input Measurements

(5V-Powered Models)

Figure 6. Floating Input Measurements

(9V-Powered Models)

Figure 3. Differential Input Conﬁguration

(5V-Powered Models)

3. Engineering Scaling: For measuring voltages greater than the full

scale input range of a given meter, the input signal must be attenuated.

A simple voltage divider (similar to that shown in Figure 4) will scale

the input to within the range of the selected meter. R1 and R2 should

be precision, ±1%, metal ﬁlm resistors with absolute TCR’s less than

50ppm/°C. See Ap Note 4 for more information on engineering scaling.

50k

Ω < R1 + R2 < 10MΩ

R1 + R2

x VIN = Reading

Figure 4. Input Attenuation Circuit

–

(+) IN HI

(–) IN LO

5V RET

VIN

DMS-40LCD-0/1-5

+ BAT

–BAT

BATTERY

DP1

RANGE

(–) IN LO

ANA COMM

(+) IN HI

CELL

1.5V

–

DMS-40LCD-0/1-9

+5V SUP

(–) IN LO

5V RET

120 VAC

(+) IN HI

DP1

AC to DC Converter

RANGE

DMS-40LCD-0/1-5

5V RET

+5V SUP

DP1

120 VAC

AC to DC Converter

RANGE

(–) IN LO

ANA COMM

(+) IN HI

CELL

1.5V

–

DMS-40LCD-0/1-5

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