Performance/Functional Specifications

Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit,

unless otherwise noted.

➀ Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with

(–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected

(see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage.

➁ See Technical Notes.

Analog Inputs

Min.

Typ.

Max.

Units

Full Scale Input Range:

DMS-30DR-0

–

±200

–

mV

DMS-30DR-1

–

±2

–

Volts

DMS-30DR-2

–

±20

–

Volts

DMS-30DR-3

–

±200

–

Volts

Input Impedance:

–

DMS-30DR-0, -1

100

1000

–

M

Ω

DMS-30DR-2, -3

0.9

1

–

M

Ω

Overvoltage Protection

➀

–

–

±250

Volts

Common Mode Voltage Range

–

–

±2

Volts

CMRR (dc to 60Hz)

–

86

–

dB

Control Inputs

➁

Decimal Point Placement (Pins 4-6)

Tie to pin 3 to activate

Ext. Bright (Pin 2)

See Technical Note 1

Performance

Sampling Rate

2.5 reading per second

Accuracy (3 minute warm-up):

DMS-30PC-0 (Vin = +0.19V)

–

±1

±3

Counts

DMS-30PC-1 (Vin = +1.9V)

–

±1

±3

Counts

DMS-30PC-2 (Vin = +19V)

–

±2

±3

Counts

DMS-30PC-3 (Vin = +190V)

–

±2

±3

Counts

Zero Reading (Vin = 0 Volts)

“–001”

“000”

“001”

Temperature Drift (0 = +60°C)

–

±0.2

±0.4

Cnts/°C

+1.225V Reference Output (Pin 9)

➁ +1.215

+1.225

+1.235

Volts

Power Supply Requirements

Supply Voltage

+4.75

+5.00

+5.25

Volts

Supply Current:

Full Sunlight

–

+150

+250

mA

Total Darkness

–3

5

mA

Display

Display Type and Size

3½ digit, 0.56"/14.2mm high LED

Polarity Indication

Autopolarity ("–" for negative Vin)

Overrange Indication

"–1_ _ _ " for negative inputs

"1_ _ _ " for positive inputs

Physical/Environmental

Operating Temperature

0

–

+60

°C

Storage Temperature

–40

–

+75

°C

Humidity (non-condensing)

0

–

95

%

Case Material

Polycarbonate

Weight

0.75 ounces (21 grams)

Ordering Informatio

n

DMS-30DR- 1 - R - C

LED Color:

R = Red

Accessories:

DMS-EB-C

Multi-purpose (gain/offset, 4-20mA, etc.)

DMS-EB-RMS-C

For true rms measurements of ac voltages

DMS-30-CP

Panel cutout punch

Input Range:

0 = ±200mV

1 = ±2V

2 = ±20V

3 = ±200V

RoHS

www.murata-ps.com/support

DMS-30DR Series

Sunlight Readable, 3½ Digit Panel Meters

with Auto-Dimming LED Displays

MPM_DMS-30DR.C0

3 Page 2 of 6

A panel-mount DMS-BZL2-C is supplied with each unit.

NOTE: See the table on the top of Page 1 for model-specific availability.

TECHNICAL NOTES

1. External Brightness Adjustment (Pin 2): Pin 2 is internally con-

nected to the high impedance input of an operational amplifier that

amplifies the output of the DMS-30DR’s ambient light sensor (ALS)

circuit. The output of this amplifier varies the voltage that drives the

DMS-30DR’s LED display. Leave pin 2 open for standard auto-dim-

ming operation; in this mode, the ALS circuit will automatically adjust

the DMS-30DR’s LED brightness to compensate for changes in ambi-

ent lighting. As the ambient light striking the ALS increases, the LED

display’s brightness will also increase; a decrease in ambient light will

reduce the display’s brightness.

The ALS circuit’s output signal can be overdriven by applying an

externally generated voltage directly to pin 2. External drivers will see

approximately 600Kohms referenced to 5V RETURN. With pin 2 at

+0.7Vdc or below, the DMS-30DR’s LED display is off, and total cur-

rent drain from a nominal +5V supply is approximately 1mA. The LED

display’s brightness will increase from minimum to maximum as the

voltage applied to pin 2 is varied from +0.8V up to +2.5V, respectively.

To enable continuous maximum display brightness, connect pin 2

directly to pin 1 (+5V SUPPLY); in this configuration the total current

drain for the meter will be approximately 200mA.

2. Minimum-Intensity Adjustment Potentiometer: Users can adjust

the DMS-30DR’s minimum LED brightness to suit their requirements

by adjusting the ¾-turn, rear-mounted intensity adjustment poten-

tiometer. Please note, this potentiometer will have minimal impact

on display brightness in high ambient light environments. See the

Mechanical Specifications section for potentiometer locations.

The intensity adjustment potentiometer is factory preset to its

mid-point position, producing a typical current drain of 7mA. At it’s

minimum and maximum positions, current drain is typically 3mA and

13mA, respectively. As viewed from the rear of the meter, with the

model number label facing up, turning the potentiometer clockwise

increases the display’s intensity.

3. +1.225V REFERENCE OUTPUT (Pin 9): This pin is the output of the

meter’s precision +1.225V internal reference IC. Pin 9 is referenced

to ANALOG COMMON (pin 10), which in turn sits approximately +2V

above pin 3. Pin 9 should be buffered if it’s used to drive external

loads since sourcing more than 15µA of current can affect both the