DMS-30PC-1-RH-C【PDF 3/6 页】DPM LED MINI 2VDC SUPER-BRIGHT

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DMS-30PC Series

3? Digit, LED Display Low-Power,

Miniature Digital Panel Voltmeters

4. DISPLAY TEST (Pin 2) : Connecting pin 2 to +5V SUPPLY (pin 1) will

activate all LED segments, except the decimal points, and the display

will read "1888" regardless of the actual applied input. If a negative

input is applied, DISPLAY TEST will also activate the minus sign. To

protect the LED's, the display should not be left in the "test" mode for

more than 10 seconds.

5. Decimal Point Placement : The location of the decimal point is

user-selectable, and the decimal point control pins (DP1-DP3) are

active low functions. Select the desired decimal point by tying the

appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal

point location pins should be left open.

Hard wiring is preferable, however, you can use logic gates to

exercise dynamic control over the location of the decimal point if the

following drive conditions are met:

APPLICATIONS

DMS-30PC meters are highly versatile devices that can be used in

hundreds of applications. The application circuits chosen for this sec-

tion have historically received many inquiries. Every attempt has been

made to ensure technical accuracy, and all of the following circuits

have been prototyped and tested to ensure functionality. Please keep

in mind, however, that real-world applications are seldom as straight-

forward as the approaches presented here. Most applications have

many more components — and many more connections — than the

illustrations show.

The simpli?ed schematic shown in Figure 1 can be very useful when

debugging a malfunctioning panel meter circuit, particularly if the

user has some knowledge of operational ampli?ers (op amps). The

meter's high-impedance input consists of an op amp powered from a

±5Vdc power supply (the –5V is internally generated). Knowing this,

Model

DMS-30PC-X-RL

Applied "0" Voltage Load Current*

+0.05V max. 0.7mA max.

one can easily see why input signals applied to (–) INPUT LO and (+)

INPUT HI have to be kept within the power supply rails of ±5V. Also

note that only pin 11 has a current-limiting 909kΩ series resis-

All Others

+0.4V max.

6mA max.

tor. High input voltages that have a common ground with pin 3 (5V

* The driving gates must be able to sink this much current

(I OL ) with a logic "0" output.

6. Gain Adjust : There is a gain-adjust potentiometer on the back of

each meter. It has approximately ±50 counts (±2.5%) of adjustment

range. Since these devices essentially have no zero/offset errors,

a gain adjustment is effectively an overall accuracy adjustment.

Though they may be performed at any point (except zero), accuracy

adjustments are most effective when performed with higher level

input signals. The circuit shown in Figure 10 provides ±10% range of

adjustment.

7. Soldering Methods: All models in the DMS-30PC Series easily

withstand most common wave soldering operations. We recom-

mend, however, that you evaluate the effects your particular soldering

techniques may have on the meter's plastic case and high-precision

electrical performance. We recommend the use of no-clean solders.

8. Suggested Mating Connectors :

Panel mounted:

RETURN) should only be applied to pin 11 ((+) INPUT HI) and never to

pin 12. In these high-voltage cases, pin 12 should always be tied to

pin 3 (5V RETURN).

One of the simpli?ed schematic's noteworthy features is that it

shows internal voltage values. It also shows that pin 3 is the meter's

zero-volt reference point — regardless of the type of power or signal

source used. This is an important point to keep in mind when a digital

or analog multimeter is used to make system measurements. The

multimeter's negative lead (usually the black one) must be connected

to pin 3 (5V RETURN).

1. Single-Ended Input Con?gurations : True single-ended measure-

ments can be made with any DMS-30PC meter. The circuit of Figure

2 avoids problems normally associated with ground-loop currents.

Separate ground runs should be used for 5V RETURN (pin 3) and (–)

INPUT LO (pin 12). This will ensure that large LED currents will not

?ow in the wiring that connects V IN to (–) INPUT LO (pin 12). Ground-

loop currents can cause unstable readings.

Connector housing

Terminal type

Crimping tool

Wire size

Insulation diameter

Stripping length

DATEL P/N 4320-01069-0

DATEL P/N 4400-01032-0

DATEL P/N 39-2099000

22 to 26 AWG

0.062" (1.57mm) maximum

0.100 to 0.125" (2.54 to 3.17mm)

+

–

V IN

11

(+) IN HI

12

(–) IN LO

DMS-30PC-1

8

REF OUT

7

REF IN

1

6

3

Board mounted:

Socket

DATEL P/N 4320-01074-0

+5V SUP

DP1

5V RET

85-264Vac

AC to DC Converter

Figure 2. Single-Ended Input Con?guration

www.murata-ps.com/dpm

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MPM_DMS_30PC.F05 Page 3 of 6

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DMS-30PC-1-RL 功能描述:数字面板表 3.5 Digit +-2V Input Low Power Red RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

DMS-30PC-1-RL-C 功能描述:数字面板表 3.5 Digit +-2V Input Low Power Red RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

DMS-30PC-1-RS 功能描述:数字面板表 3.5 Digit +-2V Input Std Red RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

DMS-30PC-1-RS-C 功能描述:数字面板表 3.5 Digit +-2V Input Std Red RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

DMS30PC-1-RS-C 制造商:Murata Power Solutions 功能描述:Std red LED digital voltmeter,2V 14mm

DMS-30PC-1-VFS 功能描述:数字面板表 3.5 Digit +-2V Input Blue-Green RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

DMS-30PC-1-VFS-C 功能描述:数字面板表 3.5 Digit +-2V Input Blue-Green RoHS:否制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM

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