31040ESD - Chemtronics - Datasheet.Live

LCD, POSITIVE REFLECTIVE OR NEGATIVE TRANSMISSIVE

WITH YELLOW/GREEN OR RED BACKLIGHTING

1 pA INPUT LEAKAGE CURRENT TYPICAL

200 mV FULL SCALE

AUTOMATIC ZEROING CIRCUIT

SELECTABLE DECIMAL POINTS

POLARITY INDICATION

5 VDC POWERED

FIVE SELECTABLE DISPLAY ANNUNCIATORS

PANEL MOUNT OR PC BOARD MOUNT

DESCRIPTION

The MDMV is a small panel or printed circuit board mount digital voltmeter.

With advantages of accuracy, size, and ease of installation, it is an ideal

replacement for analog meters. The unit has a 3½-digit LCD display with 0.4"

(10.2 mm) high digits. The displays are available in positive image reflective

(black digits, reflective background) or negative image transmissive (illuminated

digits, dark background) with red or yellow/green backlighting.

The integrated circuit is bonded directly to the printed circuit board and is

mechanically protected. Internal electrical interface connections use elastomeric

connectors to provide a corrosion resistant connection. This reliable construction

also reduces the space requirements.

The MDMV module is designed to operate from a +5 VDC supply. The

module measures input voltages from 0 to ±199.9 mV DC relative to the supply

common.

Auto-zeroing is provided by the module, therefore no zero adjustment is

required. If the input signal exceeds the input range, the unit display will

indicate an overrange condition.

The module has three selectable decimal point positions and five selectable

annunciators (BAT,V,A,m,μ). The BAT (Battery) annunciator is used to indicate

a low battery condition, while the others are used to indicate Volts and Amperes.

SPECIFICATIONS

1. DISPLAY: 3½-digit, 0.4" (10.2 mm) high digits. A minus(-) sign is displayed

when the voltage is negative.

2. DECIMAL POINTS: Selectable decimal points are activated at the rear

terminal pins to allow the display to be read in tenths, hundredths or

thousandths.

3. ANNUNCIATORS: 5 selectable annunciators, BAT, V, A, μ and m are

activated at the appropriate rear terminal.

4. POWER REQUIREMENTS:

Reflective Versions: 3 VDC to 6 VDC @ 500 μA Max.

Backlight Versions: 4.8 VDC to 6 VDC @ 25 mA Max.

5. INPUT RANGE: 0 to ±199.9 mV DC.

6. COMMON MODE: ±1 V min. around common.

7. ACCURACY: ±(0.1% + 1 digit).

8. RESOLUTION: 100 μv/Count.

9. OVERRANGE RATINGS, PROTECTION & INDICATION:

Max Input Voltage: 6 VDC Max.

Overrange Indication: Overrange is indicated by a “1” displayed in the

most significant digit and the blanking of the three least significant digits.

10. READING RATE: 2½ readings per second.

11. RESPONSE TIME: 1.5 seconds to settle for a step input change.

12. INPUT LEAKAGE CURRENT: 1 pA typical, 10 pA Max.

MODEL MDMV - MINIATURE DISPLAY MODULE D.C. VOLTMETER

1.81 (46.0)

SEE

NOTE

.06

(1.5)

1.06

(26.9)

.2 (5.08) MAX.

.14 (3.56) MIN.

1.68 -.02

+.03

.93 -.02

+.03

(23.6 +.8

-.5

(42.7 +.8

-.5

)

(1.5)

R .06 MAX., 4PL.

NOTE: BACKLIGHT MODELS: 0.50" (12.7)

REFLECTIVE MODELS: 0.31" (8.0)

DIMENSIONS

In inches (mm)

Note: Recommended minimum clearance (behind the panel) for mounting clip installation is 2.25" (57.2)W x 1.5" (38.1)H.

PANEL MOUNT UNIT PANEL CUT-OUT

1.65 (41.9)

.90

(22.9)

SEE

NOTE

REFLECTIVE MODELS: 0.37" (9.4)

NOTE: BACKLIGHT MODELS: 0.56" (14.2)

Ø.042 (1.07) THRU, 15 PL.

UNIT OUTLINE

.10 (2.5)

.12 (3.1)

.19 (4.8)

.14 (3.56) MIN.

.2 (5.08) MAX.

PRINTED CIRCUIT BOARD MOUNT UNIT RECOMMENDED PCB LAYOUT

Bulletin No. MDMV-F

Drawing No. LP0266

Revised 08/09

Tel +1 (717) 767-6511

Fax +1 (717) 764-0839

www.redlion.net

SPECIFICATIONS (Cont’d)

13. COMMON MODE REJECTION RATIO: 70 dB.

14. INPUT IMPEDANCE: 1000 M

15. TEMPERATURE EFFECTS:

Operating Range: 0 ° to 70 ° C

Storage Temperature: -40 ° to 80 ° C

Temperature Coefficient: 100 ppm/ ° C

16. CONSTRUCTION: High impact black plastic case. (Mounting clip

included with panel mount models.)

17. RELATIVE HUMIDITY: Less than 85% RH.

18. WEIGHT:

Reflective Panel Mount: 0.76 oz (11 g);

Reflective PCB Mount: 0.54 oz (7.8 g)

Backlit Panel Mount: 0.96 oz (13.6 g);

Backlit PCB Mount: 0.75oz (10.4 g)

INSTALLATION

The MDMV meters are available in either a panel mount or printed circuit

board mount design. The panel mount units are provided with a mounting clip

to securely hold the unit in the panel cutout.

Panel mount installation:

1. Cut panel opening to

specified dimensions.

Remove burrs and clean

panel opening.

2. Install MDMV unit through

panel cutout as shown in

Figure 1.

3. Slide mounting clip over rear

of unit until clip is against

back of panel. The unit has

slots for the locking tabs to

hold it in the panel opening.

Note: Hold the MDMV front

bezel in place when sliding

the mounting clip in to

position.

PCB mount installation:

1. Prepare printed circuit board hole pattern to the specifications.

2. Unit should be hand soldered using good soldering techniques and hand

cleaned if necessary.

MDMV SIGNAL INPUT

The MDMV signal input range is from 0 to ±199.9 mVDC with automatic

zero adjustment. Signal inputs are not floating. The calibration does not require

adjustment, since the unit has been calibrated at the factory.

If the input signal exceeds 200 mV, the module will go into an overrange

condition. The unit will display a minus sign when the input high terminal is

negative with respect to the input low terminal.

FIGURE 2

Note: Incorrect supply polarity may permanently damage the unit.

WIRING CONNECTIONS

The electrical connections are made via

terminal pins located on the back of the

unit. The terminal pins are on 0.100"

center lines and can be mated with the

RLC Model HWK7 cable assembly or

many standard 0.100" center line

connectors. When wiring the unit, refer to

Figure 3 to identify the wire position with

the proper function.

There are certain considerations that

should be observed when running the

signal wires. A length of wire can act like

an antenna, and the closer it is to a source

of electrical noise, the more it becomes

susceptible to that noise. FIGURE 3

These are a few rules that should be followed when running these wires.

1. Never run signal wires in the same conduit or raceway with A.C. power lines,

conductors feeding motors, solenoids, SCR controls, heaters, etc.

2. Signal wires within enclosures should be routed as far away as possible from

contactors, control relays, transformers, and other noisy components.

3. When shielded wire is used, connect the shield to the common of the MDMV

unit, and leave the other end of the shield disconnected and insulated from

machine ground.

4. Connect common of the MDMV to machine ground at one point only.

PIN FUNCTIONS

+5 V - +5 VDC Positive Supply Terminal.

COMMON - Negative Supply Terminal.

INPUT LO - Signal Input Low Terminal.

Normally connected to Common.

INPUT HI - Signal Input High Terminal.

BACK PLANE - Back Plane Not Terminal. Any annunciator and/or

decimal point will appear when its terminal is

connected to this terminal.

BACK PLANE - Back Plane Terminal. Any annunciator and/or decimal

point NOT in use must be connected to this terminal.

DP3 - Thousandths decimal point position. *

DP2 - Hundredths decimal point position. *

DP1 - Tenths decimal point position. *

BAT - Low battery annunciator. *

m - Milli annunciator. *

μ - Micro annunciator. *

V - Volt annunciator. *

A - Ampere annunciator. *

* Note: All annunciators must be tied to either BACK PLANE orBACKPLANE

HANDLING PRECAUTIONS: This assembly contains electronic circuits

that are damaged by static electricity. Before handling the assembly,

discharge stray static electricity on your body by touching an earth ground

point. It is also important to handle the unit by the bezel assembly only.

Additionally, if it is necessary to handle a circuit board, be certain that hands

are free from dirt, oil, etc., to avoid circuit contamination that may lead to

malfunction.

BEZEL

MOUNTING CLIP

EXISTING PANEL THICKNESS

.031" to .125"

(.79 to 3.18)

LOCKING

TAB

FIGURE 1

PROCESS

CIRCUITRY

1MΩ

+5V

CALIBRATION

POT

+5V

BACKPLANE

INHI

INLO

COMMON

BATTERY

DP1

DP2

DP3

BLOCK DIAGRAM

+5V

COMMON

INPUT LO

INPUT HI

BACK PLANE

DP3

DP2

DP1

BAT

TYPICAL APPLICATIONS

The MDMV can be used in a wide variety of measurement applications. The

following circuits show some possibilities of the exceptional versatility of the

MDMV unit.

ORDERING INFORMATION

CURRENT MEASUREMENTS

Using a shunt resistor network, the MDMV voltmeter is capable of

displaying current.

FIGURE 4

900Ω

90Ω

9Ω

.9Ω

.1Ω

INHI

INLO

MDMV

PROCESS

CIRCUITRY

200μA F.S.

2mA F.S.

20mA F.S.

200mA F.S.

2A F.S.

INPUT ATTENUATORS

To measure voltages greater than

200 mVDC, a voltage divider network

is needed. Shown at right is a typical

circuit.

FIGURE 5

MULTI-RANGE MEASUREMENTS

To indicate various voltages in a multi-range application, it may be necessary

to switch the decimal point position and activate the appropriate annunciators.

This can be accomplished by connecting the appropriate annunciator terminals,

and the back plane. and the backplane terminals to a multi-position rotary

switch.

INHI

INLO

MDMV

PROCESS

CIRCUITRY

VIN

900KΩ

90KΩ

9KΩ

1KΩ

INHI

INLO

MDMV

PROCESS

CIRCUITRY

200mV F.S.

2V F.S.

20V F.S.

200V F.S.

VIN

FIGURE 6

.15 (3.8)

12 (305)

CIRCUIT #1; BROWN

.100 (2.54), TYP.

STRIPPED AND TINNED

COLOR CODED RIBBON CABLE

.100 (2.54), TYP.

ACCESSORY: MDMV CABLE ASSEMBLY

MODEL NO. DESCRIPTION PART NUMBER

Panel Mount W/Reflective Display MDMV0000

PC Board Mount W/Reflective Display MDMV0100

MDMV

Panel Mount W/Yel-Grn Backlighting MDMV0010

Panel Mount W/Red Backlighting MDMV0020

PC Board Mount W/Yel-Grn Backlighting MDMV0110

PC Board Mount W/Red Backlighting MDMV0120

HWK7 MDM Cable Assembly HWK70000

Red Lion Controls

Headquarters

20 Willow Springs Circle

York PA 17406

Tel +1 (717) 767-6511

Fax +1 (717) 764-0839

Red Lion Controls

China

Unit 101, XinAn Plaza

Building 13, No.99 Tianzhou Road

ShangHai, P.R. China 200223

Tel +86 21 6113-3688

Fax +86 21 6113-3683

Red Lion Controls

Europe

Printerweg 10

NL - 3821 AD Amersfoort

Tel +31 (0) 334 723 225

Fax +31 (0) 334 893 793

Red Lion Controls

India

54, Vishvas Tenement

GST Road, New Ranip,

Ahmedabad-382480 Gujarat, India

Tel +91 987 954 0503

Fax +91 79 275 31 350

LIMITED WARRANTY

The Company warrants the products it manufactures against defects in materials and

workmanship for a period limited to two years from the date of shipment, provided the products

have been stored, handled, installed, and used under proper conditions. The Company’s liability

under this limited warranty shall extend only to the repair or replacement of a defective product, at

The Company’s option. The Company disclaims all liability for any affirmation, promise or

representation with respect to the products.

The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify RLC

against damages, claims, and expenses arising out of subsequent sales of RLC products or products

containing components manufactured by RLC and based upon personal injuries, deaths, property

damage, lost profits, and other matters which Buyer, its employees, or sub-contractors are or may be

to any extent liable, including without limitation penalties imposed by the Consumer Product Safety

Act (P.L. 92-573) and liability imposed upon any person pursuant to the Magnuson-Moss Warranty

Act (P.L. 93-637), as now in effect or as amended hereafter.

No warranties expressed or implied are created with respect to The Company’s products except

those expressly contained herein. The Customer acknowledges the disclaimers and limitations

contained herein and relies on no other warranties or affirmations.