Martel Electronics QM130M User Manual

QM 130 M 9SegmentLCDMeter

This low cost, compactindicatorisideally suited for low or highvolumeapplications. The meter features a 9segmentLCDtodisplay 1V d.c.
full scale reading. Other voltagesandcurrents can be measured viatheadditionof2scaling resistors. The meter canbeusedinapplications
where the orderofmagnitude of the reading ismoreimportant than the value ofthereading itself. It allows theoperatorto scan the display
and receive a quick visual feedback. Installation is particularly easy; the module requires only a single round hole in the panel. A rubber
seal is included, providing splashproof protection for the unit when fitted to the meter during installation.

9 Segment LCD

Colour Scale

Auto-zero

1V d.c. Full Scale Reading

Single Hole Mounting

No Calibration Required

Splashproof

Stock Number

StandardMeterQM 130M

Specification Min. Typ. Max. Unit

Accuracy (overall error) * 1 Segment ( 1)
Full scale reading 1 V d.c.
Resolution 125 mV d.c.
Sample rate samples/sec
Operating temperature range 0 50 °C
Supply voltage (V+ to V-) 5 9 12 V d.c.
Supply current (@5Vd.c.) mA

10

6

+

* At voltages above 1V d.c., the display flashes.

DIMENSIONS All dimensions in mm (inches)

Seal

Panel

QM 130 M

21.40 (0.84)

/

32

43.50 (1.71)

21.75 (0.85)

5.00
(0.20)

14.0 (0.55)

9.0

(0.35)

31.0 (1.22)

Viewing Area

Washer

(Display shown in overrange mode)

10.70
(0.42)

10.70
(0.42)

PANELFITTING

Drill a5.5mm / " holein the panel. Fit seal tothe rear ofthe module. Fit the module to the panel by passing its screw threaded studand the wiresthrough the
hole, fitting the washer and tightening the nut. Take care not to trap any of the connecting wires. Do not to overtighten the nut as this may damage the meter.

REAR VIEW

21.75 (0.85)

Module thickness: 5.5mm (0.22")

7

3 Wires - 30cm (12.0)

Nut

Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053
Toll Free: [phone] Phone: [phone] Fax: [phone]

WIRE FUNCTIONS

RED V+ Positivepower supplyconnection.
BLACK 0V Negative powersupplyconnection.
WHITE Vin Positivemeasuring inputwithreference to0V.

Range from0to 1Vd.c.

SCALING

Two external resistors may be used to alter the full scale
reading of the meter - see table for sample values.
Alternatively, use the following formulae to calculate Ra
and Rb. Select the nearest available standard resistor. To
achieve optimum accuracy, use1%metalfilmresistors.

Required F.S.R. Ra Rb

10V 910k 100k
100V 1M 10k
10mA 0R 100R
100mA 0R 10R

Voltage

Ra

+

V1 V2

Rb

-

Vin

0V

Ra=1M

Rb=Ra.

V2 .

V1-V2

Current

+

-

Vin

I

FSD

Rs

0V

Rs=I1V

FSD

SAFETY

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. The user must
ensure that the incorporation of the unit into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements
for Electrical Equipment for Measuring, Control and Laboratory Use).

VARIOUS OPERATING MODES

5...12Vd.c.

V+

0V

0V

0-1Vd.c.

5...12Vd.c.

V+

Vin

+

0V

-

0V

Power
Supply

Load

Vin

Rs

Measuring a voltage in the range

Measuring a d.c. current.

0 to 1V d.c.

Rs =I1V

5...12Vd.c.

V+

Power
Supply

I

Load

Rs

Vin

Current

V+

0V

Ra

Vin

Rb

Voltage

0V

0V

Simultaneous d.c. Voltage and Current Measurement.

Rs =I1V

SpecificationsliabletochangewithoutpriorwarningQM 130M Issue8September/2001M.C.AppliestoQM 130M