Martel Electronics QM140V User Manual

DIMENSIONS

All dimensions in mm (inches)

FITTING THE EMV 1125

Drill a 5.5mm / " hole in the panel.

not toovertighten the nut as thismay damage the meter.

Fit the module to the panel by passing its screw threaded stud and the wires through the hole, fitting the washer and tightening the nut provided. Take care not to trap any of the connecting wires. Do

EMV 1125 isan easy to mountLCD digital panel meter. Theuser need only drill asingle 5.5mm / hole in thepanel. The module isfitted to the panelby locating its screw threaded stud through the hole, fitting the washer and tightening the nut provided. The module's 10 connecting wires pass through the hollow stud into the target application,where they canbe easily soldered into place. The module features 200mV fullscale input, auto-zero and auto-polarity. A separate screw terminal adaptor board (T/BLK-4) simplifies connectionandcalibration.

Single Hole Mounting

200mV Full Scale Reading

12.5mm / 0.5" LCD Digit Height

Auto-zero, Auto-polarity

10 Wire Connections

Low Battery Warning

Screw Terminal Board Option (T/BLK-4)

EMV 1125

Single Hole Mounting Meter

Stock Number

Easy Mounting Voltmeter EMV 1125 Optional Screw Terminal Adaptor Board T/BLK-4

Specification Min. Typ. Max. Unit

Accuracy (overall error)* 0.05 0.1 % (±1 count) Linearity ±1 count Displayed reading -1999 1999 Resolution 0.1 mV d.c. Sample rate 3 sample/sec Operating temperature range 0 50 °C Temperature stability 100 ppm/°C Supply voltage 7.5 9 15 V d.c. Supply current 150

* To ensure maximum accuracy, re-calibrate periodically.

µA

WEBSITE: http://www.lascarelectronics.com/

Shown Actual Size

REAR VIEW

EMV 1125 T/BLK-4

Panel 10 Wires (30cm)

Shakeproof

Washer

Nut

21.40 (0.84)

10.70 (0.42)

5.00 (0.20)

10.70 (0.42)

43.50 (1.71)

21.75 (0.85)

SAFETY

To comply with the Low Voltage Directive(LVD 93/68/EEC), input voltages to the module’s pinsmust not exceed 60Vd.c.If voltagesto the measuring inputs do exceed 60Vd.c., then fit scaling resistors externally to the module. The user must ensure that the incorporation of the meter into the user’s equipment conforms tothe relevantsections of BS EN61010 (Safety Requirements for ElectricalEquipment forMeasuring, Control and LaboratoryUse).

Module thickness 5.5mm (0.22)

If T/BLK-4 is not fitted, then do not fit the first nut.

9.0

(0.35)

Adding a calibration circuit when T/BLK-4 is not used

Note: The calibration circuit must always be fitted, even when scaling resistors are not fitted. This circuit is fitted as standard on T/BLK-4.

100k

1k5

CAL

V+

(Red/2)

Vref

COM

(Orange/3)

(Brown/1)

WIRE CONNECTIONS and SCREW TERMINAL FUNCTIONS

(EMV 1125) (T.BLK-4)

0. Black (BK) V- Negative power supply connection.

1. Brown (BR) COM The ground for the analogue section of the A/D converter,held activelyat 2.8V(nom.)belowV+. COM must not be allowed to sink excessivecurrent (>100 A)byconnecting it directly to a higher voltage. Positivepower supplyconnection.

3. Orange (OR) Vref Connection forcalibration circuit(seediagrambelow).

4. Yellow (YL) IN HI Positive measuring differential input. IN HI and IN LO must be no closer than 1V to either the positiveor negativesupply.

5. Green (GN) INLO Negative measuringdifferentialinput. (On T/BLK-4,INLO is connectedtoCOMvianormally-closedLinkL2.)

6. Blue (BL) DP COM Commonconnection fordecimal pointsDP1, DP2andDP3,seebelow.

2. Red (RD) V+

7. Violet(VI) DP1 199.9

8. Grey (GY) DP2 19.99 Connect to DP COM to display required decimal point.

9. White (WT) DP3 1.999 (or makeappropriate solderlink onT/BLK-4)

Do notconnect more than one meter to the same powersupply if the meters cannot use the same signalground. Taking any input beyond the power supplyrails will damage themeter. Keep leads shortto ensure noise-free operation.

Specifications liable to change without prior warning EMV 1125 Issue 3 January/2001 M.C. Applies to EMV 1125/2

Required F.S.R. Ra Rb CAL

200mV N/A N/A Adjust 2V 910k 100k 20V 1M 10k 200 A 0R 1k 2mA 0R 100R 20mA 0R 10R Ad 200mA 0R 1R

Adjust Adjust Adjust Adjust

just

Adjust

SCALING and CALIBRATION

A calibrationcircuit andtwo resistors (Raand Rb)may be added on the EMV 1125 or T/BLK-4 board (cut Link La if fitting Ra) to alter the full scale reading of the meter - see table. Note that the meter will have to be (re-)calibrated byadjusting thepotentiometer.

APPLICATIONS

INPUT

Ra 100k

IN HI

(Yellow/4)

IN LO

(Green/5)

Adding an input filter and scaling resistors when T/BLK-4 is not used

100nF

Note: To reduce noise on the meter's input, fit the input filter components (1M and 10nF) shownabove. Theinput filter is fitted as standardon T/BLK-4.

CAL

V- V +

INHI

INLO

123

BK BR RD OR YL GN BL VI GY WT

Solder wires from EMV 1125

Calibration potentiometer

Scaling resistors (values for 2V and 20V FSD Supplied with T/BLK-4)

Decimal point links

Connecting to T/BLK-4

Measuring current. Recalibrate the module. The current to be measured must be isolated from the module's power supply.

Rb =I0.2

Full Scale

Supply Voltage

Current to be

measured

CAL

V- V+

INHI

INLO

123

BK BR RD OR YLGN BL VI GY WT

Supply Voltage

CAL

V- V+

INHI

INLO

123

GN BL VI GY WT

Measuring a supply voltage. (min. 7.5V, max. 15V) Cut Links La and L2. Recalibrate the module.

510k

10k

Measuring a floating voltage source of 200mV full scale. Add Ra and Rb and cut Link La to increase the measurement range.

Supply Voltage

+200mV

Input Voltage

CAL

V- V+

INHI

INLO

123

BK BR RD OR YLGN BL VI GY WT

BK BR RD OR YL

LASCAR ELECTRONICS LTD. LASCAR ELECTRONICS INC. MODULE HOUSE, WHITEPARISH, PO BOX 50727, PALO ALTO, WILTSHIRE. SP5 2SJ UK CA 94303-0727 USA TEL: ++44 (1794) 884567 F TEL: ++1 (650) 838 9027AX: ++44 (1794) 884616 FAX: ++1 (650) 833 5432