Martel Electronics QM150V-01 User Manual
QM150V-01
EMV 1025S-0 1 Single Hole Mounting Meter
QM150V-01
EMV 1025S-0 1 is an easy to mount LCD digital voltmeter. It features 200mV full scale reading,
only 3 wires to connect. The user need only drill a single 5.5mm / " hole in the panel. The module is
the hole, adding the washer and tightening the nut provided. The module's connections pass through the hollow stud into the target application.
included, providing splashproof protection for the unit when fitted to the meter during installation.
This datasheet also refers to OEM variants, referred to as EMV 1025S-X X, where X X refers to the factory-configured scaling and decimal configuration options.
QM150V-XX
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32
auto-zero and auto-polarity. Installation time is greatly reduced with
fitted to the panel by locating its screw threaded stud through
A rubber seal is
Single Hole Mounting
12.5mm / 0.5" LCD Digit Height
200mV Full Scale Reading
3-Wire Connection
Auto-zero, Auto-polarity
Low Battery Warning
Splashproof
Stock Numbers*
EMV 1025S-X X
QM150V-X X
Range Decimal Point
0=200mV 0=NO DP
1=2V 1=DP1
2=20V 2=DP2
3=200V** 3=DP3
QM150V-13
e.g.: EMV 1025S-1 3 2Vd.c. full scale, DP3 displayed
For modules manufactured to your scaling requirements,
contact Lascar direct.*
* Minimum order quanitity of 50 pcs. applies.
** Maximum allowable input voltage is 60Vd.c.
(1.999)
-
-
-
Shown Actual Size
Specifications Min. Typ. Max. Unit
Accuracy (overall error)* 0.1 % (±2 counts)
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 3.5 5 7.0 V d.c.
Supply current 250
* To ensure maximum accuracy, recalibrate periodically.
Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and
are tested with the module configured for fully floating input mode.
1
µA
A supply clock
DIMENSIONS All dimensions in mm (inches)
31 (1.22)
14.5
(0.57)
DP3 DP2 DP1
10.5
(0.4)
10.5
(0.4)
REAR VIEW
CAL
22 (0.87)
Module thickness 5.5mm (0.22)
22 (0.87)
5.00
(0.20)
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
QM150V-X X
EMV 1025S-X X
5.5 (0.2)
FITTING THE EMV 1025S-0 1
Drill a 5.5mm / " hole in the panel.
module to the panel by passing its screw threaded stud through the hole, fitting the
washer and tightening the nut provided. Do
damage the meter.
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www.lascarelectronics.com
Seal
9.0
(0.35)
QM150V-01
Panel
Washer
Fit seal to the rear of the module. Fit the
3 Wires - 30cm (12.0)
Nut
not to overtighten the nut as this may
E-mail: sales@lascar.co.uk E-mail: b4lascar@samsongroup.com.hkE-mail: us-sales@lascarelectronics.com
TERMINAL FUNCTIONS
1. Red V+ Positive powersupplyconnection.
2. Black GND Negative powersupply connection.
3. Yellow IN HI Positive measuringinput with reference to GND.
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 EquipmentforMeasuring,ControlandLaboratoryUse).
VOLTAGE SCALING
Two resistors Ra and Rb may be added in order
to alter the full scale reading (FSR) of the meter see table and diagrams below. The meter may
be re-calibrated by adjusting the calibration
potentiometer at the rear of the module.
Required V Ra Rb
2V* 910k 100k
20V* 1M 10k
200V* 1M 1k
FSR
ΩΩ
ΩΩ
ΩΩ
* Subject to a minimum order quantity of 50
pcs., pre-scaled modules are available from
Martel.
Lascar. See stock number table on the front of
this datasheet. Customer-specificscalingoptions
may also be available on request. ContactLascar
sales officefordetails.
Martel
CURRENT SCALING
A current shunt Rs may be added in order to
alter the full scale reading (FSR) of the meter see table and diagrams below. The meter may
be re-calibrated by adjusting the calibration
potentiometer at the rear of the module.
Required I Rs P
FSR
200uA 1k 0.04mWΩ
2mA 100 0.4mW
20mA 10 4mW
200mA 1 40mW
2A 100m 400mW
20A 10m 4W
200A 1m 40W
Ω
Ω
Ω
Ω∗∗
Ω∗∗
Ω
(Power Rating)
** We recommend that purpose made shunts
are usedforthese ranges.
APPLICATIONS
Do not connect more than one meter to the same power supply if the meters cannot use the same signal ground. Do not connect IN HI to a voltage greater than
(V+ - 1V )or to a voltage lower than (-(V+) + 1V) if the meter is unscaled, as this may damage the meter. Keep leads short to ensure noise-free operation. To
maximise measurement accuracy, use high precision (1%), low temperature drift (50ppm/°C or better) scaling resistors (Ra, Rb and Rs).
V+
Supply Voltage
0V
V
supply
(8-30V)*
7805
220nF 470nF
Measuring current.
+5V
GND
I
V+
Load
IN HI
Rs
Rs = V
FSR
I
FSR
Vin
Voltage to be
measured
0V
Ra
+3.5 to +7.5V d.c.
V+
IN HI
Rb
GND
Measuring a single ended input
referenced to supply.
V
supply
(8-30V)*
7805
220nF 470nF
+5V
Measuring supply voltage and current.
V+
GND
IN HI
The module shown is an EMV 1025S-0 2
=5k
Rs
Load
I
S selects between voltage and current measurement
1
Voltage: Ra,RbandRcal scale the module for 20V
R
L
Current: Rs = 200mV
Calibration:
First calibrate the current range, by adjusting the meter's own calibration
potentiometer. Then calibrate the voltage range, by adjusting the R
potentiometer.
Ra=1M
A
S
1
V
Rb=8k
R
CAL
Shunt
QM150V-02
Ω I
(e.g. 10m / 4W for =20A)
I
FSR
FSR
FSR
CAL
* Consult 7805 voltage regulator manufacturer's datasheet for minimum and maximum allowable input voltage ratings.
Specifications liable to change without prior warning EMV 1025S-X X Issue 4 August/2002 M.C. Applies to EMV 1025S/1
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
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