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E-mail: sales@lascar.co.uk
TERMINAL FUNCTIONS
E-mail: us-sales@lascarelectronics.com
E-mail: b4lascar@samsongroup.com.hk
1.
2.
3.
Red
Black
Yellow
V+
GND
IN HI
Positive power supply connection.
Negative power supply connection.
Positive measuring input 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 Equipment for Measuring, Control and Laboratory Use).
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.
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 V FSR
2V*
20V*
200V*
Required I FSR
200uA
2mA
20mA
200mA
2A
20A
200A
Ra
910k ?
1M ?
1M ?
Rs
1k ?
100 ?
10 ?
1 ?
100m ???
10m ???
1m ?
Rb
100k ?
10k ?
1k ?
P (Power Rating)
0.04mW
0.4mW
4mW
40mW
400mW
4W
40W
Lascar.
Lascar
* Subject to a minimum order quantity of 50
pcs., pre-scaled modules are available from
Martel. See stock number table on the front of
this datasheet. Customer-specific scaling options
may also be available on request. Contact Martel
sales office for details.
** We recommend that purpose made shunts
are used for these 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).
+3.5 to +7.5V d.c.
V+
V+
Vin
Voltage to be
measured
Ra
IN HI
Rb
GND
Supply Voltage
V supply
(8-30V)*
7805
220nF
+5V
470nF
V+
I
Load
0V
0V
Measuring a single ended input
GND
IN HI
referenced to supply.
Measuring current.
Rs
Rs = V FSR
I FSR
EMV1025S-0
The module shown is an QM150V-02 2
7805
+5V
Ra=1M
I
S 1 selects between voltage and current measurement
V+
V supply
(8-30V)*
220nF
470nF
IN HI
A
S 1 V
Rb=8k
Load
R L
Voltage: Ra, Rb and Rcal scale the module for 20V FSR
I FSR
Current: Rs = 200mV (e.g. 10m ? / 4W for I FSR =20A)
GND
Measuring supply voltage and current.
R CAL =5k
Rs
Shunt
Calibration:
First calibrate the current range, by adjusting the meter's own calibration
potentiometer. Then calibrate the voltage range, by adjusting the R CAL
potentiometer.
* 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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