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Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053
Toll Free: (800) 821-0023 Phone: (603) 434-1433 Fax: (603) 434-1653
WIRE FUNCTIONS
RED V+ Positive power supply connection.
BLACK 0V Negative power supply connection.
WHITE Vin Positive measuring input with reference to 0V.
Range from 0 to 1V d.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, use 1% metal film resistors.
Voltage
Ra
Required F.S.R.
10V
100V
10mA
100mA
Current
Ra
910k
1M
0R
0R
Rb
100k
10k
100R
10R
+
Vin
Ra=1M
+
Vin
V1
-
Rb
V2
0V
Rb=Ra. V2
V1-V2
.
-
I FSD
Rs
0V
Rs= 1V
I 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
+
Vin
V+
5...12Vd.c.
Power
Supply
Load
Vin
V+
5...12Vd.c.
0-1Vd.c.
-
0V
0V
Rs
0V
0V
Measuring a voltage in the range
0 to 1V d.c.
Measuring a d.c. current.
Rs = 1V
I
5...12Vd.c.
V+
I
Ra
Vin
Power
Supply
Load
Vin
V+
Rb
Voltage
0V
Rs
Current
0V
0V
Simultaneous d.c. Voltage and Current Measurement.
Rs = 1V
I
Specifications liable to change without prior warning
QM 130M
Issue 8
September/2001
M.C.
Applies to QM 130M
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