Martel Electronics DPM970 - Manual (Page 2)

APPLICATIONS
WARNING : Do not apply in excess of 500V a.c. to the meter.
3-Phase Current and Voltage
Measurement
Load PSU 303
Phase 3
Neutral
V-
V-
V+
110/240V
+5V
V+
COM
COM
ACI
ACV
Load PSU 303
Phase 1
V-
V-
V+
110/240V
+5V
0V
-5V
0V
-5V
0V
-5V
V+
COM
COM
ACI
ACV
Voltage
Current
Voltage
Current
Voltage
Current
Load PSU 303
Phase 2
V-
V-
V+
110/240V
+5V
V+
COM
COM
ACI
ACV
Voltage
Current
Single Phase Current and Voltage
Measurement
Load PSU 303
Phase
Neutral
V-
V-
V+
V-
V+
0V
110/240V
+5V
-5V
V+
COM
COM
ACI
ACV
Using a current transformer (CT) to
measure currents in excess of 10A a.c.
0V
V-
V+ Load Phase
Neutral
COM
ACI
CT
PSU 303
110/240V
+5V
-5V
Powering the LED backlighting on a DPM 970
from the PSU 303's +5V and COM outputs.
0V LP-
LP+
Phase
Neutral
PSU 303
110/240V +5V
-5V
COM
SCREW TERMINAL FUNCTIONS
ACV Alternating voltage measurement input, accepts up to 500V a.c. By changing the values of scaling resistors RA1, RA2 and RB, other voltage and
current ranges can be achieved. To measure in excess of 500V a.c., remove RA1, RA2 and RB from the meter and externally; link RA1 and RA2 on
the meter. See scaling table for suitable values for RA1, RA2 and RB.
ACI Alternating current measurement input.
See Scaling table for suitable values for shunt resistor RB.
COM Return line for voltage measurement input (ACV) or current measurement (ACI) input.
COM Return line for voltage measurement input (ACV) or current measurement (ACI) input.
V+ Positive power supply input.
V- Negative power supply input.
LP- Negative supply for LED backlighting.
LP+ Positive supply for LED backlighting.
TST Connect to V+ to display all segments except decimal points and annunciators.
It should not be operated for more than a few seconds as the DC voltage applied
to the LCD may “burn” the display. This connection is normally at 5V below V+
and is the ground for the digital section of the meter.
HLD Digital Hold option. Connect to V+ to hold last displayed reading indefinitely.
ALM Alarm “!” annunciator. Connect to XDP to display.
XDP Annunciator drive waveform. Used to drive alarm annunciator (ALM) if required.
V+ Auxilliary V+ for connections to decimal points DP1, DP2 or DP3.
DP1 199.9 Connect to V+ to display required decimal point.
DP2 19.99 Connect to V+ to display required decimal point.
DP3 1.999 Connect to V+ to display required decimal point.
To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s connectors must not exceed 500VRMS. If voltages to be measured
exceed 500VRMS, then fit scaling resistors externally to the module. If the mains power supply is connected to the module, then all the module’s connectors
must be considered to be floating at mains potential. Consequently due caution must be exercised when connecting to the module’s connector functions
under these conditions. The user must ensure that the incorporation of the DPM 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).
SAFETY WARNING
Specifications liable to change without prior warning DPM 970 Issue 5 August/2002 M.C. Applies to DPM 970/4
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
WILTSHIRE SP5 2SJ UK
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
E-mail: [email protected]
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: [email protected]
LASCAR ELECTRONICS INC.
3750 West 26th Street,
Erie, PA 16506 USA
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
E-mail: [email protected]
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com