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PO Box 770, 3750 Londonderry, NH 03053 1-800-821-0023
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
ELECTRONICS LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
www.martelcorp.com (814) 838 8141
WILTSHIRE SP5 2SJ UK Erie, PA 16506 USA
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616 TEL: +1 (814) 835 0621 FAX: +1
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: sales@lascar.co.uk
SCREW TERMINAL FUNCTIONS
E-mail: us-sales@lascarelectronics.com
E-mail: b4lascar@samsongroup.com.hk
ACV
ACI
COM
COM
V+
V-
LP-
LP+
TST
HLD
ALM
XDP
V+
DP1
DP2
DP3
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.
Alternating current measurement input.
See Scaling table for suitable values for shunt resistor RB.
Return line for voltage measurement input (ACV) or current measurement (ACI) input.
Return line for voltage measurement input (ACV) or current measurement (ACI) input.
Positive power supply input.
Negative power supply input.
Negative supply for LED backlighting.
Positive supply for LED backlighting.
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.
Digital Hold option. Connect to V+ to hold last displayed reading indefinitely.
Alarm “!” annunciator. Connect to XDP to display.
Annunciator drive waveform. Used to drive alarm annunciator (ALM) if required.
Auxilliary V+ for connections to decimal points DP1, DP2 or DP3.
199.9 Connect to V+ to display required decimal point.
19.99 Connect to V+ to display required decimal point.
1.999 Connect to V+ to display required decimal point.
SAFETY WARNING
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).
APPLICATIONS
Phase
WARNING : Do not apply in excess of 500V a.c. to the meter.
LP+
V+
V-
+5V
COM
-5V
110/240V
PSU 303
Neutral
LP-
0V
Phase 1
ACV
COM
Voltage
V+
V-
Powering the LED backlighting on a DPM 970
from the PSU 303's +5V and COM outputs.
Load
ACI
COM
Current
V+
V-
+5V
-5V
110/240V
PSU 303
0V
Phase
ACV
Voltage
V+
V+
Phase 2
Load
ACV
COM
ACI
COM
Voltage
Current
V+
V-
V+
V-
+5V
-5V
110/240V
PSU 303
0V
Neutral
Load
COM
V-
Current +5V
ACI
-5V
COM
V-
Single Phase Current and Voltage
110/240V
PSU 303
0V
Measurement
Phase 3
ACV
Voltage
V+
Load
COM
ACI
COM
Current
V-
V+
V-
+5V
-5V
110/240V
PSU 303
0V
Phase
Neutral
Load
CT
ACI
COM
V+
V-
+5V
-5V
110/240V
PSU 303
0V
Neutral
3-Phase Current and Voltage
Measurement
Using a current transformer (CT) to
measure currents in excess of 10A a.c.
Specifications liable to change without prior warning
DPM 970
Issue 5
August/2002
M.C.
Applies to DPM 970/4
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