Omega DP3001 User manual

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User’s Guide
DP3001
DIGITAL PANEL VOLTMETER
ROHS 2 COMPLIANT

i
TABLE OF CONTENTS
SAFETY CONSIDERATIONS ......................................................................................... iii
1.0 GENERAL INFORMATION ........................................................................................ 1
2.0 SPECIFICATIONS..................................................................................................... 1
2.1 Analog Input ......................................................................................................... 1
2.2 Reference Input for 3-Wire Ratio.......................................................................... 1
2.3 Noise Rejection .................................................................................................... 1
2.4 Accuracy at 25°C.................................................................................................. 2
2.5 Digital Inputs......................................................................................................... 2
2.6 Analog-to-Digital Conversion................................................................................ 2
2.7 Display.................................................................................................................. 2
2.8 Power ................................................................................................................... 2
2.9 Environmental ...................................................................................................... 2
2.10 Mechanical ........................................................................................................... 3
3.0 MECHANICAL ASSEMBLY & INSTALLATION.......................................................... 3
3.1 Case Dimensions ................................................................................................. 3
3.2 Panel Mounting .................................................................................................... 4
4.0 POWER & SIGNAL .................................................................................................... 5
4.1 Changing Operating Voltage ................................................................................ 5
4.2 Power and Signal Connections ............................................................................ 5
4.3 Main Board Pin Assignments ............................................................................... 6
4.4 Signal Inputs......................................................................................................... 8
5.0 CONFIGURATION .................................................................................................... 9
5.1 Decimal Point Selection ....................................................................................... 9
5.2 Voltage Range Selection.................................................................................... 10
6.0 CALIBRATION.......................................................................................................... 11
7.0 DRAWINGS.............................................................................................................. 12
8.0 DUAL-SLOPE CONVERSION.................................................................................. 13

ii
LIST OF FIGURES:
Figure 3.1 DIN Case Dimensions.................................................................................. 4
Figure 3.2 Exploded View.............................................................................................. 5
Figure 4.1 Side View of Transformer............................................................................. 6
Figure 4.2 Rear Terminal Hookups ............................................................................... 7
Figure 5.1 Display Board Jumper Locations................................................................ 10
Figure 5.2 Main Board Jumper Locations.................................................................... 11
Figure 5.3 Solder Switch Locations............................................................................. 12
Figure 7.1 Assembly Diagram, Main and Display Board ............................................. 13
Figure 8.1 Dual-slope Conversion Diagram ................................................................ 14

iii
SAFETY CONSIDERATIONS
This device is marked with the international Caution symbol. It is important to read
this manual before installing or commissioning this device as it contains important
information relating to Safety and EMC (Electromagnetic Compatibility).
Unpacking & Inspection
Unpack the instrument and inspect for obvious shipping damage. Do not attempt to
operate the unit if damage is found.
This instrument is a panel mount device protected in accordance with Class I of EN
61010 (115/230 AC power connections). Installation of this instrument should be done by
Qualified personnel. In order to ensure safe operation, the following instructions should
be followed.
This instrument has no power-on switch. An external switch or circuit-breaker shall be
included in the building installation as a disconnecting device. It shall be marked to
indicate this function, and it shall be in close proximity to the equipment within easy reach
of the operator. The switch or circuit-breaker shall not interrupt the Protective Conductor
(Earth wire), and it shall meet the relevant requirements of IEC 947-1 and IEC 947-3
(International Electrotechnical Commission). The switch shall not be incorporated in the
mains supply cord.
Furthermore, to provide protection against excessive energy being drawn from the mains
supply in case of a fault in the equipment, an over-current protection device shall be
installed.
•The Protective Conductor must be connected for safety reasons. Check that the
power cable has the proper Earth wire, and it is properly connected. It is not
safe to operate this unit without the Protective Conductor Terminal connected.
•Do not exceed voltage rating on the label located on the top of the
instrument housing.
•Always disconnect power before changing signal and power connections.
•Do not use this instrument on a work bench without its case for safety
reasons.
•Do not operate this instrument in flammable or explosive atmospheres.
•Do not expose this instrument to rain or moisture.
•Unit mounting should allow for adequate ventilation to ensure instrument
does not exceed operating temperature rating.
•Use electrical wires with adequate size to handle mechanical strain and
power requirements. Install without exposing bare wire outside the connector
to minimize electrical shock hazards.
EMC Considerations
•Whenever EMC is an issue, always use shielded cables.
•Never run signal and power wires in the same conduit.
•Use signal wire connections with twisted-pair cables.
•Install Ferrite Bead(s) on signal wires close to the instrument if
EMC problems persist.

1
1.0 GENERAL INFORMATION
This voltmeter is a 4 1/2 digit panel meter for applications which require
a compact, quality DC voltmeter. This model uses dual-slope conversion.
Additionally, it provides automatic zeroing before each reading and does so with
a minimum of parts for increased reliability.
The voltmeter has a resolution of 1 part in ±19999 counts. By using an external
DC voltage reference, any of the given ranges can be configured for 3-wire
(common ground) ratio measurement with readout from 0 to 1.9999.
Standard features include selectable decimal point location, display hold, test and
blanking. Each model contains the required circuitry for full range selection and
easy configuration.
2.0 SPECIFICATIONS
2.1 ANALOG INPUT
Model -3 -4 -5
Range ±1.9999 Vdc ±19.999 Vdc ±199.99 Vdc
Resolution 0.1 mV 1 mV 10 mV
Maximum input 250 V rms, 350 Vp 250 V rms, 1000 Vp 250 V rms,1000 Vp
Input resistance 1 Gohm 1 Mohm 1 Mohm
Bias current 10 pA 1 pA 1 pA
Configuration differential
Zero automatic
Span adjustment ±5%
2.2 REFERENCE INPUT FOR 3-WIRE RATIO
Analog input range ±2 Vdc, ±20 Vdc, ±200 Vdc
Reference voltage +0.5 to +2.0 V
Load on reference 80 ohm (std), 100 Mohm (opt)
Accuracy 99.95%
2.3 NOISE REJECTION
NMR, sig hi to sig lo 56 dB at 50/60 Hz
CMR, sig lo to ana gnd 86 dB from DC to 60 Hz
CMV, sig lo to ana gnd ±1.0 Vdc
CMR, ac gnd to ana gnd 120 dB from DC to 60 Hz
CMV, ac gnd to ana gnd 2100 Vp per HV test, 354 Vp per IEC 348 spacing

2
2.4 ACCURACY AT 25°C
Maximum error ±0.01% of reading ±2 counts
Span tempco ±0.01% of reading/°C
Step response 1 second
Warm-up to rated accuracy 10 minutes
2.5 DIGITAL INPUTS Positive true referenced to DIG GND
2.6 ANALOG-TO-DIGITAL CONVERSION
Technique Dual-slope, average-value
Input integration period 100 milliseconds
Read rate 2.5/second
2.7 DISPLAY
Digit type 7 segments, 14.2 mm (0.56 in) height
Symbols -1.8.8.8.8
Decimal Points 4 positions, programmable internally or
at the rear connector
Overrange indication 4 least-significant digits flash
2.8 POWER
Standard AC power voltage 115 or 230 Vac ±15%
AC frequency range 49 to 440 Hz
Optional DC power voltage 9-32 or 26-56 Vdc, isolated to 300 Vp
Power consumption 2.4 W
Output voltages +4.7 Vdc ±5% at 10 mA max
-4.6 Vdc ±5% at 10 mA max
2.9 ENVIRONMENTAL
Operating temperature 0 to +60°C
Storage temperature -40 to +85°C
Relative humidity 95% RH to +40°C (non-condensing)
Input Logical 0 Logical 1 Sink Source
HOLD 0 to 0.8 V 2.8 to 5.0 V 0.1 mA 10 µA
LAMP TEST 0 to 0.6 V 2.0 to 5.0 V 1.3 mA 20 µA
DISPLAY BLANKING 0 to 0.6 V 2.0 to 5.0 V 1.3 mA 20 µA

3
2.10 MECHANICAL
96 x 48 x 5.1 mm (3.78 x 1.89 x 0.20 in)
104 mm (4.09 in)
92 x 45 mm (3.62 x 1.77 in)
400 g (14 oz)
94V-0 UL-rated polycarbonate
PCB edge connector with a double row of
18-pins, 3.96 mm (0.156 in) spacing between pins
Barrier terminal strip with six #6 screw
Bezel
Depth behind bezel
(with connector)
Panel cutout
Weight
Case material
D1 connector option
D4 connector option
connections for signal and power (removes
these inputs from D1)
3.0 MECHANICAL ASSEMBLY AND INSTALLATION
3.1 CASE DIMENSIONS
Figure 3.1 DIN Case Dimensions

4
Figure 3.2 Exploded View
3.2 PANEL MOUNTING
1. Remove main board connector J1, if installed. Loosen the two clamp screws
(with a #8 Phillips screwdriver) on the rear of case and rotate the slide
clamps. Push the two slide retainers toward the rear of the unit and remove
them.
2. Working from the front of the panel, insert the meter into the panel cutout
(refer to case dimensions shown below).
3. Push the slide retainers onto the case to fit tightly against the panel rear.
Rotate slide clamps back into original position and tighten clamp screws just
enough to hold the case in place. Never over-tighten clamp screws.
4. Reinstall any connectors and snap on the terminal block cover.
I.D. LABEL
CASE, TOP
PARALLEL BCD
OUTPUT BOARD
(F2N OPTION)
LENS
SPAN ADJUST
TA B
SLIDE RETAINER (2)
TERMINAL
BLOCK
COVER
SIGNAL INPUT
POWER INPUT
MAIN BOARD
CASE, BOTTOM
SLIDE CLAMP (2)
SLIDE SCREW (2)