Omega DP3001 User Manual

User’s Guide

™

http://www.omega.com

e-mail: info@omega.com

DP3001

DIGITAL PANEL VOLTMETER

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

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

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.

iii

1.0 GENERAL INFORMAT I ON

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 SPECIFICAT I ONS

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

2.4 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

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

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

2.9 ENVIRONMENTAL

Operating temperature 0 to +60°C Storage temperature -40 to +85°C Relative humidity 95% RH to +40°C (non-condensing)

-4.6 Vdc ±5% at 10 mA max

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