Omega DP301AN User manual

DP301AN DC VOLTMETER
DP301AN-AC VOLTMETER
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User’s Guide

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i
TABLE OF CONTENTS
SAFETY INSTRUCTIONS........................................................................................ iii
1.0 GENERAL INFORMATION............................................................................... 1
2.0 SPECIFICATIONS............................................................................................. 1
2.1 Analog Input................................................................................................ 1
2.2 Accuracy at 25°C......................................................................................... 2
2.3 Noise Rejection .......................................................................................... 2
2.4 Analog-To-Digital Conversion...................................................................... 2
2.5 3-Wire Ratio Reference............................................................................... 2
2.6 Display......................................................................................................... 2
2.7 Digital Signals ............................................................................................. 3
2.8 Power.......................................................................................................... 3
2.9 Environmental ............................................................................................. 3
2.10 Mechanical.................................................................................................. 3
3.0 MECHANICAL ASSEMBLY AND INSTALLATION ........................................... 4
3.1 Panel Mounting .......................................................................................... 4
4.0 POWER AND SIGNAL...................................................................................... 6
4.1 Changing Operating Voltage....................................................................... 6
4.2 Power and Signal Connections................................................................... 6
4.3 Connector Pin Assignments........................................................................ 8
4.4 Digital Test Signals ..................................................................................... 9
5.0 CONFIGURATION ..........................................................................................10
5.1 Decimal Point Selection ..............................................................................10
5.2 Voltage Range Selection.............................................................................11
5.3 Blanking Least-Significant Digit ..................................................................12
6.0 CALIBRATION...................................................................................................13
6.1 DC Voltage Ranges ....................................................................................13
6.2 AC Voltage Ranges ....................................................................................13
7.0 DRAWINGS ......................................................................................................14

ii
ILLUSTRATIONS
Figure 3-1 DIN Case Dimensions............................................................................. 4
Figure 3-2 Exploded View ....................................................................................... 5
Figure 4-1 Main Board ............................................................................................. 6
Figure 4-2 Rear Terminal ......................................................................................... 6
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.................................................................................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 overcurrent 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.

1.0 GENERAL INFORMATION
The two versions of voltmeters are different pinout versions of the same 3 1/2
digit panel meter for applications which require a compact, quality dc voltmeter.
Standard features include HOLD function, selectable decimal point location and
LAMP TEST.
Each model contains the circuitry for all ranges. The range is changed by
opening and closing the appropriate switches on the printed circuit board via
installation of push-on jumpers.
1.1 MODEL DP301AN
Model DP301AN is pin compatible with newer voltmeters DP302, DP3001 and
DP3002 series.
Models DP301AN has a resolution of 1 part in ±1999 counts, or 0.05% of full
scale.By using an external dc voltage reference, any of these ranges can be
configured for 3 wire ratio measurement with readout from 0 to 1.999.
1.2 MODEL DP301AN-AC
Model DP301AN-AC, for AC power line monitoring, has a screw terminal barrier
strip for signal and power.This model uses a half wave average converter
calibrated to read RMS. It offers input ranges of 199.9 and 650V ac, with
resolution of 100 mV and 1V,respectively. Maximum rated input in either range is
650V RMS or 920 Vp.
2.0 SPECIFICATIONS
2.1 ANALOG INPUT
Model "AN"
Signal ranges ±199.9mV ±1.999V ±19.99V ±199.9V
Bias current 50 pA 50 pA 5 pA 1 pA
Maximum input 130 Vp 130 Vp 250 Vp 250 Vp
Resolution 100 uV 1 mV 10 mV 100 mV
Input resistance 1 GΩ1 GΩ1.1 MΩ1.0 M^N8,50
Configuration Differential, bipolar
Zero Automatic
Span adjustment ±5%
Model "AN-AC"
Signal ranges 199.9 V ac 650 V ac
Bias current 1 pA 1 pA
Overvoltage protection 650 V ac 650 V ac
Resolution 100 mV 1 V ac
Input resistance 1 MΩ1 MΩ
Configuration Half wave average, RMS calibrated
Zero Automatic
Frequency 47 to 1000 Hz
1

2
2.2 ACCURACY AT 25°C
Warmup to rated accuracy 10 minutes
Model "AN"
Maximum error ±0.05% or reading °1 count
Span to tempco ±0.01% of reading/°C
Step response 1 second
Model "AN-AC" (10% to 100% of full-scale range)
Maximum error (actual reading)
20.0 to 199.9 V range ±0.003%FS (R-110 V) / V ±1 counts
20.0 to 650.V range ±0.003%FS (R-220 V) / V ±1 counts
Span to tempco ±0.01% of reading / °C
Step response 1 second
2.3 NOISE REJECTION
NMR 56 dB at 50/60 Hz
CMR, SIG LO to SIG GND 80 dB, DC to 60 Hz
CMV, SIG LO to SIG GND ±1.0 Vp
CMR, AC GND to SIG GND 120 dB, DC to 60 Hz
CMV, AC GND to SIG GND 1500 Vp per HV test; 354 Vp per IEC spacing
2.4 ANALOGTO DIGITAL CONVERSION
Technique Dual-slope, average-value
Read rate 2.5/second
Input integration period 100 milliseconds
2.5 3WIRE RATIO REFERENCE
Model "AN"
Analog input range ±200 mV, ±2 V, ±20 V, ±200 V
Reference voltage +0.05 to +0.2 V +0.5 to 2.0 V
Load on reference 30.6 ohms 65.3 ohms
Accuracy 99.9%R 99.9%R
2.6 DISPLAY
Type 7 segment, red LED; 14.2 mm (0.56 in)
Symbols
Model "AN" -1.8.8.8
Model "AN AC" 1.8.8.8
Decimal points 3 position programmable internally or at connector
Overrange indication 3 least significant digits blank

3
2.7 DIGITAL SIGNALS (Referenced to SIG GND)
Logical 0 0 to +1.4 V
Logical 1 +3.7 V to +5.0 V
Display HOLD 1 = latched reading
LAMP TEST 1 = display of -1888
Output voltage +4.7 V dc ±5% at 10 mA max
-4.6 V dc ±5% at 10 mA max
2.8 POWER
AC input voltage 115 or 230 V ac ±15%
AC frequency range 49 to 440 Hz
DC input voltage 9 to 32 V dc, isolated to 300 Vp
26 to 56 V dc, isolated to 300 Vp
Power consumption 2.4 W (nominal)
2.9 ENVIRONMENTAL
Operating temperature 0 to +60°C
Storage temperature -40 to +85°C
Relative humidity 95% at +40°C (non-condensing)
2.10 MECHANICAL
Bezel 96 x 48 x 6.1 mm (3.78 x 1.89 x 0.24 in)
Depth behind bezel,
with connector 99 mm (3.90 in)
Panel cutout 92 x 45 mm (3.62 x 1.77 in)
Weight 400 g (14 oz)
Case material 94V-O UL rated polycarbonate
D1 connector: 18 pin, double row, 3.96 mm (0.156 in) pin spacing
D4 connector: Screw terminal barrier strip for signal and power
(removes these inputs from D1)

4
3.0 MECHANICAL ASSEMBLY AND INSTALLATION
3.1 PANEL MOUNTING
Figure 3-1 DIN Case Dimensions
1. Remove the main board edge connector (J1) if installed.
2. Use a #8 Phillips-head screwdriver to loosen the two screws on the rear of
the case until you can rotate the two clamp rings. Loosen the screws enough
to allow for the panel thickness.
3. Slide the two slide retainers towards the rear of the unit and remove them.
4. Observe the case dimensions previously shown. From the front of the panel,
insert the meter into the panel cutout.
5. Slide the slide retainers back onto the case and push up tightly against the
rear of the panel.
6. Rotate the clamp rings back into their original position and tighten until the
case is held in place. Do not overtighten.
7. Reinstall any connectors that were removed

5
3.1 PANEL MOUNTING (continued)
WARNING: High voltage is present when using model "AN-AC" with the
650V AC option.
Figure 3-2 ExplodedView