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User’s Guide
™
®
http://www.omega.com
e-mail: info@omega.com
DP3001
DIGITAL PANEL VOLTMETER
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TABLE OF CONTENTS SAFETY CONSIDERATIONS ......................................................................................... iii 1.0 GENERAL INFORMATION ........................................................................................ 1 2.0 SPECIFICATIONS ..................................................................................................... 1 2.1 Analog Input ......................................................................................................... 1
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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 ...............................................................................
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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
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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 read
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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
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2.10 MECHANICAL Bezel 96 x 48 x 5.1 mm (3.78 x 1.89 x 0.20 in) Depth behind bezel 104 mm (4.09 in) (with connector) Panel cutout 92 x 45 mm (3.62 x 1.77 in) Weight 400 g (14 oz) Case material 94V-0 UL-rated polycarbonate D1 connector option PCB edge connector with a double row of (non-CE) 18-pins, 3.96 mm (0.156 in) spacing between pins D4 connector option Barrier terminal strip with six #6 screw (CE) connections for signal and power (removes these inputs from D1) 3.0 ME
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TAB I.D. LABEL CASE, TOP SLIDE SCREW (2) SLIDE CLAMP (2) PARALLEL BCD OUTPUT BOARD (F2N OPTION) SLIDE RETAINER (2) TERMINAL BLOCK COVER SIGNAL INPUT POWER INPUT LENS MAIN BOARD SPAN ADJUST CASE, BOTTOM 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 t
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4.0 POWER AND SIGNAL AC versions of the voltmeter are factory-set for 115 Vac in the USA and 230 Vac in Europe (using C1 option) ±15% operation. DC versions are preset for 9-32 Vdc or 26-56 Vdc operation. It is not possible to change the meter from 9-32 Vdc to 26-56 Vdc or vice versa. Different static inverters are installed by the factory. Refer to Safety Considerations prior to connecting power. 4.1 CHANGING OPERATING VOLTAGE Remove power lines from the meter, then remove the meter from t
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(D4) (D1) Figure 4.2 Rear Terminal Hookups Model Power Signal A High 17 High D1 Connector 2 Low 16 Low C Earth Ground T Analog Ground AC 1 High 6 High D4 Connector 2 Low 5 Low 3 Earth Ground 4 Analog Ground 2 + DC 17 High D1 Connector C - DC (return) 16 Low T Analog Ground DC 2 + DC 6 High D4 Connector 3 - DC (return) 5 Low 4 Analog Ground Wire Color for AC Power USA Other (High) Black Brown (Low) White Blue (Ground) Green Green 6
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4.3 MAIN BOARD PIN ASSIGNMENTS (J1 Card Edge) Left to right, looking at rear of case P1 Connection Standard A Spare (E16) 1 No connection B No connection 2 Spare (E18) C Spare (E19) 3 No connection D No connection 4 No connection E Spare (E43) 5 No connection F 1999.9 (DP4) 6 Spare (E24) H 199.99 (DP3) 7 Spare (E23) J 19.999 (DP2) 8 Spare (E22) K 1.9999 (DP1) 9 Spare (E25) L Decimal point select 10 Spare (E26) M Spare (E27) 11 –4.6 Vdc power output N Spare (E29) 12 +4.7 Vdc power
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4.4 SIGNAL INPUTS RATIO: The reference input allows an external voltage to be used as the reference source for conversion. In this mode, the meter reads the ratio of the signal voltage to the reference voltage rather than the true value of the input. Signal Voltage Reading in Counts = x 10000 Reference Voltage On the 20 V and 200 V ranges, the signal voltage must be scaled by 1/10 and 1/100, respectively. For all ranges, the standard reference input impedance ratio is 80 ohm. For 10
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5.0 CONFIGURATION Select the desired configurations from the following charts. Install jumpers and open/close solder switches as indicated. Remove all push-on jumpers not used. 5.1 DECIMAL POINT SELECTION Figure 5.1 Display Board Jumper Locations Alternate decimal point configuration Decimal Point S1 using main board connector J1. 1.9999 A Connect K to L 19.999 B Connect J to L 199.99 C Connect H to L 1999.9 D Connect F to L 9
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5.2 VOLTAGE RANGE SELECTION Figure 5.2 Main Board Jumper Locations Solder Switches* Push-on Jumpers Wire Jumper Input Configuration Open Close S2 S4 W10 2 Vdc J, L H, I, K - - Install 20 Vdc J, L H, I, K A B Remove 200 Vdc J, L H, I, K A C Remove *Refer to Figure 5.3. S3-A is used for signal connections. Refer to Section 4 for more information. 10
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Figure 5.3 Solder Switch Locations Solder switch F is used for reference input impedance ratio. Refer to Section 4 for more information. 6.0 CALIBRATION This unit was factory-calibrated with a precision voltage source. Frequent calibration is not necessary due to the stability and internal accuracy. If calibration is needed, use the following procedure. 1. Remove the front lens. Insert a blade screwdriver under the notch at the bottom of the lens and gently pry it off. 2. Short the input si
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7.0 DRAWINGS Figure 7.1 Assembly Diagram, Main and Display Board 12
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8.0 DUAL-SLOPE CONVERSION At the beginning of a conversion, the voltage across C is zero. The signal is int then applied to the integrator and the voltage across C rises by the formula: int T1 E = Esig R C Cint int int At the end of a fixed period of 10000 counts, T1, the counters are reset to 00000. The signal input is turned off and a stable reference voltage of the opposite polarity is now applied to the input. Since the reference voltage is constant, the slope, in volts/sec, dur
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NOTES ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ____________________
