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3-1-2 Digit ohmmeter
DP302-O
PLACE ORDER - 1999 Count Display Span
- 19.99 Ω to 19.99 kΩ Ranges
- 2-, 3- or 4-Wire Connection
- 120 dB CMR, 70 dB NMR
- 1 mV/deg Count Output
- Bright, 14 mm (0.56") LED Display
- Display Hold and Test
- 115/230 Vac Power
- EMI/RFI Filter for AC Power
- Screw-Terminal Barrier Strip
- Short 104 mm (4.1") Deep 1/8 DIN Case
Options - Isolated 9 to 32 Vdc or 26 to 56 Vdc Power
- NEMA 4 (IP65) Splash-Proof Lens Cover
Description
Description
The DP302-O is a low-cost 3-1/2 digit (1999-count)resistance meter with readout directly in ohms. Fourranges are jumper-selectable: 19.99 Ω, 199.9 Ω,1.999 kΩ, 19.99 kΩ. It is complete with low-levelcurrent excitation and open-resistance indication.The current source is tied to the reference of the A/Dconverter for true ratiometric operation and immunityto changes in line voltage.
STANDARD FEATURES
Electrical features include linearized analog output of1 mV per count, which is ideal for driving a strip-chartrecorder. Mechanical features include a bright14 mm (0.56") LED display, a screw-terminal barrierstrip for signal and power, and a compact 1/8 DINcase that requires a depth of less than 104 mm (4.1")behind the bezel.
OPTIONS
Options are isolated 9 to 32 Vdc or 26 to 56 Vdcpower, a PCB edge connector for display control andoutput of +4.7 Vdc and -4.7Vdc, and a splash-prooflens cover which meets NEMA 4 (IP65) requirements.
SPECIFICATIONS
Noise Rejection
NMR: 70 dB, 50/60 Hz
CMR, ANA GND to PWR GND: 120 dB to 60 Hz
CMV, ANA GND to PWR GND: 1500 Vp per HV test, 354 Vp per IEC spacing
Power
AC Voltages: 115 or 230 Vac, ±15%
AC Frequency: 49 to 440 Hz
DC Voltages: 9 to 32 Vdc, isolated to 300 Vp; 26 to 56 Vdc, isolated to 300 Vp
Power Consumption: 3.7 W
Output Voltages: 4.7 Vdc and -4.7 Vdc ±5%,10 mA max
Input
Connection: 2-, 3- or 4-wire
Excitation Current: 4 mA or 40 µA
Resistance Break Indication: Meter displays overrange
Overvoltage Protection: 25 Vp
Display
Type: 7-segment, red LED
Height: 14 mm (0.56")
Symbols: 1.8.8.8
Decimal Points: Three positions programmable by jumpers or at connector
Overrange or Break Indication: Three least-significant digits blank
Accuracy At 25°C
Span Tempco: ±0.01% of reading/°C
Zero Tempco: ±1 m/°C (19.99 Ω and 199.9 Ω ranges), ±0.1 Ω/°C (1.999 kΩ and 19.99 kΩ ranges)
Full-Scale Step Response: 1 s
Warmup to Rated Accuracy: 10 min
Environmental
Operating Temperature: 0 to 60°C
Storage Temperature: -40 to 85°C
Relative Humidity: 95% at 40°C (non-condensing)
Analog-to-Digital Conversion
Technique: Dual-slope, average value
Signal Integration Period: 100 ms
Read Rate: 2.5/s
Analog Output (Linearized)
Voltage: 1 mV/count
Calibration Error: Same as given under accuracy
Current: 1 mA maximum
Source Resistance: 68 Ω
Digital Inputs
Level: TTL or 5V CMOS compatible
Mechanical
Bezel: 96 W x 48 H x 5.1 mm D (3.78 x 1.89 x 0.20")
Depth Behind Bezel: 104 mm (4.09")
Panel Cutout: 92 W x 45 mm H (3.62 x 1.77")
Weight: 15 oz (425 g)
Case Material: 94 V-0 UL-rated polycarbonate Anemometer | Automation | Accelerometers | Calibrator | Cartridge Heaters | Chart Recorders | Cryogenics | Custom Pressure Transducers | Data Loggers | Data Acquisition | Dial Thermometers | Fiber Optics | Fiber Optic Temperature Measurement | Flexible Heaters | Flow Meters | Glass Bulb Thermometers | Grippers | Heaters | Humidity Measurement | Integrated Circuit Sensors | Immersion Heaters | Infrared Thermometers | Level Measurement | Load Cells | M12 Temperature Connectors | Magnetic Flow Meter | Panel Meter | PID Controllers | pH meter | Pressure Gauges | Pressure Transducers | Pressure Transmitters | Rotameters | RTD | Remote Process Monitoring | Sanitary Sensors | Signal Conditioners | Stepper Motors | Strain Gages | Strip Heaters | Temperature Controllers | Temperature Labels | Temperature Measurement | Temperature Sensor Manufacturing | Temperature Sensors | Temperature Transmitters | Thermal Imagers | Thermistors | Thermocouple | Thermocouple Wire | Thermowell | Ultrasonic Flow Meters | Vortex Flow Meter | Wireless Sensors
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