M.C. Miller 400D Digital Resistance Meter Miller
The Miller 400D is a high end resistance meter for soil resistivity measurements. Encased in a hard plastic shell with an IP67 rating it will withstand dust and water intrusion. With the push of a button you get direct readouts of resistance. Also has a Bluetooth interface for optional data logging to a Bluetooth enabled PC or PDA.
Features
The Miller 400D has the following features:
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High Resolution Digital Display: Get clear and accurate resistance readings.
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Auto Ranging Measurement: 0.01Ω to 10MΩ, auto scales for each measurement.
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Narrow Band-Pass Filters: 82.2Hz centered, minimizes stray signals.
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Data Analysis: ProCP Soil Resistivity program converts resistance readings from the Miller 400D into soil resistivity.
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Data Logging: Store and analyze your survey data.
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Operating Temperature Range: -20°C to 50°C (-4°F to 122°F)
All new M.C.Miller meters come with Calibration Certificate.
NEW: A configuration application is now available for Android™ tablets. It’s on the CD that comes with the 400D or if you already have a 400D you can download it.
Resistance Readings with the Push of a Button. Error-free Data-logging Option.
Features
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No need to select ranges or adjust dials – get resistance readings with the push of a button
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Wireless interface for optional data-logging to a Wireless PC (or PDA)*
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Hard plastic case – safe to use on wet ground
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0.01Ω to 10MΩ (auto ranging)
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High resolution digital display
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Resistance readings are not affected by any stray signals in the earth during readings due to the narrow band-pass filters centered at 82.2Hz (the units operating frequency)
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Runs on D-Cell Industrial Alkaline Batteries. No recharging or plugging into a power source required
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10,000 single readings on a set of fresh batteries
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Integrates with Universal Rectifiers’ Soil Depth Selector/Multi-Pin Cable Harness System (see Integration with Universal Rectifiers’ Cable Harness)
Data Logging:
The Miller 400D comes with an “over the pipe” soil resistivity survey program, ProCP Soil Resistivity, based on the 4-Pin Wenner Methodology.
Software Features & Benefits
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Eliminates errors associated with writing down ac resistance meter readings and then calculating soil resistivity values based on pin spacings using the ProCP Soil Resistivity program with the Miller 400D
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M.C.Miller’s ProCP Soil Resistivity can run on “off-the-shelf” PocketPC hardware (Windows Mobile 5.0 or higher) or on a laptop PC. Hardware must be Wireless
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Station numbers are user entered and readings are auto-position and data/time stamped if a GPS receiver is integrated with the user’s handheld unit
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Data can be stored for up to 4 electrode (pin) spacings per reading location. Pin spacing values are user entered in “feet” or “meters”
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Resistance data from the Miller 400D is converted to soil resistivity values (ohm.cm) for each selected pin spacing value. Measured resistance and calculated resistivity values are both stored per reading
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Data is stored in XML files for easy import into other applications including ProActive, M.C.Miller’s Pipeline Integrity Data Management application. ProActive users can easily integrate soil resistivity survey data with other “over the pipe” survey data. A conversion to XLS file format (Excel Spreadsheet) is also included.
See Documents below
Specifications and Calculated Resistivity Values
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Storage temperature range (with batteries installed): -40°C to 50°C (-40°F to 122°F)
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Operating temperature range: -20°C to 54°C (-4°F to 129°F)
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Width: 12.0 inches (30.5 cm)
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Height: 5.75 inches (14.6 cm)
Accuracy:
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0.01Ω to 1MΩ range ±1.6% ±1LS Display Digit ±0.01Ω
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1MΩ to 10MΩ range* ±5% ±1LS Display Digit
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For load resistances greater than 1MΩ, in addition to internal meter errors, errors associated with test lead proximity can also be significant (see Influence of test lead proximity on the accuracy of AC resistance meter readings). When test leads are in close (physical) contact with each other, mutual capacitance and mutual inductance effects can impact the current and voltage, respectively (and hence the resultant resistance value). In such cases, the load (appearing across the input terminals of the meter) is not purely resistive, but, has reactive components as well. The solution to this issue is to make sure that the test leads are physically separated from each other in cases where the soil resistance is greater than 1MΩ.
Uses
The Miller 400D is used for:
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Soil Resistivity Surveys for Cathodic Protection Systems: To verify cathodic protection systems are working.
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Soil Resistivity Measurements for Grounding Systems: To design and maintain grounding systems in electrical installations.
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Resistance Measurements for Electrical Infrastructure: To evaluate electrical infrastructure components.
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Data Analysis and Reporting for Soil Resistivity Survey Data: To analyze and report survey data.
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ProCP Soil Resistivity Program: Uses advanced software to give more detail and accurate soil resistivity values.
By including these sections, we will cover the Miller 400D Digital Resistance Meter in full, features, benefits and uses in soil resistivity measurement.
Documents and Data Logging
Manuals:
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MAN170 Miller 400D User Manual
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Miller 400D Android Tablet Connectivity
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Fall of Potential Method
Info:
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ASTM G57 and AASHTO T-288 Standard Methods
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Universal Rectifiers Cable Harness
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400D Comparison Study
Brochures:
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Resistance Meters Brochure
Downloads and Temperature Range
Android™: 400D apk Configuration Utility
MS Windows™: 400D Setup
400D Configuration