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Resistance Meters

Miller 400D
Digital Resistance Meter

Cat. #44550
Price $1,943.00

Resistance readings with the push of a button

Integrates with Bluetooth-enabled PCs and PDAs for wireless data acquisition

Soil resistivity survey software included free-of-charge

  • No need to select ranges or adjust dials – the Miller 400D provides a direct read-out of resistance with the push of a button
  • Bluetooth interface allows optional data-logging via a Bluetooth-enabled PC (or PDA)**
  • Rugged, hard plastic case - safe to use on wet ground – IP67 rating for dust and water intrusion
  • Resistance measurement range from 0.01Ω to 10MΩ (auto-ranging)
  • Accuracy:
    0.01Ω to 1MΩ range: ±1.6% ±1LS Display Digit ±0.01Ω
    1MΩ to 10MΩ range*: ±5% ±1LS Display Digit
  • High resolution digital display
  • Resistance measurements are unaffected by any stray interference signals that may be present in the earth during readings, due to the use of narrow band-pass filters centered at 82.2Hz (the unit’s operating frequency)
  • Runs on a set of replaceable D-cell alkaline batteries...no need to periodically recharge the unit or to plug it into a power source
  • Performs 10,000 single readings on a fresh set of batteries
  • Storage temperature range (with batteries installed): -40°C to 50°C (-40°F to 122°F)
    Operating temperature range: -20°C to 54°C (-4°F to 129°F)
  • Dimensions: 12 W x 10.5 L x 5.75 H (30.5cm x 26.7cm x 14.6cm)
  • Weight: 8.6 lbs (3.9kg)
  • Integrates with Universal Rectifiers’ Soil Depth Selector/Multi-Pin Cable Harness System (please see Integration with Universal Rectifiers’ Cable Harness)

* For load resistances greater than 1MΩ, in addition to internal meter errors, errors associated with test lead proximity can also be significant (please 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.

** Data-logging Capability: The Miller 400D Resistance Meter is supplied with an “over-the pipe” soil resistivity survey program, known as “ProCP Soil Resistivity”, based on the 4-Pin Wenner Methodology.


Miller 400D with Bluetooth enabled PDA*
*PDA sold separately

ProCP Soil Resistivity Application

Software Features & Benefits:

  • Errors associated with writing down resistance meter readings and subsequently calculating soil resistivity values based on pin spacings are eliminated using the ProCP Soil Resistivity program in conjunction with the Miller 400D Resistance Meter.
  • M. C. Miller’s ProCP Soil Resistivity application can be run on “off-the-shelf” PocketPC hardware (Windows Mobile 5.0 or higher) or on a laptop PC. Hardware must be Bluetooth-enabled.
  • Reading locations are represented by user-entered station numbers and readings are automatically position and data/time stamped in cases where a GPS receiver is integrated with the user’s handheld unit.
  • Data can be stored for up to 4 electrode (pin) spacings per reading location.Pin spacing values are user-entered in “feet” or in “meters”.
  • Resistance data directly acquired from the Miller 400D are converted to soil resistivity values (expressed in ohm.cm units) for each selected pin spacing value. Measured resistance and calculated resistivity values are both stored per reading.
  • Survey data are stored in XML files for easy reading by other applications, including ProActive, M. C. Miller’s Pipeline Integrity Data Management application. ProActive users are able to easily integrate soil resistivity survey data with other “over-the-pipe” survey data for enhanced data analysis. A conversion to XLS file format (Excel Spreadsheet) option is also included.

More Information: Miller 400D comparison study

Miller 400D User’s Manual