Miller 400D

When combined with appropriate electrodes (pins) and test leads, the MILLER-400D can be used to measure earth resistance with the push of a button. There is no need to adjust dials or select ranges; the MILLER-400D automatically provides a directresistance reading.

In addition to taking (and recording) readings manually (see Section 2), a WPAN-enabled computer (PDA, laptop etc.) can be programmed to acquire resistance readings directly from the Miller 400D, since the resistance meter has a built-in WPAN interface (see Section 3). In the latter case, the PDA or PC, which is in control of the WPAN link, commands the Miller 400D to take a reading and the resistance value is sent automatically to the PDA or PC.

• No need to select ranges or adjust dials – the Miller 400D provides a direct read-out of resistance with the push of a button
• WPAN interface allows optional data-logging via a WPAN - enabled PC (or PDA)**
• Rugged, hard plastic case - safe to use on wet ground
• Resistance measurement range from 0.01Ω to 10 MΩ (auto-ranging)
• 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 82.2 Hz (the unit's operating frequency)
• Runs on a set of replaceable D-Cell Industrial 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.

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.

• 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 WPAN - 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 is 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