When combined with appropriate electrodes (pins) and test leads, the H-4385D 电阻率 meter can be used to measure earth resistance with the push of a button. There is no need to adjust dials or select ranges; the H-4385D 电阻率 Meter automatically provides a direct resistance reading.
In addition to taking (and recording) readings manually, a wireless computer (PDA, laptop etc.) can be programmed to acquire resistance readings directly from the H-4385D, since the resistance meter has a built-in wireless interface. 在后一种情况下, PDA或PC, which is in control of the wireless link, commands the H-4385D to take a reading and the resistance value is sent automatically to the PDA or PC.
取决于应用程序, 4-Electrode, 3电极或2电极, the MILLER-400D can be used to determine the following:
- The average earth resistivity to a specific depth (with the application of an appropriate multiplier to convert resistance to resistivity, based on the electrode separation distance) – 4-Electrode Application
- The resistivity of a soil sample, 或液体的, via an electrolyte (soil/liquid) box (with the application of an appropriate multiplier to convert resistance to resistivity, depending on the box geometry) – 4-Electrode Application
- The resistance-to-earth of a buried electrode, 例如接地棒, 或者是阳极, 例如 – 3-Electrode Application
- The resistance between two buried electrodes, 如两根接地棒, or two anodes – 2-Electrode Application
- All H-4385D resistivity meters include a calibration certificate
The H-4385D resistivity meter has a resistance measurement range (with automatic ranging) from 0.01Ω到10MΩ. 在范围内，0.01Ω to 1MΩ, the specified meter accuracy is ±1.6%±1 LS显示数字±0.01Ω and over the range, 1MΩ to 10MΩ, the specified accuracy is ±5% ±1 LS display digit. 注意: For load resistances >1MΩ, in addition to internal meter errors, errors associated with test lead proximity can also be significant. 值得注意的是, 然而, that these accuracy specifications assume a low electrode (pin)/earth contact resistance during the measurement. 在这方面, it is recommended that the electrodes (pins) be firmly driven into the earth (pins cannot be loose) and, 在干燥的土壤中, it is recommended that the soil around the pins be moistened in order that reliable (low resistance) contact be made to the surrounding soil.
The voltage source inside the H-4385 resistivity meter that supplies the current used in the resistance measurement is a 12V(rms) crystal-controlled 82.2Hz square wave oscillator and the internal ammeter and voltmeter use very narrow band-pass filters centered at 82.2Hz. What this means is that resistance measurements are unaffected by any stray interference signals (having frequencies other than 82.2Hz) that may be present in the earth during the measurement.
The H-4385D resistivity meter runs on a set of replaceable D-size alkaline batteries, so there is no requirement to periodically recharge the unit or to plug the unit into a power source. 此外, due to its extremely low power consumption design, H-4385D可以执行10,000单电阻读数, 例如, 换了一套新电池.
NEW: A configuration application is now available for Android™ tablets. It is included on the CD that ships with the H-4385D. If you already own a H-4385D, you can 在此下载应用程式.
MS Windows™ based software can be downloaded here:
h - 4385 d设置:
h - 4385 d配置:
