H-4385D
数字电阻率计
数字 电阻率 Meter provides soil resistivity readings at the push of a button
H-4385
模拟电阻率计
The 电阻率 Meter is used to measure resistivity of soil in-situ using 2, 3, or 4 electrodes
H-4388
电阻率 Test Reel with Soil Pins
Four pin, test reel set for attaining 1-20 ft. 深度测量
H-4385.1
电阻率 Meter Test Kit
The Soil resistivity test kit is designed to conveniently store and carry all that is necessary to perform at test
h - 4386 sm
土壤的盒子, Small, 80ml capacity
Quick and accurate measurement of resistivity of a soil or water sample, field or laboratory
H-4386.XX
土壤的盒子
F或使用 with 电阻率 Meters
H-4388.1
土钉(电极)
Set of four Soil Pins f或使用 with 电阻率 Meters
H-4385.5
土壤缸
The 土壤缸 can be used for either of the 2-electrode methods— ASTM G187 or AASHTO T-288
H-4387
土壤箱引线,一套4个
Set of four Lead wires f或使用 with 电阻率 Meters
电阻率
When combined with the appropriate electrodes (pins) and test leads, these resistivity meters can be used to measure earth resistance or the resistance-to earth of a buried electrode, such as a ground rod or an anode, 例如. Depending on the application, 4-Electrode, 3-Electrode or 2-Electrode, these resistivity meters 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应用程序
- 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应用程序
• The resistance-to-earth of a buried electrode, such as a ground rod, or an anode, 例如
3-Electrode应用程序
• The resistance between two buried electrodes, such as two ground rods, or two anodes
2-Electrode应用程序
The current source in these meters, which supplies current between the C1 and C2 terminals (with a load applied), is a 12V(rms) crystal-controlled 97Hz square wave oscillator and the voltmeter inside the unit, which senses the potential difference (voltage drop) appearing across the P1 and P2 terminals, employs a very narrow band-pass filter centered at 97Hz.
What this means is that resistance measurements taken by the meters are unaffected by any stray interference signals (having frequencies other than 97Hz) that may be present in the earth during a measurement. These resistivity meters have a resistance measurement range from 0.01欧姆(0.01Ω)到1.1兆赫(1兆赫.1MΩ) that is achieved by means of a set of 8 range settings and a system of internal “standard” resistors. External resistances (resistance values under test) are compared against the internal “standards, via a null balancing system, resulting in a determination of the external resistance values.