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Ministing Single Channel Low-Cost Instrument

The MiniSting is a low cost resistivity & IP meter especially designed for small resistivity jobs like electrical grounding-grid testing, soil resistivity test using the Wenner four electrode method, survey for corrosion control, electrical surveys with the four electrode method (vertical electrical sounding or profiling). This instrument is also recommended for educational purposes.
The MiniSting is pre-programmed for Wenner, Schlumberger, dipole-dipole, pole-dipole, pole-pole, mise-a-la-masse, SP, resistance and azimuthal surveys in the manual measurement mode.

The MiniSting can also be used with the Swift automatic smart electrode system or with Switch boxes (switching 28, 56, 84 or 98 electrodes) and passive electrodes or our down hole electrode cables. The MiniSting/Swift can perform automatic surveys with any electrode array and can also also perform surveys controlled by a computer.
Recorded data is saved in the internal memory and at a convenient time downloaded to a computer for further processing. Our utility sofware "the Administrator" is included with the MiniSting as well as a serial download cable. The Administrator software is used for data down-load and command file up-load.
Resistivity imaging data and bore hole to bore hole data can be read directly by our EarthImager software to produce brilliant tomographic images in color.
The MiniSting has a built in re-chargeable NiMH battery with power sufficient for one day of manual surveying. The instrument is delivered with a battery charger. During automatic surveys when the instrument uses a lot of power, it is normally powered by an external 12 V battery.

Key Benefits

  • Low cost instrument
  • Compact size with built in battery
  • Rugged construction
  • Easy to use menu driven system
  • Versatile instrument for different survey configurations

TECHNICAL SPECIFICATION:

Measurement modesApparent resistivity, resistance, voltage (SP), induced polarization (IP), battery voltage
Measurement range400 kohms to 0.1 milliohms (resistance)
0-500 V full scale voltage autoranging.
Measuring resolutionMax 30 nV, depends on voltage level
Screen resolution4 digits in engineering notation.
Output current1-2-5-10-20-50-100-200-500 mA.
Output voltageThe user can switch between high and low voltage limit for the transmitter (800 Vp-p or 320 Vp-p voltage limit). Actual electrode voltage depends on transmitted current and ground resistivity.
Input gain rangingAutomatic, always uses full dynamic range of receiver.
Input impedance>20 Mohms
Input voltageMax 500 V
SP compensationAutomatic cancellation of SP voltages during resistivity measurement. Constant and linearly varying SP cancels completely.
Type of IP measurementTime domain chargeabilitiy (M), six time slots measured and stored in memory
IP current transmissionON+, OFF, ON-, OFF
IP cycle times1 s, 2 s, 4 s and 8 s
Measure cyclesRunning average of measurement displayed after each cycle. Automatic cycle stops when reading errors fall below user set limit or user set max cycles are done.
Cycle timesBasic measure time is 1.2, 3.6, 7.2 or 14.4 s as selected by user via keyboard. autoranging and commutation adds about 1.4 s.
Signal processingContinuous averaging after each complete cycle. Noise errors calculated and displayed as percentage of reading.Reading displayed as resistance (dV/I) and apparent resistivity (ohmm or ohmft). Resistivity is calculated using user entered electrode distances.
Noise suppressionBetter than 100 dB at f>20 Hz
Better than 120 dB at power line frequencies (16 2/3, 20, 50 & 60 Hz)
Total accuracyBetter than 1% of reading in most cases (lab measurements). Field measurement accuracy depends on ground noise and resistivity. Instrument will calculate and display running estimate of measuring accuracy.
System calibrationCalibration is done digitally by the microprocessor based on correction values stored in memory.
Supported configurationsResistance, Schlumberger, Wenner, dipole-dipole, pole-dipole, pole-pole, azimuthal, mise-a-la-masse, SP (absolute) and SP (gradient).
Data storageFull resolution reading average and error are stored along with user entered coordinates and time of day for each measurement. Storage is effected automatically.
Memory capacityMore than 3000 measuring points can be stored in internal memory.
Data transmissionRS-232C channel included to dump data from instrument to PC on user command.
Automatic multi-electrodesThe MiniSting is designed to run dipole-dipole surveys completely automatic with the optional Swift Dual Mode Automatic Multi-electrode system (patent 6,404,203). The MiniSting/Swift can run any other array (Schlumberger, Wenner etc.) by using special user programmed command files. These files are created in an MS DOS type computer and downloaded to the MiniSting RAM memory and are later recalled and run in the field. Therefore there is no need for a fragile computer in the field.
User controls20 key tactile, weather proof keyboard with numeric entry keys and function keys.
On/Off switch
Measure button, integrated within main keyboard.
LCD night light switch (push to illuminate).
DisplayAlphanumeric LCD display (4 lines x 20 characters) with night light.
Connectors4 banana plug, pole screws for current and potential electrodes. 10-pole KPT connector for external power, RS-232C and synchronization connections.
Power supply, field12/24 V DC external power, connector on front panel.
Maximum power output is increased when using 24V supply.
Power supply12V, 4.5 Ah NiMH built-in rechargeable battery. External power connector on front panel, the instrument automatically selects external battery if present.
Operating timeDepends on conditions, internal circuitry in auto mode adjusts current to save energy. At 20 mA output current and 10 kW electrode resistance more than 2000 cycles are available from a fully charged battery pack.
Battery chargerDual stage charger with switchable input (115/230 V AC @ 50/60 cycles)
Weight6.6 kg (14.5 lb.)
DimensionsWidth 255 mm (10"), length 255 mm (10") and height 123 mm (5").
 
 
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