• Back to Instrument Rentals

• Go Back

IPR-12 Time Domain Induced Polarization/Resistivity Receiver

The IPR-12 Time Domain IP/Resistivity Receiver is principally used in exploration for precious and base metal mineral deposits. In addition, it is used in geoelectrical surveying for groundwater or geothermal resources, often to great depths.

For these latter targets, the induced polarization measurements may be as useful as the high accuracy resistivity results since it often happens that geological materials have IP contrasts when resistivity differences are absent.

Due to its integrated, lightweight, microprocessor-based design and its large, 16 line display screen, the IPR-12 is a remarkably powerful, yet easy-to-use instrument. A wide variety of alphanumeric and graphical information can be viewed by the operator during and after the taking of readings. Signals from up to eight potential dipoles can be measured simultaneously and recorded in solid-state memory along with automatically calculated parameters. Later, data can be output to a printer or a PC (direct or via modem) for processing into profiles and maps.

The IPR-12 is compatible with Scintrex IPC and TSQ Transmitters, or others which output square waves with equal on and off periods and polarity changes at each half cycle. The IPR-12 measures the primary voltage (Vp), self potential (SP) and time domain induced polarization (Mi) characteristics of the received waveform. Resistivity, statistical and Cole-Cole parameters are calculated and recorded in memory with the measured data and time.

Scintrex has been active in induced polarization research, development, manufacturing, consulting and surveying for over thirty years. We offer a full range of instrumentation, accessories and training.

Speed Up Surveys
The IPR-12 saves you time and money in carrying out field surveys. Its capacity to measure up to eight dipoles simultaneously is far more efficient than older receivers measuring a single dipole. This advantage is particularly valuable in drillhole logging where electrode movement time is minimal. The built-in, solid-state memory records all information associated with a reading, dispensing with the need for any hand written notes. PC compatibility means rapid electronic transfer of data from the receiver to a computer for rapid data processing. Taking a reading is simple and fast. Only a few keystrokes are virtually needed since the IPR-12 features automatic circuit checks, SP blackout and gain setting.

High Quality Data
Once of the most important features of the IPR-12 in permitting high quality data to be acquired. The large display screen allows the operator easy real time access to graphic and alphanumeric displays of instrument status and measured data. The IPR-12 ensures that the operator obtains accurate data from field work. The number and relative widths of the IP decay curve windows have been carefully chosen to yield the transient information required for proper interpretation of spectral IP data. Timings are selectable to permit a very wide range of responses to be measured.

The IPR-12 stacks the information for each cycle and calculates a running average for Vp, SP and each transient window. This enhancement is equivalent to a noise decrease of $C3N or a transmitter power increase of N where N is the number of values averaged. Since values are measured each few seconds, it does not take long for this signal enhancement technique to have great effects.

The automatic SP program bucks out and corrects completely for linear SP drift. Data are also kept noise free by radio frequency (RF) filters, low pass filters and statistical spheric noise spike rejection. To prevent mistriggering, the IPR-12 does not accept trigger-line signals at inappropriate times.

Eight Dipoles Simultaneously The analog input section of the IPR-12 contains eight identical differential inputs to accept signals from up to eight individual potential dipoles. Any dipole can be disabled. The amplified analog signals are converted to digital form by a high resolution A/D converter and recorded with other pertinent information identifying each group of dipoles.

Large Backlit Display The 16 line by 40 character backlit SuperTwist Liquid Crystal Display (LCD) enhances the operator's understanding of the status and the accuracy of the measured data. Any one of thirteen different display screens are used for entering information, monitoring the progress of a reading and checking data before and after recording. An LCD heater is provided for low temperature operations.

Keyboard has seventeen large keys control the instrument and permit input of Alphanumeric information.

Solid State Memory All instrument parameters as well as entered notes, and measured and calculated quantities are stored in the large capacity, fail-safe memory.

Memory Recall Any observation recorded in memory can be recalled, by simple keyboard entry, for inspection on the display.

Printed Data Listings A simple digital printer can be connected to the IPR-12 to print out listings of data recorded in memory.

PC Compatibility The IPR-12 usues an RS-232C, 7 or 8 bit ASCII high baud rate interface, compatibile with most lap-tops or PC's. This permits data to be dumped on a line-by-line basis or all at once from the receiver's memory for archiving or processing.

Spectral Quality IP Depending on receive time, 10 to 14 windows are measured simultaneously for each dipole.

Selectable total receive times are 1, 2, 4, 8, 16 and 32 seconds. After current is shut off, there is a delay of t milliseconds. Then, the width of each window in the seven following pAirs of windows is respectively: t, 2t, 4t, 8t, 14t, 23t and 36t. This format provides a high density of information at early times where the decay curve is steepest.

Variable Chargeability Summing By keyboard selection you can choose an additional summed transient window. This value, Mx, is recorded in memory along with the value for each of the measured transient windows. Summing can be done for the purpose of obtaining a parameter close to that measured with earlier receivers. The width of the Mx window ranges upwards from 10 milliseconds in 10 millisecond steps.

Signal Enhancement Primary voltage, self potential and individual windows are continuously averaged and the display is updated every cycle so the operator is fully aware of signal improvement.

Calculates Cole-Cole Parameters The IPR-12 calculates the Cole-Cole parameters; true chargeability (M) and time constant (Tau) for a fixed C of 0.25. These parameters, which are recorded in memory to assist interpretation by distinguishing between different chargeable sources, based mainly on textural differences. This feature is not available if programmable windows are selected.

Noise Rejection Individual samples contaminated by noise can be automatically rejected.

Statistical Parameters The IPR-12 calculates statistical error parameters for Mx. The RMS error of the deviation between the measured data and best fit of the Cole-Cole calculation is also derived.

Selectable Reading Termination By keyboard selection the receiver can be set up to terminate readings by either a manual key press or when a preset number of cycles have been measured.

Normalizes for Time and Vp The value recorded for each M window is in millivolt/volt, that is to say that normalization is automatically done for the width of each window and for the primary voltage. Vp is also normalized for time of integration.

Automatic Resistivity Calculations The IPR-12 calculates the geometrical (K) factors for standard arrays shown in the Info display based on electrode positions given in the Locations display. This feature is particulatly helpful for arrays like the Gradient of Schlumberger in which the K-Factors change for every station. Then, using measured primary voltages with operator entered current values, the receiver calculates and records apparent resistivity values.

Automatic Vp Self Ranging There is no manual adjustment for different primary voltages since the IPR-12 automatically adjusts the gain of its signal conditioning amplifiers for any Vp signal in the range of 50 microvolts to 14 volts full scale.