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Resistivity Meters & Imaging Systems
Resistivity Meters
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Resistivity Monitoring Systems
Resistivity Software

Induced Polarization
IP - Receivers
IP - Transmitters

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Induced Polarization (IP) Systems - Receivers


ELREC 6 Receiver Time/Frequency Domains ELREC 6 Receiver Time/Frequency Domains
Related Information:
ProSys Data Transfer/Utility Software ProSys Data Transfer/Utility Software
ELREC PRO Ten Channel Receiver ELREC PRO Ten Channel Receiver
ELREC T Resistivity/IP Transmitter/Receiver ELREC T Resistivity/IP Transmitter/Receiver


ELREC 6 Receiver Time/Frequency Domains

A six dipole receiver with frequency domain capability. Also offered as time domain only model with 20 IP windows.

ELREC 6 Receiver Time/Frequency Domains
MULTI CHANNEL IP/RESISTIVITY RECEIVER

Features:

  • Six simultaneous dipoles
  • Twenty programmable chargeability windows
  • High accuracy and sensitivity
General:

ELREC 6 is a six dipole Time Domain Induced Polarization/Resistivity Receiver designed for high productivity surveys in mineral and groundwater exploration

ELREC 6 has been designed for being both a user friendly and very sensitive IP/Resistivity receiver.

ELREC 6 is available in two models: the first option includes twenty programmable windows in Time Domain mode, the second provides both ten programmable windows in Time Domain mode as well as the Frequency Domain mode.

Six dipoles:

The six channels of the receiver permit to measure six dipoles simultaneously, which provides a high efficiency in the field.

Twenty programmable windows:

Beside the classical preset logarithmic and arithmetic modes, ELREC 6 also offers up to twenty fully independent programmable windows which the operator can define by himself according to the way he wants to sample the IP decay curve.

Automatic measuring process:

A microprocessor fully controls the synchronization, the gain ranging, the stacking, and the display of the results including the apparent resistivity.

Monitoring display:

During the acquisition, the chargeabilities of the six dipoles can be displayed simultaneously on the LCD display for a global visualization of the readings ; the standard deviations of these chargeabilities can also be displayed simultaneously for a real time monitoring of the quality of the ongoing readings.

Internal memory:

The memory can store up to 2500 readings, each reading including the full set of parameters characterizing the measurements; the date and time of the reading, given by the Real Time Clock of the instrument, are also stored. A serial link permits to transfer the data to a printer or computer.

Remote control:

ELREC 6 can be fully driven by a microcomputer through the serial link for remote operation applications.

Frequency mode:

The frequency effect and the phase shift between the fundamental and the third harmonics may be measured for a Frequency Domain waveform (ON+, ON-), or for a Time Domain waveform (ON+, OFF, ON-, OFF).

Time Domain waveform (ON+, OFF, ON-, OFF).

Field proof instrument:

ELREC 6 operates in a wide range of temperature and humidity. It also features a fiberglass case for increased resistance to field shocks and vibrations.

ELREC 6 Measuring Process:

Elrec 6 measuring process has been optimized to provide the best possible accuracy in real field conditions. Included features are:

Available Electrode Arrays A range of electrode arrays are available, they include Dipole Dipole, Pole Dipole, Pole Pole, Gradient Rectangle, Schlumberger and Wenner Soundings and Profilings, Borehole Electrodes, etc.

Noise Monitoring System A monitor function enables the operator the check the level of noise observed on each dipole before the measurement: the LCD digital voltmeter function displays the raw instantaneous value of potential. In reality, it is possible to digitally observe the presence of a pulse square waveform corresponding to a primary voltage signal and showing the operation of a transmitter nearby. This function is also available during the acquisition of a reading.

Line Check/Ground Resistance: A line check/ground resistance measurement which permits to check that all seven electrodes are properly connected to the receiver.

Low-Pass Filter: A low-pass analog filter which reduces the effect of higher frequency natural and cultural noises (50-60 Hz).

Automatic SP Compensation: The automatic SP compensation includes linear drift correction (up to 1 mV/s) through a digital filter.

Automatic Gain Ranging: automatic gain ranging is applied within a voltage range of +/- 10V.

Automatic Synchronization Process: ELREC 6 automatically synchronizes with the signal through a waveform recognition process ; it also automatically re-synchronizes at each new pulse to avoid errors due to a possible shift in the period of the transmitted signal.

Automatic Digital Stacking: To enhance the signal-to-noise ratio for as long as the operator wants, automatic digital stacking stack to a 250 maximum. During the stacking, the operator can monitor either the instantaneous value (to observe the level of noise), or the cumulative value (to observe the convergence of the average value).

Continuous Quality Test: A continuous quality test procedure, which stops the averaging process when the noise level becomes too high, but keeps the previously stacked data. The averaging procedure starts again when noise decreases. This procedure optimizes the time of data acquisition in very noisy areas.

Resolution After Stacking: A resolution after stacking of 1 V for primary voltage, and of 0.01 mV/V for chargeability, for pointing out low amplitude anomalies. The standard deviations of the chargeability of the six dipoles are displayed during and after the acquisition to give an indication on the noise level.

Normalized chargeability option : The normalized chargeability option refers the chargeability to a standard IP decay curve, and permits to point out any EM coupling effect on the measured signal.

Compatibility: The ELREC 6 is compatible with VIP 3000 , VIP 4000, VIP10000 and with most of time domain IP/Resistivity Transmitters currently available.

Specifications:

  • Input Channels: Six
  • Signal Waveform: Time Domain (ON+, OFF, ON-, OFF) with pulse duration of 0.5, 1, 2, 4, 8 seconds
  • IP Chargeability Windows: Up to twenty arithmetic, logarithmic, or fully program- mable
  • Apparent Resistivity Computation: Average chargeability and standard deviation.
  • Input Impedance: 10 Mohm
  • Input Overvoltage Protection: up to 1000 volts
  • Input Voltage Range: Each dipole: 10V max sum of voltage of dipoles 2 to 6: 15V max
  • Automatic SP Bucking: 10V with linear drift correction up to 1 mV/s
  • Power Line Rejection: 50 to 60 Hz
  • Sampling Rate: 10 ms
  • Common Mode Rejection: 100 dB (for RS = 0)
  • Grounding Resistance: Measurement from 0.1 to 467 Kohm
  • Battery Test: Manual and automatic before each measurement
Primary Voltage:
  • Resolution: 1 V after stacking
  • Accuracy: typical 0.3%
Chargeability:
  • Resolution : 0.01 mV/V
  • Accuracy: typical 0.6%
  • Memory capacity: 2500 readings
  • Data Transfer: RS 232 link for data transfer to microcomputers and printers (300 to 19200 baud rate)
  • Remote Control: through the serial link
Frequency Mode:
  • Signal waveform: (ON+, ON-) or (ON+, OFF, ON-, OFF)
  • Pulse Duration: 1s or 2s
  • Measured Parameters: Frequency effect and relative phase fundamental and third harmonics
  • Resolution: about 0.01% after stacking
Miscellaneous:
  • Dimensions: 31x21x21 cm
  • Weight: 6 kg with dry cells, 8 kg with internal battery
  • Operating temperature: -40C to +70C
  • Power supply: either 12V internal recharge- able battery, or six 1.5V D size dry cells. In both cases, a 12V external battery can also be used.
Standard Components:
    ELREC 6 Console, (Alkaline or Rechargeable Batteries with Charger), external 12V Power Cable, RS-232 Data Transfer Cable with Cross-connectors, Data Transfer Program, Operations Manual and Shipping Case.
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ELREC PRO Ten Channel Receiver

A ten channel IP receiver that measures ten adjacent dipolse simultaneously. Includes 20 fully programmable time slices with graphics display.

ELREC PRO Ten Channel Receiver

ELREC PRO Ten channel IP receiver for mineral exploration

Heritage GeoPhysics is pleased to announce the ELREC PRO, its new ten channel IP receiver, featuring 20 chargeability windows and a graphic LCD display.

The following improvements have been introduced in this new receiver with respect to the previous ELREC 10 unit :

HARDWARE FEATURES:

  • The size has been reduced by 4 cm in height : 31x 21x 21 cm
  • The power consumption has been reduced by a ratio of three, which means that with less batteries it is possible to have a longer autonomy.
  • As a result, the new system is 2 kg lighter than the ELREC 10, with a weight of 6 kg only.
  • The data (21 000 readings max.) are stored in flash memories not requiring any lithium battery for safeguard.
  • The new system is compatible with the existing SWITCH Plus boxes for automatic switching of electrodes according to preset sequences. In such a case, the receiver is used as a single channel unit ; with SWITCH Pro boxes (to be introduced next), the full ten channel capability of the ELREC PRO will be usable for a higher acquisition speed.
SOFTWARE FEATURES:
  • Each new reading is stored as a specific unit file, making easier the grouping of readings corresponding to a given profile, specially for the last (edge) points of a line obtained with a smaller number of dipoles than the main part of the profile.
  • The data format is compatible with the PROSYS software, which means that the operator can easily visualize the numerical values of the data, automatically sort them according to the standard deviation of the chargeability measurement, merge two files stored under different names, introduce the elevation of each electrode, etc.
  • The ELECTRE II software can be used to define and upload preset sequences of measurements according to any type of electrode array.
Related Information:
See Data Examples See Data Examples
See Data Examples Automated Electrode Switching for IP
 
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ELREC T Resistivity/IP Transmitter/Receiver

The Elrec T is a crossover instrument, bridging the capabilities of both a resistivity meter and an IP receiver. As a resistivity meter it offers all of the functions and capabilities as described for the Syscal R2. As an IP receiver it offers the functions and specifications of the R2, as well, but as a two dipole receiver.

ELREC T Resistivity/IP Transmitter/Receiver
Versatile IP or Resistivity System

Features:

  • Transmitter/Receiver Mode
  • Receiver Only Mode
  • Two Dipole IP Receiver
  • 1600 V Peak to Peak
General:

The Elrec T is truly a crossover instrument, bridging the capabilities of both a resistivity meter and an IP receiver. As a resistivity meter it offers all of the functions and capabilities as described for the Syscal R2. As an IP receiver it offers the functions and specifications of the R2, as well, but as a two dipole receiver.

As a resistivity meter, functioning in the transmitter/receiver mode, the Elrec T may be powered with either a 125, 250, or 1200 Watt converter. For a complete description of these capabilities please refer to the Syscal R2 specifications. The Elrec T offers the same receiver specifications for resolution, stacking, and memory operation. It is also compatible with the Intelligent Node automated switching system.

For deeper investigations the Elrec T may be used as a conventional IP receiver, offering two dipoles. In the receiver only mode it may be used with any time domain transmitter such as the VIP 3000, VIP 4000, or VIP 10000. In this mode the Elrec T offers the same specifications as the Elrec 2. Synchronization is automatic with a 10 ms sampling rate.

Specifications:

  • Maximum Output Voltage: 800V (1600 V peak-to-peak)
  • Maximum Output Current: 2.4A
  • Output Current Specifications:
  • Resolution: 10A Accuracy: standard 0.3% (max 1% from -20C to +70C)
  • Output Current Waveform:
  • Frequency domain: ON+, ON- for resistivity Time domain: ON+, OFF, ON-, OFF for resistivity and chargeability
  • Pulse Duration: (ON time) programmable from 0.25 to 10s, with preset values of 0.5s, 1s and 2s
  • Overheating Protecting: Thermal circuit breaker
DC Power Source:
    The external DC source for ground energization can be:
  • 125W DC/DC converter (400V, 4kg) with battery
  • 250W DC/DC converter (800V, 5kg) with battery
  • 1200W AC/DC converter (800V, 25 kg) with 220V (or 110V) motor generator
Receiver:
  • Input Impedance: 10Mohms
  • Input over voltage Protection
  • Input Voltage Range: -5V to +5V
  • Automatic SP Bucking: -5V to +5V with linear drift correction (up to 1 mV/s)
  • Power Line Rejection: 50 Hz and 60Hz
  • Ground Resistance Measurement: from 0.1 to 1,000 Kohms
Voltage Measurement:
  • Resolution: 1V after stacking Accuracy: standard 0.3% (max 1% from -20C to +70C)
Chargeability Measurement:
  • Resolution: 0.1 mV/V Accuracy: 1% of displayed value for a voltage greater than 10mV
  • Stacking: Continuous digital stacking up to 250 stacks
Two Dipole Receiver Mode:
  • Requires a Time Domain waveform transmitter with 0.5, 1 or 2s pulse duration
  • Automatic synchronization with 10ms sampling rate
  • Common mode rejection between channels 86dB (for RS=0)
Standard Components:
    The ELREC T console, data transfer cable, instruction manual and shipping case.
Related Information:
250W DC/DC Converter 250W DC/DC Converter
 
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Heritage Geophysics Inc.   625 Valley Road, Littleton, CO 80124   Tel & Fax: (303) 768-8345   Cell (720) 320-2821

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