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| Technical
specifications |
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Six input dipoles
- Input impedance 10 Mohms
- Input voltage range : each dipole : 10 V
max, sum of voltage of dipoles 2 to 6 : 15 V
max
- Automatic SP bucking ±10 V with linear
drift correction up to 1 mV/s
- 20 bits A/D converters
- 50 to 60 Hz power line rejection
- Sampling rate : 10 ms
- Common mode rejection :100 dB (for RS = 0)
- Computation of apparent resistivity,
average chargeability and standard deviation
- Grounding resistance measurement from 0.1
to 467 Kohms
- Battery test : manual and automatic before
each measurement
- Memory capacity : 2500 readings
- RS 232 link for data transfer to micro
computers and printers (300 to 19 200 bauds
rate)
- Remote control through the serial link
STANDARD MODE (TIME DOMAIN)
- Signal waveform : Time Domain (ON+, OFF,
ON-, OFF) with pulse duration of 0.5, 1, 2,
4, 8 seconds
- Up to ten arithmetic, logarithmic, or
fully programmable IP chargeability windows
- Primary voltage : resolution : 1 µV after
stacking, accuracy : typ. 0,3 %
- Chargeability : resolution : 0.01 mV/V,
accuracy : typ. 0,6 %
FREQUENCY MODE
- Signal waveform : either (ON+, ON-) or
(ON+, OFF, ON-, OFF)
- Pulse duration : 1s or 2s
- Frequency effect and relative phase of
fundamental and third harmonics
- Resolution : about 0,01 degree after
stacking
GENERAL FEATURES
- Dimensions : 31x21x21 cm
- Weight : 8 kg with internal battery (6 kg
with dry cells)
- Operating temperature : 40°C to +70°C
- Power supply : 12 V internal battery, (six
1,5 V D size dry cells, optional) ; a 12 V
external battery can also be used |
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 ELREC 6, Six dipole IP receiver
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The
lightweight multi-channel IP receiver
SIX SIMULTANEOUS DIPOLES
TEN PROGRAMMABLE CHARGEABILITY WINDOWS
HIGH ACCURACY AND SENSITIVITY
ELREC 6 OUTSTANDING FEATURES
Six dipoles:
The ELREC 6 receiver is designed to measure six
dipoles simultaneously, which provides a high
efficiency in the field.
Ten programmable windows:
Beside the classical preset logarithmic and
arithmetic modes, ELREC 6 also offers ten 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 on
going readings.
Internal memory:
The memory can store up to 2 500 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 a micro
computer.
Remote control:
ELREC 6 can be fully driven by a micro computer
through the serial link for remote operation
applications.
Frequency mode:
The frequency effect and the phase shift between the
fundamental and the third harmonics can be measured
for a Frequency Domain waveform (ON+, ON-), or for a
Time Domain waveform (ON+, OFF, ON-, OFF).
Field proof Instrument:
ELREC 6 operates in a wide temperature range and
features a fiber-glass case for resistance to field
shocks and vibrations.
ELREC 6 is a six dipole Time Domain Induced Polarization
receiver designed for high productivity surveys in
mineral exploration. It has been designed for being
both a user friendly and a very sensitive IP
receiver. ELREC 6 measuring process has been
optimized to provide the best possible accuracy in
real field conditions.
ELREC 6 FEATURES:
• A noise monitoring function enabling the operator to
check the level of noise observed on each dipole
before the measurement : the digital voltmeter
function displays on the LCD the raw instantaneous
value of potential. In particular, it is possible to
numerically observe the
presence of a pulse square waveform corresponding to
a primary voltage signal and showing the operation
of a transmitter. This function is also available
during the acquisition of a reading.
• A line check/ground resistance measurement which
permits to check that all seven electrodes are
properly connected to the receiver.
• A low-pass analog filter which reduces the effect of
higher frequency natural cultural noises (50-60 Hz).
• Automatic SP compensation, including linear drift
correction (up to 1 mV/s) through a digital filter.
• Automatic gain ranging, within a voltage range of
±10 V.
• Automatic synchronization process : ELREC 6
automatically synchronizes with the signal through a
waveform recognition process ; besides it
automatically resynchronizes 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, with a maximum of 250 stacks. During the
stackings, 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).
• 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 the noise
decreases. This procedure optimizes the time of data
acquisition in very noisy areas.
• A resolution after stacking of 1 µV 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.
• A Normalized chargeability option : the Normalized
option refers the chargeability to a standard IP
decay curve, and permits to point out any EM
coupling effect on the measured signal.
Copyright
© 1998 IRIS Instruments
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