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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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 VIP 4000, 4 kW IP transmitter
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The
Light weight 4 kW transmitter powered by a standard motor generator
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3000V output voltage
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Full microprocessor control
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Ease-of-use
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Standard motor generator
Light in weight and provided with a high voltage (3000V) output, the VIP 4000 is particularly
convenient for IP surveys in high resistivity rugged areas and for deep resistivity soundings.
Microprocessor controlled for ease of operation and protection against misuse. All
injection parameters (current, voltages, ...) are controlled. The VIP 4000 can also be
operated through its remote control port (RS232).
The VIP 4000 eight output dipoles provide for higher productivity in the field.
Powered from a standard 220V (or 110V) single phase motor generator, the VIP 4000 eliminates
the maintenance and supply problems associated with custom power sources.
High Outputs:
The VIP 4000 will generate up to 3000 volts for work in high resistivity areas and up to
5 amperes at 600 volts for low resistivity regions. With its weight of only 16kg, the VIP
4000 is the lightest 4000W unit on the market.
Heavy Duty Construction:
Very high quality connectors, and heavy duty industrial components are used throughout.
The VIP 4000 is shock resistant and weatherproof, for a higher reliability.
Fully Automated:
The VIP 4000 is designed for ease of operation. It has a much simplified front panel:
current, dipole and frequency (in the frequency domain) settings are the only parameters
to be selected by the operator. All the other functions, like voltage range setting, are fully automated.
Programmable:
Programming functions are also available, either through the front panel, with a special key inserted,
or from an external computer terminal. These functions are used to select the parameters and options
that are not normally changed during a survey: operating mode, time or frequency domain, cycle time,
frequencies, ... This approach reduces front panel cluttering and drastically reduces the possibility
of operator mistake. Instrument reliability is also increased. For example, it is not possible to
switch dipoles when transmitting. This eliminates the possibility of burning out the selector switch
or the output circuitry.
Complete Display:
A backlighted liquid crystal alphanumeric display is provided for the simultaneous indication
of all output parameters. Ouput current, output voltage, contact resistance and output power are
continuously displayed.
Error Messages:
Messages and warnings are displayed in case of problem or malfunction. Besides, the permanent storage
of all the parameters relating to the operation of the unit make easier the remote
identification of a trouble by the manufacturer for quicker instrument servicing.
Intelligent Regulation:
The VIP 4000 internal microprocessor is capable of excellent current regulation in almost any load.
Current is operator selectable in preprogrammed steps from 50 mA to 5 amperes. Intelligent current
adjustment algorithms are always in operation. For example, the contact resistance will occasionnally
be too high for the VIP 4000 to provide the requested current setting. In such cases, the VIP 4000 will
display a warning message and will set the current to the maximum value allowable under that combination
of current setting and contact resistance. Some reserve current capacity will always be kept to insure
that the current stays constant during the measurements, whatever the contact resistance fluctuations.
Remote Control:
The VIP 4000 is provided with a remote control port. By using radio modems, it can be operated from
a remote location. The VIP 4000 can also be linked to an intelligent receiver, or to a computer, for
the automatic recording of current settings. Finally, synchronization with a receiver or system is
also possible in both directions (i.e. Rx to Tx or Tx to Rx).
Works with a wide range of power generators:
The VIP 4000 IP transmitter can be powered by almost any motor generator providing a nominal 230V, 45-450 Hz
output, single phase, at a suitable KVA rating. It will also work at about half power with a
110V power generator. Low cost commercial generator sets,
available at local hardware or equipment rental stores are perfectly suitable
Copyright
© 1998 IRIS Instruments
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