81001 Universal Signal Averaging Resistivity Meter GTR-2

The new resistivity meter GTR-2 combines
an excellent depth penetration with a
relatively low output current. It combines a
numerical stacking of consecutive readings
with automatic current reversal to produce
a high accuracy output.

The fast sampling and continuous
calculation of the running average
performed by a sophisticated
microprocessor allow virtual signal
enhancement. This technique is generally
recognised to be the best method to
eliminate SP and other noises. The GTR-2
also controls the SP level within each
measurement cycle in order to take into
account possible variations occuring during
the measurement.

Thanks to a highcut filter and to cycle
periods calculated to reject industrial
frequencies, the GTR-2 can extract
coherent signals from an apparently random
background.


Specifications

Voltage measurements ðV and SP:                                                
4 digits with automatic ranges                         Measuring range: ± 5 V                                     
Resolution: 0,01 mV                         
Inputprotection: ± 600 VDC                       
Input impedance: 10 Mohm                     
Overall accuracy: ± 2 %

Current measurement :
Measuring range: 5 A max.                
Resolution: 0,1 mA                       
Programmable K factor: from 1 to 99.99

Internal batteries: 6 V, 6 Ah rechargeable
Ambient temperature: - 5°C to + 50° C  
Dimensions: 360 x 260 x 155 mm           
Weight: 4.5 kg                                       
Number of programmable measuring        
cycles: 1 to 32                                       
Duration of programmable cycles: 0,96 s to 5,12 s

All accessories for geotechnical surveying such as
electrodes and cables are available from our
stock.

Display

As illustrated in the example below, the
 operator has permanent control over the
measurement  parameters, including the
apparent resistivity calculated for a K factor
previously entered through the  keyboard.
The operator can follow the evolution of
these parameters during the measurement
which can be completed immediately when
results obtained are satisfactory.

Memory / RS-232 serial interface

Every parameter displayed can be saved
using automatic sequential numbering after
each measurement is completed.  Memory
size: 1000 measurements.

Data transfer capability to a PC computer
via RS232 serial interface is included.

                   

Simplicity of operation

After a few minutes, you’ll become familiar with the instrument.  Choose the mode and introduce  the K factor, then press the ‘’MEASURE’’ key.
Write the measurement in a notebook or enter it into the memory.