B. Receiver & Transmitter Settings
- Settings are most often dictated by geologic/field conditions, instrument capabilities, and personal preference.
- To use pre-loaded instrument settings, navigate one tab to the left (‘Load/Save Settings’ view). This tab will allow you to load
and view recommended ‘starting’ settings for various types of surveys.
Receiver Settings
o Measure mode: Select desired measurement mode:
“Res” = resistivity measurements
“Res, IP” = resistivity and traditional 50% duty cycle IP measurements
“IP 100%” = resistivity and novel 100% duty cycle IP measurements.
o Stacking & Error limit: For “Res” or “Res,IP” mode this is number of
repetitions to improve data quality; maximum will be either the chosen
value or when the resistivity error drops below the percentage limit. For
“IP100%” mode, the maximum category defines how many current
polarity ‘switch-overs’ there will be (this is when the IP effect is recorded),
it always does that many switch-overs regardless of resistivity data quality.
o Delay & Acq. Time: defines total ‘current on’ time, a longer delay will avoid
IP effects, longer acquisition times average out noise better.
o IP Windows: Rely on pre-loaded settings for IP parameters.
o Full Wave Form: In addition to the single averaged data values measured at each location, choose this option to map the
full output and input current and voltage patterns during the measurement cycle. Does not increase measurement time
but creates bigger project files.
o Power line frequency: Select the power line frequency, based on region/location of survey (either 50Hz or 60Hz).
o Sample rate: Define how often the output current/voltage and input voltages are recorded for creating the full wave form.
Transmitter Settings
o Minimum & Maximum settings: Maximum values will limit the instrument
output; minimum values do not force that amount for current / voltage /
power to be used (actual values are based on ground conditions) but
instead they provide a warning if the values fall below this threshold.
o Electrode Test: Choose ‘Focus One’, this allows the instrument to test the
contact resistance and connection of each electrode on the survey line.
o Bad & Fail electrode: Select threshold for classifying each electrode
during the electrode test. Values below “bad”, count as a pass (low
contact resistance).
o Electrode test current: Do not change.
o Load variation margin: Defines how much the instrument can vary the
settings during measurement to maintain constant current – set to 10%.
MEASUREMENTS
A. Measurement Configuration
- Navigate to the ‘Progress’ view.
- < SAFETY SWITCH STOP > indicates emergency stop button is in use.
- Select < Create New Station (Roll Along) >. A pop-out window will open.
- Station position is location of first electrode – this is displayed in electrode position rather than distance; this means the
Station Positions. (In electrode positions not distance); check spread extent reflects the correct length of survey line.
- Select ‘4 cables no move’ and exit pop-out window by selecting < OK >.
- Caution: Before beginning measurements, check the survey line and ensure the area is clear.
- Turn the emergency stop button until it pops out. Then, select the < Start Measuring > message.
- A warning message will appear. Select <OK> to accept and continue.
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