For a good use
The state of the Tx battery used during an acquisition in multi-electrode mode is of paramount importance for the quality of the measurement, and to keep your battery and Syscal in a good shape.
The state of a battery can partially be given by its voltage [V]. The voltage can be measured with a voltmeter directly plugged on the two terminals of the battery (no-load measurement). This value informs on its charge. Do never start an acquisition with Tx battery voltage too low (e.g. 11 V).
However, fully charged worn batteries can give high voltages [13.5 V] when measured with no-load. If you could measure the battery during the very first tens of milliseconds of the injection, you would see that the on-load measurement of the voltage would be much lower.
So, to check your battery state, follow the Tx battery level icon on the right bottom corner of the display screen of your Syscal. If you see strong variation of the voltage during the measurement, your battery is certainly out of order.
For customers having new systems, the Tx-Battery measured during the injection (on-load measurement) is saved during the acquisition. If you plot the battery voltage vs the measurement number on Prosys II, you can see the evolution of the battery. A battery in good state will present a voltage starting from 12.5/13 V and decreasing nearly linearly with the measurement down to 11V.
A battery which is out of order will show high voltage variations between 12.5V and 9/10 V throughout the measurement. At a certain point, the voltage can fall drastically under 7.5V, where the Syscal stops the measurements and indicate 9999.99A injected currents. If you measure the voltage of this battery not connected to the Syscal (no-load measurement), you could measure up to 12.5 V.
Be careful to not use a battery which is out of order, as the Syscal starts to reduce the power of injection when the battery is low, you will get a lower signal to noise ratio. Your measurements will be therefore less accurate (especially for IP measurements).
Second, if you use very bad shape battery, the Syscal will try to extract a constant power from the battery. As the voltage will decrease drastically, the current extracted from the batterry will be increased in compensation. Over long period, these high current could lead to internal overheating that could damage your system.
One can notice that any resistance between the battery poles and the plugs of the system will add to this internal resistance contributing to a degraded system . So it is obvious that only very good clips and strong and short wires must be used.
Check that the emergency red button is not engaged. In that case turn it of one quarter of turn to release it.
Check the condition of the sockets of the system (Syscal / connecting boxes) and plugs of the multi core cable.
- Check that the rubber is not damaged due to arcing between pins for example
- Check in the plugs if there are some bent pins
- Check in the sockets that some contacts have not been pushed backwards - Dry with water repellant product like WD40 in case of wet conditions.
If everything is fine, test the unit in standard mode using 4 individual wires plugged into the front panel (using the AMNB Wenner array for example) and enter a large number of stacks “20” to control the stability of the measurement.
- Control the Rs check,
- Control the Iab
- Control the Vmn
- Control the stability of the measurement (“Q” factor).
This allows to control if the transmission part works properly and to determine if the problem is linked to the multi-electrodes part.
This generally means that the unit has been reinitialized with an erroneous input range: reset it anew, following the procedure we can send to you. The control can be easily done plugging a 1.5V cell on the M and N sockets and by checking with the “Monitor” function.
- Select “Poly Dipole” or “Poly-Pole” array
- Enter XCa / XP1 / A-B distance / P1-P2 distance
- Select “Modify”, and change the position of each potential electrode
In case of problem of injection in that configuration connect an external 12V battery directly to the Syscal and check if the injection is Ok or not to determine if the problem is linked to the converter of to the Syscal. Check also with a voltmeter the output voltage of the converter for the different voltage ranges.
Input protection fuse and spare fuse are present in the unit. Check they state and replace them if necessary (IRIS can send the procedure on request). The maximal input voltage for the external battery is 20V. Use 4mm section wires to have a low resistance and avoid overheating.
In case of “Tx low batt” or “overheat” messages, a loosen connection of the ribbon cable can be the reason. Sometimes, a re-initialization of the unit can solve the trouble (procedure sent on request).
For communication, you can use the direct USB port or the serial port, but not both simultaneously.
Install correctly the USB driver (refering to the FAQ : How to install properly the IRIS Instruments USB driver?). In all the IRIS Instruments software, select "Communication" -> "Communication port" -> "USB" to communicate through your USB port.
For the USB communication with IRIS units: The Serial / USB adapters that can be found in the market are generally not compatible. We recommend to use the USB cable / driver developed by IRIS Instruments.
The dynamic acquisition using Sysmar with the Syscal Pro or with the Syscal Pro Deep Marine is performed with a 13 wire cable which is directly connected to the front panel (ABP1…P11). The measurements are performed in “standard” mode and cannot be performed in “automatic sequence mode”.
To check the grounding resistance of some specific electrodes, select “System/Check switch / Check several electrodes”.
The “Rx only” mode (mode using the Syscal Pro as just a receiver) can be implemented into your unit. This update requires sending the unit to IRIS Instruments. In that mode you need to use an external transmitter (such as a VIP) and the Syscal Pro will synchronize automatically with the transmission signal.
Test of units and multicore cables can be done thanks to test boxes specifically developed by IRIS Instruments (resistance boxes, isolation boxes, etc.). Contact IRIS Instruments for more information.
In case of trouble with the internal battery supplying, control the value of this battery displayed by the « Batt » key when the charger is plugged on. This allow to control if the problem is due to the charger or to the battery itself. Internal batteries have to be regularly replaced (every about 5 years for a normal use).
The quality factor uses the formulae of the standard deviation of the Vmn/Iab ratio measured during the stacking process. After each stack, an average value of the V/I is computed (by the different samples measured) and the new deviation is then computed from the beginning of the measurement (for information data sampling is 10 ms).
So for example, after 3 stacks, the unit computes the average value from the beginning of the measurement: A3 - Then, at this stage, the standard deviation is computed with A1 (average value after stack1), A2 (average value after stack2) and A3 (average value after stack3).
And, the information is then given in %, as this is the coefficient of variation 100 x (standard deviation(rho)/mean(rho)) which is finally computed and displayed.
During measurement the Sp parameter (Spontaneous Polarization) is continuously measured during acquisition for an automatic measurement and compensation.
This is measured thanks to alternating pulses and is computed by the Vp+ and Vp- values during the stacking. This allows an automatic measurement and compensation of the linear drift with time.
Sp = (Vp+ +2 Vp- + Vp+)/4
Vp = (Vp+ -2 Vp- + Vp+)/4
The sign of the Vp parameter depends on the array. Tt can be negative like for dipole -dipole array or positive like for Wenner array (the sign is in relation to the MN dipole position in regards to the AB dipole position)
To re-initialize the Syscal Kid:
- Switch off the unit
- Press simultaneously the right and left arrow keys
- Switch on the unit keeping the keys pressed
- The display will be: "FORMAT" NO or YES
- Release the keys
- Choose "Yes" and validate by ENTER
- The Syscal Kid will start automatically after a while.
The GPS compatible with our units are GPS using the NMEA 0183 norm.