EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
Check the following items in case of trouble with the instrument. If any questions should remain, contact
EKO for further technical support.
Table 10-3. Troubleshooting
I-V Curve cannot be measured.
・ Make sure the PV module/array capacity is not exceeding the MP-11
measureable range limit.
・ Fuse may be blown. MP-11 is a precision instrument; DO NO OPEN the
instrument to prevent secondary accident. Immediately contact EKO for
fuse replacement.
PC and the Main Unit are not
communicating.
・ Check whether the USB driver is properly installed in the PC.
・ Check the COM port number selection in the General Setting.
Cannot take continuous
measurement
Check the time setting; the end time maybe setup earlier than the start time.
Isc side of the I-V Curve is
higher.
This is not a defect. This condition maybe seen when most of the modules
/strings are shaded or large capacity PV devices, such as amorphous PV
module/array and HIT PV module/array, are measured. This condition cannot
be avoided with the capacitive load method used on this I-V Checker; however,
the value for the Isc are calculated with linear approximation from the flat area
of the I-V Curve, and it is taken measures not to affect the value itself as much
as possible.
・ FF value of a measured I-V
Curve is too small.
・ Isc side of a measured I-V
Curve is too far apart from
the vertical axis of the graph.
The cable for PV module/array maybe too long or the junction resistance maybe
too big. The parts of resistance for measurement circuit and the cable will affect
the measurement value. A PV module/array with relatively low voltage and
large current value may cause this condition.
The date/time setting goes out
of order.
MP-11 uses a backup battery which maintains the internal clock operation
Thus when the batteries die, the setup date and time will be cleared.
Always check the date and time before use; when they are out of order, set up
again.
The parameters setup from PC
are not reflected on the Main
Unit.
MP-11 is capable of setting the parameters from PC when using it with PC
connected; however, the parameter setup from PC is erased when the power of
Main Unit is turned off. Set the parameters on the Main Unit again.
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