[need help] pv output

halo, i'm new on this technology, i want to ask is it possible to find the output of pv module if its not connected to load?
according to Pmax=Vm.Im or Pmax=Voc.Isc.FF
from multimeter i can get the value of Voc and Isc but i'm stuck how to find the value of Vm and Im
please help me, thanks before
according to Pmax=Vm.Im or Pmax=Voc.Isc.FF
from multimeter i can get the value of Voc and Isc but i'm stuck how to find the value of Vm and Im
please help me, thanks before

Comments
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As a rule of thumb for crystalline silicon cells Vmp is about 80% of Voc. The ratio between Isc and Imp will vary more widely.
To actually measure Vmp and Imp you need to attach a variable resistance load and tune it to the Maximum Power Point before measuring. Or hook it up to an MPPT inverter or to a CC charging in Bulk mode into a depleted battery bank. And the whole time you need to use a calibrated reference light source or have the panels facing directly toward the noon sun on a clear day. Even in the latter case the panel temperature will be an uncontrolled variable.
btw what is the difference between Pmp and Pout?
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from equation 5.12, i need value of Imp and Vmp to get the FF (fill factor) value.
if i cant measure the Vmp or Imp since my PV panel not connected to any load, can i use eq 5.13 to get the FF?
thanks before