KVH Industries TracPhone FB250 Installation Manual page 131

Appendix B: Technical specifications
B.5.3 Measuring the ship source impedance
Select a power outlet from the ship 24 V DC or 12 V DC system, and measure
the source impedance of the ship installation as described below.
Measure the voltage without load (R.var disconnected).
Set the current to e.g. 1 A by adjusting R.var - and measure the corresponding
voltage change.
Example:
1 A and 50 mV. Source impedance: 50 mV/1 Amp = 50 mΩ.
Battery 24 VDC
118
Ship Installations
TracPhone terminal
Power outlet
BDU Power
for terminal
outlet
V
A
R.var