Cable impedance
Measurement procedure:
First, connect the measuring device directly to the source and set the
corresponding current load (recommended value: 1 A). Press
and hold the button to start data recording.
Now, disconnect the meter and then connect it to the power source via a
microUSB or type-C data input connection and set the load current to the
same value as in the first step. Press
and hold the button to
switch to the to begin data recording.
The display prompt stops flashing and the resistance measurement test of
the data connection cable is completed and the value is displayed.
UM25C directly at the power
supply system:
Voltage and current values
are displayed
UM25C via data connection:
Voltage and current values are
displayed
Resistance of the data
connection cable
Attention!
If the screen goes black in the second step, this means
that the voltage difference is too high and the tester switches to the
4 V shutdown state. The load current must be reduced.
Then restart the measurement from the first step. After the
resistance test of the data connection cable is completed, the tester
must be switched off and on again to continue the measurement.
Measurement graph
