Fluke PM2811 User Manual page 109

Application for PM2812 and PM2813 D - 5
The channels 1 and 2 operate in the Constant Current mode, and Channel 3 in
the Constant voltage mode.
This example will not work if the current through the load decreases below 10A.
Then the current contribution of Channel 3 is reduced to 0A, and either Channel
1 or Channel 2 (or both) will enter the Constant Voltage mode (at 10.1V). As there
are now at least two channels in Constant Voltage mode, the one with the lowest
Vset (Channel 3) will activate its down programmer, sinking about 0.5A. If you are
not quite certain about the minimum current required, you are advised to use the
procedure given under case 3. Then you must adjust all channels exactly to 10V.
Case 3: Constant Voltage, Output Current from 0A to the maximum
This needs the most care to prevent a down programmer to become active,
because all channels must be set exactly to the same voltage. This can best be
done at low output currents. Do this as follows. Connect the channels in parallel.
Connect a load that allows the required voltage and needs a small current, for
example 1% of the required maximum current. Set all channels to the required
Constant Voltage value and to an equal part of the required maximum current. If
the voltages from all channels are exactly equal, then all channels will supply an
equal part of the current. If a channel does not supply current (readback 0.00A),
select this channel and use the -V+ button to carefully increase the voltage until
the channel starts to supply current.
Check if the other channels still supply current. If not, you may have increased the
voltage of one channel to much. If all channels supply current, disconnect the load
and connect the real load.