B&K Precision 8500-8526 - Manual - Manual (Page 30)

Press the V-set button (you may have to press it twice). Note the load is turned off. Set the power
supply to 10V and the supply's current to a very low level, e.g. 0.1 A. Set the DC Load voltage level
well below the supply voltage level, e.g. 1 V. Press the On/Off key. Verify the proper voltage level
(1 V) is shown on the display. Press the
△ or ▽ keys to see the power being dissipated.
Press the P-set button (you may have to press it twice). Note the load is turned off. Set the power
level to 0.1 watt. Press the On/Off key. Press the
△ or ▽ keys to verify that the power is about 0.1
watt.
Press the R-set button (you may have to press it twice). Set the resistance to 100 . Press the
On/Off key. Verify that the current is approximately the displayed voltage in V divided by 100.
You can cycle between the four modes by pressing the I-set, V-set, P-set, and R-set buttons. Note
that the previously-set values are remembered.
If the instrument worked as explained above, you've demonstrated that the four operating modes of
the instrument are working. Please refer to the next section for detailed operation instructions.
Operational introduction
There are four operational modes of the instrument: constant current, constant voltage, constant
power, and constant resistance (we will abbreviate these as CC, CV, CW, and CR, respectively).
These are selected by the I-set, V-set, P-set, and R-set buttons, respectively. If you press a mode
button different than the currently set mode, the load will be set to
OFF and the newly selected
mode's setting will be displayed for about 3 seconds. Pressing the same mode button again will
prompt for the new constant value for the selected mode.
There are three operational conditions for the instrument in these modes: steady state, transient,
and dynamic.
Condition Behavior
Steady state
The selected mode parameter is maintained at a constant value. For example,
if you selected constant current mode and set the current value to 1 A, the
instrument would maintain this current indefinitely when the load is
ON .
Transient
There are two mode parameters and the load switches between these two
settings with user-specified timing. An example of a transient load in constant
resistance mode would be a load of 10 Ω for 1 second and 20 Ω for 3 seconds.
Dynamic
Similar to the transient condition, but capable of emulating more complex time-
dependent loads. The dynamic condition uses lists to specify the time-
dependent behavior.
8500 DC Load Series Version: 030614 Page 30 of 77