B&K Precision 866C Instrukcja Użytkownika Pobierz pdf (Strona 41)

front panel using the I-set, V-set, P-set, or R-set keys.

To set these protection values, use the following keystrokes:

Keys Display

Shift + Menu :CONFIG

▽ :SYSTEM SET

Enter Select between:

:MAX CURRENT SET

:MAX POWER SET

:MAX VOLTAGE SET

using the △ and ▽ arrow keys, then press Enter. Enter the desired value,

then press Enter to accept it.

Esc Esc Exit from the menu.

Example: Suppose you are measuring current vs. voltage characteristics of a 1 watt resistor. You

could set the maximum allowed power to 1.1 watts to test the resistor's rating, yet not go over the

maximum rating by more than 10% to ensure you don't destroy the resistor. If you tried to use the P-

set key to set the power to more than 1.1 W, the instrument will limit the set value to 1.1 W.

Over Voltage protection

If input voltage exceeds the voltage limit set by the user, the DC load will turn the input OFF and the

buzzer will sound. The display will show OVER VOLTAGE. The maximum voltage limit value is equal to

the maximum rated voltage for each model. For the over voltage protection state to be activated, the voltage

level presented to the load terminal must exceed the limit set value by approximately 5%.

Over Current protection

When operating in CR, CC or CW mode, the load current will be limited by a current limit value set

by the user. The maximum current limit value is equal to the maximum rated current for each model.

Once the maximum current limit is reached, the DC Load will enter the over current protection state

and the current will be limited to the set value. (The input will not turn off). If the DC load previously

operated CR or CW mode, the DC load will automatically revert to CC mode and the VFD display

will indicate CC. When the DC load operates in a combined CV / transition mode or CV / List mode,

the buzzer will sound if the input current exceeds the current limit and the display will show a

flashing current value.

Over Power protection

If the input power exceeds the power limit in the normal operation mode, the DC load will enter the over power

protection state. The display will show CW.

If the input power exceeds the limit when in transition mode or list mode, the buzzer will sound and the

display will flash the current value and voltage value.

Reverse voltage protection

This feature protects the load module in case the DC input terminals are connected to a power source with

8500 DC Load Series Version: November 4, 2008 Page 41 of 76

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B&K Precision 866C Instrukcja Użytkownika Strona 41