B&K Precision 8500-8526 - Manual - Manual (Page 38)

Keys Display
prompted for the duration of the 5 A load. In the toggled mode of
operation, this width is ignored, so enter any convenient value.
Enter Displays LEVEL B= X.XXXA . You are being prompted for the second
current value. Press the 1 and 0 keys to enter 10 A.
Enter Enters the 10 A value, then displays WIDTH B = X.XMS . You're being
prompted for the duration of the 10 A load. . In the toggled mode of
operation, this width is ignored, so enter any convenient value
Enter Displays :CONTINUOUS , :PULSE , or :TOGGLED . Use the △ or ▽ arrow
keys to display :TOGGLED .
Enter Returns to the standard display of voltage and current.
To activate this toggled transient condition, press Shift + Tran, then press On/Off. The load will
start at the value you entered for A (5 A). Then press Shift + Trigger to cause the load to switch to
the B level of current (10 A). The next trigger will cause the load to shift back to the A level (5 A).
Subsequent triggers repeat this behavior.
NOTE: This example requires the :CONFIG:TRIGGER menu item be set to :IMMEDIATE. If set
to :EXTERNAL, you'd trigger the instrument with a high TTL level signal on the trigger terminals on
the rear panel. If set to :BUS, you'd trigger the instrument with a software trigger.
Toggle between two test values
When you have entered A and B values through the Shift + S-Tran menu, those values are
available to you at the front panel. Suppose you set the instrument to operate in CC mode at a
current of 1 A. If the transient A level was 5 A and the transient B level was 10 A, you can set the
instrument to the A level by pressing Shift + A. The load has to be on and cannot be in transient
condition (i.e., the
TRAN annunciator must not be lit). Otherwise, the A value will be stored as the
CC mode's current. Similarly, Shift + B causes the B value to be stored as the CC mode's current.
The load can be on or off for this to work.
Lists (dynamic condition)
Transient operation is used for simple step changes in load values. More complicated dynamic
behavior of the load can be obtained through the use of lists. Lists are a sequence of load value and
duration pairs. Lists are the logical extension of transient operation.
Note: Resolution of the step values defined in list mode varies depending on the mode of
operation. In CW, CR, and CV list mode, resolution defined for each list step is maximum at
10 mW, 10 mΩ, and 10 mV respectively. For example, a CW list step can be configured as
10.23 W. For CC list mode, maximum resolution is 1 mA for the step values. For example, a
CC list step can be configured as 1.234 A.
To illustrate the use of a list, we'll create a list that runs the following constant current profile on a
power supply:
8500 DC Load Series Version: 030614 Page 38 of 77