KEPCO BOP-GL 1KW, Operator'S Manual

Page: 72 / 174

3-8
BOP-1K-GL 111315
Similarly, a BOP 36-28GL, capable of delivering ±28A in current mode can be configured to
allow current to be adjusted from –0.5A to +10A by setting –Current Min to –0.5 and +Current
Max to +10. Adjustment range is between 0 and E
Onom
for voltage and 0 and I
Onom
for current.
Note that these software limits are not the same as the Protect Limits described in PAR. 3.3.6.
To accomplish this via either GPIB or RS 232 ports send the following SCPI commands:
CURR:LIM:POS 10 Sets current max limit to 10 Amperes.
CURR:LIM:NEG 5 Sets current min limit to 0.5 Amperes.
To ensure these settings are restored after a power cycle send MEM:UPD LIM and tag the
unit with the new power-up configuration. To restore factory default limits and undo the limits
saved by MEM:UPD LIM command, either perform a reset power-up (see PAR. 3.3.2.1) or
digitally query the limit(s), then digitally change them as needed, (if desired, save for power-
up using MEM:UPD LIM). Tag the unit with new power-up settings.
The main channel software limit values can be lowered (closer to zero) by the user, e.g., to pre-
vent inadvertent damage to a specific circuit under test. When the maximum/minimum values
are lowered, the unit will not accept values that exceed the new software limits. The main chan-
nel software limits are always in effect, for both analog control and digital control. If the user
attempts to program a value that exceeds the software limit using a digital command, the com-
mand is considered invalid and is disregarded: a 120 error is produced. If analog control is
enabled, the output is clamped to the software limit for programmed values higher than the soft-
ware limit.
If main channel software limits are changed from the default, the protection limits must
be changed to correspond to the new software limits (see PAR. 3.3.6).
As an example,
chVoltage Max and –Voltage Min of a BOP 36-28GL to ±3V, respectively, causes the
unit to behave as if it was a BOP 3-28GL. In this case it is important to change the +V Protect
Max and –V Protect Min limits (e.g., to ±3.3V, respectively) so that the load is protected when
operating in Current Mode. This is done by sending the following command.
VOLT:PROT:LIM 3.3 This sets both limits to 3.3 volts.
It is also possible to establish different values for positive and negative limts as follows;
VOLT:PROT:LIM:POS 3.3 This sets the positive limit to 3.3 volts.
VOLT:PROT:LIM:NEG 2.9 This sets the negative limit to 2.9 volts.
When different values for positve and negative limits are set as above, Sending the command
VOLT 3.3 or VOLT:PROT 3.3 sets the positive protection to 3.3 and the negative protection to
2.9 without reporting an error. Sending VOLT:PROT? causes the unit to return 3.3,2.9, indicat-
ing the positive protection is set to 3.3 Volts and the negative protection is set to 2.9 Volts.
Sending VOLT:PROT:NEG 3.3 will not change the negative protection setting and will place a
“Voltage Out of Range” error into the error queue.
To ensure these settings are restored after a power cycle send MEM:UPD LIM and tag the
unit with the new power-up configuration. To restore factory default limits and undo the limits
saved by MEM:UPD LIM command, perform a reset power-up (see PAR. 3.3.2.1).