KEPCO BHK 1000-0.2MG Operator'S Manual Download

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BHK-MG (OPR) 032816

1.4.6

NONVOLATILE STORAGE OF PROGRAMMED SEQUENCES OR ACTIVE SETTINGS

The BHK-MG Power Supply contains 40 memory locations for each current range that can be
used either to preprogram a sequence of output values or to store active settings. For program-
ming sequences each memory location accommodates six parameters: output voltage, output
current, overvoltage, overcurrent, time (how long the parameters are in effect) and the next
address in the sequence. Values are stored in the nonvolatile memory, and are retained when
the unit is turned off. Refer to PAR. 3.2.16 for more information.

The same 40 memory locations are also available to save the active programmed settings (volt-
age, current, overvoltage, overcurrent). The saved setting can be recalled by specifying the
memory location. Refer to PAR’s. 3.2.13 and 3.2.14 for more information.

1.4.7

CURRENT SCALE

Output current of the power supply can be scaled down by a factor of 10, while at the same time
increasing the current resolution by a factor of 10. For example the BHK 500-0.4MG has maxi-
mum output values of 500V d-c, 0.4A d-c and a current resolution of 0.1mA d-c; scaling down
the output current results in a power supply with maximum values of 500V d-c, 0.04A d-c with a
current resolution of 0.01mA d-c. Current scaling is easily accomplished using the Menu. Refer
to PAR. 3.2.10 for more information.

Measurement of a decreasing output current of the power supply that falls below 8.98% ±0.01%
of the rated value is automatically measured with increased resolution/accuracy by a factor of
10 until the current rises above 9.69% ±0.01% of rated value.

The factory setting is for the high current range, shown on the top line of the LCD in command
entry status by the message “

Ihigh

.” The current scale setting is retained, and displayed upon

turn-on as either

Ihigh

Ilow

1.4.8

FAST MODE/SLOW MODE SELECTION

BHK-MG Series Power Supplies can be configured by external strapping for either slow mode
operation with the internal output capacitor connected to the output, or fast mode operation with
the internal output capacitor disconnected from the output. The slow mode (default state) is rec-
ommended for voltage stabilization because of its low output noise and low recovery amplitude
to a dynamically changing load. The fast mode offers a faster response to step or dynamic pro-
gramming of the output voltage (in voltage mode), when the power supply is used as a power
amplifier. Fast mode is also recommended for current stabilization because of its fast response
to a dynamically changing load. Refer to PAR. 3.7.1 for more information.

1.4.9

EXTERNAL TRIGGER PORT

The external trigger port provides two functions: a trigger input can be used to restore the output
to previously defined settings using SCPI commands (see PAR. 3.3.4) and a shutdown input
can be used to immediately shut down the power supply output (see PAR. 3.2.7.3).