3-6
BHK-MG (OPR) 032816
The BHK-MG incorporates a “keypad lockout” command which allows the
LOCAL
key to be dis-
abled during remote operation, preventing inadvertent setting of the power supply to Local
mode. When the keypad is locked, the LCD displays
RwL
in place of
LOC
. If the keypad is
locked, it must be unlocked either by a remote command (see Appendix B, PAR. B.84), or
cycling the power supply off then on.
3.2.5
ADJUSTING LCD CONTRAST
With the power supply in command entry status
(:_:_:)
, press
MENU
key until LCD displays
CONTRAST
. Press
or
key to increase or decrease contrast for optimum viewing. The con-
trast can also be set directly by entering a number from
0
to
9
. Press
ENTER
or
CLEAR
to exit
menu.
3.2.6
ENABLING/DISABLING AUDIBLE BEEPS
With the power supply in command entry status
(:_:_:)
, press
MENU
key until LCD displays
SPEAKER
. The top line indicates if the speaker is on or off (the factory default setting is speaker
on). Enter
1
to enable the speaker, or
0
to disable the speaker. Press
ENTER
or
CLEAR
to exit
menu. Audible beeps associated with safety or failure messages are always enabled and can
not be disabled.
3.2.7
ENABLING/DISABLING DC OUTPUT POWER
When the power supply is turned on, the output is automatically disabled or enabled depending
on
OUT
on
or
off
@Pwr-Up
(see PAR. 3.2.7.4), and the bottom line of the LCD gives voltage
and current measurements at the output.
3.2.7.1
DISABLING DC OUTPUT WHEN USING DIGITAL INPUTS ONLY (KEYPAD AND/OR GPIB)
To disable the output, press the red
OUTPUT ON/OFF
key; the top line of the LCD reads:
OFF
and the bottom line displays output voltage and current (zero). When the output is disabled, volt-
age and current are programmed to zero; the power supply remains in Command Entry status.
Pressing the
OUTPUT ON/OFF
key again enables the output: the previously programmed val-
ues of voltage and current are restored and the LCD displays the mode (CV or CC) and actual
values of output voltage and current.
3.2.7.2
DISABLING DC OUTPUT WHEN USING ANALOG CONTROL.
If analog control is used without digital programming, simply set the analog input to a value that
brings the output voltage and current to zero without pressing the
OUTPUT ON/OFF
key.
To disable the output if both analog and digital (keypad and/or GPIB) control are used, first
press the red
OUTPUT ON/OFF
key; the top line of the LCD reads:
OFF
and the bottom line dis-
plays output voltage and current controlled by analog means. Set the analog input to a value
that brings the output current and voltage to zero. Pressing the
OUTPUT ON/OFF
key again
enables the output: the previously programmed values of voltage and current (from the keypad
or GPIB) are restored and the LCD displays the mode (CV or CC) and actual values of output
voltage and current. Analog inputs must be restored separately to return to the output settings in
effect when the output was disabled.
After disabling the output by pressing the
OUTPUT ON/OFF
key, if the analog input is causing
more than approximately 8Vd-c to appear at the output terminals, or if current is being supplied
to the load exceeds approximately 0.3% of full scale for the selected range, the unit will beep
and enter a controlled shutdown for safety purposes. Shutdown can be avoided by setting the
analog input to a value that brings the BHK-MG output below 8Vd-c and output current to less
Summary of Contents for BHK 1000-0.2MG
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Page 17: ...BHK MG032816 xi FIGURE 1 1 BHK MG SERIES PROGRAMMABLE POWER SUPPLY ...
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Page 101: ...BHK MG OPR 032816 3 55 FIGURE 3 20 SERIES AUTOMATIC CONFIGURATION ...
Page 109: ...BHK MG OPR 032816 3 63 FIGURE 3 23 PARALLEL AUTOMATIC CONFIGURATION ...
Page 114: ...3 68 BHK MG OPR 032816 FIGURE 3 25 PARALLEL MASTER SLAVE CURRENT MODE CONFIGURATION ...
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