225 Series User’s Manual
11
118120-001-Rev. A
At the user’s choice, the unit can be made to issue a
service request to the GPIB controller in response to a
current overload. The syntax is:
SrC1
Enables SRQ in response to an
overcurrent detection.
SrC0
Disables SRQ in response to an
overcurrent detection.
4.4
FRONT PANEL MESSAGES
DISPLAY MEANING
E r r
An erroneous command sequence has just
been
rejected
S E
The SET pushbutton has just been
depressed.
A d
The ADJUST pushbutton has just been
depressed.
L i
The LIMIT pushbutton has just been
depressed.
A d r n n
The IEEE-488 GPIB address is the
number
“n
n”
L L O
Local lockout is on.
4.5 OPERATION
EXAMPLES
The following section describes sequences of local
control command entry by way of examples. NOTE:
Errors made during sequence entry will result in the error
message (“E r r”) being displayed on the front panel, but
such errors will be rejected and not affect any previous
programming.
The following are some common examples of NON-
VALID sequences resulting in an “E r r” message
display:
COMMAND ENTRY
REASON FOR ERROR MESSAGE
“ADJUST” “mA”
Cannot adjust power supply output
current.
“SET” “mA”
Cannot set power supply output
current.
“SET” “ENTER”
No controlled parameter, kV or
mA, was selected.
“LIMIT” “ENTER” No controlled parameter was
selected.
“ADJUST” “ENTER”
No controlled parameter was
selected.
“ENTER” No
controlled
parameter or select
function
was
selected.
4.5.1 OUTPUT
VOLTAGE
SETTING
Push “SET” button. “SET” LED lights and “SE”
message is displayed.
Push “VOLTS” button: “VOLTS” LED lights and the
last entered voltage setting value is displayed.
Turn the digital potentiometer knob for the desired output
voltage. (The actual high voltage output will NOT
change until the following step).
Push “ENTER” to finish the sequence. The “SET” and
“VOLTS” LEDs will go off. If the High Voltage switch
is on, the entered voltage value will be outputted and
voltage measurements will be displayed.
4.5.2
OUTPUT VOLTAGE ADJUSTMENT
Push “ADJUST” button: The “ADJUST” LED lights and
the “A d” message is displayed.
Push “VOLTS” button: The “VOLTS” LED lights and
the output voltage is displayed.
Turn the digital potentiometer knob for the desired output
voltage.
CAUTION
: The ACTUAL high voltage output
will start changing immediately in response to this step.
Push “ENTER” to finalize the adjustment and to exit the
adjustment.
4.5.3
SETTING THE OUTPUT VOLTAGE LIMIT
Push “LIMIT” button: The “LIMIT” LED lights and the
“L i” message is displayed.
Push “VOLTS” button: The “VOLTS” LED lights and the
preset limit voltage is displayed.
Turn the digital potentiometer knob to set the new desired
limit.
Push the “ENTER” button to save the displayed entry as
the new voltage limit value. The display then returns to
presenting the previously measured parameter and the
“LIMIT” and “VOLTS” LEDs go out.
4.5.4
SETTING THE OUTPUT CURRENT LIMIT
Push “LIMIT” button: The “LIMIT” LED lights and the
“L i” message is displayed.
Push “mA” button: The “mA” LED lights and the preset
limit current is displayed.
Turn the digital potentiometer knob to set a new desired
limit. Push the “ENTER” button to save the displayed
entry as the new current limit value. The display then
returns to presenting the previously measured parameter
and the “LIMIT” and “mA” LEDs go out.