225 Series User’s Manual
9
118120-001-Rev. A
Below are the “T” commands with some typical strings
that are returned to the GPIB controlled in response:
T0 “N
Vxx.xxxK
Ix.xxxxM”
Note: These strings are, or are not, followed
T1 “S
Vx.xxxxK”
by Line Terminators CR/LF depending
T2 “T
Ixxx.xxU”
upon the chosen setting of switch S9,
Position A6 (see section 3.2)
A leading “N” in the string means that the output is on.
A leading “S” means that the output was shut down by
the user with a “Z” command or a device clear bus
command. A leading “T” means that the output was
tripped due to an overload detection. Also:
“V” in the string means voltage
“I” in the string means current
“K” in the string means kilovolts
“M” in the string means milliamps
“U” in the string means microamps
3.4.9 STATUS
(“M)
After receiving the “M” command, the unit will return a
character string with its model number, output polarity
setting and software revision. The syntax is:
“M” the single ASCII character
In the returned string, the “+225.03 re0.8” would denote
a positive high voltage output from 0 to +3kV and the
use of revision 0.8 software. The use of CR/LF Line
Terminators depends on S9, position A6 as above.
3.5 SAMPLE
COMPUTER
PROGRAMS
Sample computer programs for use with the Series 225
can be found in the APPENDIX of this manual. Each
sample sends series commands to the power supply and
shows response via the computer’s display.
SECTION IV: LOCAL OPERATION
CAUTION! THIS UNIT CAN STORE
HAZARDOUS VOLTAGE. COMPLETELY
DISCHARGE HIGH VOLTAGE AT REAR PANEL
GROUND TERMINAL BEFORE ATTEMPTING
REMOVAL OF THE HIGH VOLTAGE CABLE
4.1
FRONT PANEL CONTROLS
Figure 4.1 below is the typical layout of the 225 Series
front panel
Figure 4.1
SWITCHES/PUSHBUTTONS/INDICATORS/
DIALS FUNCTION/PURPOSE
POWER ON-OFF
Enables and disables AC power
HIGH VOLTAGE ON-OFF
Enables and Disables high voltage. This
front
panel switch overrides ALL controls in disabling
of the high voltage output.
LOCAL/FUNCTION
Brings unit from GPIB control to front panel
control. It gives the user access to programming
features and to model information.
SET
Used to set the output voltage
LIMIT Used to program the output voltage limit and
output current limit.
ADJUST
Used to adjust the output voltage
VOLTS Enables the display to show output voltage
readings. It is used when changing the output
voltage or the output voltage limit.
Ma Enables
the
display
to show output current
readings. It is used when changing the output
current limit.
ENTER
Finishes a command entry
CLEAR
Used to abort a command sequence.
DIGITAL POTENTIOMETER
For entering numeric and mode selections with
velocity-variable action. Resolution is very high
when turned slowly. If turned rapidly, value
changes are rapid.
LED DISPLAY
Five digits which show voltage and mA/μA
readings and mode settings.
RMT
Remote/Local status of GPIB
LSN
Listener status of GPIB
TLK
Talker status of GPIB
