225 Series User’s Manual
12
118120-001-Rev. A
SECTION V: REMOTE ANALOG 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
5.1 PROGRAM
CONTROL
SWITCH
Before a unit can be programmed with a remote analog
(0 to +5VDC) signal, it must be configured by setting its
rear panel PROGRAM CONTROL switch (S101) in the
REMOTE ANALOG. Note: All other monitoring and
non-programming functions remain active, regardless of
the S102 position.
5.2 REMOTE
CONTROL
The high voltage output can be remotely programmed
from an external voltage source. A 0 to +5VDC
programming voltage applied to Pin 6 of the J107
(PROGRAMMING/MONITOR) connector jack on the
rear panel will remotely program the high voltage output
from zero to maximum voltage.
Programming can also be accomplished using a
potentiometer connected between Pin 4 (+5VDC), Pin 7
(GND) with the wiper connected to Pin 6. The
potentiometer should be a low temperature coefficient
wirewound or cermet type of 5k
ȍ
to 20k
ȍ
resistance
value. The output will then be in proportion to the wiper
position.
5.3 ANALOG
MONITORING
SIGNALS
Analog monitoring signals of 0 to +5VDC via 10k
ȍ
are
provided, which are linearly proportional to the unit’s
output voltage and current. A TTL-compatible logic
TRIP input, a +5VDC reference voltage output and an
NPN open collector polarity indicator are all available at
J107.
Figure 5.1 on the next page defines the pin locations and
functions of the rear panel analog monitor and remote
analog programming connector.
Figure 5.1
PIN FUNCTION
1
Buffered output voltage monitor, 0 to +5VDC
via
10k
ȍ
2 No
connection
3
TTL level compatible logic input. Input logic
zero disables high voltage generation. Open
circuit or input logic one enables high voltage
generation.
4
Pre5VDC reference output, referenced to
analog
ground.
5
Buffered output current monitor, 0 to +5VDC via
0k
ȍ
6
Remote analog programming input, 0 to +5VDC
7 Analog
ground
8 Digital
ground
9
NPN open collector with respect to digital
round,
indicating
output high voltage polarity.
NPN saturation denotes positive polarity (logic
0), NPN cut-off denotes negative polarity (logic
1)
SECTION VI: MAINTENANCE
6.1 GENERAL
Your 225 Series high voltage power supply is designed
for reliable, trouble-free operation. If any questions
should arise, contact Spellman’s Customer Service
Department for assistance or return authorization.
The power supply can be returned to the factory for
annual calibration and certification to its original
specifications. For traceability, a certificate will be
issued, identifying the serial number of the unit calibrated
and all test equipment used to perform the calibration.
All measurements are traceable to the National Institute of
Standards and Technology (NIST). Contact factory for
additional details.
SECTION VII: APPENDIX
7.1
IBM PC/XT/AT (DOS 3.1 OR HIGHER
REQUIRED)
1.
Equip the computer with the IO Tech Personal
488A Interface.
2.
Install software driver per the Personal 488A
instructions.
3.
Set the address switches on the 225 Series to 7.
4.
Run the Basic interpreter with comes with the
computer.
5.
Enter the lines of the program below using the
return key after each line.
6.
Press RUN (F2) after the total program has been
executed. Enter a command when prompted.
For example, if you enter “P0.1000KG”, wait
approximately two seconds, and then enter “T1”,
the resulting display is nominally “N V0.1000K”
