225 Series User’s Manual
3
118120-001-Rev. A
THIS UNIT CONTROLS HAZARDOUS
VOLTAGES. DO NOT APPLY INPUT
POWER UNLESS ADEQUATE
GROUNDING IS PROVIDED TO THE
POWER SUPPLY AND THE HIGH
VOLTAGE OUTPUT HAS BEEN
PROPERLY CONNECTED.
THE DATA CONTAINED IN THIS MANUAL IS
SUBJECT TO CHANGE WITHOUT NOTICE.
WRITTEN PERMISSION FROM SPELLMAN HIGH
VOLTAGE IS REQUIRED PRIOR TO THE
REPRODUCTION OF ANY TECHNICAL DATA
CONTAINED IN THIS MANUAL.
SECTION I: INTRODUCTION
1.0
SCOPE OF MANUAL
This manual is provided to assist the user in the
installation and operation of the Spellman Series 225,
IEEE-488 (GPIB) programmable high voltage power
supplies. Statements apply to all models in the Series
unless reference is made to specific models. For the
protection of personnel and equipment, it is essential that
this manual be thoroughly read prior to the installation
and application of power.
1.1
PURPOSE OF EQUIPMENT
The series 225 is a family of regulated precision
regulated, GPIB programmable high voltage power
supplies. They offer exceptional performance in such
critical applications as nuclear and electro-optical
instrumentation, medical imaging and capillary zone
electrophoresis and precision CRT displays.
1.2
DESCRIPTION
The units are fully enclosed and designed to mount in a
standard 19” rack. A wide range of stable output
voltages from 500V up to 50 kV is available. The output
voltage is set either by front panel controls or on the
IEEE-488 interface. Intelligent programming,
monitoring and automatic overload protection of the
power supply are provided. Remote analog voltage or
resistance programming and remote analog monitoring
are provided on all models.
Output polarity reversal is achieved by turning a polarity
switch on the rear panel of 500V, 1kV, 3kV and 5kV
models. The 10kV and higher output models have an
internal polarity reversing assembly that is easily
accessible in the field. NOTE: in either case, polarity
reversal MUST ONLY BE DONE WHEN THE HIGH
VOLTAGE IS OFF.
The Series 225 units contain a DC power supply that
converts the AC line power to a low voltage DC and a
DC-to-DC converter that generates the high DC voltage.
Low voltage electronics solid-state circuits (analog and
microprocessor-controlled circuits) are placed on plug–in
printed circuit boards. The high voltage assembly is fully
encapsulated in silicone rubber for reliable, arc- free,
stable operation.
SECTION II: 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
2.1
INSTALLATION:
The 225 Series high voltage power supplies mount in a
standard 19” rack.
2.2
INPUT POWER
The input AC line voltage required is 115V/230VAC,
±10%, 50-400Hz, single phase. The LINE VOLTAGE
selector switch on the rear panel MUST BE SET for
either 115VAC or 230VAC BEFORE application of input
power.
2.3
POWER ON/SELF TEST
When AC power is first applied, the unit will
automatically illuminate all of its LED segments in the
front panel display for user inspection. Then it will
display its configuration as shown in the EXAMPLE 2.1
below
DISPLAY EXAMPLE 2.1
“+225.0.5” 225-0.5R set to positive output polarity
“-225.30” 225-30R set to negative polarity
While the above is being displayed, the unit performs a
series of power-on self-tests. If the internal self-check
detects a failure, that failure will be displayed as one of
the following error messages:
E r r 1
μP RAM
error
E r r 2
μP ROM
error
E r r 3 μP A/D error
The above messages are also available via the IEEE-488
interface. (See Section 3.2.2). If no error is found, the
unit will commence displaying voltage readings.