SECTION 1
GENERAL
6
1.3.1 UPC DESCRIPTION (continued)
A Programmable Current limit value can be set.
A unique control feature available within the UPC is TRANSITION TIME (
). When Transition
Time is set to a non-zero value (0 to 300 Sec. in increments as small as 200 uS), any change of the
voltage or frequency, whether by executing a new Program or by Manual or Remote command, will take
the specified time to transition to the new voltage and frequency. This is useful when abrupt changes to
the output power signal are undesireable. This feature does not affect transient operation.
Waveform analysis functions can be optionally provided to report both magnitude and phase angle of each
harmonic for metered voltage and current waveforms. THD, ODD and EVEN harmonic distortion
measurement data is also reported.
The Programmable Outpout Impedance option (ProgZo), also known as Current Compensation, provides
the ability to compensate for dynamic losses in the output circuit by controlling the output impedance of the
power source and responding in real-time to changes in the output current.
The UPC may be used in Local (front panel) or Remote (GPIB or SERIAL) control. The GPIB interface is
IEEE-488.1, IEEE-488.2 and SCPI compatible. A Serial port interface is available as an alternative remote
interface and commands are IEEE-488.2 and SCPI format compatible.
Metered voltage and current digitized waveform data can be retrieved via the remote interface.
1.3.2 CONTROLLER MODELS
The term 'UPC' is derived from Universal Programmable Controller.
The UPC-32 is a 3 phase (
Ф)
signal generator designed to operate any PACIFIC power source which is
1
Ф
/ 2
Ф
/ 3
Ф
capable.
The UPC-12 is identical in characteristics to the UPC-32, except that it produces only one output signal. It
is designed to plug in to any single-phase-only PACIFIC AMX or ASX model power source.
1.3.3 SCU DESCRIPTION
The System Control Unit is a
19” W x 5.25”H x 7” D (48.26cm x 13.33cm x 17.78cm) rack-mount style
chassis with a power supply and connector interfaces, to support a UPC. This allows the UPC to operate
independently from the power source.
The SCU provides a suitable housing for the controller for applications requiring a controller remotely
located from the power source. The complete designation for a "stand-alone" controller housing a UPC-32
is SCU/UPC-32. Such a unit can drive some of the larger PACIFIC power sources through their remote
interface. A typical usage might be: to locate the power source at the base of an instrument rack, with the
controller installed in an upper slot at a more convenient eye level or even in a completely different location.
