Information

CPX400S - Single Output 420W
PowerFlex design gives variable voltage and current
combinations within a maximum power envelope
Up to 60V and up to 20A per output (420W maximum)
Constant voltage or constant current operation
Low output noise and good transient response
PowerFlex or fixed-range operation plus custom limits
True analogue controls with digital settings locking
Independent outputs or isolated voltage tracking (dual)
Outputs can be wired in series or parallel for 120V or 40A
Variable OVP trips; safety binding-post terminals
4 digit fixed resolution meters; selectable remote sensing
Compact ½ rack 3U case (dual) or ¼ rack 3U case (single)
Duplicate terminals at rear on CPX400SA, SP & DP
Isolated analogue control interface (CPX400SA only)
GPIB, RS-232, USB and LAN interfaces with LXI compliance
(CPX400SP & CPX400DP only)
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Low noise and good dynamic response
The PowerFlex regulation system used on the CPX400 series combines a high
frequency pre regulator with a linear post regulator to give both low noise
and good transient response. Each output can operate in constant voltage or
constant current mode with automatic crossover and mode indication.
Precision metering and remote sense
Separate voltage and current meters on each output give a resolution of 10mV
and 10mA. The fixed resolution avoids the misinterpretation of readings that
can occur with auto-ranging 3 or 3½ digit meters where the decimal point
position moves as the reading changes.
Coarse and fine voltage controls are provided. The current control is
logarithmic enabling low current levels to be set accurately. A View Settings
button enables limit settings to be checked and adjusted at any time.
Each output incorporates remote sense terminals that can be enabled or
disabled at the flick of a switch. Remote sensing is essential for maintaining
precise regulation at the load and true metering of the load voltage.
Compact design uses minimum bench or rack space
Despite the high power output of 840 watts, the CPX400D & DP has a small
bench footprint taking up less space on a crowded bench.
For rack-mount applications the half-rack by 3U case size enables two units
(providing four outputs) to be fitted into a single rack slot.
Range control offers even more flexibility
As an alternative to PowerFlex operation (60V/20A subject to a power limit),
the CPX400 series can be used as conventional fixed range power supplies of
either 60V/7A or 20V/20A at the press of a button.
Fixed range mode ensures that, whatever the load, the output can only
be in constant voltage or constant current mode and never in power limit.
Additionally finer resolution is provided on the current or voltage controls
respectively.
A further button offers full customisation of voltage and current limits which
can be set to suit the users application. This has the advantage that the
controls cover the exact voltage and current range required, providing easier
setting and reduced risk of error.
For example, the range could be set to 30V and 14A to create a 30 volt PSU of
maximum current capability. Alternatively it could be set to 5V and 3A if this
was all that was required for a particular application.
Single output, ultra compact design
The CPX400S is a single output version of the CPX400D providing up to 60 volts
and 20 amps within its 420 watt power envelope.
It is housed in a ¼ rack width 3U high case that uses the minimum possible
space for either bench use or rack mounting.
Three variants
The single output version of the CPX400 is available in three variants. The
CPX400S has manual control only, for conventional bench-top use. The
CPX400SA adds isolated analogue remote control plus duplicate rear terminals.
The CPX400DP has digital remote control via USB, RS-232, GPIB and LAN (LXI)
along with duplicate rear terminals (see next page).
CPX400SA - isolated analogue remote control
Some applications require analogue remote control rather than digital. The
CPX400SA has fully galvanically isolated voltage driven remote control
for both voltage and current. In addition, voltage and current front panel
settings are provided as non-isolated control voltages, enabling master-slave
configurations to be used.
CPX400SP - digital remote control
(see next page)
Safety binding-post terminals
All CPX series power supplies are fitted with the new TTi designed output
terminals. As well as acting as conventional binding posts for bare wires,
spade connectors, or standard 4mm plugs, these can accept a 4mm safety plug
with rigid insulating sleeve, a requirement specified by an increasing number
of laboratories for safety reasons.
Limited opening length
combined with raised insulated
shoulders also make these
terminals “touch proof” for
voltages up to 250V.
New CPX400SP single output with digital remote control