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OUTPUT SPECIFICATIONS (each output)
Voltage/Current/Power Levels
Voltage Range: 0V to 60V.
Current Range: 0A to 20A.
Note: Actual maxima for voltage and current are typically 1% greater
than the figures given above.
Power Range: Up to 420W per output subject to power envelope.
Power Envelope
The maximum current at any voltage settings is
limited by the power envelope which is set to give 7A at 60V rising
to 20A at 20V under all ac supply conditions (both outputs loaded).
At lower output voltages the power is restricted by the 20 amps
current maximum. 
See PowerFlex power envelope graph
Output Setting & Control
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Output Mode: Constant voltage or constant current with automatic
cross-over. CC indicator for constant current mode.
Output Switch: Electronic, non isolating. Preset voltage and current
limit displayed when Output is off.
Output rise time no load <10ms.
View Settings: With the output On, the meters show actual voltage
and current. The preset levels can be viewed and
adjusted at any time by pressing the View Settings button.
Status Indication: LED indication of Output On, V/I Limits, CV, CI,
Power Limit, Remote, LAN status.
Message on meter display for trip condition.
S-Lock (Settings Lock)
Voltage and current settings can be locked by a
single button press. Lock accuracy is equal to the meter accuracy
(see Meter Specifications).
Output Performance
Ripple & Noise: Typically <3mV rms, <15mV pk-pk,
in CV mode.
Load Regulation: Voltage - <0·01% of maximum output for any load
change within the PowerFlex envelope.
Current - <0·05% of maximum output for any load change within the
PowerFlex envelope.
Line Regulation: Voltage - <0·01% of maximum output for a 10% line
change.
Current - <0·01% of maximum output for a 10% line change.
Transient Response: <250µs to within 50mV of setting for a 5% to 95%
load change.
Temp. Coefficient: Typically <100ppm/°C
Output Protection
Output Protection: Forward protection by
Over-voltage Protection (OVP) trip.
Reverse protection by diode clamp for currents to 3A.
OVP Setting/Range: Via screwdriver adjustable preset on front panel.
Range 1V to 66V
Over-temperature: Output trips off for over-temperature.
Safety Interlocks: Operations that could cause an unexpected change
in voltage or current settings are interlocked
with the output switch.
Output Connections
Power Terminals: Universal 4mm safety binding
posts on 19mm (0·75”) spacing at front.
Screw terminals at rear
(CPX400SP, SA and DP only).
Remote Sense
Sense Selection: Voltage sensing is selected as Local or Remote by
front panel switch.
Sense Terminals: Sprung loaded screw-less terminals at front. Screw
terminals at rear (CPX400DP only).
METER SPECIFICATIONS (each output)
Display Type: Dual 4-digit meters, 10mm (0·39”)
LED.
Voltage Meter
Resolution/ Accuracy: 10mV / ± 0·1% of reading ± 2 digits
Current Meter
Resolution/ Accuracy: 10mA / ± 0·3% of reading ± 20mA
VOLTAGE TRACKING (Dual output models)
Independent Mode
In the normal mode of operation, each output is fully independent
and isolated. Operation is equivalent to two single output power
supplies.
Voltage Tracking Mode
The two outputs remain isolated, but the Slave voltage controls are
disabled and the Slave voltage is set equal to the Master voltage.
This can be used to generate tracking bipolar voltages, or tracking
unipolar voltages relative to different grounds.
When voltages greater than 60V are required, the outputs can be
wired in series to generate 0 to 120V with the voltage controlled
from the Master.
When currents greater than 20A are required, the outputs can be
wired in parallel to create the equivalent of a 40A power supply
with the voltage controlled from the Master.
Track Accuracy: Slave voltage = ± (0·1% of Master voltage setting +
10mV)
BOTH ON / BOTH OFF (Dual output models)
Each output has an independent DC On/Off
control, however, an additional control button is provided which
turn both outputs on or off simultaneously.
DIGITAL BUS INTERFACES (CPX400SP and CPX400DP only)
These models offers full remote control and
read-back using RS-232, USB, GPIB or LAN (compliant with LXI class
C).All interfaces are at ground potential and opto-isolated from the
output terminals. Note: Remote/Local Sense, is manually selectable
only.
RS-232
Standard 9-pin D connector. Baud rate 9,600.
USB
USB 2.0 connection (backwards compatible with USB 1.x). Operates as
a virtual COM port.
GPIB (IEEE-488)
The interface conforms with IEEE-488.1 and IEEE-488.2.
Ethernet (LAN)
Standard 10/100 base-T hardware connection. ICMP and TCP/IP Protocol
for connection to Local Area Network or direct connection to a
single PC.
LXI Compliance
LAN interface is compliant with LXI class C. (LXI is the
abbreviation for Lan eXtensions for Instrumentation). For more
information visit:
www.tti-test.com/go/lxi
DIGITAL PROGRAMMING PERFORMANCE
Voltage Setting
Resolution/Accuracy: 1mV / ± (0.05% +10mV)
Current Setting
Resolution/Accuracy: 1mA / ± (0.3% +5mA)
Programming Speed
Command Delay: Typically <25ms (this must be added to any of the
figures below)
Voltage Up Time: <10ms* to 1%
Voltage Down Time: <80ms* to 1% (full load); <1.5s* to 1% (no load)
* The up and down times vary with range and voltage step size. More
information is contained in the operating manual which can be
downloaded from our web site.
DRIVER SOFTWARE SUPPLIED
IVI Driver
An IVI driver for Windows is supplied. This provides support for
common applications such as LabView*, LabWindows*, HPVEE* etc.
USB Driver
An installation file is supplied which calls a standard Windows* USB
driver.
* LabView and LabWindows are trademarks of
National Instruments.
HPVEE (now Agilent VEE) is a trademark of Agilent Technologies.
* USB interface is supported for Windows 2000, XP, Vista and Windows
7.
Windows is a trademark of Microsoft.
ANALOGUE REMOTE INTERFACE (CPX400SA only)
The CPX400SA offers galvanically isolated
analogue remote control of voltage and current from control
voltages. Voltage and current front panel settings generate
non-isolated analogue output voltages that can be used to control
slave power supplies.
Input Scaling: 0 to 100% control of voltage or current from 0 to 5V
or 0 to 10V (selectable)
Input Accuracy: Voltage: 0.3% ±20mV. Current: 0.5% ±50mA. Input
impedance 10kOhms
Output Scaling: Set values of 0 to 100% of rated output voltage and
current generate 0 to 5V (not isolated)
Output Accuracy: Voltage: 0.3% ±20mV. Current: 0.5% ±50mA. Output
impedance 125Ohms
Remote On/Off: Output On/Off can be controlled by external switch
closure (not isolated)
GENERAL SPECIFICATIONS
Input
AC Input: 110 to 240 volts ±10% 50/60Hz. Installation Category II.
Input Power: 1250VA max.
Temperature & Environmental
Operating Range: +5ºC to +40ºC, 20% to 80% RH
Storage Range: -40ºC to + 70ºC
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree
2.
Cooling: Rear discharge variable speed fan.
Safety & EMC
Safety: Complies with EN61010-1
EMC: Complies with EN61326
Physical
Size: Single - 107 x 130 (¼ rack 3U) x 398mm; Dual - 210 x 130 mm (½
rack 3U) x 377mm
(size excludes feet, knobs and terminals).
Weight: Single - 4.25kg (9.35lb), Dual - 6.3kg (13.9lb))
OPTIONS
Rack Mount (RM300A)
19 inch 3U rack mount suitable for one or two dual power supplies.
Rack Mount (RM460)
19 inch 4U rack mount with above/below ventilation suitable for up
to 4 single or 2 dual power supplies (or mixture)
Accuracy specifications apply for the temperature range 18oC to 28oC
after one hour warm-up.
Thurlby Thandar Instruments Ltd. operate s a policy of continuous
development and reserves the right to alter specifications without
prior notice.
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