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The QPX750SP is a single output DC power supply with a maximum output power of 750 watts. It is suited to both bench-top and system applications.
THE QPX SERIES
QPX series laboratory power supplies are designed to provide flexibility in the choice of voltage and current so as to meet multiple diverse applications. Voltages up to 80V and currents up to 50A are available within a defined power envelope. Unlike most power supplies of this power level, the QPX series is well suited to bench top applications in addition to system use.
POWERFLEX & POWERFLEX+
A conventional PSU has a fixed current limit giving a power capability that reduces directly with the output voltage. The Aim-TTi PowerFlex and PowerFlex+ regulation systems enable higher currents to be generated at lower voltages within an overall power limit envelope. For PowerFlex+ models the output can provide more than six times the current of a conventional PSU of the same maximum voltage and power. For PowerFlex models the increase is three times.
LOW RIPPLE AND NOISE
PowerFlex and PowerFlex+ use either a balanced multi-phase converter system or linear final regulation to minimise ripple and improve dynamic performance. This provides unusually low noise for thepower level coupled with good transient response.
POWER CALCULATION
The meter for each output can be set to show the total power currently being provided to the load (V x A) to a resolution of 0.1 watts. The power is shown in addition to the voltage and current values.
CURRENT METER AVERAGING
When measuring rapidly varying loads it can become difficult to get accurate readings from the current meter. By selecting meter averaging, the reading is stabilised by averaging the last four readings to reduce the speed and extent of the variation.
Key Features
Wide range of voltage/current combinations
Up to 80V and up to 50A within the same power envelope
Low output ripple and noise of <3mV rms at full power
High setting resolution of 1mV
Analogue control interfaces for voltage and current
Bench or rack mounting, front and rear terminals
LAN (LXI), USB, GPIB interfaces (GPIB optional on QPX750SP)
Key Benefits
OVP AND OCP TRIPS
Variable trips for over-voltage and overcurrent are provided on each output. Unlike a limit setting, the trip setting turns the output off and provides a different level of protection.
For example, when repetitively testing a unit which normally takes a peak current of 10A, the current limit could be set to 11A and the OCP to 10.1A to ensure that a faulty unit will trip the supply off and not be damaged by over dissipation. The output trip can also be activated by other fault conditions including over temperature and remote sense mis-wiring. The cause of the trip is shown on the display.
LOW RESISTANCE CALCULATION
The meter for each output can be set to show the equivalent resistance of the load by displaying voltage divided by current. This function enables low resistance measurements to be made at high currents by using the remote sense terminals to create a four terminal connection. This gives more reliable results for certain component types, such as magnetics, which operate at ampere levels.
QUASI ANALOG CONTROL
All models incorporate analog interfaces for voltage control of both output voltage and output current (non-isolated). An isolated logic control signal is provided for control of output on/off. An isolated open-collector logic output signal is also available. This can be menu selected as true or false for output enabled or disabled, current limit, power limit, or any fault trip.
SELV MODE
QPX750SP provides an added safety feature where voltages above 50V require authorisation from the user.
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Specifications
VOLTAGE/CURRENT LEVELS
Voltage Range:
Range 1 – 0V to 50V
Range 2 – 0V to 80V
Current Range:
10mA to 50A
Power Range:
Up to 750W
OUTPUT SETTING
Operating Mode:
Constant voltage, constant current or constant power with automatic cross-over dependent on output setting parameters CV, CC or CP mode
indication in display
Voltage Setting:
By floating point numeric entry or rotary jog wheel.
Resolution- 1mV for 50V range, (2mV for 80V range).
Current Setting:
By floating point numeric entry or rotary jog wheel; Resolution 10mA.
Setting Accuracy:
Voltage- 0.1% ± 2mV on 50V range,
(0.1% ± 4mV on 80V range)
Current – 0.3% ± 20mA.
OUTPUT PERFORMANCE
Load regulation
<0.01% +5mV (CV mode) for any load change within the PowerFlex envelope,using remote sense.
Line regulation:
<0.01% +5mV for a 10% line voltage change.
Ripple & Noise: (20MHz bandwidth
Typically <3mV rms, <20mV pk-pk.
Transient Response:
To within 100mV of set level for a 5%
to 95% load change.
Rear Terminals: <2ms
Front Terminals: <2.5ms
Sensing:
Selectable local or remote sensing.
Output Protection:
Output will withstand forward voltages of up to 90V.
Reverse protection by diode clamp.
