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PL303QMD Dual 0-30V/0-3A LXI/RS232 Analogue Power Supply

This Dual analogue Power Supply achieves an exceptional power density for a linear regulated power by offering up to 90W from a ¼ rack 3U sized casing.

Up to four single output units can be fitted into one rack width. Alternatively, any combination of singles and duals can be used - as in the example shown.

The TTi RM450 rack mount (shown) is 4U high and incorporates limited ventilation space above and below the power supplies. Blanking plates are provided for unused positions.

This gives it an unusually small bench footprint taking up less space on a crowded bench. For rack-mount application, up to four units can be mounted into a single slot. Despite its small size and linear regulation, the TTi Dual analogue Power Supply produces relatively little heat through the use of an advanced phase controlled pre-regulator. This gives it significantly higher energy efficiency than conventional linear regulated designs, particularly when supplying lower voltages.

The internal heat-sinks use fan-assisted convection cooling in order to remove the heat with minimal fan noise.
The ultra-compact rack-modular sizing makes it ideally suited to rack mounted system applications, while its user-friendly manual controls are retained for bench top applications.

To meet the varying needs of todays engineers, a comprehensive array of interfaces is provided. RS-232, USB and LAN (Ethernet) with LXI support are provided as standard. An additional GPIB interface is also optionally available.

Each of the digital bus interfaces provides full control of voltage, current, and output On/Off, plus read-back of voltage, current and status. The interfaces are at ground potential and are opto-isolated from the output terminals.

  • High performance linear regulated power supplies
  • Full digital remote control and read back
  • RS-232, USB and LAN (Ethernet)
  • LAN Interface conforms with LXI standard
  • Interfaces are opto-isolated from outputs
  • IVI Driver supplied
  • Analog remote control of V and I (non-isolated)
  • Analog outputs for easy master-slave parallel wiring
  • Ultra-compact size of quarter-rack 3U
  • High power density - up to 90W per output
  • Wide model range; single and dual outputs
  • Manual control features as per New PL Series
  • Manufacturers part no. TTi PL303QMD

Product details Hints & Tips






Manufacturer’s Part Number: PL303QMD

PL303QMD Dual 0-30v/0-3a Analogue Power Supply


In stock, despatched same day

Technical Specification

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Main Output(s)
Output range: 0 to 32V at 0 to 3.1A
Voltage setting:12-bit resolution (10mV steps)
Current setting:12-bit resolution (1mA steps)
Setting accuracy:Voltage: ±(0.1% + 10mV) Current: ±(0.2% + 2mA)
Output mode:Constant voltage or constant current modes with automatic cross-over
Output switch: Electronic by interface command (front panel output switches must be set to ON)
Readback resolution: Voltage: 10mV over entire range Current: 1mA over the entire range
Readback accuracy: Voltage: ±(0.1% of reading +1 digit) Current: ±(0.3% of reading +1 digit)
Current meter
Damping:Nominally 20ms switchable to 2 sec and back by remote commands
Output terminals:4mm terminals on 19mm spacing
Output impedance:Constant Voltage: Typically <5mW at 1kHz; Constant Current: Typically 50kW
Output protection:Max. output voltage +20V forward; diode clamped for reverse, up to 3A reverse current
Load regulation:<0.01% of max. output for 90% load change
Line regulation:<0.01% of max. output for 10% line change
Remote sense:Eliminates up to 0.5V drop per lead.
Ripple and noise:Typically <1mV rms
Transient response:<20usec to <50mV for 90% load change
Temp. coefficient:Typically <100ppm/°C
Meter type:Dual 4 digit with 12.5mm LEDS
Reading rate:4 per second
Logic output - PL330TP
Voltage range:4V to 6V in 10mV steps
Output current:1A to 7A in approximately 1A steps
Setting accuracy:Voltage: ±(0.2% + 10mV)
Output switch:Electronic by interface command (front panel output switch must be set to ON)
Readback resolution:Current: 10mA
Readback accuracy:Current: ±(0.5% of reading + 1 digit )
Output protection:Over-voltage protection operates above 7V; Diode clamped for reverse currents up to 3A
Load regulation:<0.01% of max. output for 90% load change
Line regulation:<0.01% of max. output for 10% line change
Remote sense:Eliminates up to 0.5V drop per lead.
Ripple and noise:Typically <1mV rms
Temp. coefficient:Typically <100ppm/°C
Meter type:3 digit with 12.5mm LEDs. Reading rate 4/s
Remote control interfaces
RS232: Variable Baud rate (9600 maximum), 9-pin D-connector (female).
GPIB: Conforming with IEEE-488.1 and IEEE-488.2
Address selection: By rear panel DIP switch
Remote/local: Selected by front panel switch
Remote command response time: Interface: <15ms (single command, input buffer empty)
Output voltage - Up: Time constant typically 2ms, e.g. 10ms to settle <1% of a step change
Output voltage - down:Time constant determined by the discharge of the power supply output capacitor (47µF);
Output current: Typically 50ms to settle <10mA for a 1A change
Power requirements:110V, 120V, 220V or 240VAC 50/60Hz ±10%
Operating range:-5°C to +40°C, 20% to 80% RH
Storage range:-20°C to +60°C
Size:170(H) x 300(D) x 207(W)
Weight:6.5kg (PL330P), 12.5kg (PL330DP), 16kg (PL330TP)
Rack mount option:19 inch 4U mount for two PL330P or one PL330DP/TP. Anti-tamper cover for security
Electrical safety:Designed and manufactured to comply with IEC 348 and IEC1010-1.
EMC:Designed and manufactured to comply with EN50081-1 and EN50082-1


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