TTi PLH120-P – Single Higher Voltage DC Power Supply, 0-120V/0-0.75A, Analog

• PLH120-P Single Higher Voltage DC Power Supply, 0-120V/0-0.75A, Analog
• High performance linear regulated power supplies
• Full digital remote control and readback
• RS-232, USB and LAN (Ethernet), GPIB optional
• LAN Interface conforms with LXI standard

The PLH-P Series is the bus programmable version of the latest linear regulated power supply series from TTi. The PLH-P series includes all of the manual control features of the PLH series, but adds comprehensive remote control facilities. 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.

Higher Voltages Without Lower Performance

The PLH series is a development of the best-selling New PL series of laboratory bench power supplies which is available in 15V, 30V and 60V variants (covered in a separate brochure and on our web site).

The PLH series retains the ultra compact format, high power density, and smart analog controls of the PL series but offers voltages up to 250V to cover applications beyond the capabilities of standard bench PSUs and into areas such as magnetics.

TTi has been at the forefront of laboratory power supply design for around thirty years during which it has re-defined the state-of-the-art for switch mode products with its innovative Mixed-mode and PowerFlex regulator designs. Demand for linear regulated PSUs has remained strong and continuing development of linear models has generated the lower cost ELR series, and the advanced QL series in addition to the ever popular PL series. The PLH and PLH-P series of linear regulated higher voltage dc power supplies joins a large family of PSUs with power levels from 15 watts up to 1200 watts.

Analog Controls with Digital Stability

As technology has changed, many products have moved from analog controls to digital ones. Although digital controls suit many instruments, they do not necessarily suit a bench power supply. Customer research shows that many users prefer the speed and simplicity of conventional analog controls for setting voltage and current. Digital controls may offer greater precision, but often at the expense of ease-of-use. With this in mind, the New PL series has retained the true analog controls of its predecessor.

The main disadvantage of analog controls is stability and security. The settings of analog potentiometers can drift over time. More importantly, the settings can be changed accidentally with potentially serious consequences.

The New PL series introduces S-Lock. One press of the Lock button transfers control of voltage and current from the analog controls to internal digital circuitry. This offers not just complete security, but exceptional stability as well with each setting controlled by an instrumentation quality DAC.

Linear Regulation for Ultra-Low Noise

Linear regulation still offers the lowest output noise and the best transient response (recovery time from a sudden current step).

Despite the high output voltages, the PLH series maintains output noise figures of below 2mV, and transient recovery times of better than 250μs. In addition, the lack of a high frequency switching circuit reduces radiated noise and common mode signals enabling the PLH series to be used in sensitive environments.

Choose a Voltage Range that Suits Your Task

When working with any particular piece of equipment, engineers often require a voltage source variable over only a narrow range. Set the voltage too high and damage might occur, set it too low and the circuit may reset. That’s where the V-Span function of the New PLH series comes in. It allows the user to redefine the end-stop values of the voltage control to define a specific voltage range.

For example:

An engineer is working on a circuit that will eventually operate from a peak rectified 110V rms ±5% supply. They use V-Span to set a Vmax of 164 volts (to prevent over-voltage damage) and a Vmin of 147 volts (to ensure that the circuit doesn’t reset). They now have a power supply which provides high resolution analog control over the exact voltage range they need. Vmin and Vmax can be set anywhere between zero and maximum output voltage subject only to Vmax > (Vmin + 0.1V). The fine control gives additional adjustment of ±1%.

Once set, the voltage span function can be turned on or off at the press of a button*.

Ultra Compact Using Minimum Bench or Rack Space

Ultra-Compact Design with Higher Power Efficiency and Near-Silent Cooling

The PLH series achieves an exceptional power density for a linear regulated power supply by offering up to 94 watts from a ¼ rack 3U sized casing. 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 PLH series generates 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 voltages below maximum. The internal heat-sinks use fan-assisted convection cooling in order to remove the heat with minimal fan noise.

Bench and System Use

The PLH-P series includes all of the manual control features of the PLH series, but adds comprehensive remote control facilities. 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.

Rear Power Terminals

Power output terminals are duplicated on the rear panel for rack mount applications or other situations where rear connection is more appropriate.

Digital Remote Control

To meet the varying needs of today’s 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.

RS-232

An RS-232/RS-423 interface is provided for use with legacy systems. This type of serial interface remains in common usage and is perfectly satisfactory for the control of power supplies because data speed is not an issue.

USB

USB provides a simple and convenient means of connection to a PC and is particularly appropriate for small system use. A USB driver is provided which supports Windows operating systems from Windows 2000 onwards.

LAN-Ethernet with LXI

The LAN interface uses a standard 10/100 base-T Ethernet hardware connection with ICMP and TCP/IP Protocol for connection to a Local Area Network or direct connection to a single PC. This interface supports LXI and is the most appropriate for larger system use because of its scalable nature.

LXI Compliance

The LAN interface is compliant with LXI-C. LXI (LAN extensions for Instrumentation) is the next-generation, LAN-based modular architecture standard for automated test systems managed by the LXI Consortium, and is expected to become the successor to GPIB in many systems.

GPIB (option G)

Further versions of the products which are fitted with a GPIB (IEEE-488) interface in addition to USB, RS232 and LAN.

IVI Driver

An IVI driver for Windows is included. This provides support for common high-level applications such as LabView*, LabWindows*, and HP/Agilent VEE*.

PLH-P Additional Facilities

From the front, PLH-P models are identical to standard PLH models and retain all of their manual control features.

The rear panel carries RS-232, USB and LAN (Ethernet) connectors, together with isolated analog in and non-isolated out for voltage and current, plus remote on/off control. Power output terminals are also duplicated on the rear panel.

All models can be additionally fitted with a GPIB interface (option G – factory fit only).

Isolated Analog Remote Control

PLH-P units include isolated analog voltage control of both voltage and current. Analog control outputs (non-isolated) are also incorporated to enable easy parallel connection of multiple units in a master-slave configuration. Terminals for remote on/off control are also provided.

Rack Mounting

Up to four single output units can be fitted into one rack width. Alternatively, where PLH units are being used along side New PL units, a combination of singles and duals can be used i.e. one dual plus up to two singles.

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