Aim-TTi QL355TP SII - Bench/System High Precision DC Power Supply, Linear Regulation, Digital Control 2 x 35/3A or 15V/5A plus 1-6V/3A, USB/RS232/GPIB/LAN

The QL Series II is the latest and highest performance linear regulated power supply series from TTi. Single and triple output models are available. Each model can be specified with or without digital remote control interfaces. Each main output provides more than 100 watts of power, and dual range capability offers higher currents at lower voltages.

New features include an enhanced auxiliary output with fully variable voltage and higher current capability on T models, and an LXI compliant LAN interface on all P models.
 

Linear Regulation With More Than 100 Watts Per Output

Building Upon Success

The original QL series re-defined the laboratory power supply in terms of precision and performance. Now the QL Series II builds upon that success and adds new features and models.

Exceptional Precision

The QL series offers an unparalleled level of precision. Voltage and current are controlled using instrumentation quality 16 bit DACs enabling voltages to be set to 1mV resolution even at full output voltage. Indeed, the accuracy is sufficient for the QL to be used as a calibration source for some hand-held DMMs.

Multiple Ranges for Greater Flexibility

The QL series II provides multiple ranges for increased current capability at lower voltages. The QL564, for example, is a 112W PSU with three ranges. The main range offers 0 to 56 volts at up to 2 amps. The higher current range provides up to 4 amps for voltages up to 25V. A further low current range provides an enhanced current setting and measurement resolution of 0.1mA.

Unrivalled Performance

The QL series uses pure linear technology and offers unrivalled performance in terms of regulation, output noise and dynamics. Line and load regulation are close to the limit of measurement. Recovery time from transient current pulses is better than 50μs.

Differential output noise is less than 350μV rms in CV mode and down to 20μA rms in CI mode. Of equal importance for critical applications in areas such as telecoms is common mode noise current (the noise current flowing between the output terminals and ground). This is less than 4μA rms on the QL Series - dramatically better than most other PSUs.
 

Exceptional Facilities and Performance

Fast, Simple and Safe to Use

The user interface of the QL series has been painstakingly designed to provide rapid control whilst guarding against any possibility of error. Unlike other digitally controlled units, the QL series provides both numeric and rotary control. Illuminated keys and display legends provide instant confirmation of settings and status. Voltage and current setting can be performed in either of two ways:

Direct Numeric Entry

Settings can be made by direct numeric entry using the 0 to 9 keypad. Each new setting is previewed on the display and must be confirmed with the OK key. Settings recalled from memory are similarly previewed and confirmed. Numeric setting is very fast requiring only three key presses to set to 5 volts, for example, (V, 5, OK). To set a more precise level such as 12.725 volts requires more key presses, but can still be done in seconds.

Incremental Rotary Control

For those preferring quasi-analogue control, or for applications where the voltage or current must be gradually changed, the Jog wheel is available. The wheel has a positive stepped action but can be spun rapidly when required. Output voltage can be incremented or decremented in steps of 0.1V, 10mV or 1mV. Current steps can be selected from 0.1A down to 0.1mA. The Jog function can be left permanently engaged or can be disabled at the touch of a button.

Instant Limits View

To enable the current limit to be set before connecting the load, the limit setting is displayed when the output is set to Off. Pressing the Limits key at any time provides a temporary display of the limit values allowing precise adjustment to be made.

Setting Memories for Added Convenience

The QL Series II provided storage of up to 50 power supply sets-up in nonvolatile memory (160 set-ups for a triple). Voltage, current, OVP and OCP are all saved. An further power-down memory is also incorporated. Upon mains switch-off, the set-up of the PSU is saved and is automatically restored at switch-on. On the triple output models, independent memories are provided for each output, plus an additional set for ‘linked’ mode where the user may wish to recall settings for both outputs simultaneously.

Remote or Local Sense

The QL series provides full remote sense capability via dedicated sense terminals. Remote sense is essential to maintain regulation at the load (two 0.01 Ohm connection leads will drop 100mV at 5 amps). When remote sense is not required, internal local sensing can be selected at the touch of a button.

OVP and OCP Trips with “Alarm” Output

The QL series provides fully adjustable over-voltage and over-current trips. These trips can be used both as a fail-safe against accidental mis-setting and as a protection against inappropriate load conditions. In addition to turning the output off, a trip condition switches the rear panel alarm signal enabling other equipment to be controlled. For complete protection of the power supply, the trip will also be operated by over-temperature, or excess voltage on the sense terminals.

Instant Watts Display

The product of voltage and current can be displayed at any time by pressing the V x A button. The power is displayed with a resolution down to 1 milliwatt.
 

Further Facilities - Triple Output Models

These triple output models have two main outputs plus one auxiliary output. The casing is twice the width of a single output model (two-thirds rack).

Linked Mode Convenience

The triple output models have two identical outputs which are both independent and isolated. Illuminated keys selects which output is to be adjusted and provide unambiguous indication. In situations where the user wishes to set similar voltages or currents on both outputs, “linked” mode is available. When linked, all adjustments are applied to both outputs simultaneously.

Auxiliary Output for Low Voltage Circuits

The triple output models incorporate a third “auxiliary” output intended for powering logic and other low voltage circuitry. This output is fully isolated from the main outputs and provides a fully variable voltage of between 1.00 and 6.00 volts at a current of up to 3 amps.

Voltage and current can be read on the main display at the touch of a button. An independent output on/off switch is provided. On P versions, voltage and on/off status are bus controllable, and output current and status can be read-back.

Note that, unlike the main outputs which are pure linear, the auxiliary output incorporates a switch-mode down converter.

Comprehensive Output Control

Each output has its own illuminated dc on/off key providing completely independent control. For situations where power needs to be connected or disconnected from all three outputs together, master on/off keys are also provided.

Comprehensive Remote Control (QL-P)

GPIB

The GPIB interface is compliant with IEEE-488.1 and IEEE-488.2. Currently GPIB remains the most widely used interface for system applications.

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 2000, XP , Vista and Windows 7. Further versions will be supported as they are released.

LAN (Ethernet)

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 highly appropriate for system use because of its scalable nature and low cost interconnection.

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. For more information on LXI and how it replaces GPIB, or operates along side it.

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*.

Digital remote control

To meet the varying needs of today’s engineers, a comprehensive array of interfaces is provided. RS-232, USB, GPIB and LAN (Ethernet) with LXI support are provided as standard. 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.

Compact Design for Bench or Rack

The QL series are highly compact with a small footprint for bench use. Fold-away feet are incorporated which can be used to angle the front panel upwards. Single output models are one-third rack width, whilst triple output models are two thirds rack width. A universal rack mount tray is available which will mount one, two or three singles, one triple, or one triple plus one single. On P versions, rear output terminals are provided for system use.