• 35V/3A or 15V/5A
• QL355 SII Single 0-35V/0-5A Linear Regulated Precision Power Supply
• Advanced dc power supply range, single or triple output
• Very high precision, very low noise, excellent dynamics
• Advanced user interface with numeric and rotary control

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.

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.

• Advanced dc power supply range, single or triple output
• Very high precision, very low noise, excellent dynamics
• Advanced user interface with numeric and rotary control
• Multiple voltage/current ranges for increased flexibility
• Multiple non-volatile memories for power supply set-ups
• Switchable remote sense provides perfect load regulation
• Comprehensive protection including OVP and OCP trips
• Compact bench footprint; modular width for rack mounting
• Auxiliary output fully variable 1.00V to 6.00V at 3A
• with selectable voltage and current metering (T models)
• Bus programmable via USB, RS232, GPIB or LAN (P models) LAN interface is LXI class C compliant
• Duplicate power and sense terminals at rear (P models)

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.