Introduction; Unmatched Precision, Unrivalled Performance; Multiple Ranges For Greater Flexibility; Fast, Simple And Safe To Use - TTI QL Serie Manual De Instrucciones

Unmatched Precision, Unrivalled Performance

The QL series represents the 'next generation' of laboratory power supplies offering an unparalleled
level of precision.
Voltage and current are controlled using 16 bit DACs enabling voltages to be set to 1mV resolution
even at full output. Indeed, the accuracy is sufficient for the PSU to be used as a calibration source
for most hand-held DMMs.
The QL series uses pure linear technology and offers unrivalled performance in terms of regulation,
output noise and dynamics. Line and load regulation are at the limit of measurement. Output noise
is less than 350µV rms in CV mode and down to 20µA rms in CI mode. Recovery time from transient
current pulses is better than 50µs.
The QL series provides full remote sense capability via dedicated sense terminals. Remote sense is
essential to maintain precise regulation at the load (two 0·03Ω connection leads will drop 300mV at 5
Amps). When remote sense is not required, internal local sensing can be selected at the touch of a
button.

Multiple Ranges for Greater Flexibility

The QL series provides multiple ranges for increased current capability at lower voltages. The main
range offers 0 to 35 Volts at up to 3 Amps (QL355) or 0-56V at up to 2 Amps (QL564). The higher
current range provides up to 5 Amps for voltages up to 15V (QL355) or 4 Amps for voltages up to
25V (QL564). A further low current range provides enhanced current setting and measurement
resolution of 0·1mA.
The product of voltage and current can be displayed at any time by pressing the VxA button. The
power is displayed to a resolution of 0·01 Watts.

Fast, Simple and Safe to use

The user interface of the QL series has been carefully designed to provide rapid control whilst
guarding against any possibility of error.
Voltage and current setting can be performed either by direct numeric entry or, for applications where
the voltage or current must be gradually changed, by using the quasi-analogue Jog control.
To enable the current limit to be set before connecting the load, the limit setting is displayed when
the output is off. Pressing the View Limits key at any time provides a temporary display of the limit
values allowing precise adjustment to also be made with the output on.

Setting Memories for Added Convenience

The QL series provides storage of up to 10 power supply sets-ups in non-volatile memory. Upon
mains switch-off, the set-up of the PSU is saved and is automatically restored at switch-on.

OVP and OCP Trips with 'Alarm' Output

The QL series provides fully adjustable over-voltage and over-current trips which 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.
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Introduction