Datasheet

New PL Series
Analog control for a digital world
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 simplic-
ity 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 con-
trols 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 conse-
quences.
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).
Most linear regulated power supplies offer low output noise with figures
below 2mV rms being typical.
The New PL series goes a stage further and
an rms noise figure of 0.4mV with tightly
specified pk-pk noise and common-mode
current figures.
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 PL 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 four NiMh cells.
They use V-Span to set a Vmax of 5.8 volts (to prevent
over-voltage damage) and a Vmin of 3.6 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*.
Building on the success of a winning formula
In the 1980s the original PL series transformed customer expectations of
the bench power supply and set a
format that has been extensively
copied by other manufacturers.
Over the years, the PL series
has been steadily revised and
extended. Hundreds of thousands
of PL series units are currently
in use across the world and it
remains the laboratory power
supply of choice for many
organisations.
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.
Continuing development of linear models has generated the lower cost
EL series, and the advanced QL series. However, demand for the PL
series has remained strong - demonstrating how well it has met the
needs of its many customers.
Now TTi has engineered an all-new design which retains all the key
features of the original PL series, but combines them with new and
important features.
Analog controls with digital stability
Lock your settings
at the touch of
a button !
New PL series - advanced linear regulated laboratory power supplies