Technical data

72 APPLICATIONS INFORMATION
Power Products Terms (cont’d)
Ripple and Noise (dB): a term often used to specify rms or
peak ac source noise relative to the maximum rms or peak
output rating. The specification is calculated as follows:
dB = 20 Log (Vnoise/Vrating).
Rms (or effective) amplitude or noise: an average signal or
noise level based on energy content. The root mean square
(rms) content is often called the ac component.
SCPI (Standard Commands for Programmable Instruments):
is a programming language for controlling instrument
functions over the GPIB (IEEE 488) instrument bus.
The same SCPI commands and parameters control the
same functions in different classes of instruments.
SCR regulated supplies: power supplies designed with this
topology are very efficient and have moderate noise
specifications. They are often used for industrial
applications.
Serial link: a means by which up to 16 power supplies with
this feature can share one GPIB primary address. The
power supplies can be connected with cables similar to
U.S. modular telephone cables. They are independently
controlled using GPIB secondary addressing.
Series regulation: power supplies designed with this
topology have fast programming speeds and low noise.
Also referredto as a “linear” topology.
Slave operation: see “master-slave operation”.
Slew rate: for any given electronic load input transition, the
change in current or voltage over time.
Source effect: also known as “line regulation”, source effect
is the change in the steady-state value of the stabilized out-
put or input voltage or current resulting from any change
in the ac source voltage within its specified range, with all
other influence quantities maintained constant. Source
effect may be measured at any output or input voltage and
current within rating.
Specifications: describe the power supply or electronic load
warranted performance.
Supplemental characteristics: give typical but nonwarranted
performance parameters.
Switching regulation supplies: power supplies designed with
this topology are efficient and can have laboratory-grade
specifications.
Temperature effect coefficient: the maximum steady-state
change in a power supply’s output voltage or current
or electronic load’s input voltage or current per degree
Celsius following a change in the ambient temperature
within specified limits, with all other influence quantities
maintained constant.
Total harmonic distortion: the ratio of the rms sum of the
harmonic components to the rms value of a periodic
waveform. This is typically expressed as a percent or in
decibels (dB).
Voltage limiting: the action of limiting the output voltage of a
constant-current supply to some predetermined maximum
value (fixed or adjustable) and automatically restoring the
output current to its normal value when the load conditions
are restored to normal. There are two types of voltage limiting:
•
by constant voltage/constant current crossover
•
by decreasing the output current as the voltage increases
Warm-up time: the time interval from when a power supply or
electronic load is turned on until its output complies with all
performance specifications.
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