Product specifications

140
Power Products Power Products Terms (Continued)
Applications Information
More detailed specifications at www.agilent.com/find/power
RI (discrete fault indicator/remote inhibit):
a rear-panel port that can be used
to disable the power supply output
independently of the GPIB. This port
can also be used to chain multiple
power supplies together such that
an emergency shutdown of one out-
put automatically signals the other
supplies to disable their outputs.
Ripple and noise (dB): a term often
used to specify rms or peak AC
source noise relative to the maxi-
mum rms or peak output rating.
The specification is calculated
as follows: dB = 20 Log
(V
noise
/V
rating
).
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 Program-
mable 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.
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 indepen-
dently controlled using GPIB
secondary addressing.
Series regulation: power supplies
designed with this topology have
fast programming speeds and low
noise. Also referred to 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 output or input volt-
age or current resulting from any
change in the AC source voltage
within its specified range, with all
other influence quantities main-
tained 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 perfor-
mance parameters.
Switching regulation supplies: power
supplies designed with this top-
ology 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 speci-
fied 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 automati-
cally 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.