Specifications

204
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.