HP 8590 E-Series User Manual page 337

clear-write mode
This is an analyzer function that clears the specified trace (A, B, or C) from the display, then
sweeps (updates) the trace each time trigger conditions are met. When trigger conditions
are met, the new input-signal data is displayed, then cleared, and the process begins again.
conducted emissions
Unwanted signals coupled onto the power or signal lines by a particular device.
command
A set of instructions that are translated into instrument actions. The actions are usually
made up of individual steps that together can execute an operation. Generally, for
spectrum analyzers it is a sequence of code that controls some operation of a spectrum
analyzer. These codes can be keyed in via a controller, or computer. Refer also to function.
continuous sweep mode
The analyzer condition where traces are automatically updated each time trigger conditions
are met.
CORR
Annotation indicating a corrected measurement condition exists. It appears when correction
factors are being applied to measurement results. If the CORR message is not displayed, the
measurements may not meet specifications.
correction factor
The factor by which a measurement reading must be multiplied to correct for the effects
of errors due to spectrum analyzer circuitry. This factor is the product of the ratio and
phase-angle correction factors for the existing conditions of operation.
CRT persistence
An indication of the rate at which the image fades on the display. In analyzers that digitize
the trace information (video) before writing it to the screen, the refresh rate is high enough
to prevent any flicker in the display; therefore, short-persistence displays are used. Purely
analog analyzers typically use long-persistence or variable-persistence displays because the
refresh rate equals the sweep rate.
current probe
A magnetic field sensor that is clamped around power lines to sense conducted emissions.
It is the preferred transducer for most MIL-STD conducted emissions testing. The voltage
at the output of the probe is proportional to the power line current and affected by probe
characteristics. Probe characteristics are provided by the manufacturer in the form of
transfer impedance, Z, which varies as a function of frequency. The equation below
illustrates how probe characteristics may be stated:
default
The preset conditions, options, or parameters of an instrument. The default state may
be changed by choosing key selections or writing programming commands to use other
conditions.
delta marker
An analyzer mode in which a fixed reference marker is established, then a second active
marker becomes available so it can be placed anywhere along the trace. A readout indicates
the relative frequency separation and amplitude difference between the reference and
active markers.
Glossary-3