Vitrek Xitron 6000-2, Руководство пользователя

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44 6000-2 & -3 User Guide, Rev E
Measurement Configuration Menu
The Setup Measurements line of the
SETUP
key menu allows you to fully configure
your instrument’s measuring characteristics according to each particular situation.
The discussions below deal with each menu line in the same order as shown in the
display menu. For this display, scroll using the
ê
key, to access the lower lines.
When the displayed menu matches your requirements, press the
ENTER
key once or
twice, as required, to action any changes made.
Fundamental Frequency
The Fund: menu line allows you to select from three types of fundamental frequency
measurements, which you can use to synchronize your instrument’s amplitude
measurements.
The fundamental frequency types are:
Measured—
The default is
MEASURED
. A selected input measured frequency is indicated for the
instrument’s fundamental
frequency.
Measured (multiplied by a factor)—
The option Meas x .000000 allows you to select an input measured frequency
multiplied by a defined factor, as its fundamental frequency. Enter a value with this
selection. You can also use this menu item to measure sub-harmonic content of a
signal, for example, at 1/2 the fundamental frequency.
Fixed—
The
FIXED
type directly sets the fundamental frequency to be any frequency you
have entered within the range of 0.0005HZ to 100kHZ :
Select the
FIXED
type when:
•
There is no signal present, which has sufficient amplitude at the fundamental
frequency.
•
The fundamental frequency is not stable.
•
The input signal is first applied and the input fundamental frequency is well
known (within a few percent), rather than allowing the instrument time to
establish the fundamental frequency.
•
The fundamental frequency is very low (e.g., 0.0005Hz), forcing the instrument
to wait at least 4 cycles of the input waveform before starting harmonic analysis.