Reference
3-40
370B User Manual
The average method for subjected data in a displayed curve is expressed by an
equation that provides a pseudo moving-average calculation.
D
na
= (D
n–1
x (N – 1) + D
n
) / N, where:
D
na
= averaged one data in curve,
D
n–1
= previous data,
D
n
= currently acquired data,
N = average number
Averaging is useful for reducing uncorrelated noise in signals and improves its
signal-to-noise ratio.
In ENVELOPE mode, either HORIZONTAL ENVELOPE or VERTICAL
ENVELOPE is selected by the ACQ MODE switches. The 370B repetitively
acquires the curves and displays the resultant waveform envelope. The waveform
is compared to the maximum and minimum values of the same data point from
previous sweeps. If the data point is either greater than the previous maximum
value or less than the previous minimum value, the previous data point value is
replaced by the new value. If the data point falls between the currently held
maximum or minimum value for that point, it is discarded.
Enveloping is useful for revealing subtle variations in signals and allows the
370B to be left unattended for a long period of time while monitoring signals for
time and amplitude variations such as thermal drift.
The 370B has a mass storage system consists of non-volatile IC memory and
3.5-inch floppy disk drive. This system can store characteristic curve data, text,
front panel settings, and other information in mass storage. Up to 64 characteris-
tic curves and 64 sets of front panel settings can be stored in a floppy disk, and
16 curves and 16 sets of settings in non-volatile IC memory. Data stored in mass
storage can be transferred to external devices via the GPIB interface. See Section
4 for more information about GPIB functions.
In the Store or View mode, pressing the ENTER button stores the characteristic
curve, the displayed setting and readout values, and any displayed text in mass
storage. Information stored in mass storage can be displayed by pressing the
VIEW button. The intensity of a characteristic curve displayed from mass
storage is controlled with the NON STORE/STORE/VIEW INTENSITY knob.
While in Sweep mode, pressing the ENTER button stores all captured data in
mass storage. The stored data can be displayed by pressing the VIEW button.
Mass Storage
Saving in Store and
View Mode
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General