5790B
Operators Manual
4-14
Measurements should not be considered valid while there are dashes (--) in the
measurement value, as shown below. These dashes indicate that the
measurement is unsettled.
+/- 3% (1 year) 83 days since calibration
2/06/15 10:52am
V
1.0000
2.0093--
kHz
Input 2
Set
Reference
Setup
Menu
Statistics
Select
Current
Shunt
Auto Range 2.2 V
Peak-to-Peak
hvi001.eps
Digital Filter Mode
Located in the Setup Menu>Instrument Setup, the digital filter is used to obtain
optimum results in measurement environments with various levels of noise.
When enabled, a software digital filter makes the measurement shown become
an average of the 4, 16, or 32 most recent measurements. These numbers
correspond to the FAST, MEDIUM, and SLOW rates that you select with the
Digital Filter Setup Mode function. The Filter Fill Count indicator at the top of
the display increments until the window is full, although full resolution is shown
with the first settled reading.
The digital filter affects the value shown on the display as well as the value used
for references and delta computations when the Product is in transfer mode.
Note
When you select a Digital Filter Mode of SLOW or MEDIUM, the
display shows an extra digit of resolution in some main input and
WIDEBAND input ranges. See Table 4-5 for details.
The digital filter restart floor is user-configurable and is found in the Setup
Menu>Instrument Setup. Use the restart floor to set the threshold for restarting
the filter (as a way of rejecting inconsistent readings). Readings over the
threshold flush the filter and start a new running average. Until the filter
completely fills without being restarted, the Filter Fill Count indicator at the top
of the display increments until the window is full. The restart settings are
COARSE, MEDIUM, and FINE, corresponding to 1000, 100, and 10 counts,
respectively. For sources that are unstable or noisy, you may have to use the
COARSE restart threshold in order to get settled readings.
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