23
Subject to change without notice
H o r i z o n t a l S y s t e m
will display on the screen. With peak detection activated when
reading out, skipped data will be used to create a minimum and
maximum value. The smallest detectable pulse is the period of
the sampling rate used to write to the acquisition memory. This
describes the so-called memory peak detection.
If one of the peak detection modes or a combination of the two
are used, the corresponding detection mode is marked with
„PD“ in the upper right of the display.
5.3.7 High Resolution
This mode uses Boxcar Averaging via adjacent detection points
(i.e. the converter runs at the maximum sampling rate) to in
-
crease the vertical resolution to up to 10 bit. You can deactivate
this function within the menu or you can select the automatic
switching mode.
Averaging several adjacent sampling rates creates a value with a
higher degree of accuracy than the input data. The resulting data
is called high resolution data. The process of merging multiple
sampling rates to one new value only allows a sampling rate that
is smaller than the maximum value. If the HIGH RESOLUTION
mode is activated and the current instrument setting allows
the use of the HIGH RESOLUTION mode, the detection mode is
marked with „HR“ in the upper right of the display.
The following requirements must be met to activate the
HIGH
RESOLUTION
mode:
– Sampling rate is smaller than the maximum sampling rate
(no Interlace mode)
– Peak detection is deactivated
– No active logic pod (POD)
– None of the serial or parallel buses are active
By default, all functions listed above are deactivated.
5.3.8 Waveform Rate
This soft menu item provides the following functions:
– MAX. WFM RATE:
This mode allows you to select the memory depth and
sampling rate to obtain the maximum trigger repeat
rate. When using the
MAX. WAVEFORM RATE
mode, the
oscilloscope is set to display the maximum amount of
captures per second in the signal window. Each column
in the signal window displays a captured date. When peak
detection is activated, each column displays a pair of min/
max values.
The HMO oscilloscope displays a signal window of 600x400
pixels (Yt without zoom). This translates into 600 data points
per detection. When peak detection is activated, 600 pairs
of min/max values or 1,200 data values are displayed. The
memory depth corresponds to at least the displayed time
window (time base x signal window grid section in horizon
-
tal direction) multiplied by the current sampling rate. The
minimum value is determined by the maximum sampling
rate and the maximum signal repeat rate of the oscilloscope.
The displayed sampling rate corresponds to the current
sampling rate divided by the amount of data skipped while
reading out from the acquisition memory. If peak detection
is activated, the displayed
sampling rate corresponds to the
current sampling rate.
– MAX. SAMPL. RATE:
If this function is activated, the instrument always sets the
maximum sampling rate while using the maximum memory
available. The
MAX. SAMPL. RATE
function always uses the
maximum sampling rate and displays the maximum amount
of data. Each column in the signal window displays up to 40
detected data values (limited by processor performance).
How much data is currently displayed depends on the dis
-
played time window and the current sampling rate. If peak
detection is activated, each column displays up to 20 pairs
of min/max values.
The memory depth always corresponds to the maximum
acquisition memory. The displayed sampling rate is identi
-
cal with the current sampling rate. Peak detection is used
if the displayed time window contains more data than 40 *
signal window columns in the acquisition memory or min/
max data in the acquisition memory.
The entire oscilloscope memory can only be read
out by interface if the maximum sampling rate has
been activated (refer also to the HMO SCPI Manual).
Fig.5.3: AM modulated signal with maximum sampling rate
– AUTOMATIC:
This mode is the standard mode: the instrument always
selects the optimum combination of capturing and sampling
rates (memory length used).
Each column in the signal window displays up to 10 captured
data values. How much data is currently displayed depends
on the displayed time window and the current sampling rate.
When peak detection is activated, each column displays up
to 5 pairs of min/max values.
Fig. 5.2: AM modulated signal with maximum repeat rate
