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15-2
IM 701210-06E
15.1 DSP Channels (Optional)
Notes Concerning DSP Channels
Notes When Using the DSP Channels as Computation Sources
• The maximum computation rate is 100 kS/s. If this rate is exceeded, the data is
automatically re-sampled at 100 kS/s.
• The computed result is displayed in 16 bits (fixed decimal point). (Computation is
performed using 32-bit floating-point decimal values, but the value is normalized to 16
bits after computation and saved to the acquisition memory.)
• All modules are computation sources.
• Analog channels (CH1 to CH16) are specified as computation sources. The
computed result of a DSP channel can also be specified as a computation source of
another DSP channel. However, only DSP channels with a channel number smaller
than itself can be specified.
Notes Concerning Display
• Value/Div Setting
The unit of the computed result of DSP channels is expressed as “Value/Div,”
because the result may not necessary be a voltage depending on the selected
computing equation.
Value/Div:
123 Value/Div different settings can be specified using the V/DIV knob
(1-2-5 steps).
10.00E–21 [Value/Div] to 500.0E+18 [Value/Div]
• Variable Setting
• When variable is set to OFF (zooming in or out by setting the zoom rate)
Zoom rate:
The following zoom rates are available.
×
0.1,
×
0.111,
×
0.125,
×
0.143,
×
0.167,
×
0.2,
×
0.25,
×
0.33,
×
0.4,
×
0.5,
×
0.556,
×
0.625,
×
0.667,
×
0.714,
×
0.8,
×
0.833,
×
1,
×
1.11,
×
1.25,
×
1.33,
×
1.43,
×
1.67,
×
2,
×
2.22,
×
2.5,
×
3.33,
×
4,
×
5,
×
6.67,
×
8,
×
10,
×
12.5,
×
16.7,
×
20,
×
25,
×
40,
×
50, and
×
100
Zoom position: The waveform is zoomed around the vertical position.
• When variable is set to ON (vertical zoom/expand according to the upper and
lower limits of the display range)
Upper and lower limits:
±
5.0000E+22 [Value/Div]/
±
1.0000E–23 [Value/Div]
Display range:
Up to
±
5.0000E+21.(500.0E+18 [Value/Div]
×
10 [Div])
The display will be clipped at higher values.
• Computation Delay
[4 s the delay of the digital filter
1
]
Varies depending on the computation rate (100 kS/s maximum) of the DSP channel.
If the output result of a DSP channel is specified as a source of another DSP channel,
the computation delay increases.
1. For details on the computation delay of the digital filter, see appendix 6.
Notes on Other Items
• When the DSP channel is ON, the sample rate of the analog channel is limited to 5
MS/s maximum.
• You must set the sample rate to 2 MS/s or lower before turning the DSP channel
display ON or OFF.