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 samples + 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.
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