8588A/8558A
Operators Manual
46
3) Capture 4096 samples of a 1 Vrms, 4 kHz wave form with a 5 μs acquisition
period and at a rate controlled by an external 10 kHz trigger wave form. See
Table 12.
Table 12. Digitize Example 3
Action Comment
Push .
Aborts the current trigger cycle. Trigger
subsystem placed in INIT:CONT OFF
If not already in voltage mode, push (V or
I) to select Voltage.
Push (Range) and select the 1 V range.
Push (Measure Setup) and set a 5 µs
aperture and a low pass filter if required. When
done, push to return to the main Digitize
menu.
Aperture selection is a compromise between
noise and bandwidth. The input signal is
averaged during the sample time. If the
magnitude of the signal changes during the
aperture a magnitude error will result. While noise
increases as aperture decreases, magnitude error
decreases. The Aperture time should be less than
the sample period to avoid a/d acquisition errors.
Push (Coupling, Zin) and select the
required input coupling and impedance.
For voltage ranges 10 V or less, use DC, Auto.
For the 100 V and 1000 V ranges, use DC, 1M for
best performance.
Connect the signal to be sampled to the active
input terminals.
This provides time for the signal conditioning
circuits to stabilize.
Push .
Push to reset the Trigger subsystem to the
default settings
The default settings pertinent to this example are
ARM2:SOURce IMM
ARM2:COUNT 1
ARM2:ECOUNT 1
ARM1:SOURce IMM
ARM1:COUNT 1
ARM1:ECOUNT 1
Push to set the Trigger Event to External
in the Trigger Setup menu.
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