NTi Audio Digilyzer DL1 - Manual (Page 45)

45
Level Sweep
The Digilyzer supports a RMS based frequency sweep. This function
can be applied to measure the frequency response of devices.
During a frequency sweep, the Digilyzer records the Level RMS of
every input signal, that has a stable frequency and level, provided that
the frequency is higher than the one of the previous sample (otherwise
the sample will be neglected).
Within a graph every recorded sample is connected by a straight
line approximately to the previous / next sample, thus building the
displayed curve.
In practice the following steps are required / available for the execution
of a frequency sweep.
• Arm the sweep recording process by moving the cursor to the
REC field and pressing the enter key.
• The DL1 detects the start tone (315 Hz or 1 kHz) of an external
sweep and the recording is automatically started. This status
is indicated by the flashing REC field.
Alternatively, the sweep recording may be started manually
by pressing the enter key with the cursor on the ARM field.
Consequently, the DL1 records every incoming signal with a
higher frequency than the previous sample.
Fig 5-43, Frequency sweep graph
Arrow readout
Arrow mode
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Y-Scale
Measurement Functions