Manual

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Time SweepTime Sweep
Time SweepTime Sweep
Time Sweep
In the TIME SWEEP mode, ML1 records a user-defined number of
measurements in selectable time intervals.
Thereby, the unit simultaneously records the mean and the min-max values
of:
• LEVEL RMS and
• THD+N and
• Frequency
The curves of these measurement functions are stored in individual graphs.
Within a graph, every sample is represented by a single dot only, thus
building the displayed curve (Fig 21).
In practice, the following steps are required / available for the execution
of a time sweep:
• To enter the time sweep mode, select the entry SWEEP → TIME in
the measurement function submenu.
• If required, activate a filter through the corresponding menu.
• To select the curve to be displayed (LEVEL RMS, THD+N or
Frequency) move the cursor to the curve entry, press enter key,
use the arrow keys and confirm with the enter key.
• To select the mean / min-max mode, move the cursor to the
corresponding field, press enter and the arrow keys.
The curve and the mean/min-max mode can also be
selected after the sweep recording is completed.
• Move the cursor to the REC field and press enter.
Measurement Functions
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Fig 21 Time Sweep Graph
• Arm the sweep recording process by moving the cursor to the
REC field and press the enter key. Make sure that the signal
generator is at its lowest sweep frequency when the recording
process is starting.
• The unit detects the start tone (315 Hz or 1 kHz) of an external
sweep and as soon the frequency changes 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, ML1 records every incoming signal with a higher
frequency than the previous sample.
• The sweep recording will be stopped as soon as an input signal
with a lower frequency occurs, or as soon as the enter key is
pressed with the cursor on the flashing REC field.
• In order to analyze the sampled curve more detailed, activate the
arrow mode by placing the cursor to the corresponding symbol,
press the enter key, and move the arrow to the sample(s) of interest
by using the left / right keys.
• To zoom in/out the Y-axis, move the cursor to the zoom mode
field, press enter and use the left / right keys.
• To scroll through the Y-axis, move the cursor to the zoom mode
field, press enter and use the up / down keys.
The last recorded sweep curve will be stored internally, even after leaving
the sweep mode or switching off the Minilyzer. As soon as the frequency
sweep mode is re-entered, the curve will re-appear on the graph, until a
new frequency sweep is started.
NOTES • As soon as the sweep mode is entered, the filter that
has been active during the recording of the last curve
will be re-activated.
• The auto power off is disabled during a frequency
sweep recording.
Measurement Functions
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