User manual

Operating Basics
2-10
AM700 Audio Measurement Set User Manual
Pressing the Freeze button (a toggle) halts display updates. Some frozen displays
cam be expanded horizontally and vertically. When expanding a frozen display, the
AM700 interpolates acquired data to provide display points for the expanded
displays. Also, cursors can be used on the frozen display to make measurements.
Display updates are resumed when Freeze is pressed a second time.
A selection of input filters is available in AM700 firmware for use with the Audio
Analyzer. Other types of filter are available from within applications that require
specific filtering to obtain the measurement. Refer to Input Filtering on page 4-75
for information on filter types and operation.
When the Audio Analyzer application is running, pressing the Filter button (a
toggle) applies the selected filter to the measurement data. You can select from a
menu of available filters by pressing and holding the Filter button to display the
choices available for Channel 1 and Channel 2. To access the choices, the Filter
front-panel button must be lighted (Filter on).
Pressing the Cursors front-panel button places two cursors on the display and lets
you position them to mark display features. The numerical display shows frequency
and level at each cursor location and the timing difference between the two cursors.
Cursors can be used to select measurement points in a waveform. Cursor position is
adjusted using the Control Knob with cursor positioning active. The cursors can be
used to provide a continuous readout of the amplitude and frequency at the cursor
position. The active cursor position is also the expansion point when horizontal
expand (Zoom) is enabled.
The difference readouts (both amplitude and time or frequency) shown in the view
window above the graticule are based on the position of cursor 1 (the solid cursor)
minus the position of cursor 2 (the dashed cursor).
NOTE. When cursors are visible in the display window, cursor position is shown
above each cursor. When cursors are positioned beyond the display window, cursor
position is shown in either upper corner of the display with an arrow pointing
toward the cursor.
Freeze
Filter
Cursors