Waveform Mode
VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual
3- 7
Sound in Sync
(PAL only, not shown in Figure 3--2): enables the measurement
set to lock or sync to signals that contain digitally-encoded sound information in
the sync pulse. When sound information is contained in the sync pulse, Sound In
Sync must be selected or else the measurement set will display the message
“Loss of sync.” When Sound In Sync is selected, less of the sync pulse is
available for synchronization, which makes the signal timing more susceptible to
noise and jitter.
The Sound In Sync soft key only affects Waveform mode. For all other manual
modes, Sound In Sync is enabled with the SIS Present “yes” parameter in the
active Measurement Locations file.
Change Sampling
: toggles between synchronous, asynchronous, and free-run
sampling. For a stable source, use synchronous mode; for an unstable source (a
VCR for example), first use asynchronous mode. If this does not work, use
free-run mode. In free-run mode, line or field syncs are not used, and you lose
TV timing references.
The Noise choice sets the decibel value for noise reduction. Highlight the soft
key and rotate the knob to change the decibel value. Noise reduction is enabled
with the Average button. Noise reduction up to 30.1 dB in 3.01-dB steps is
available. Larger noise reduction settings require a longer settling period.
Pressing the Extra Functions soft key brings up the following submenu:
Gain
: allows direct control of the hardware used in acquisition. Gains of 0.25 to
7.75 in steps of 0.25 are available. A larger gain gives a smaller input range, but
more resolution. The input range is indicated by two horizontal cursors. Signals
beyond these cursor levels are clipped.
Offset
: used to bring the signal inside the cursors that appear when the Manual
Gain mode is on. Otherwise, hard clipping may occur.
Manual Gain
: selects control of the input gain and offset used from the other
soft keys in this submenu. When deselected, normal automatic gain control is in
effect. When highlighted, two horizontal cursors appear in the waveform area,
showing the limits of the input range before hard clipping occurs.
Screen Memory
: when highlighted, causes screen erasures to cease, allowing a
“build-up” of displayed waveforms. This is useful for looking at eye-heights,
jitter, or abnormal excursions of the signal over a period of time. The screen is
cleared if the waveform is moved by the knob.
NOTE
. Calibration is suppressed in Screen Memory mode.
Noise [0 dB - 30.10 dB]
Extra Functions
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Summary of Contents for VM700T
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