Tektronix 222 Operator's Manual page 101

More On How It Works-222 DSO O~erators
RECORD Mode: For SECIDIV settings from 5 ps per division to
50 ms per division, the default acquisition mode is continuous
RECORD. When a trigger occurs, a full record of waveform data is
acquired and displayed; the Trigger MODE selected does not matter.
How the waveform display acts does depend on the Trigger MODE
and whether STORE or NONSTORE display mode is selected. The
trace is held displayed between triggers for STORE Mode and in
SSEQ Trigger Mode. In NONSTORE display mode, the trace is
blanked after the display is updated until another trigger occurs
(except in SSEQ Trigger MODE where the display is held until the
button is pressed to start another sequence).
When the display memory is filled, the Trigger MODE selection and
the setting of the STOREINONSTORE function determines how the
acquisition and display continues.
If STORE is active, and the Trigger MODE is not SSEQ, the display is
held from trigger to trigger and new data points obtained simply over-
write the previous data points. Placement of the new data points in
the display will follow any ac or dc movement of the waveform, but the
old data points are not changed until they are overwritten.
If NONSTORE display mode is selected, the waveform is cleared as
soon as the display memory is full, and the trace is blanked until a
trigger occurs to acquire new data points. If the Trigger MODE is
SSEQ, the waveform display is maintained until the button is
pressed to restart the single-sequence acquisition or another Trigger
MODE is selected. In AUTO BL Trigger mode, a trigger is forced if
one does not occur, the data captured is displayed.
REPETITIVE STORE (Equivalent-Time Storage): For SECIDIV set-
tings of 50 ns per division to 2 ps per division, the default acquisition
mode is REPETITIVE for NORM and AVG acquisition modes only. At
the start of an acquisition, the display memory is cleared. Then, with
continued triggering on a repetitive waveform, the display memory is
filled with data points. The waveform display is maintained as the
data points are obtained so that the fill rate can be observed. Each
data point obtained is seen as a dot in the display until the 51 2 point
REV JUN 1989 6-9