HP 54501A Service Manual page 13

Table 1-2. HP 54501A Operating Characteristics (continued)
HP 54501A GENERAL INFORMATION
TRIGGER MODES (continued)
DELAYED TRIGGER :
Event-delayed mode : The trigger may be qualified
by an edge, pattern, time-qualified pattern or state .
The delay may be specified as a number of occur-
rences of a rising or falling edge of the Input
specified as the clock when the pattern is present
or not present . The trigger is an occurrence of a
rising or falling edge of any of the four inputs . The
occurrence values may be set from 1 to
16,000,000 . The maximum edge- counting rate is
100 MHz .
Time-delayed mode : The trigger may be quallfed
by an edge, pattern, time-qualified pattern or state.
The delay is selectable from 30 ns to 160 ms . The
trigger is an occurrence of a rising or falling edge
of any of the four inputs . The number of occur-
rences may be set from 1 to 16,000,000 . The max-
imum edge counting rate is 100 MHz .
TV TRIGGER
60 Hz / 525 lines: Source may be selected to be
any of the four inputs . Trigger level is adjustable
for the selected source . Polarity is selected for
positive or negative synchronizing pulses . A trig-
ger occurs on the selected line and field of a 2/1
Interlaced composite video signal . Line numbering
is 1 to 263 for field 1 and 1 to 262 for field 2 . This
TV trigger mode is compatible with broadcast
standard M .
50 Hz / 625 lines: Same as 60 Hz / 525 lines, ex-
cept numbering is 1 to 313 for field 1 and 314 to
625 for field 2 . This TV trigger mode is compatible
with broadcast standards : B,C,D,G,H,I,K,K1,L and
N .
User-defined mode: Source may be selected to
be any one of the four Inputs . Trigger level is ad-
justable for the selected source . The trigger is
qualified with a high or low pulse that meets a
selectable time range . The trigger is an occur-
rence of a rising or falling edge of the source after
the qualifying pulse . The time settings for the
qualifier are selectable from 20 ns to 160 ms . The
trigger occurrence value is selectable from 1 to
16, 000, 000 .
NOTE : All TV trigger modes require a clamped
video signal for stable triggering . Use the HP
1133A TV/Video Sync Pod to provide clamped
video output that can be used with the HP
54501 A's TV triggering capabilities .
Holdoff : Holdoff is adjustable in 20 ns steps from
40 ns to 320 ms . A separate holdoff setting is
available for each trigger mode except DELAYED
TRIGGER, which is fixed to 40 ns .
Waveform Math
Two independent functions are provided for
waveform math . The operators are +, -, X, VS,
INVERT and ONLY . The vertical channels on any
of the waveform memories may be used as
operands for the waveform math . Sensitivity and
offset for these functions may be adjusted
independently .
Waveform Save
Four non-volatile memories and two volatile pixel
memories are provided . Waveform memories store
single-valued waveforms, such as an averaged
waveform . If an envelope waveform is stored to a
memory waveform, It will automatically be stored
with the upper waveform in one waveform memory
and the lower waveform in another . Pixel
memories store an entire screen of waveform data .
They are very useful for storing multiple, overlap-
ping waveforms and infinite persistence
waveforms .
DISPLAY
Data display resolution : 451 points horizontally by
256 points vertically .
Number of screens: 1,2, or 4 screens can - be selec-
ted . This allows the overlapping of channels or
memories for comparison, or viewing them on up to
4 data display areas .
Display Modes
Minimum persistence : One waveform data value
is displayed in each horizontal position of the dis-
play . The waveform is updated as the new data is
acquired for a particular horizontal position .