HP 54501A - Page 12

HP
54501A
GENERAL INFORIVIATION
VERTICAL
Deflection factors : Channels 1 and 4 : With
single
screen selected, attenuation
factors are adjustable
from 5
mV/div
to
5 V/div in a 1-2-5 sequence with
the knob .
Finer adjustments may be made using
direct keypad entry or the knob with the
FINE key
selected .
Channels 2 and
3 : With single-screen mode selec-
ted, attenuation
factors are adjustable from 100
mV/div to 500
mV/div in a 1-2-5 sequence with the
knob . Finer
adjustments may be made using direct
keypad
entry or the knob with the FINE key
selected .
Probe
attenuation factors : Values from 0 .9 to 1K
may be
entered to scale the oscilloscope for exter-
nal
probes or attenuators attached to the channel
inputs
. When probe tip calibration is performed,
this
value is calculated automatically .
Bandwidth
limit (HF Reject) : May be selected for
each
individual input to provide a low-pass
filter
with
a
-3
dB point at approximately 20 MHz
for
both
triggering and signal display .
ECL/TTL Presets : vertical deflection
factor, offset,
and trigger level may be
preset independently on
each channel for ECL
and TTL levels .
HORIZONTAL
Dual time base
windowing : Allows user to zoom
in on
user-defined portion of the waveform using
cursors that are displayed on the top halt of the
screen . Anexpanded time
base is displayed on
the lower half of
the screen . The window time
base may be
set to provide as much as a 20 :1 ex-
pansion ratio
.
Waveform
measurements are performed on the
dual time base window
information when window-
ing is turned on .
Delay between channels :
difference in delay be-
tween channels may be
nulled out to compensate
for differences In input
cables or probe length .
Use the time null cal
found in the Utility menu .
Table 1-2,
HP
54501A
Operating Characteristics
Reference
location : The reference point may be
located at the left edge, center, or right edge of the
display . For zero delay, the reference point is the
trigger point . For non-zero delay, the reference
point is equal to
the trigger point plus
the
delay
time .
TRIGGER MODES
Edge trigger
: Positive or negative edge may
be
selected
for trigger on any of the four
channel
inputs .
Pattern trigger : A pattern may be specified using
all four of the inputs . Each of the inputs may be
specified as
a high, low, or don't care with respect
to
the level setting in the edge trigger menu .
Trigger may be selected to occur on the last edge
to enter the specified pattern or the first edge to
exit the specified pattern .
Time-qualified pattern
trigger : A trigger will occur
on
the first edge to exit a pattern, only If It meets
the specified time criteria . The available time-
qualified modes are :
pattern present less than [time] pattern present
greater than [time] range-pattern present
greater than [timel] and less than [time2]
The time [time] settings are adjustable from 20 ns
to 160 ms (t/-3% ±2 ns) . The time filter recovery
time is less than or equal to 12 ns
.
In the
PATTERNPRESENT
LESS THAN [TIME] mode,
the pattern must be present
greater than 7 ns for
the trigger to respond
.
Glitch trigger : Use PATTERNPRESENT LESS
THAN [TIME] with [time] selected such that
is just
under the pulse
width of the signal you are analyz-
ing . The
minimum capturable glitch width is 7 ns .
State trigger : A
pattern is specified on any three of
the four inputs
with the fourth input used as a
clock .

A trigger
will occur on the rising or falling
edge of the input specified as
the
clock . A
trigger
will occur on the rising or falling edge of the input
specified as the clock when the pattern is present
or not present . Setup time for the pattern
with
respect to the clock Is less than or equal
to 10 ns ;
hold time is zero .