Applications
Noise Immunity
Set the
Ll
V cursors
to
the upper and lower threshold limits
of
a digital circuit.
For
example, with TTL:
1.
Superimpose the
Ll
REF cursor on the trace with input coupling at GND.
2. Set the
Ll
cursor
for
a 2.0 V readout.
3. Set the
Ll
REF cursor for 1.2 V readout, the difference between the 0.8 V
lower-threshold limit and the 2.0 V upper-threshold limit.
4.
Set Input Coupling to DC and observe the relationship between the signal
and the cursors. The signal is faulty if it changes direction between cursors
or
if either the high level
or
the low level appears between cursors.
"Quick
and
Dirty"
DC
Voltage Measurement
Sometimes a 5% estimate
of
a
dc
voltage is good enough to verify the
operation
of
a power supply, trace power supply distribution,
or
verify the state
of
a control system.
1.
Display either
CH
1
or
CH
2, and connect it
to
the voltage.
2.
Push AUTO Setup and read the voltage in the trigger level readout. For
voltages in the same range, simply touch the probe
to
the voltage. For best
accuracy, set
VOL TS/DIV so the measured voltage is five
to
fifteen
divisions.
Amplitude Modulation
3-2
1.
Set VOL TS/DIV and VAR for five divisions
of
carrier amplitude. Carrier
amplitude is the difference between positive peaks
of
the modulated signal
and negative peaks
of
the minimum-amplitude part
of
the envelope.
2.
Align the reference
LlV
cursor with the positive peaks
of
the minimum-
amplitude part
of
the envelope and the
Ll
cursor with the positive peaks
of
the signal envelope.
3.
The.
RATIO readout shows the modulation index
in
percent.
2465A/2455A/2445A Operators
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