LeCroy WAVESURFER User Manual

WaveSurfer DSO
WS-OM-E Rev B 99
Fall time Fall time: Duration of falling
edge from 90-10%.
Threshold arguments specify
two vertical values on each edge
used to compute fall time.
Formulas for upper and lower
values:
lower = lower thresh. x amp/100
+ base
upper = upper thresh. x amp/100
+ base
Time at upper threshold
minus
Time at lower threshold
averaged over each
falling edge
On signals not having
two major levels
(triangle or saw-tooth
waves, for example),
top and base can
default to maximum
and minimum, giving,
however, less
predictable results.
Fall 80-20% Fall 80-20%: Duration of pulse
waveform's falling transition from
80% to 20%, averaged for all
falling transitions between the
cursors.
Average duration of
falling
80-20% transition
On signals not having
two major levels
(triangle or saw-tooth
waves, for example),
top and base can
default to maximum
and minimum, giving,
however, less
predictable results.
Frequency Frequency: Period of cyclic
signal measured as time
between every other pair of 50%
crossings. Starting with first
transition after left cursor, the
period is measured for each
transition pair. Values then
averaged and reciprocal used to
give frequency.
1/period

LeCroy WAVESURFER Specifications

General

Input Coupling	AC, DC, GND
Interface	USB, LAN, GPIB (optional)
Channels	4
Display	10.4" LCD
Vertical Resolution	8 bits
Input Impedance	1 MΩ || 50 Ω
Max Input Voltage	400 Vpk (1 MΩ)
Trigger Modes	Edge, Pattern
Bandwidth	200 MHz to 1 GHz