LeCroy WaveSurfer 400 Series User Manual

4-8 Theory of Operation
Trigger level control
TRC
TRIG LVL2
TRIG LVL1
LINOUT
Comparator
External Clock signal
R88
EXT HYST
TRIG LVL2
MST REF3
RL3
800k ohms
Bandwidth
Limiter
RL2
TRB
LINOUT
EXT CLK
MST429A
Thermistor
Offset control for
ECL/0V/TTL level
OUT2
AC Line signal for Line Trigger
CH4 HYST
HTR420
ECL LVL
PLD
OUT2
1 / 10
Differencial amplifier
DC signal for DC calibration
RL3
LINE SIG
TRIG LVL1
AGC
amplifier
OUT1
OUT1
Trigger level control
EXT Input
Trigger level control
CH2 HYST
LM1881
high impedance buffer
RL1
ECL Logic level
LINOUT
HTR420
HTR420
TRA
TRIG LVL1
MST REF2
OUT2
Trigger hysteresis control
VALE
CH3 TRIG SIG
HTR420
OUT1
Differencial
to Time Base
CH4 TRIG SIG
200k ohms
*CH1 TRIG SIG
VALD
TRIG LVL1
Trigger level control
LINOUT
Trigger hysteresis control
TRIG LVL2
VALC
OUT2
EXT TRIG
EXT OVLD
MST REF4
*CH2 TRIG SIG
Differencial amplifier
MST REF1
ECLinPS Lite
VALB
2200pF
EXT
OFFSET
OUT1
INT CAL
Trigger hysteresis control
TRIG LVL2
VALA
LINOUT
DC signal for
Over Load
HTR420
Comparator
+12V
*CH4 TRIG SIG
TRE
TRIG LVL2
TRIG LVL1
OUT2
CH1 TRIG SIG
ECLB
*CH3 TRIG SIG
Buffer
CH1 HYST
CH3 HYST
50 ohms
Differencial amplifier
TRD
TV Trigger
Differencial
500mVpp full scale
Differencial amplifier
OUT1
CH2 TRIG SIG
ECLA
Trigger hysteresis control
Figure 4-7 Trigger Block Diagram

LeCroy WaveSurfer 400 Series Specifications

General

Brand	LeCroy
Model	WaveSurfer 400 Series
Category	Test Equipment
Language	English