LeCroy WAVERUNNER 6000 SERIES - Page 39

4.6.3.5.4 1 MΩ /1 Path DC Coupled –
+
-
HFE653
A
B
C
To trigger
20 db
RL4
RL2
RL8
÷10
÷10
AC / DC
Isolation Relay
HF Cal Signal
50
50
50 Ohm Offset
Var Gain
1 MOhm Offset
DAC
Relay
Control
1 MOhm Offset
50 Ohm Offset
Var Gain
6
Channel Input
Serial Bus
To ADC
To ADC
RL6
RL3
3 db
50 Ohm / Hi-Z
Thermal
Link
Thermal
Reference
Overload
- 5V
+ 5V
Hi-Z
buffer
buffer
RL1
÷10
boost
cap
U15
Q11
Q2 &
Q1
Figure 4-14 1MΩ /1 Path DC Coupled Block Diagram
4.6.3.5.5 1 MΩ /10 Path DC Coupled –
+
-
HFE653
A
B
C
To trigger
20 db
RL4
RL2
RL8
÷10
AC / DC
Isolation Relay
HF Cal Signal
50
50
50 Ohm Offset
Var Gain
1 MOhm Offset
DAC
Relay
Control
1 MOhm Offset
50 Ohm Offset
Var Gain
6
Channel Input
Serial Bus
To ADC
To ADC
RL6
RL3
3 db
50 Ohm / Hi-Z
Thermal
Link
Thermal
Reference
Overload
- 5V
+ 5V
Hi-Z
buffer
buffer
RL1
÷10
boost
cap
U15
Q11
Q2 &
Q1
÷10
Figure 4-15 1MΩ /20 Path DC Coupled Block Diagram
Theory of Operation 4-17