HP 3320A Operating And Service Manual page 140

Logic level low (false) Base
~
-1.19 Vdc
Collector
~
-5.93 Vdc
0.64 Vdc
2.64 Vdc
" 5
I COMPONENT
A CIRCUIT
TO XA3
A3
hp
Par! No. 03320-66503
Rev C
CCCC~OOOCDODDOD
Logic level high (true) Base
Collector
NOTE 3: DC voltage levels on the base and collector of transistors
Q1 thru 08 depend on logic level of base signal. Voltage levels
versus logic levels are as follows:
NOTE 2: Logic levels are high true
(+
5 V)
(9's complement of front panel settings)
SCHEMATIC
CONNECTOR
INSTRUMENT TYPE
NUMBER
NUMBER
1
XA20A
"A" Model - Standard,
Options 001 ,002,006
2
XA21A
"B" Model - Standard,
Options 001,002,006
3
XA22A
"A" Model - Option 003
"B" Model - Option 004
8
XA22A
"B" Model - Option 007
NOTE 1: The following table lists the schematic number and
connector "'Imber versus instrument type for controller board
interfacing:
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I