HP 8341b - Page 502

Table
E-l.
Motherboard Wiring
List
Mnemonic
HXREF
IFC
L
ADR
HOLD
LALTEN
LALTSEL
LATTN
LBX
LCHNG
LCK1
LCK2
LCK3
LCK4
LDETBW
LHET
LHIBND
LHSOT
LHSOT
RTN
LINE TRIG
LIPS
LKICKYO
LMNE
LMODHLD
LOMD
LOPMOD
DRV
LPROG
Description
EXTERNAL REFERENCE ENABLE
IEEE
488
INTERFACE CLEAR
(IFC)
(USED
FOR
FACTORY PROGRAMMING
ONLY)
ALTERNATE MODE ENABLED
CURRENT INST STATE (FORE/BACK GROUND)
ATTENUATOR
INSTALLED SENSING
BAND CROSS
INSTRUMENT STATE CHANGED
DATA STROBE TO PLL2 COUNTERS
(0,
R2)
DATA STROBE TO PLL2
DIR.
DIVIDER
(0,
RO:)
DATA STROBE
TO
PLL2 PRETUNE DAC
(0,
R1:)
DATA STROBE TO PLL1 VCO GAIN SWITCH
(0,
R3:)
DETECTOR LOW BAND WIDTH CONTROL
HETRODYNE BAND ENABLED
FUNDAMENTAL OR MULTIPLED BAND ENABLED
HEAT SINK OVER TEMPERATURE SENSOR
HEAT SINK
OVER-TEMP
SENSOR BND RETURN
LINE TRIGGER SENSING 5V SECONDARY
INSTRUMENT
-
PRESET
LOW KICK PULSE
M/N
OSCILLATOR LOCK ENABLED
LINEAR MODULATOR SAMPLE/HOLD
OVER-MODULATION
DETECTED
LOW
BAND PULSE MODULATOR DRIVE
(USED
FOR
FACTORY
PROGRAMMING
ONLY)
Type
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIG.
OPEN COLL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
GROUND
RECTIFIED
AC
DIG OPEN
COLL
ANALOG
DIGITAL
DIGITAL
DIG.
OPEN
COLL.
ANALOG
DIGITAL
Levels
TTL
(HIGH
TRUE)
TTL (LOW TRUE)
TTL
(LOW TRUE)
TTL
(LOW TRUE)
TTL (LOW TRUE)
TTL
(LOW TRUE)
TTL (LOW TRUE)
TTL (LOW TRUE)
TTL
(LOW
TRUE)
TTL (LOW TRUE)
TTL (LOW TRUE)
TTL
(LOW TRUE)
TTL
(LOW
TRUE)
TTL (LOW TRUE)
TTL (LOW TRUE)
TTL (LOW TRUE)
0V
LINEFREQ7VTO-10V
TTL (LOW
TRUE)
0 TO
+5V
TTL (LOW TRUE)
TTL
TTL (LOW TRUE)
CURRENT SOURCE
TTL (LOW TRUE)
E.12 Motherboard Wiring
List
HP
8340B/41B