HP 8340B Manual 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