HP 8340b - Page 223

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
DRY
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
Change
5
HP
8340B/41B