Table 3. Mnemonics Listing for RF Section

Mnemonic

Active

Description

 

State

 

ADRO-4

 

Address Bits 0 through 4

ATN*

L O W

Attention True

BFC ON

 

Filter Capacitor IN

DAV*

L O W

Data Valid

DIOl-8

L O W

HP-IBData Input/Output Bits

EOI*

L O W

End or Identify

HLE2

HIGH

Phase Lock Loop 2 Lock Enable

HLEY

HIGH

YTO Lock Enable

HOVH

HIGH

Oven Cold

HPON

HIGH

Power ON to IF-Display Section

HPUP

HIGH

Power Up

HSTD

HIGH

10 MHz Standard ON

HSWP

HIGH

Sweeping

HULl

HIGH

Phase Lock Loop 1 or 3 Unlocked

HUL2

HIGH

Phase Lock Loop 2 Unlocked

HULH

HIGH

Heterodyne Oscillator Unlocked

HULM

HIGH

M/N Unlocked

HULR

HIGH

REF Unlocked

HULY

HIGH

YTO Unlocked

HXRF

HIGH

External Reference

HYGH

HIGH

YTO Loop Gain High

IFC*

LOW

Interface Clear

IOBO-15

HIGH

[nstrument Bus Data Bits

KCO-7

 

Key Columns 0 through 7

KRO-11

 

Key Rows 0 through 11

LADR

L O W

-4ddress LED ON

LANR

L O W

Analog Reset

LAOS

L O W

Aux Out Strobe

LB10

L O W

RF Section I/O Strobe

LDAS

L O W

DAC Strobe

LIPS

L O W

Instrument Preset

LLED

L O W

LED Strobe

LMNE

LOW

M/N Output Enable

LRMT

LOW

Remove (High=Local)

LROMl-3

LOW

Enable ROM 3-State Outputs

LRTL

LOW

Local Button Pushed

Overall Troubleshooting 13