HP 8642A Operating Manual page 529

wmmm a n MM wmmmmmmtmm mm mm wm^mmSmm <
NARROW PULSE 125 kHz
D I V I D E - B Y - 1 2 , 5 0 0
OR 2 5 , 0 0 0
COUNTED
SIGNAL
SELECT
COUNT PERIOD
SELECT
COUNT PERIOD 10 Hz OR AUDIO
COUNTED 45 MHz OR AUDIO
SS19
L-GD
L-O
TOfl
NTEQRATOfl
X
TIMEBASE
DIAGNOSTICS
OSCILLATOR DISABLE
LOW-PASS
FILTER
TUNE VOLTAGE
L-GD
o
1
EXT REF SENSE
p / o r "
1
J I
•
EXT REF SENSE
-OBD4
n
UD
POL SENSE
I I TIMEBASE I
| | DIAGNOSTIC BUS
^ 1 2 >
O B D 4 *
SS21 L - — . - J
r-GD
21
DIVIDER DISABLE