Racal Instruments 9901 Maintenance Manual page 19

FUNCTION
AND
TIMEBASE
LOGIC CODES
FuncHon
Data
A2
Function information
format: 3
lines
coded
as follows.
The
table gives the logic
available
at the
edge
connector.
The
inverse levels are applied
to
the
CDI
Chip
in
the instrument.
TABLE
2
Function Information
Function
Code
a b
c
Frequency
1 1
1
Average
Period 0
1 1
Totalize
A
0
1
0
n
Ratio
A
"T
1 1
0
T.
1.
(single line or
double
not averaged)
line
0
0
1
T.l. (single
line or
double
averaged)
line
1
0
1
Time
Base Selection Data Output
A3 Time
Base information: 3
lines
coded
as follows.
TABLE
3
Time
Base Selection
Code
X
y
z
Frequency
Gate Time
Multiplier
n'
Time
Interval
Clock
1 1
1
0
1
1
1
0
1
0
0
1
1 1
0
0
1
0
1
ms
10 ms
100
ms
1
sec
1
0
sec
1
00
sec
1
^°2
10^
0.1 ps
1
ps
1
0
ps
1
00
ps
1
ms
1
0 ms
9901 Vol.2
Tech
.
Spec
.
(8)