HP 3320A Operating And Service Manual page 137

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NOTE 1: Logic signal levels are shown by the letters H or L
preceding the name of the line. The Hand L indicates the true state
(signal present). Voltage levels for the Hand L are:
H ~ +5 V
L ~
a
V
Example:
H Delay Flag - indicates the delay flag line should be + 5 V
when a delay flag signal is present.
L Data Valid - indicates the data valid line should be
a
V when
a data valid signal is present.
NOTE 2: In Remote Mode (A High, B Low) the input on pins 12
and 13 is inverted and applied to pin 8. The input on pin 3 is
inverted and applied to pin 6.
In Local Mode (A Low, B High) the input on pins 9 and 10 is
inverted and applied to pin 8. The input on pin 5 is inverted and
applied to pin 6.
Vee Ie IF 10
O~T';UT
1./10 2A 28 2C 20
POSITIVE LOGIC IY' (IA' IS'le)
+ (
W'IE 'IF)
£'( -
(2A.281
+
(2C.20)
NOTE 3: BCD Low true logic, switch contaet(s) to ground is true
state,
CODE
Digit 1 2 4 S
a a a a a
1 1
a a a
2
a
1
a a
3 1 1
a a
4
a a
1
a
5 1
a
1
a
6
a
1 1
a
7
1 1 1
a
s
a a a
1
9
1
a a
1
NOTE 4: 1C9, la, 11 or 12 operate as a BCD Adder. The two BCD
Inputs
(#I
and
#2)
are summed together and applied to the BCD
Output, The BCD inputs and output lines are high true logic. A true
signal on the A Sign input indicates a negative amplitude number
(I.e., -10.00 dBm). The BCD Input
#2
is a "hard wired" input,
preset
by
means of jumper wires on the pc assembly. See Note 5.
The Complement /0/ input controls the BCD output (01,02,04,
DBl. With the Complement /0/ input high ("" +5 V), the direct BCD
sum of inputs
#I
and
#2
are applied to the BCD Output. With the
Complement /0/ input low ("" -5 V). the 9's complement of the two
inputs is appiied to the BCD Output. The BCD Output lines have
internal pull-up resistors.
Transistor 01 inhibits a Carry-In signal to 1C9 when the Amplitude
Sign is positive. Transistors 02, 03 and associated circuits (IC13, 14
and 15) control the level of the Complement /0/ input.
NOTE 5: Jumpers on the A24B Assembly for IC11 and IC12 are
preset at the factory:
r
FOR IGII FOR IGI2
~ ~
1(+5V)
°
ONE TEN
.:=fr
0
r-'
sljEOel
~ ~ ~O(GNO)
3320A/B B 3558
3320B STANDARD, 50
n
Impedance
(Preset No. 73)
IC12 Jumpered for BCD 7
IC11 Jumpered for BCD 3
3320B OPTION 001,75
n
Impedance
(Preset No. 751
IC12 Jumpered for BCD 7
IC11 Jumpered for BCD 5