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Section I
Model l l l
80A
Table 1-1. Specifications.
CHARACTERISTICS
Capacity: 10, 20, 30, 40, or 50 complete 3480A/B readings
selectable
using Storage
Limit.
Information stored
With 3481 A, 3482A
,
or 3484A
:
4-digit
reading plus a 5th
overrange digit, 2-digit
storage
reading number, polarity,
overload,
function,
and
range.
With 3485A
:
4-digit reading plus a 5th overrange digit, 2-digit
storage
reading number, tens
channel
l.D., polarity, overload,
and
range
.
Speed
Input rate
:
up to 1000 readings per
s
may be
stored.
Output rate
:
up
to
50,000 readings per s.
REMOTE CONTROL LINES
When Used With A Digital Recorder . . .
Storage Enable: application of "Low"
state
enables Data Storage,
otherwise the output
is identical
to Isolated BCD.
Scanner Control Enable: application of "Low"
state
allows 3485A
Scanning Unit to be used with Data Storage
.
Storage Limit (4 lines): limits number of stored readings to
10,
20,
30, 40, or 50. If all lines are open, 50 readings are stored
.
Storage Flag: used to trigger digital recorder
.
Remains "High"
during
storage
cycle then drops
"Low"
to indicate data is ready
to be printed. Goes "High" during
printing
cycle then drops
"Low"
to indicate
next
reading is ready.
Printer Hold-off: application of
"High" state
(by digital recorder)
disables
internal sampling
and gates a reading out of
storage.
When Used With A Computer ...
Storage Enable:
application
of
"Low" state enables
Data Storage,
otherwise the output is identical to Isolated BCD.
Computer Control Enable: application
of "Low" state allows
Data
Storage to be used with a computer.
Measure (Encode): application of
"Low" state
initiates a reading
which
is in
turn, entered into storage. During
an
output cycle,
Measure gates individual readings out of
storage
.
Storage Flag: line goes "High" to acknowledge each Measure. Line
drops "Low" when Data Storage is ready to accept the next
Measure.
Status Flag: line indicates if Data Storage is storing data by
remaining "High" or outputting data by remaining "Low"
.
Internal Measure Inhibit (Interface Hold): application of
"Low"
state disables
internal
sampling but allows DVM to be externally
triggered by Measure.
Jump: overrides the normal
requirement
of filling all storage
locations selected by Storage Limit before outputting data.
Allows a non-multiple of 10 readings to be stored then
outputted
.
1-2
Lines Available For Special Applications ...
Input Cycle Hold
Causes continuous input of data into storage with no output.
When used with Preset Trigger, output of stored data begins
after selected number of readings are stored
.
Dump Hold: opposite sense as Printer Hold-off. Allows readings
which have been stored to be gated out
.
Measurement Hold: prohibits all internal and external sampling but
allows the completion of one complete storage and output cycle.
Preset Trigger
Allows preset number of previous and next readings to be stored,
then outputted. This line is normally used with
Input
Cycle
Hold grounded.
"O"
line
:
stores previous 0 readings and the next 50 read-
ings .* "1 O" line: stores previous 10 readings and the next
40
readings .* "20"
line: stores previous 20 readings and
the next 30 readings.*
*Total
number of stored readings depends on selection of
Storage Limit. Conditions shown above are for 50 stored
readings.
LOGIC LEVELS
For all input lines except Printer Hold-off:
State
Requirements
"High" (logical "1 ")
+
2.4 V to+ 5.5 V or open
"Low"
(logical
"O")
0 V
to+
0 .7
V,
2 mA sink current
or contact closure to ground
through
.:;;;
250
n.
Printer Hold-off:
State
Requirements
"High"
(logical "1
")
+ 3 V to+ 16 V
10 mA max
source
current at
+
16
v
400 µA max source current at
+5V
"Low"
(logical
"0")
0 to+ 0.5 V, 10 µA max
sink
current
Storage Flag:
State
Output Characteristics
"High"
(logical "1
")
;;;,,
+ 5 V, 2 mA max source current
;;;,, + 3 V, 10 mA max source current
"Low"
(logical
"0")
<+ 0.5 V, 12 mA max sink current
BCD Output and Status Flag:
State
Output Characteristics
"High" (logical
"1")
;;;;.+
5 V, 1 mA max source current
;;;,,
+
3 V, 10 mA max source current
"Low" (logical
"0")
<+ 0.5 V, 12 mA max sink current
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