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Section III
Model l l l 80A
Table 3-2. Storage Controls.
ENABLES
Storage Enable - Activates Data Storage; otherwise the 11180A acts
like the Option 004 Isolated BCD
.
Computer Control Enable - Application of "low" state allows Data
Storage to be used with a computer.
Scanner Control Enable - Allows the Scanner to give a Jump
Command.
Storage Limit 10, 20, 30, 40 - Limits the number of stored readings.
All four lines open allows 50 stored readings. All storage
locations up to the Storage Limit must be filled before any
readings are outputted. Scanner Control Enable or Jump Com-
mand may
be
used to cause the unused storage positions to fill
up with the last reading so that a Storage Limit of 10, 20, 30, 40,
or 50 may be reached and the data outputted.
FLAGS
Status Flag
-
Line is "high" while data
is
being entered into
storage,
and "low" while data is being outputted
.
allows one complete input and output storage cycle. It is not to
be used with the 3485A.
Printer Hold
-
The printer disables internal triggering, including that
by the 3485A.
Dump Hold · Inverted Printer Hold.
Input Cycle Hold - The Storage Unit continuously
inputs
data and
doesn't go into the Output
Cycle.
It may be overridden by Pre,
set Trigger.
COMMANDS
Measure· When Computer Control Enable is held low, this line is
used to input and output storage data. When CCE is high, this
line may be used to trigger the 3480.
Storage Flag_ Line goes "high" to acknowledge each Measure Jump · Causes the unused storage positions to fill up with the last
command; goes "low" when the next Measure may be accepted
.
reading so that a Storage Limit of 10, 20, 30, 40, or 50 may be
reached and the data outputed.
HOLDS
Inhibit - Disables the front,panel SAMPLE RATE control of the
3481, 3482, and 3484, and the free running ability of the
3485A.
Ground this line when external triggering is to be used.
Measurement Hold - Prevents both internal and external sampling,
but allows manual sampling
.
When released momentarily, it
3-3. BASIC OPERATION.
3-4.
The
following
rules apply to operation of Data
Storage:
a.
The number of outputs from Data Storage will
always equal the Storage Limit setting (10, 20, 30, 40, or
50).
b. The number of readings stored must always equal the
Storage Limit unless Jump is used to artificially begin an
output cycle.
c. The Storage Limit must equal or exceed the number
of readings to be stored.
d. The maximum input rate (into storage) ..;;; 1000/s.
The maximum output rate..;;; 50,000/s.
3-5. Readings may be gated out of Data Storage by:
a. Printer Hold-Off (for use with printers).
b. Dump Hold (opposite sense as Printer Hold-Off).
3-2
Preset Trigger - Allows a preset number of readings to be stored
prior to and after the trigger.
"O"
line - Stores Zero readings prior to trigger and 50 after.*
"10"
line
-
Stores 10 readings prior to trigger and 40 after.*
"20" line· Stores 20 readings prior to trigger and 30 after.*
*Total number of stored readings depends on the Storage Limit
lines; 50 readings per trigger is illustrated here.
c.
Measure (special
case
with Computer Control Enable
grounded).
3-6
.
Figure 3-2 illustrates the fundamental operation of
Data Storage with
a
printer. Storage Flag falls low to
indicate that the first stored reading is ready to be
recorded. Printer Hold-Off is transmitted back to signal that
the printer (or other device) is taking data. When Printer
Hold-Off drops low, Storage Flag will drop low 16 to 20
µ
s
later to signal that the next reading is ready. Dump Hold
(not shown) is identical to Printer Hold-Off but of the
opposite sense. Status Flag indicates if Data Storage is
storing (high) or outputting (low). The output cycle
continues until the Storage Limit is reached.
3-7. A non-multiple of 10 readings may be stored then
gated out using Jump as shown in Figures 3-3 and 3-4. Once
the desired number of readings have been entered into
storage,
a Jump is issued which begins the output
cycle.
The last reading is repeated to fill the number of outputs to
equal the Storage Limit.
3-8.
If Data Storage is used with a 3485A Scanning Unit
and the number of channels scanned is less than the Storage
Limit, grounding Scanner Control Enable causes an auto-
matic Jump once the
Last Channel is reached. More details
on use with the scanner follows the next section.
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