HP 11180A Service manual

MODEL 11180A
DATA STORAGE

"J
OPERATING AND SERVICE MANUAL
-hp- Part No. 11180-90000
MODEL 11180A
DATA STORAGE
Copyright Hewlett-Packard Company 1971
P.O. Box 301, Loveland, Colorado, 80537 U.S.A.
Printed: SEPTEMBER 1971

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---------HEWLETT.PACKARD---------
~
CE RTI Fl CATI 0 N
The Hewlett-Packard Company certifies that this instrument was
thoroughly tested and inspected and found to meet its published
specifications when it was shipped from the factory. The Hewlett-
Packard Company further certifies that its calibration measure-
ments are traceable to the U.S. National Bureau of Standards to
the extent allowed by the Bureau's calibration fatility.
WARRANTY AND ASSISTANCE
All Hewlett-Packard products are warranted against defects in
materials and workmanship. This warranty applies for one year
from the date of delivery, or,
in the case of certain major compo-
nents listed in the operating manual, for the specified period. We
will repair or replace products which prove to be defective during
the warranty period provided they are returned to Hewlett-
Packard.
No other warranty is expressed or implied. We are not
liable for consequential damages.
Service contracts or customer assistance agreements are available
for Hewlett-Packard products that require maintenance and re-
pair on-site.
For any assistance, contact your nearest Hewlett-Packard Sales and
Service Office. Addresses are provided at the back of this manual.
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Model 1l 180A Table
of Contents
TABLE OF CONTENTS
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Section IV (Cont'd) Page
I. GENERAL INFORMATION . ........ . .. ... . 1-1 4-22. Turn-On
.. . .. .. . ... .. .... .. ..... ... 4-1
1-1 . Introduction ...... .. .. . . . . .. . . . . .... 1-1
4-24. Printer and Dump Hold Cycling . . .... .. . 4-2
1- 7. Accessories Furnished
4- 26. Panel Transfer . . . . . . . . . . . . . . . . . . . . . . . 4-2
(with Data Storage Only) . .
.. .. .. . ... 1-1
4-30. Basic Counter .. .. .... . . . .. .. ... . . ... 4-2
1-8. Accessories Available
(with Data Storage Only) . . .. . ... . . .. 1-1
4-3 7. Preset Triggers .... . . . ........ . ... . . . . 4- 2
4-39. Jump . . .... . .... .. .... . . ... . .... .. . 4-3
~fun &~
II. INSTALLATION ... . . .. .. . .. . ... ..... .... 2-1
441. Limits .. .... ... .. . ... .... ..... .... .4-3
443. Measurement Hold .. . ... ... .. . .. . .. . . 4-3
2-1. Introduction .. . ...... .. . .. . . ... . .... 2-1
446. Scanner Control ... .. . .. . . .. .... .. ... 4-3
2-3 . Initial Inspection .. . . . ... . ..... ... .. .. 2-1 4-51. Computer Control . .. ... .... ... .. . .. . . 44
2-5. Installation of 1l180A into 3480A/B . . . . . 2-1
2- 7. Storage Connector . . . .. .. . .. . . . .. . ... 2-1
~fun &~
2-9 . Repackaging for Shipment . . .. . ...... . . 2-1 V. MAINTENANCE . . . . . .. ....... . . .. ....... 5-1
5-1 . Introduction .. . .. . . ... . . . .. .... . .... 5-1
~fun ~
5-3. Equipment Required . ... . . . .. . . .... .. . 5-1
III. OPERATING INSTRUCTIONS .. ... .. . ... . .. 3-1 5-5. Performance Checks ..... .... . . ... .... 5-1
3-1 . Introduction . . ... .. . .. . . . . .. ..... ... 3-1 5-7. IBCD Check .. .. .. . .. . ... ... .. .. ... 5-1
3-3. Basic Operation . . . ... ... ... .. .. . ..... 3-2 5-8. Storage Check . . .. .. .... . . . . . .. . .. . . 5-1
3-13. Operation with Single Channel Plug-Ins . .. 3-5 5-14. Troubleshooting ........ .. . .. . .. .. .. . 5-1
3-18. Operation with Scanning Unit . ... .. . ... .3-6
3-25. Sample-and-Hold Improves Digitizing . ... . 3-8
~fun &~
3-29. Data Storage Used in the 2070A ... ..... . 3-9
VI. REPLACEABLE PARTS ... ... . . ... .. .. .. .. 6-1
3-32. How to Clear Data Storage . .. . .. ...... 3-10
6-1 . Introduction .. .. .. ... . ..... . ... ... . . 6-1
3-36. Applications . .. .. ... .... . .. . . . . .. .. 3-10 64 . Ordering Information . .. . . .. .. . .... . . . 6-1
6-6. Non-Listed Parts . ... . ..... .. .. . ... . .. 6-1
Section Page
IV. THEORY OF OPERATION . . .... .. . ...... . . 4-1
Section Page
4-1. Data Output
....... .. . .. .. .. . .. . .... 4-1
VII. CIRCUIT DIAGRAMS . .... .. . . ..... .. . . .. . 7-l
4-2. Present Mode (Isolated BCD) . ... . .. .. . 4-1
7-1. Introduction . ..... . ...... . . .. . ...... 7-1
44. Storage Mode (Memory) . . ... . . . .... .. 4-1 7-3 . Notes .. .... . .. ........ . . .. . . . . . . .. 7-1
4-6. Panel Transfer ........ ... .. . . .. ..... 4-1
4-8.
IBCD ... . ... ... .... . ... .. . ...... . .. 4-1
4-13. Inhibit and Printer Hold .. .. . .. . .. . ... . 4-1
Appendix
4-15. Encode (External Trigger)
.. . .. . ... . ... . 4- l
A. CODE LIST OF MANUFACTURERS
4-1 7. Basic Storage .. ... . . .... . ..... . . . . . . . 4-1
B. SALES AND SERVICE OFFICES
LIST OF TABLES
~~m &~
l-1. Specifications .. . . .. .. . . .. . . .. .. . . . .. . . 1-2/1-3
3-1. Storage Connector .. . . .. .... .. .......... .. 3-1
3-2. Storage Controls ... ... ... .. . . .. . .... . ... .. 3-2
3-3 . Methods of Outputting Data ... .. . ..... . .. . . 3-5
34. Minimum Triggering Rates .... . . . .... . ...... 3-6
3-5. Decoding Output Information for Single
Channel Plug-Ins (3481A3482A , or 3484A) ... 3-6
3-6. Decoding Output Information for the
3485A Scanning Unit .. ... .. . . .... . . ... . .. 3-7
3-7. 3485A/Data Storage Operation for Bursts
of Readings . . . . . . ... . .... . ....... ... . .. 3-8
Number Page
3-8. Improvement in A/D Conversion Accuracy
Using Sample-and-Hold (3482A or 3484A
10 V Range Only) . . .. . .. . ..... . .. . . .. . . . 3-9
3-9 Sample-and-Hold Accuracy (Digitization
Rate
is Limited to 1 kHz) ... . . .... . . .. .. ... 3-9
3-10. 2070A Rear Panel Connector for
Data Storage .. . ... . . . . .. ... . . . . . . . . . .. . 3- l0
5-1. Troubleshooting .. .. . .. . . . . . . .... .. . . . .5-1/5-3
6-1. Replaceable Parts
..... . .... ... ......... 6-2/6-6
iii

Table of Contents Model l l l 80A
LIST OF ILLUSTRATIONS
Number Page
1-1. Data Storage . . . . . . . . . . . . . . . . ... . . . . . . . . . . . 1 -1
3-1. Storage Operations ... . .............. .. . ... 3-3
3-2. Basic Operation of Data Storage ... . .... .. ... . 3-4
3-3. AJump Command
... . .. . .... ... .... . .. . .. 3-4
3-4. Printer Output . .
.. . . . ...... . . ............ 3-4
3-5. Preset Trigger
...... . . .. ..... . . . ..... . .... 3-4
3-6. Measurement Hold
.......... . ..... . .. . .... 3-5
3-7. Computer Control Enable
..... . ......... . .. 3-5
3-8. Data Storage Timing
..... . ........... . . .. .. 3-5
3-9. Printer Format for 2070A Data Logger .
.. ... .. 3-6
3-10. The Printer Format ... .. . .. .... . ... ... .... 3- 7
3-11. Data Storage Used with the 3485A
Scanning Unit
....... . .............. . . ... 3- 7
3-12. Jump Printout .
.. .... . ............ .... ... 3- 7
3-13. Burst Operation . . .
... .. ...... . .... . . . . ... 3-8
3-14. Burst Printout . .
...... . ....... . .. . .. ..... 3-8
3-15. Sample-and-Hold Circuit Position
.... . ........ 3-9
3-16. Sample-and-Hold Technique
......... .. . . . .. . 3-9
3-17. Rear Panel
of the 2070A Data Logger ........ 3-10
3-18. Trigger Source for Single Channel
Plug-Ins
..... . ... ... ....... . .... . .. . .. 3-10
iv
Number Page
3-19. Clearing Data Storage .... .. ...... . . .... ... 3-10
3-20. Response Time Measurement
......... . ..... 3-11
3-21. Preset Trigger Measurement
.. .... .......... 3-11
3-22. Peak Reading
... .. .. . ............ ... .. . .3-12
3-23. Single Input System .
.. ................... 3-12
3-24. Multiple Input System . .
.... . ............ . 3-12
3- 25. Random Sample .. . .. . .. . ....... . .... . ... 3-12
Schematics and Diagrams
7-1. Isolated
BCD .......... . .. .. . . . . ...... 7-3/7-4
7-2.
Basic Storage .. . ....... . ....... . . . .... 7-3/7-4
7-3 . Address Counter, Limits ... . ............. 7-3/7-4
7-4. Preset Trigger, Printer Hold, Computer
Control Enable
.... . ..... . ... .. ....... 7-3/7-4
7-5. Scanner Control, Jump
... .. .... . ... . .... 7-5/7-6
7-6. Panel Transfer, Printer and Dump Hold
Cycling
.... .. .... . .... . ....... .. .... 7-5/7-6 I
7-7 . Inhibit, Turn-On, Continuous Cycle . .. . ... .7-5/7-6
7-8 . Measurement Add, Encode . ... ... ..... .. .7-5/7-6
7-9. Control and Timing
.. ... .. . . . . ..... . ... 7-7/7-8
7-10. Data Output . ...... . ... . ... . ......... . ... 7-9
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Model l l 180A Section I
SECTION
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. The Hewlett-Packard Model 3480A/B Multifunction
Digital Voltmeter may be equipped with Option 005 Data
Storage. Up to 50 complete DVM readings may be entered
into Data Storage at up to 1000 readings per second. The
output
of these stored readings may be governed by an
external device. Data Storage
is ideal for use with a digital
recorder where readings may be taken at high speed, stored,
then outputted at 10 to
20 lines per second.
1-3. Each stored reading includes
all information generated
by the 3480A/B including input voltage magnitude, range,
function, polarity, and overload. The number
of readings
stored
is selectable up to 50. When stored readings are
outputted, two additional digits are added
to identify the
reading number.
All output lines are isolated from the
3480A/B input terminals.
1-4. Option 005 Data Storage includes Isolated
BCD. When
Data Storage is disabled, the output of the 3480A/B
becomes identical to that
of Isolated BCD.
1-5. The 3480A/B offers a wide variety of plug-in units
which may be used with Data Storage. These plug-ins
include the 3481 A with a single 10 V
de range, the 3482A
with 5
de ranges, the 3484A with 5 de ranges, 5 true rms ac
ranges and 6 S1 ranges and the 3485A with up to 50 input
channels plus 3
de ranges.
1-6.
Any of the above capabilities including Data Storage
may be purchased in a self-contained data logger, the
2070A, which includes the 3480A Multifunction DVM, the
5055A Digital Recorder plus any 3480 plug-in. A special
rear panel includes the major Data Storage control lines in
the form
of easy to use switches.
1-7. Accessories Furnished (with Data Storage only).
6 foot "Y" cable with Remote Control lines and BCD lines
split and left unterminated. Other end has 100 pin connec-
tor for Data Storage.
1-8. Accessories Available (with Data Storage only).
-hp- 11181 A: Data Storage Cable for use with 5050B or
5055A Digital Recorders. This
is a "Y" cable with Remote
Control lines split and left unterminated and the BCD lines
terminated with a
50 pin connector for use with a digital
recorder. Other end has 100 pin connector for Data
Storage.
3480A DIGITAL VOLTMETER 3481A BUFFER AMPLIFIER
+I 4 (, r 4
DATA STORAGE
may be used with any combination
of these mainframes and plug-ins.
1 ~1- , · 7 1' (e: 3482A DC RANGE UNIT
..... - .. -
34808 DIGITAL VOLTMETER
l(" I " Ir'
' . I
3484A MULTI-FUNCTION UNIT
2070A DATA LOGGER
3485A SCANNING UNIT
Figure 1-1. Data Storage.
1-1

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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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Model l l l 80A
Table 1-1. Specifications (cont'd).
GENERAL
Isolation characteristics: output data lines and input control lines
are referenced to earth ground (instrument chassis) and are well
isolated
from the measurement input terminals. Instrument will
make float i ng measurements and maintain all Normal and
Common-Mode Rejection specifications when the data and
control lines are utilized .
Operating temperature: o0c to 55°C .
Storage
temperature: - 40°c to + 75°c .
Power: 115 V or 230 V ± 10%, 48 Hz to 440 Hz, 60 VA max
(i ncluding plug-in, options, normal envi ronmental conditions) .
Weights
3480A
basic instrument: 11 lb 2 oz (5,25 kg).
including options: 12 lb 8 oz (5,7 kg.).
shipping:
17 lb (7,65 kg).
34808
basic instrument : 12 lb 12 oz (5,71 kg).
including options : 13 lb 8 oz (6 , 15 kg).
shipping:
18 lb (8,1 kg).
3481A
basic instrument : 2 lb 11 oz (1,2 kg).
shipping : 5 lb (2,3 kg).
3482A
basic instrument: 4 lb (1,8 kg).
i ncluding options : 4 lb 4 oz (1,9 kg).
shipping : 7 lb (3 , 15 kg).
3484A
basic instrument : 4 lb 6 oz (1 , 97 kg).
including options : 6 lb 2 oz (2,76 kg).
shipping: 8 lb (3,6 kg) .
3485A
basic instrument: 5 lb 14 oz (2,6 kg) .
including options : 7 lb 3 oz (3,2 kg).
s
hipping : 8 lb 14 oz (4 kg).
Se ction I
1-3

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Model l l l 80A Section
II
SECTION II
IN STALLATI 0N
2-1. INTRODUCTION.
2- 2. This section contains installation and shipping infor-
mation for the Model l l l 80A.
2-3. INITIAL INSPECTION.
2-4. Each l l l 80A has been carefully inspected prior to
shipment and should be in perfect electrical order and free
of mars or scratches. To confirm this, the instrument
should be inspected upon receipt for damage that might
have occurred in transit or for deficiencies otherwise. If
there is damage due to shipping, file a claim with the
carrier; if there are electrical or mechanical deficiencies not
attributable to shipping, refer to the statement of warranty
on the cover page of this manual. Use the procedures of
Section V to check the instrument performance. Refer to
Section I for the list of equipment supplied with the
instrument.
2-5. INSTALLATION OF 11180A INTO 3480A/B.
IMPORTANT
2-6. Contact your local Hewlett-Packard Sales and Service
Office regarding installation
of the 11l80A into an existing
3480A/B. (See Appendix B for office locations.)
2-7. STORAGE CONNECTOR.
2-8. See Table 3-1 for the signal arrangement at the
Storage Connector.
2-9. REPACKAGING FOR SHIPMENT.
2-10. If the instrument is to be shipped to Hewlett-Packard
for service or repair, attach a tag to the instrument
describing the work to be accomplished and identifying the
owner and instrument. Identify the instrument by serial
number, model number and name in any correspondence. If
you have any questions, contact your local Hewlett-Packard
Sales and Service Office. See Appendix B for office
locations.
2-11. If the original shipping container is to be used, place
the instrument in the container with appropriate packing
meterial and seal the container well with strong tape or
metal bands. A new container may be purchased from your
nearest -hp- Sales and Service Office.
2-12. If an -hp- container is not to be used, then use a
heavy carton or wooden box with an inner container. Wrap
the instrument with heavy paper or plastic and place
cardboard strips across the face for protection before
placing the instrument in the inner container. Use packing
material around all sides of the inner container, and seal the
outer container well with strong tape or metal bands. Mark
the container with "DELICATE INSTRUMENT," or
"FRAGILE".
2-1

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Model l l l 80A Section III
SECTION Ill
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.
3-2. Each stored reading includes all information generated
by the 3480A/B including input voltage magnitude, range,
function, polarity, and overload. Two additional digits are
added to identify the reading number (i.e. numbers 1
through 50). All BCD output lines are isolated from the
3480A/B input terminals. Tables 3-1 and 3-2 describe the
storage control signals and list the pin numbers
of the
control and data signals at
the Storage Connector.
Table 3-1. Storage Connector.
d1~ ........................ ~~~
I()
........................... ~rc')'I
52
I I - • • • • • • • • • • • • • • • • • • • • • • - ' I 75
76~ ••••••••••••••••••••••• ~100
PIN -SIGNAL PIN- SIGNAL PIN -SIGNAL
I - A I} { 26 -CI
2 _
BI Scanner or Storage Units I.D.
27 _
DI
3- I 28- 4
4-2 2· 9-8
5- 10 30- 40
6- 20 Data 31 - 80
7- 100 32 - 400
8- 200 33- 800
9 - 1000 34 - 4000
83 -COMPUTER CONTROL ENABLE
84 -PRESET TRIGGER 0
10- 2000 35 - 8000
11 -OVERRANGE 36 - GROUND
12- GROUND 37- GROUND
13- A RAN(;E} Tens Channel I.D. c( 38 -C RANGE
14- B RANGE on Scanner 39 -GROUND
15- D FUNCTION} 40- RATIO
16- E FUNCTION Range on Scanner 41 -GROUND
17- POLARITY 42- GROUND
18- OVERLOAD 43- GROUND
19- IOA } Storage Tens I.D. < 44- 40A
20- 20A 45
21 46 -MEASURE
22- PRINT INHIBIT 47- INHIBIT
23 48 -STORAGE FLAG
24- GROUND 49
50- GROUND
85
86 - GROUND
87 -INPUT CYCLE HOLD
88
89 -STATUS FLAG
90 -PRESET TRIGGER 20
91 -PRESET TRIGGER 10
92 -JUMP HOLD
93 -MEASUREMENT HOLD
94 -STORAGE HOLD
95 -JUMP
96 -SCANNER CONTROL ENABLE
97 -STORAGE LIMIT 40
98 -STORAGE LIMIT 10
99 -STORAGE LIMIT 20
100 -STORAGE LIMIT 30
II 180A-8- 2496
3-1

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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3-9. Preset Trigger may be used to begin an output cycle.
Triggering
is continuous either from an external source or
internally. When any
of the three Preset Trigger lines are
grounded, the "X" number of previously stored reading is
dumped out plus the next "Y" readings as shown in Figure
3-5. The sum of "X" and "Y"equals the Storage Limit, and
"X" equals ''O", "1 O" , or "20" previous readings. Input
Cycle Hold must be grounded in this mode
of operation.
Input Cycle Hold causes readings
to be continuously
inputted without any output unless given a Preset Trigger.
3-10. Grounding Measurement Hold stops all sampling
both from external and internal trigger sources. It also
inhibits
both input and output storage cycles. Ungrounding
Measurement Hold momentarily as shown in Figure 3-6
causes Data Storage to cycle through one complete input
and output cycle automatically. Triggers equal
to the
Storage Limit are counted automatically.
3-11. Grounding COMPUTER CONTROL ENABLE allows
one line, MEASURE, to be used to gate readings into and
YES
NO
llllOA - l-2Sl3
Section III
out of storage as shown in Figure 3-7. DUMP HOLD or
PRINTER HOLD-OFF are no longer needed to gate
readings out. The nature of STORAGE FLAG also changes
to acknowledge each MEASURE for both storage and
output cycles. This mode of operation was designed for
computer systems or systems with a limited number
of
control lines. The timing for Data Storage running at a
50 kHz output rate is shown in Figure 3-8.
3-12. The question is which method
of storing readings
should be used for various applications?
If the trigger
source counts the triggers (i.
e. triggers from the 3485A
Scanni ng Unit are automatically counted), then the output
cycle begins more or less automatically.
If the trigger source
is free running, one of the Preset Trigger lines may be used
or Measurement Hold may be used. The Preset Trigger has
the advantage since the
DVM may be triggered prior to a
storage cycle to allow the proper range and function to be
set up manually. Preset Trigger requires exactly the same
type of input as any other trigger and is most likely to be
compatible with a given system. Figure
3-1 should make
this selection clear.
OUTPUT IS
AUTOMATIC
USE SCANNER
~-----1 CONTROL ENABLE TO
START OUTPUT
USE JUMP
TO START
OUTPUT
START STORAGE ANO
OUTPUT CYCLE BY
UNGROUNDING MEASUREMENT
HOLD
USE PRESET
TRIGGER "O"
.---------f (INPUT CYCLE
HOLD GROUNDED)
USE PRESET TRIGGER
~----I "10" OR "20" (INPUT
CYCLE HOLD GROUNDED)
Figure 3-1. Storage Operations.
3-3

Section III
INTERNAL OR EXTERNAL TRIGGERS (UP TO 1000/S)
STORAGE FLAG (FROM DVM)
16TO 20,..s
~~~~~- -~~~--1 · r--~~--"'-"1~~~~~
I
PRINTER HOLD-OFF (TO DVM) I
~:-.--iU
STA TU S FLAG (FROM OVMI
STORAGE CYCLE
10, 20 , 30,40 , or 50 READINGS
DEPENDING ON ST ORAGE UNIT
l lll!IOA- 8 -251 ..
TIME TO P RINT
(50TO 100ms)
OUTPUT CYCLE
10.20. 30 , 40 , OR 50 READINGS
DEPENDING ON STORAGE UNIT
0 00
Figure 3-2. Basic Operation of Data Storage.
Basic operation of Data Storage uses Storage Flag to indicate when
readings are ready. Printer Hold-Off
is used with digital recorders for
automatically outputting data. Dump Hold (not shown) is identical
but of opposite sense. Status Flag indicates if Data Storage is storing
or outputting data.
INTERNAL OR EXTERNAL TRIGGERS (UP TO 1000 / s)
-i n I ---uu----
~ 0 :
NUMBER OF READINGS
1
LESS THAN STORAGE UMIT DELAY ;;. 50 µs
JUMP (TO DVM)
STORAGE FLAG !FROM DVM)
I
I
PRINTER HOLO·OFF ( TO OV~I- _ ___r--u--
1 STATUS FLAG (FROM DVMl
llJIOA- 8-2515
STORAGE CYCLE
OUTPUT CYCLE
10 .20,30.40. OR 50 READINGS
DEPENDING ON STORAGE LIMIT
Figure 3-3. A Jump Command.
A Jump command may be used to output a non-multiple of 10
readings. In this case, the number of readings is less than Storage
Limit. After all triggers have been issued, a Jump is given to begin an
output cycle; otherwise, storage will wait for the remaining triggers
required
to fill up to the Storage Limit. The last reading is repeated
to fulfill the number set by Storage Limit.
3-4
STORAGE
LIMIT= 10
1050014679
0950014679
0850014679
0750014679
0650012437
0550001956
0450002458
0350011400
0250010499
0150009567
11110&-1-2011 POLARITY/OVERLOAD
Model l 1180A
}
7th READING REPEATED
3 TIMES WHEN
JUMP IS ISSUED
Figure 3-4. Printer Output.
Printer output on a 2070A Data Logger when 7 de readings are
made
on the 100 mV range, stored, and printed out. Since the
number of readings is less than the Storage Limit, a Jump must be
issued
to begin the output cycle. Note that the 7th reading is
repeated three times.
EXTERNAL TRIGGERS WP TO 1000 / sl
1IULJ ooo 1JlJ1J1Jliljo oo
I
INTERNAL TRIGGERS (UP TO 40 / s)
1IUlf ooo lILilJu---
STORAGE FLAG
PRINTER HOLO·OFF
INPUT CYCLE
ICON TINUOUSL Y INPUTS READINGS
INTO STORAG E!
INPUT CYCLE HOLD (GROUNOEOJ
PRESET TRIGGER "O"
l lllOA·B-2!117
OUTPUT CYCLE
(OUTPUTS 10 , 20. 30 . 40 . OR 50
READINGS!
Figure 3-5. Preset Trigger.
Preset Trigger "O" may be used to automatically start one complete
storage and output cycle. Triggers may be external or internal. Input
Cycle Hold must be grounded. The number of readings taken will
equal
the Storage Limit. The DVM samples prior to a Preset Trigger
at the rate of the trigger source. This allows the user to make
manual adjustments on his system.
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1JiJCF:•::
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1JiJulJLrlrooo
I OR
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tnJ[f:·: · ~lil_r----
STORAGE FLAG ( FROM OVM)
PRINTER HOLD · OFF ITO OVM )
INPUT CYCLE
110,20,30, 40 , 0R 50TRIGGERS
AUTOMATICALLY ACCEPTED I
TIME TO PRIN T
> 5~1 MEASUREMENT HOLD UNHIBITS SAMPLING BUT AL L OWS
ONE INPUT AND OUTPUT CYCLE TO TAKE PLACE)
l ll lOA - 1-2' 11
OUTPUT CYCLE
Figure 3-6. Measurement Hold.
Measurement Hold may be used to automatically start one complete
storage and output cycle by breaking this line momentarily.
Sampling does not take place prior to or after a storage cycle. The
proper number
of triggers equal to the Storage Limit are counted
automatically .
MEASURE
UP TO 1000 /s
UP TO 50 , 000 /s
~~~~~~~~~~~~,--------"----.
;> 1 ms
.. 20µs
flfiJ UuulJ
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1
STATUS FLAG
I
~____.I
INPUT CYCLE
OUTPUT CYCLE
STORAGE ENABLE
} '"""""'"
COMPUTER CONTROL ENABLE
INTERNAL MEASURE INHIBIT
STORAGE LIMIT ("10" "20" OR "40"1
Figure 3-7. Computer Control Enable.
COMPUTER CONTROL ENABLE may be grounded to allow
readings to be gated into storage and out-of storage using the same
line (MEASURE) . PRINTER HOLD-OFF is no longer needed.
STORAGE FLAG acknowledges each MEASURE in both storage
and
output cycles.
Section III
MEASURE
III IOA-8-2527
I
I
17T022µs
16 TO 20µs
•
v
1 TO 2µs
Figure 3-8. Data Storage Timing.
Data Storage running at a 50 kHz output rate. Each low going
Measure is acknowledged
with a high going Storage Flag. The
Storage Flag remains high 16 to 20 ms. Continuous Cycle is
grounded to achieve this speed.
Table 3-3. Methods of Outputting Data.
Lines Used Trigger Requirement
Triggers = Storage
Limit
10,20,30,40,orSO
Jump Triggers < Storage Limit
Last reading repeated to fill
Storage Limit
Preset Trigger Trigger source may free run
"O", "1 O", or " 20"
Triggers counted automatically
Input Cycle Hold DVM samples before and during
Grounded storage
but not while printing
Measurement Hold
Trigger source may free run
Released from
Triggers counted automatically
Ground
DVM samples only when storing
3-13. OPERATION WITH SINGLE CHANNEL PLUG-INS.
3-14. There are 3 single channel plug-ins available for use
with the 3480:
3481A Single 10 V de range
3482A 5 de ranges from 100 mV to 1000 V
3484A 5 ac or de ranges from I00 mV to I000 V
6 ohms ranges from I00 il to I0 Mil.
3-5

•.:
Section III
3-15. In either de or ohms, these plug-ins are able to make
1000 correct readings/s. Within 1 ms, the 3480 is able to
respond to a full-scale change and digitize. These single
channel plug-ins combined with the 3480 main frame are
able to act like a low cost, 1 kHz A-to-D converter. Data
Storage allows up to 50 readings taken at up to 1000/s to
be stored and printed.
3-16.
As shown in Table 3-4, these plug-ins contain their
own sample-rate oscillator able to take from 1 reading/s up
to approximately 40 readings/s. These plug-ins must
be
externally triggered (throu p, h the main frame) to achieve
higher sampling rates.
Table 3-4. Maximum Triggering Rates.
Internal External
3481A <(40/s*
<( 1000/s
3482A <(40/s*
<( 1000/s
3484A <(40/s* <( 1000/s
*Variable front panel sample-rate control, not calibrated.
3-17. Data Storage stores all of the information normally
available from the 3480. Figure 3-9 shows what infor-
mation
is printed and the format. The format shown
applies to the 2070A Data
Logger which rearranges the
columns into an easier to read order. Decoding for this
information
is given in Table 3-5.
0 5 4 0 1 1 1 4 2 9
STORA~J l
1
REA~ING
1
l.D.
RANGE FUNCTION
STORAGE ENABLED
POLARITY/OVER LOAD
x 0 4 0 1 1 1 4 2 9
RANDOM] l~
NUMBER READING
ZERO FUNCTION
STORAGE
NOT ENABLED
RANGE
lllSOA-B-2520
POLARITY /OVERLOAD
Figure 3-9. Printer Format for 2070A Data Logger.
The printer format for a 2070A Data Logger equipped with Data
Storage and a single channel plug-in (3481
A, 3482A or 3484Al. The
first two columns of the print out on a 2070A Data Logger lose
meaning when Storage is not enabled. The remaining columns
remain the same .
3-6
Model l l l 80A
Table 3-5. Decoding Output Information for
Single Channel Plug-Ins (3481 A, 3482A, or 3484A).
Range Code
100mV
1oon 5
1000 mV 1ooon 4
10V
10 kn
3
100 v
100 kn
2
1000 v
1000 kn 1
10Mn 0
Function
Code
VDC
0
AC (AC) 1
OHMS 2
AC (DC) 3
DC RATIO
4
AC (AC)
RATIO 5
OHMS RATIO
6
AC (DC) RATIO 7
Polarity/Overload Code
POSITIVE 0
NEGATIVE
1
POS. OVER LOAD
2
NEG. OVERLOAD
3
3-18. OPERATION WITH SCANNING UNIT.
3-19. The 3485A Scanning Unit may be used to scan up to
50 2-wire input and measure each input on ranges from
100 mV to 10 V. This scanner is designed for low level
transducer applications and uses FET switches to achieve a
speed
of 1000 channels/s.
3-20. Data Storage allows the speed of the 3485A Scanning
Unit to be used economically with a printer. Up to 50
channels may be scanned and stored in 50 ms then printed
out at 10 lines/s.
3-21. The 3485A may be programmed to scan at any
of six
rates from 1 channel/s to 1000 channels/s as selected on the
front panel using Channel Delay. Any number
of channels
up to 50 may be scanned using
Last Channel settings on the
front panel.
3-22. Figure 3-10 shows whatinformation
is printed and the
format. The format shown applies to the 2070A Data
Logger which rearranges the columns into an easier to read
order. Decoding for this information
is shown in Table 3-6.
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STD RAGE ENABLED
1 5 1
204068
STORAGE l.D.
L.,JJ
TENS CHANNEL 1.0 .
l
~
RANGE
POLARITY AND
OVERLOAD
STORAGE NOT ENABLED
x 5 1 1 2 0 4 0 6 8
RANDOM
NUMBER
JI
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~
RANGE
CHANNEL 1.0 .
BACKWARDS
II llOA-1-2521
POLARITY AND
OVERLOAD
Figure 3-10. The Printer Format.
3-23. When
the number of channels to be scanned does not
equal the Storage Limit, grounding Storage Enable will
cause Data Storage
to jump to an output cycle after the last
channel has been scanned as shown in Figure 3-11. The
reading
on the last channel is repeated until the Storage
Limit
is reached as shown in the printout in Figure 3-12.
Table 3-6.
Decoding
Output Information for the 3485A Scanning Unit.
Range
Code
100 mV
0
1000 mV
1
lOV
2
Polarity/Overload
Code
POSITIVE
0
NEGATIVE
1
POSITIVE OVERLOAD
2
NEGATIVE OVERLOAD
3
Section III
PROGR AM INITIA TE ( TO SC AN NER )
17 TRI GG ER S
L AST CH ANN EL "' 17 JUMP
FR OM SCA NNER TO
I c:: ST ORA GE ST AR TS OUTPUT
~CYC LE
5µs 16TO 20 µs
ST ORAG E FL AG (F ROM OVM) /\ r"'i
______;_.,;..__;___~u · ..-----~u-0 00
PRINTE RHO LD - OFF (TO O VM)
LJooo
STORA GE EN A BLE (G RO UN DED )
SC AN NER EN ABLE ( GR O UNDED )
S TOR A GE LIMIT "20" LINE ( GROUNDED )
11180A-B -2 5 22
20 REA DING GA TED O UT
STO RA GE LIMIT " 20
Figure 3-11. Data Storage Used with the 3485A
Scanning Unit.
Data Storage used with the 3485A Scanning Unit where a
non - multiple of 10 channels is· scanned, in this case, 17 channels .
Scanner Enable must be grounded. When Chan:iel 17 is reached,
storage jumps ahead to the Storage Limit setting , in this case 20 .
Outputting begins with the 17th reading repeated 3 times for a total
of 20 readings.
17th READING
{
2
000112 3 41
REPEATED l 9 0 0 1 1 2 3 4 1
3
TIMES 1 8 0 0 1 1 2 3 4 1
1710112 3 41
LAST CHANNEL/ 1 6 1 0 1 0 9 7 7 4
1510100167
1410111245
1310009467
1210201140
1 l 1 0 1 0 1 4 2 l
1010210456
090101 1 992
0801001875
0700200509
0600111121
0501110025
0401101125
0301201489
0200001232
0100101379
STOR::J L READING
l.D.
TENSCHANNELl .D. RANGE
POLARITY / OVER LOAD
lllSOA-B-2523
Figure 3-12. Jump Printout.
The 3485A Scann ing Unit used with Storage in a 2070A Data
Logger for scanning 17 channels (Storage Limit= 20; Last
Channel = 17). Scanner Enable must be grounded so that the
scanner may issue a Jump when 17 channels have been scanned.
Note that the 17th r eading is repeated 3 times . The Tens Channel
l.D. reverts
to zero during the repeated readings.
3-7

Section III
3-24. The 3485A may
be programmed to take bursts of
readings across the same channels, store each burst then
output
all readings. The number of channels scanned must
be divisible into the Storage Limit an integral number
of
times. For example, 2 bursts of 10 channels with Storage
Limit =20. Table 3- 7 illustrates the different combinations.
A timing example
is shown in Figure 3-13 with a printout
in Figure 3-14.
Table 3-7.
3485A/Data Storage Operation for Bursts of Readings.
3485A
Last Channel Storage Limit Number
Setting Setting of Bursts
5
10 2
5
20
4
5
30
6
5
40 8
5
50 10
10 20
2
10 30
3
10 40 4
10
50
5
25 50 2
2
10
5
2
20 10
2 30
15
2 40 20
2 50
25
3
30 10
4
40
10
IHURNALTlllGGUlfWITHINSCAfOIE;:.Rl-------------
l.J1•IURST LJ 2ndBURST
I OCHA NNEL S
I NO .JTHROUGHN0. 10 ) !OCHANNHS
(
NQ . lTH A OUG HN0 . 101
f--OUT PUT -
"'"1 n I
~-------~ ~------~·
STORAGEflAG (fRO MD VM) lflrl0···
PlllliTEAHOLO ·O HITOOVMI
_____ ___,11.flf-··
INl'UT CYCLE , 21 URSTSOF 10 CHANNEl$
-~ "' ~"':GE~l~'"'-'-' ·· "-20 · __ }GROUNDED
Figure 3-13. Burst Operation.
O UTl'UT CY ClE
2011f AOI NGS
Data Storage may be used to store bursts of scanned readings from
the 3485A Scanning Unit. In this case, two bursts of 10 channels are
stored. Separate Program
Initiate commands are given to the scanner
to start the scanning sequence. Ready indicates when the scanner
may be given its
next Program Initiate. The Storage Limit is set to
"20" to input and output 20 readings.
3-8
2ND BURST OF
25 CHANNELS
PROGRAM INITIATE --
IST BURST Of
25 CHANNELS
PROGRAM INITIATE --
llllOA-1-1525
5020604328
4 9 2 0 6 0 4 5 0 9
4820604292
4 7 2 0 6 0 4 0 5 8
4 6 2 0 3 0 5 6 4 9
4 5 2 0 2 0 4 5. 8
4410204519
4310204353
4210604132
4110701062
4010701753
3910701713
3810301673
3710301741
3610301658
3 5 1 0 7 0 1 7 7 1
3400701679
3300700679
3200300319
3100305199
3000704653
2900701459
2800704120
2 1 0 0 1 0 1 5 0 0
2600301010
2520601 510
2420601512
2320601621
2220601482
2120201440
2020205572
1910205032
1810205160
1 7 1 0 6 0 4 1 7 1
1 6 1 0 6 0 5 1 7 0
1510605060
1410605681
I 3 1 0 2 0 5 4 9 0
12 10204180
1110204409
1 0 1 0 6 0 I 0 4 0
0900601190
0800604070
0700601180
0600201072
0500201632
0400201392
0300601271
0200600033
0100601423
Figure 3-14. Burst Printout.
Model 1l l 80A
The print-out on a 2070A is shown for scanning two bursts of 25
channels then outputting all 50 readings (Storage Limit = 50; Last
Channel= 25). Note how the 10's Channel l.D. helps identify each
burst.
3-25. SAMPLE-ANO-HOLD IMPROVES DIGITIZING.
3-26. The successive approximation technique used for
A/D conversion in the 3480
is limited in its ability to
accurately digitize a changing input voltage. This limit
is
equal to 10% of the full-scale voltage range/s or on the 10 V
range, 1 V/s. This translates to a 0.018 Hz sine wave
digitized to ± 0.01%accuracy.
3-27. Sample-and-hold may
be added to the 3480 main
frame
as shown in Figure 3-15. Sample-and-hold takes the
changing input
signal conditioned by the plug-in and holds
it just prior to A/D conversion. The A/D converter,
therefore, looks at a
de level which represents the signal
level at the time of the sample as shown in Figure 3-16.
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