Keithley 182 User Manual

Model 182 Sensitive Digital Voltmeter
Quick Reference Guide
A GREATER MEASURE OF CONFIDENCE
INTRODUCTION
This quick reference guide includes summary information on front panel operation and IEEE-488 operation for the Model 182 Sensitive Digital Voltmeter . For detailed Model 182 information, consult the Model 182 Instruction Manual.
©
1990, Keithley Instruments, Inc.
All Rights Reserved
Cleveland, Ohio, U.S.A.
Document Number: 182-903-01 Rev. B
1
TABLE OF CONTENTS
SAFETY PRECAUTIONS ....................................... 3
CONTROL SUMMARY ........................................... 8
TEST CONNECTIONS ......................................... 14
DEVICE DEPENDENT COMMANDS ................... 15
DATA FORMATS ................................................... 23
SRQ MASK AND SERIAL POLL BYTE................. 25
ALTERNATE OUTPUT WORD FORMATS........... 26
2
SAFETY PRECAUTIONS
The following safety precautions should be observed before using this product and any associated instru­mentation. Although some instruments and accesso­ries would normally be used with non-hazardous volt­ages, there are situations where hazardous conditions may be present.
This product is intended for use by qualified person­nel who recognize shock hazards and are familiar with the safety precautions required to avoid possible in­jury. Read the operating information carefully before using the product.
The types of product users are: Responsible body is the individual or group respon-
sible for the use and maintenance of equipment, for ensuring that the equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument. They must be pro­tected from electric shock and contact with hazard­ous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, and perform safe installations and repairs of products.
3
Only properly trained service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Installation Category I and In­stallation Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC
60664. Most measurement, control, and data I/O sig­nals are Installation Category I and must not be di­rectly connected to mains voltage or to voltage sources with high transient over-voltages. Installation Category II connections require protection for high transient over­voltages often associated with local AC mains con­nections. The user should assume all measurement, control, and data I/O connections are for connection to Category I sources unless otherwise marked or described in the Manual.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable con­nector jacks or test fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS,
42.4V peak, or 60VDC are present. A good safety prac­tice is to expect that hazardous voltage is present in any unknown circuit before measuring.
Users of this product must be protected from electric shock at all times. The responsible body must ensure that users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product users in these circumstances must be trained to pro­tect themselves from the risk of electric shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.
4
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with im­pedance limited sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connected to a properly grounded power re­ceptacle. Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks be­fore each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input power disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is ap­plied to the circuit under test. AL W A YS remove power from the entire test system and discharge any capaci­tors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or remov­ing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth) ground. Always make measure­ments with dry hands while standing on a dry, insu­lated surface capable of withstanding the voltage be­ing measured.
The instrument and accessories must be used in ac­cordance with its specifications and operating instruc­tions or the safety of the equipment may be impaired.
5
Do not exceed the maximum signal levels of the in­struments and accessories, as defined in the specifi­cations and operating information, and as shown on the instrument or test fixture panels, or switching card.
When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield con­nections for measuring circuits, NOT as safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe opera­tion requires the use of a lid interlock.
If a screw is present, connect it to safety earth ground using the wire recommended in the user documenta­tion.
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the com­bined effect of normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.
The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read the associated information very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the warranty.
6
Instrumentation and accessories shall not be con­nected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety approvals, may be used if the rating and type are the same. Other components that are not safety related may be pur­chased from other suppliers as long as they are equiva­lent to the original component. (Note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability of a replace­ment component, call a Keithley Instruments office for information.
T o clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Prod­ucts that consist of a circuit board with no case or chas­sis (e.g., data acquisition board for installation into a computer) should never require cleaning if handled according to instructions. If the board becomes con­taminated and operation is affected, the board should be returned to the factory for proper cleaning/servicing.
7
CONTROL SUMMARY
RANGE
Use UP and DOWN to manually select desired mea­surement range; 3mV, 30mV, 300mV, 3V, or 30V. Present range is displayed on status line.
Press AUT O to turn auto-range on or off. Unit upranges at overflow point (±3,029,999 counts) and downranges at 9.33% of full range when AUTO is enabled.
Use FILTER to enable or disable both digital and ana­log filters simultaneously (actual filter configuration or response depends on MENU FILTER selections).
REL
Press REL READING to store current reading as baseline. Subsequent readings will be the difference between the applied signal and the stored baseline.
Press REL OUTPUT to store current analog output value as analog output baseline. Analog output value will be the difference between the normal, non-relative output value and the stored analog output baseline.
TRIG
Press SETUP to program TRIGGER MODE, TRIG­GER SOURCE, TRIGGER DELAY, AND TRIGGER INTERVAL.
8
Use or to scroll through selections, ENTER to select, or ESC to cancel selection.
TRIGGER MODE: select multiple (continu­ous with one trigger) or one-shot (one read­ing per trigger).
TRIGGER SOURCE: select external, manual, disabled, or IEEE-488 X, GET or talk triggers.
TRIGGER DELAY: program desired trig­ger delay (time between trigger and read­ing in one-shot trigger mode): 0sec-
999.999sec. TRIGGER INTERVAL: program desired
trigger interval (time between individual readings in multiple trigger mode): 0.01 sec-999.999sec.
BUFFER
Use STORE to start/stop buffer data storage. Store size of 1-1024 selects linear buffer (storage stops when size limitation is reached); store size of 0 selects cir­cular buffer (buffer wraps around and overwrites old data after 1024 readings are stored). Unit stores read­ings at programmed trigger interval in multiple trigger mode or one reading per trigger in one-shot trigger mode.
Press RECALL to access stored buffer readings and buffer statistics. Readings include buffer location and time stamp. Statistics include number of samples, buffer average, maximum, minimum, and standard deviation.
9
SELECTION
Use or to scroll through MENU, SETUP, and RE­CALL selections. Press ENTER to choose displayed selection and move down one menu level (where ap­plicable). Press ESC to cancel displayed selection and move up one menu level (where applicable).
Use MENU to access operating modes summarized below.
MENU Message Description
FILTER Set digital filter response,
analog filter on/off
INTEGRATION Set A/D integration period TIME (3msec, line cycle, or
100msec)
DISPLAY Set display resolution to RESOLUTION 3 1/2, 4 1/2, 5 1/2, or 6 1/2
digits READING REL Program reading relative value OUTPUT Set analog output gain and
relative value SETUP Save user setup, recall user or
factory default setup SET IEEE Select IEEE-488 primary
ADDRESS address (0-30) CALIBRATE Display test, calibrate Model
182, configure analog output
for normal or source
10
Press LOCAL to cancel remote (REM on) when the instrument is used over the IEEE-488 bus. LOCAL will be locked out when the bus LLO command is in effect.
FACTORY DEFAULT CONDITIONS
Description Default State
Range 30V, auto-range off Reading relative Off, value =0V Analog Filter Off Digital Filter On, medium response Buffer Off, size = 0000 (wrap around) Analog Output Relative off, value: 0V, gain: 1.0,
normal output, source value
= 0V Primary Address 7 Integration Period Line cycle (16.67msec @ 60Hz,
20msec @ 50Hz) Display Resolution 6 1/2 digits Trigger Mode Multiple Trigger Source External (MANUAL key also
operative) Trigger Interval 0.25sec Trigger Delay 0sec Calibration Lock On (calibration locked)
NOTE: All listed operating states except buffer status, primary address, and calibration lock status can be saved as user configuration using MENU save user setup selection. Primary address can be saved using MENU SET IEEE ADDRESS selection.
11
ERROR MESSAGES
Command
Command Option
Command Format
programmed
reading (one-shot only)
for range
self-test
self-test
Press a key to continue
12
U1 Bit Display Message Description Type
Number*
0** INVALID COMMAND Invalid Device-Dependent Momentary
1** INVALID OPTION Invalid Device-Dependent Momentary
2** INVALID FORMAT Invalid Device-Dependent Momentary
3** NOT IN REMOTE Unit not in remote when Momentary
4 TRIGGER OVERRUN Unit triggered while processing Momentary
5 OVERFLOW Input signal too large Momentary
6 NVRAM ERROR NVRAM error found during Latching
7 RAM ERROR RAM error found during Latching
8 UNCALIBRA TED Unit not calibrated Latching
when calibration unlocked
calibration locked
Front panel microcontroller Latching
communications failure
communications failure
U1 Bit Display Message Description Type
Number*
9 CAL RUNNING Invalid command or operation Momentary
10 CAL LOCKED Calibration attempted with Momentary
Press a key to continue for applied signal
11 CAL ERROR Improper calibration value Latching
12 Reserved
13 Reserved
FRONT P ANEL FAILURE
14
15 A/D COMM FAILURE A/D microcontroller Latching
16 TRIGGER NOT READY Unit not ready for trigger Momentary
Number corresponds to bit position in U1 error word. *
** IEEE-488 bus-only errors. INVALID FORMAT and INVALID OPTION commands display error type on
lower line.
13
TEST CONNECTIONS
Note: Use only clean copper-to-copper
connections to minimize thermals
Low thermal cable
(Model 1506 or Equivalent)
KEITHLEY
182 SENSITIVE DIGITAL VOLTMETER
182.3165 mV
Range 300mV
POWER RANGE REL TRIG BUFFER SELECTION INPUT
UP AUTO
READING
SETUP
01 2 3 4
DOWN FILTER
OUTPUT
MANUAL
56 7 8 9
Red
Voltage being measured
Black
Figure 1. Typical Test Connections
TRG SRC
REM TALK LSTN
STORE
MENU
LOCAL
CAL
.
RECALL
ENTER
ESC
350V
LO
MAX
Caution
Maximum Input: 35V continuous WARNING: Maximum common-mode
voltage: 350V peak
INPUT
30V MAX
120V for 10 seconds
14
DEVICE DEPENDENT COMMANDS
NOTE: Corresponding lower-case command letters may be used in place of upper-case command letters.
Display ASCII String
A0 Restore display to normal A1, string Display string A2, string Display string and store in EEROM A3 Display string stored in EEROM
NOTE: String must be surrounded by single quotes.
Display Resolution
B0 5 1/2 digit resolution B1 6 1/2 digit resolution B2 3 1/2 digit resolution B3 4 1/2 digit resolution
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Measure and Analog Output Source Calibration
C0, value Calibrate measure positive full scale C1, value Calibrate measure negative full scale C2 Calibrate measure zero offset C3, value Calibrate divider full scale C4 Calibrate divider zero C5 Select positive full scale output C6, value Calibrate positive full scale output C7 Select zero output value C8, value Calibrate zero output with value
Filter Damping
D0 Turn filter damping off (same as P2) D1 Turn filter damping on (same as P3)
Reading Source
F0 Latest reading from A/D converter F1 One reading from buffer F2 All readings in buffer F3 Maximum value in buffer F4 Minimum value in buffer
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Reading Format
G0 Reading only G1 Reading with prefix G2 Reading with buffer location G3 Reading with buffer location and prefix G4 Reading with time stamp G5 Reading with time stamp and prefix G6 Reading with time stamp and location G7 Reading with time stamp, location, and prefix
Immediate Trigger and Self-test
H0 Initiate manual trigger H1 Perform memory test
Buffer Configuration
I0 Disable buffer I1, value Buffer on, linear length=value I2 Buffer on, circular length=1024
Analog Output Relative
J0 Disable analog output relative J1 Enable analog output relative using next
J2, value Enable analog output relative using value J3 Enable analog output relative, use present
reading
value
17
EOI, Bus Hold-off on X
K0 Enable EOI, enable bus hold-off on X K1 Disable EOI, enable bus hold-off on X K2 Enable EOI, disable bus hold-off on X K3 Disable EOI, disable bus hold-off on X
Save and Recall Setup
L0 Save current setup as power-on L1 Recall factory default setup L2 Recall power-on setup
SRQ Mask
M0 Disable SRQ M1 Reading done M2 Buffer half full M4 Buffer full M8 Reading overflow M16 Ready for command M32 Error M128 Ready for trigger
Enable/Disable Analog and Digital Filters
N0 Filters off N1 Filters on
18
Analog Filter Configuration
O0 Configure analog filter off O1 Configure analog filter on
Digital Filter Configuration
P0 Configure digital filter off P1 Configure fast response P2 Configure medium response P3 Configure slow response
Trigger Interval
Qvalue Interval=value in msec (10-999 999msec)
Range
R0 Enable auto-range R1 3mV range R2 30mV range R3 300mV range R4 3V range R5 30V range R6 No function R7 No function R8 Disable auto-range
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Integration Period
S0 Line cycle integration period S1 3msec integration period S2 100msec integration period
Trigger Mode and Source
T0 Multiple on talk T1 One-shot on talk T2 Multiple on GET T3 One-shot on GET T4 Multiple on X T5 One-shot on X T6 Multiple on external T7 One-shot on external T8 Multiple on manual (MANUAL key or H0X) T9 One-shot on manual (MANUAL key or H0X) T10 Disable all triggers
20
Alternate Output
U0 Send machine status U1 Send error conditions U2 Send firmware revision U3 Send buffer length U4 Send buffer average U5 Send buffer standard deviation U6 Send reading relative value U7 Send analog output relative value U8 Send analog output gain value U9 Send trigger interval U10 Send trigger delay U11 Send calibration constants U12 Send calibration lock status U13 Send Model 181-like machine status U14 Send ASCII text string
Analog Output Mode, Gain, and Output Value
V0, gain Normal mode, gain (.001-999 999.999) V1, value Source mode, output=value (-3.3 to +3.3)
Trigger Delay
W0 Disable trigger delay Wvalue Enable trigger delay , delay=value
(1msec to 999 999 msec)
21
Execute
X Execute other device-dependent commands
Terminators
Y0 <CR LF> Y1 <LF CR> Y2 <CR> Y3 <LF> Y10 <CR LF> Y13 <LF CR>
Reading Relative
Z0 Disable reading relative Z1 Enable reading relative using next reading Z2, value Enable reading relative using value Z3 Enable reading relative, use present value
22
DATA FORMATS
Prefix
(G1, G3, G5, G7)
Mantissa Exponent
Buffer
Location
(G2, G3, G6, G7)
Time
Stamp
(G4, G5, G6, G7)
NDCV+1.820000E+00, 0000, 000000.000<term+EOI>
Field Separators
DCV = Normal Reading MAX = Maximum buffer reading (F3) MIN = Minimum buffer reading (F4)
N = Normal O = Overflow R = Relative enabled
Notes : 1. Buffer location and time stamp
fields show all 0s for all readings (F0).
2. Time stamp is elapsed time from first trigger after buffer is enabled.
Figure 2. Reading Format
23
Prefix Mantissa Exponent
Buffer
Location
Time
Stamp
NMAX+1.820000E+00, 0001, 000000.00<term+EOI>
Notes : 1. G7 reading format shown. Presence of
prefix, buffer location, and time stamp depends on selected data format.
2. Buffer location and time stamp values are at location of maximum buffer reading.
Figure 3. Maximum Buffer Value Format
Prefix Mantissa Exponent
Buffer
Location
Time
Stamp
NMIN+1.820000E+00, 0001, 000000.00<term+EOI>
Notes : 1. G7 reading format shown. Presence of
prefix, buffer location, and time stamp depends on selected data format.
2. Buffer location and time stamp values are at location of minimum buffer reading.
Figure 4. Minimum Buffer Value Format
24
SRQ MASK AND SERIAL POLL BYTE
Decimal Weighting
1 = Ready for Trigger
1 = Ready for Command
128 64 32 16 8 4 2 1
Bit Position
B7 B6 B5 B4 B3 B2 B1 B0
1 = RQS
1 = Error
Note : Bit 6 (RQS) not used in SRQ mask
1 = Reading Done 1 = Buffer Half Full
1 = Buffer Full
1 = Reading Overflow
Figure 5. SRQ Mask and Serial Poll Byte Format
25
ALTERNATE OUTPUT WORD FORMATS
Model
Number
182B1F0G1I0J0K0M000N1O0P2R5S0T06V0Y0Z0<term + EOI>
B (Resolution)
0 = 5 1/2 1 = 6 1/2 2 = 3 1/2 3 = 4 1/2
K (EOI)
0 = EOI, hold-off on 1 = EOI off, hold-off on 2 = EOI on, hold-off off 3 = EOI off, hold-off off
S (Integration)
0 = Line cycle 1 = 3msec 2 = 100msec
F (Data Source)
0 = A/D 1 = Single Buffer 2 = Full Buffer 3 = Maximum Buffer 4 = Minimum Buffer
Note: Default values shown
M (SRQ)
000 = Disabled 001 = Reading Done 002 = Buffer half full 004 = Buffer full 008 = Reading overflow 016 = Ready for command 032 = Error 128 = Ready for trigger
T (Trigger)
00 = Multiple on talk 01 = One-shot on talk 02 = Multiple on GET 03 = One shot on GET 04 = Multiple on X 05 = One-shot on X 06 = Multiple on external 07 = One-shot on external 08 = Multiple on manual 09 = One-shot on manual 10 = All triggers disabled
Figure 6. U0 Word Format (Machine Status)
26
G (Data Format)
0 = Reading only 1 = Prefix 2 = Location 3 = Location prefix 4 = Time stamp 5 = Time stamp, prefix 6 = Time stamp, location 7 = Prefix, location, and time stamp
N (Filters)
0 = Off 1 = On
V (Output Configure)
0 = Normal 1 = Source
I (Buffer)
0 = Disabled 1 = Linear 2 = Circular
P (Digital Filter)
0 = Disabled 1 = Fast 2 = Medium 3 = Slow
,
O (Analog Filter)
0 = Off 1 = On
Y (Terminator)
0 = <CR> <LF> 1 = <LF> <CR> 2 = <CR> 3 = <LF>
J (Output Relative)
0 = Disabled 1 = Enabled, use next reading 2 = Enabled using value 3 = Enabled using present value
R (Range)
0 = Auto 1 = 3mV 2 = 30mV 3 = 300mV 4 = 3V 5 = 30V
Z (Reading Relative)
0 = Disabled 1 = Enable using reading 2 = Enabled using value 3 = Enabled using present value
U0 Word Format (Machine Status) (Cont.)
27
Error Prefix
Bit 0
Reserved
Bit 16
ERR000000000000000000000<term+EOI>
1 = Invalid Command Error
1 = Invalid Format Error
1 = Invalid Option Error
1 = Not in Remote Error
1 = Trigger Overrun Error
1 = Overflow Error
1 = NVRAM Error
1 = RAM Error
1 = Uncalibrated Error
1 = Trigger not Ready Error
1 = A/D Com Failure Error
1 = Front Panel Failure Reserved Reserved
1 = Cal Error
1 = Cal Locked Error
1 = Cal Running Error
Figure 7. U1 Word Format (Error Status)
Front Panel
Processor
REVA01<sp><sp>, A0I<sp><sp>, A0I<sp><sp><term+EOI>
sp = space
A/D
Processor
Main
Processor
Figure 8. U2 Word Format (Firmware Revision)
28
Programmed Buffer Length
(1 - 1024)
Length
Identifier
LEN0000<term+EOI>
Figure 9. U3 Word Format (Buffer Length)
Floating Point Average Value (Volts)
Average
Identifier
AVE+0.000000E+00<term+EOI>
Figure 10. U4 Word Format (Buffer Average)
Standard Deviation Identifier
Floating Point
Standard Deviation
Value (Volts)
STD+0.000000E+00<term+EOI>
Figure 11. U5 Word Format (Buffer Standard
Deviation)
29
Floating Point
Reading Relative
Reading
(Measurement)
Relative Identifier
Value (Volts)
MRL+0.000000E+00<term+EOI>
Figure 12. U6 Word Format (Reading Relative
Value)
Output
Relative
Identifier
Floating Point
Output Relative
Value (Volts)
ORL+0.000000E+00<term+EOI>
Figure 13. U7 Word Format (Analog Output
Identifier
Output
Gain
Relative Value)
Floating Point
Output Gain
Value (Volts)
OGN+1.000000E+00<term+EOI>
Figure 14. U8 Word Format (Analog Output Gain)
30
Trigger
Interval
Identifier
Trigger
Interval
Value (msec)
INT000250<term+EOI>
Figure 15. U9 Word Format (Trigger Interval)
Trigger
Delay
Identifier
Trigger
Delay
Value (msec)
DLY000000<term+EOI>
Figure 16. U10 Word Format (Trigger Delay)
31
Calibration Constants
Identifier 3mV PFS 3mV NFS 3mV Zero
CAL+4.000000E-01 , +4.000000E-01 , +5.000000E-08,
30mV PFS 30mV NFS 30mV Zero
+4.000000E-01 , +4.000000E-01 , +4.000000E-08,
300mV PFS 300mV NFS 300mV Zero
+4.000000E-01 , +4.000000E-01 , +5.000000E-08,
3V PFS 3V NFS 3V Zero
+4.000000E-01 , +4.000000E+01 , +4.000000E+07,
30V PFS 30V NFS 30V Zero
+4.000000E-01 , +4.000000E+01 , + .000000E+0 ,
Divider Source PFS Source Zero
+1.000000E-00 , +0.000000E+00 , + .000000E+00 <term+EOI>
Notes: 1. String shown broken down for clarity. Actual
string is sent as continuous string.
2. PFS = positive full scale; NFS = negative full scale.
3. Actual calibration values are determined at calibration time and will vary from those shown.
Figure 17. U11 Word Format (Calibration
Constants)
32
Calibration
Lock
Identifier
LCK 1 <term+EOI>
1 = Calibration locked 0 = Calibration unlocked
Figure 18. U12 Word Format (Calibration Lock Status)
33
B (Resolution)
0 = 5 1/2 1 = 6 1/2 2 = 3 1/2 3 = 4 1/2
R (Range)
0 = Auto 1 = 3mV 2 = 30mV 3 = 300mV 4 = 3V 5 = 30V
Z (Reading Relative)
0 = Disabled 1 = Enabled using reading 2 = Enabled using value 3 = Enabled using prior value
K (EOI and Hold-off)
0 = EOI hold-off enabled 1 = EOI disabled, hold-off enabled 2 = EOI enabled, hold-off disabled 3 = Both EOI and hold-off off disabled
Y (Terminator)
: <CR LF> or <LF> = <LF CR> or CR
5 1 0 1 0 0 6 0 : <Term + EOI>
P (Digital Filter)
0 = Disabled 1 = Fast 2 = Medium 3 = Slow
Figure 19. U13 Word Format (Model 181-Like
D (Damping)
0 = Off 1 = On
M (SRQ)
0 = Disabled 1 = Enabled
Machine Status)
T (Trigger)
0 = Multiple on talk 1 = One-shot on talk 2 = Multiple on GET 3 = One-shot on GET 4 = Multiple on X 5 = One-shot on X 6 = Multiple on external 7 = One-shot on external 8 = Multiple on manual 9 = One-shot on manual A = All triggers disabled
34
Message Identifier
String
Stored in EPROM
M S G <string> <term+EOI>
Figure 20. U14 Word Format (ASCII Message String)
Single Quote
Delimiters
35
36
Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of
Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies.
Keithley Instruments, Inc.
28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168
1-888-KEITHLEY (534-8453) www.keithley.com
© Copyright 2000 Keithley Instruments, Inc. Printed in the U.S.A.
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