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Model 486
PICOAMMETER
Model 487
PlCOAMMETER/SOURCE
QUICK REFERENCE GUIDE
INTRODUCTION
This quick reference guide contains descriptions of vari-
ous features and information concerning the operation of
the Model 4861487.
~21990, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Document Number: 486-903-01 Rev. A
1
Asyst ts a registered trademarkof Asyst Software technologies.
Hewtett-Packard Is a registered trademark of Hewlett-Packard
Company.
IBM and AT are registered trademarks and PC/XT is a trademark
of International Business Machines, I~C.
PC&488 is a registered trademark of Capital Equipment Cow
ration.
2
TABLE OF CONTENTS
SAFETY WARNINGS ......................... 5
ERROR MESSAGES ......................... 7
CURRENT MEASUREMENTS .................. 8
VOLTAGE SOURCE (Model 487) .............. 14
V/l OHMS MEASUREMENTS (Model 487) ....... 19
MENU .................................... 21
FRONT PANEL TRIGGERING ................. 22
EXTERNAL TRIGGERING .................... 24
DATA STORE OPERATION .................. 26
ANALOG OUTPUT .......................... 27
TALK-ONLY ............................... 28
IEEE-488 PROGRAMMING .................. .29
Device-dependent Commands ................. 29
Display Intensity ........................ 29
Reading Source ........................ 29
Zero Check and Correct .................. 29
Display ............................. ..3 0
V/lOhms ........................... ..3 0
Data Format ........................... 39
Hit Control ............................ 31
Self-Test .............................. 31
EOI and Bus Hold-off ................... .31
Default Conditions or Calibration ........... 32
SRQ ............................... ..3 2
Data Store ............................ 32
Operate .............................. 33
Filters ................................ 33
Interval ............................... 33
Range................................3 3
Integration ............................ 34
3
Trigger ...............................
Status.. .............................. i: l
Voltage Source (487) .................... 35
Delay ................................
Execute ............................ ..3 35
5 a
Terminator .......................... ..3 5
Relative .............................. 36
Data Formats .............................. 36 a
SRQ Mask and Serial Poll Byte ................ 40
StatusWords ............................ ..4 1
a
4
SAFETY WARNINGS
The following precautions should be observed before us-
ing Model 488/487. Refer to main manual for detailed
safety information and complete operating instructions.
The Model 48W487 is intended for use by qualified per-
sonnel who recognize shock hazards and are familiar
with the safety precautions required to avoid possible in-
jury. Read over the instruction manual carefully before
using the instrument.
Before operating the instrument, make sure the line cord
is connected to a properly grounded power receptacle.
Exercise extreme caution when a shock hazard is pre-
sent. Lethal voltages may be present on the test fixture or
the Model 487 output jacks. The American National Stan-
dards Institute (ANSI) states that a shock hazard exists
when voltage levels greater than 30V RMS or 42.4V peak
are present. A good safety practice is to expect that
hazardous voltage is present in any unknown circuit
before measuring.
Inspect the connecting cables, test leads, and jumpers
for possible wear, cracks, or breaks before each use.
5
For maximum safety, do not touch the Model 487 con-
nections, test fixture, test cables or connections to any
other instruments while power is applied to the circuit un-
der test. Turn off all power and discharge all capacitors
before connecting or disconnecting cables or jumpers.
Also, keep the test fixture lid closed while power is ap-
plied to the device under test. Safe operation requires the
use of the lid interlock.
Do not touch any object which could provide a current
path to the common side of the circuit under test or power
line (earth) ground.
Do not exceed the maximum signal levels of the instru-
ment, as shown on the rear panel and as defined in the
specifications and operation section of the instruction
manual.
Connect the chassis of the test fixture to safety earth
ground using #I 8 AWG or larger wire.
Instrumentation and accessories should not be con-
nected to humans.
Maintenance should only be performed by qualified serv-
ice personnel. Before performing any maintenance, dis-
connect the line cord and all test cables from the instru-
ment.
6
ERROR MESSAGES
Table 1. Error Messages
Message Description
NO DEFLTS Checksum error in default condi-
tion during power-up.
UNCAL Checksum error in calibration
during power-up
ROM ERROR Failed ROM self-test.
RAM ERROR Failed RAM self-test.
TRG OVERUN Trigger overrun; instrument trig-
gered while still processing a pre-
vious trigger.
CAL VALUE Calibration value conflicts with
the currently selected range.
CAL ERROR Calibration value not within allow-
able limits.
CAL LOCK Sent calibration command with
calibration switch (CAL LOCK)
disabled.
CAL ZCHK Cannot calibrate picoammeter
with zero check enabled.
INTERLOCK Tried to put V-Source of Model
487 in operate while an enabled
safety interlock switch is open.
CURRENT MEASUREMENTS
Current Ranges
SHIFT v RANGE A
q El
AUTO
0
RANGE
The available current ranges of the Model 4861487 are
listed in Table 2.
Table 2. Current Ranges
.
2nA 2.19999nA 35OVdc
20nA 21.9999nA 35OVdc
200nA 219.999nA 35OVdc
2c1A 2.19999pA 35OVdc
20/.iA 21.9999pA 5OVdc
2oopA 219.999uA 50Vdc
2mA 2.19999inA 50Vdc
`Higher voltages require current to be limited to 3mA.
Autorange is enabled by pressing SHIFTand then AUTO
RANGE in that order.
CAUTION
To avoid possible damage to the instru-
ment, do not apply more than 5OVdc to
the input when autorange is enabled
(unless an external series resistor to
limit current to 3mA is used).
Zero Check and Correct
ZERO
SHIFT CHECK
q El CORRECT
When zero check is enabled, the input amplifier is inter-
nally disconnected from the input connector of the instru-
ment. A 1OOkGresistor shunts the input connector, and
the instrument displays the offset of the selected range.
When zero correction is performed, the offset is meas-
ured and algebraically subtracted from every subsequent
reading (including zero checked readings).
Zero check is enabled by pressing ZERO CHECK.
Pressing ZERO CHECK a second time disables the fea-
ture.
9
When zero correction is performed, only the present
range is zero corrected. Before making measurements, it
is recommended that each current range be zero cor-
rected.
To perform zero correction:
1. Enable zero check.
2. To perform zero correction, press SHIFT and then
CORRECT in that order.
Filters
SHIFT
cl
Filtering is used to stabilize noisy measurements. The
Model 486/487 has two available filters; a digital filter and
an analog filter. The digital filter bases the reading on the
weighted average of a number of measurement conver-
sions. The analog filter is a simple RC filter whose time
constant varies with the selected range.
When the filter is enabled, the selected filter(s) (digital fil-
ter, analog filter or both) will be used.
10
To check or change the filter selection:
Press SHIFT and then FILTER SELECT in that or-
der. One of the following messages will be dis-
played to indicate the currently selected filter(s):
FILTER DIGITAL (Digital filter selected)
FILTER ANALOG (Analog filter selected)
FILTER DIG+AN (Both digital and analog
filters selected)
To select a different filter, use the rotary knob or the
4 and b keys to display the desired filter selection.
Enter the displayed filter selection by pressing
SHIFT and then FILTER SELECT.
Rel
0
REL
q
The rel (relative) feature serves as a means of baseline
suppression by allowing a stored offset value to be sub-
tracted from subsequent readings. When rel is enabled,
the instrument takes the currently displayed reading as a
baseline value. All subsequent readings represent the
difference between the applied signal level and the
stored baseline.
11
A baseline can be established for both current and VII
ohm measurements and is "remembered" by both func-
tions.
Rel is enabled by pressing the REL key. Pressing REL a
second time disables the feature.
Making Current Measurements
To make current measurements:
1. Select a current range that is appropriate for the ex-
pected measurement or enable autorange (press
SHIFT and then AUTO RANGE).
2. Enable zero check and, if the display is not zeroed,
perform zero correction by pressing SHIFT and
then CORRECT.
3. Connect the current to be measured to the input of
the Model 486/487 (see Figures 1 and 2).
4. Disable zero check and read the measured current
on the display of the Model 486/487.
12
Input Connector
Max Overload
2nA - 2pA Range; 35OVdc
2OpA - 2mA Range; 50 Vdc
Chassis Gmund
Fiaure 1. Triax InDut Connector (3-Lua)
Model486
Figure 2. Picoammeter Connections
VOLTAGE SOURCE
(Model 487)
CAUTION
The voltage source may float. However,
neither V-Source terminal may ever be
more than 500V above chassis.
V-SOURCE OUTPUT
500V MAX TO ,& OR.+
I HI LO 1
5oov
MAX
Figure 3. Model 487 V-Source Output Terminals
Table 3. Model 487 V-Source
14
Test Fixture and Interlock
The voltage source of the Model 487 is designed to be
used with a test fixture that incorporates a safety interlock
switch, such as the Keithley Models 8002A High Resis-
tance Test Fixture. By using the interlock feature, the
Model 487 cannot source voltage when the lid of the test
fixture is open or ajar.
Adjusting V-Source Level
The rotary knob and the4 and, keys are used to adjust
the V-Source level and select range.
WARNING
With the instrument in operate (OPER-
ATE indicator on), the displayed voltage
level (possibly hazardous) will be ap
plied to the output terminals of the V-
Source. The V-Source should be kept in
standby until ready to safely source
voltage to a load.
15
Preset
PRESET
Preset allows the V-Source to be toggled between two
preset values.
To preset a V-Source level:
1. Enable preset by pressing PRESET. Indicator wljl
turn on.
2. Adjust the V-Source to the desired range and level.
3. Disable preset by again pressing PRESET.
4. Whenever preset is enabled, V-Source will adjust
to the value and range set in step 2.
I-Limit
The V-Source has current limit (l-limit) capabilities to pro-
tect the instrument and external current sensitive circuitry
from possible damage. The V-Source can be set for an
l-limit of 25pA or 2.5mA.
When l-limit occurs, the OPERATE indicator will flash.
16
To set l-limit:
1. Keep pressing and releasing MENU until the cur-
rently selected i-limit is displayed:
ILIMIT 251rA
or
ILIMIT 2.5mA
2. Use the rotary knob to display the desired l-limit
value.
3. to enter the displayed l-limit, press MENU.
Operate
5oov 2mA
MAX
OPERATE
0
III
FLASHES
IN I LIMIT
The OPERATE key toggles the output between standby
and operate. In standby, the V-Source is removed from
the rear panel output terminals. In operate, V-Source is
applied to the output terminals.
17
V-Source Operation
1. While in standby, connect the V-Source as shown
in Figure 4.
2. Use the rotary knob, and the 4 and b keys to set
the desired voltage range and level.
3. Select the appropriate l-limit (25pA or 2.5mA).
4. Press Operate.
5. To disable the V-Source, again press OPERATE.
--
HI r 7 Safety
-%---I 1 Shield
3anana r;
`lug Cables
Model 487
Figure 4. Basic V-Source Connections
18
V/I OHMS MEASUREMENTS
(Model 487)
By using the V-Source in conjunction with its picoamme-
ter, the Model 487 can make resistance measurements
as high as 5.05 x 10i6fI. With V/I ohms selected, the re-
sistance is automatically calculated from the applied volt-
age and measured current (R=V/I) and displayed (in
ohms) on the Model 487.
The V/I ohms function is enabled by pressing SHIFT and
then OHMS.
To make VA ohms measurements:
1. With zero check enabled and the V-Source in
standby, connect the circuit shown in Figure 5.
2. Select a current range that gives the nearest full
scale reading or autorange, and perform zero cor-
rection by pressing SHIFT and then CORRECT.
3. Set the V-Source to OV on Ihe range that will be
used and press OPERATE to enable the source
output.
4. Press REL to cancel offset current.
5. Set the V-Source to the desired voltage level.
6. Disable zero check. The current measurement will
be displayed.
7. Enable V/I ohms by pressing SHIFT and then
OHMS.
8. To measure from a baseline resistance, enable ref
while in V/I ohms.
19
Figure 5. V/I Ohms Connections (Source V
Measure I)
20
MENU
The menu items are listed in Table 4. In general, each
press of the MENU key displays a menu item in the order
shown in the table. The available selections of the dis-
played menu items are selected and displayed with the
rotary knob or the4 and, keys. The displayed option of
the displayed menu item is selected by again pressing
MENU. To exit the menu, press SHIFT and then EXIT.
Table 4. MENU items
Menu Item 1 Description
DATA STORE Arm data store and set buffer size
DATA RECL Recall data stored in buffer
ILIMIT Set current limit; 25t~A or 2.5mA
(Model 487 only)
INTEGRATE Set integration period; fast or line
cycle (50 or 60Hz)
IEEE-488 Set IEEE-488 address O-30 or se-
lect Talk-only
DEFAULTS Save steps as power-up defaults,
return to previously saved defaults,
or return to factory defaults
SELFTEST Test display and memory elements
DEBUG Troubleshooting mode
CALIBRATE Calibrate current range
CAL V SRC Calibrate V-Source (Model 487
only)
21
FRONT PANEL TRIGGERING
Trigger Setups
In general, trigger setup (mode, internal, delay and
..
I.
sources) Is penormea ay:
1. Press SETUP to display the setup.
2. Use the rotary knob to display the desired option of
the setup.
3. Press SHIFT and then SETUP to select the dis-
played setup.
Trigger Mode
In the one-shot mode, a separate trigger is required to in-
itiate each reading. For the multiple mode, however, only
a single trigger is required.
22
Trigger Interval
Determines the time period between individual readings
when the instrument is in the multiple trigger mode.
The trigger interval can be set from 1Omsec to
999.999sec.
Trigger Delay
Time from the trigger point until the unit takes a reading.
In the multiple trigger mode, the delay period affects only
the first conversion; however in the one-shot trigger
mode, the delay period affects every conversion.
The Model 4861487can be programmed for adelay inter-
val from Osec to 999.999sec in 1msec increments.
Trigger Sources
Available trigger source selections:
TRIG SRC EXTERNAL
TRIG SRC OPERATE
TRIG SRC BUS X
TRIG SRC GET
TRIG SRC TALK
23
EXTERNAL TRIGGERING
EXTERNAL METER
TRIGGER COMPLETE
INPUT OUTPUT
Figure 6. Trigger Connectors
Triggers on
Figure 7. External Trigger Pulse Specifications
24
Figure 8. Meter Complete Specifications
25
DATA STORE OPERATION
Storing Data
1. Set the trigger mode, interval and delay.
2. Arm data store and set buffer size as follows:
A. Press MENU until the data store is selected,
and use the rotary knob to display the follow-
ing:
DATA STORE YES
B. Press MENU to display buffer size.
C. Use the rotary knob or thedand, keys to dis-
play the desired buffer size value.
D. Press MENU.
3. Press TRIGGER to initiate storage.
Recalling Data
1. Press MENU until data recall is selected, and use
the rotary knob to display the following message:
DATA RECL YES
2. Press MENU. The reading stored in the first mem-
ory location will be displayed.
3. For sequential access, use the rotary knob.
4. To access a reading at a particular memory loca-
tion, adjust the display to the desired location value.
5. To exit data recall, press SHIFT and then EXIT.
26
ANALOG OUTPUT
The Model 4861487 has a non-inverting analog output.
For a 200,000 count input, the analog output will be 2V.
27
TALK-ONLY
In talk-only, the Model 486/487 will talk continuously on
the IEEE-488 bus and output readings to a listen-only de-
vice whenever a measurement conversion occurs.
To place the Model 4861487 in talk-only:
1. Press and release MENU until the present
IEEE-488 selection is displayed.
2. Use the rotary knob to display talk-only as follows:
IEEE-488 TALK ONLY
3. Press MENU. The TALK indicator will turn on.
4. Exit the menu by pressing SHIFT and then EXIT.
28
IEEE-488 PROGRAMMING
Device-dependent Commands
Ml
Reading Source
Readings from A/D
Single reading Fromdata store
All readings from data store
Maximum reading from data store
Minimum reading from data store
Zero Check and Correct
Disable zero check
Enable zero check
Enable zero check and perform zero cor-
rection
29
Display
Da Display up to 18 character (a) message
D Cancel display mode
V/I Ohms
Disable V/I ohms
Enable V/I ohms
1 Data Format
ASCII rdgs with prefix
ASCII rdgs without prefix
ASCII rdgs and buffer locations with prefix
ASCII rdgs and buffer locations without
prefix
G4 Binary rdgs: IEEE Std 754 single-preci-
sion, bytes reversed for Intel CPUs
G5 Binary rdgs: IEEE Std 754 single-preci-
sion, bvtes in normal order for Motorola
CPUS -
~G8 Binary rdgs: counts and exponent, bytes
reversed for Intel CPUs
G7 Binary rdgs: counts and exponent, bytes
in normal order for Motorola CPUs
30
Hit Control
Hit DISPLAY INTENSITY key
L-L Hit LOCAL key
Hit SHIFT key
E Hit MENU key
Hit ZERO CHECK key
K Hit FILTER key
H7 Hit RANGEI key
H8 Hit REL key
HQ Hit RANGEAkey
H10 Hit SETUP key
Hi1 Hit TRIGGER key
H12 Hit OPERATE key (487)
H13 !$FtESET key (487)
Hi4 '
HI5 Hit
H16 Hit Rotary Knob counterclockwise
Hi7 Hit Rotary Knob clockwise
Self-Test
Perform ROM/RAM self-test
Perform disalav and ROM/RAM self-test
i EOI and Bus Hold-off I
1; EnableEOIandbushold-offonX 1
Disable EOI enable bus hold-off on X
Enable EOI, disable bus hold-off on X
Disable both EOI and bus hold-off on X
31
Default Conditions or Calibration
LO Return to factory default conditions and
save (L-f)
Save present states as default conditions
ki Return to saved default conditions
L3,V Calibrate present measurement range
using "v"; v=-2mA to +2mA
L4 Calibrate zero on present voltage source
range (Model 487 only)
L5 Calibrate full scale on present voltage
source range (Model 487 only)
L6 Prepare to calibrate present voltage
source range (Model 487 only)
SRQ
Disable SRQ
K Reading overflow
M2 Data store full
Data store half full
Ii: Reading done
Ml6 Ready
M32 Error
Ml28 Voltage Source Error (Model 487 only)
Arm data store; set buffer size `W' where
32
Place voltage source in operate
g Disable digital and analog filters
Enable digital filter; disable analog filter
Disable digital filter; enable analog filter
Enable digital and analog flters I
Range
Enable autorange
Select 2nA range
Select 20nA range
Select 200nA range
Select 2juI range
Select 2OpA range
Select 200pA range
Select 2mA range
No range
No range
Disable autoranoe
33
I lntearation I
Fast integration; 1.6msec at 4-112 digit
or 2Omsec (5OHz) at 5-l/2 digit resolution
Trigger
TO Multiple on Talk
One-shot on Talk
T: Multiple on GET
T3 One-shot on GET
Multiple on X
z One-shot on X
Multiple on External Trigger
G One-shot on External Trigger
T8 Multiple on Operate (487)
TQ One-shot on Operate (487)
Status
Send machine status word
Send error status word
Send model number and firmware revi-
sion
Send calibration value
Send interval
Send delay
Send relative value for current
Send relative value for V/I ohms
Send voltage source value (487)
Send voltage source error status word
(487)
34
I Voltaae Source 14871 I
Vn,r,l Specify voltage source level "n" in volts,
range "r" and limit "I"
n: -505 to ~505
r: 0 = 50V range; 1 = 500V range
I: 0 = 2OuA limit: 1 = 2mA limit
i Delav
Wn Delay trigger "n"
Execute
X Execute other device-dependent com-
mands
Terminator
CR LF
?Y LF CR
CR
E LF
Y4 Nnnn
35
Relative
Disable relative
E Enable relative using present reading as
baseline
z2,V Enable relative using `V as baseline;
v = -2mA to +2mA for current = On to
50.5PR for V/I ohms
23 Enable relative using the baseline previ-
ously defined
Data Formats
Finure 9. ASCII Data Format (G2: Prefix and Suffix)
36
G5 Format (Normal order ; MotMok CPU)
Header * Reading *'
A-
68yies 1 Bylei Byte2 Byle3 Byte4 a--
l II I
I
sign Exponent Manlksa
(1 Bii (SB%s) (23 Bits)
(single preciston, IEEE-75-4)
G4 Format (Reverse mier : lnlel CPU) : Fleading bytes sem in reverse order:
i-leader. Byte 4. Byte 3, Byte 2. Byte 1
`Headers Rr IJm G4 and G5 fcxmak are shown in FQ. 4.4
** When remllinp data from the huller. one header
k l&wed by one or more readings. dependinp
on btmer sire.
Figure 10. G4 and G5 Binary Data Formats
(IEEE Std. 754)
37
I
I II r
SEytesILSBI 1 IMSB)LSB] 1 I MSB ---
Co:nhErpdnent
(16 bitsignecij (16 bittiQnw$
6wslMSBI ( ILSBIMSBI 1 1 LSB -**
VExpdnarn
' Headers for the G6. and G7 formats are shown in Fig. 4-4
`*When recalling data from the buffer, one header
is followed by one or more readings, dependiw
on buffer&e.
NME : True k?adinQ Counts X 10 -
=
Figure 11. G6 and G7 Binary Data Formats
(Counts/Exponent)
38
G5 and 07 Header (6 bytes) :
Figure 12. Headers for Binary Formats
39
n
f
2
5
x
J 1 = VobJe SourGwEmr
t l=RQS:SRQbyMiB/487 1 = Data Stare Full
2.
EL t- we @w
1 = Data Store Half Full
g
1 = FwcmQ Done
*AhwysOforkbdel4SS
3
a
Status Words
UO Machine Status Word
Model 466: 466 AD BO Cl GOH** JO KOMOO0 NO00
P3 Rll Sl T6 YO 20 c*
Model 467: 467 A0 BO Cl FO GO H* JO KO MOO0
NO00 00 P3 RI1 Si T6 VO1 YO ZOOc*
`Calibratkm switch (CAL LOCK) position;
"Last pressed key
DISPLAY INTENSITY (A) DATA FORMAT(G)
D=Normal O=Rdgwith prefix (ASCII)
1-Dim 1=Rdg without prefix (ASCII)
z=off 2=Rdg and buffer location
with prefix (ASCII)
READING SOURCE (B) 3=Fidg and buffer location
O=AfD Reading wifhout prefix (ASCII)
1-One data store reading 4=Binaryrdg - IEEE Std 754
2=All data store reading single - $ecfslon, bytes
3=Max data store reading reversed for Intel CPUs
4=Min data store reading B-Binary Rdg - IEEE Sfd 754
singie - f?reclsion,bytes in
ZERO CHECK and normal order for Motorola
CORRECT (C) CPUS
O-Zero check disabled B=Binary Rdg -counts and
I-Zero check enabled exponent, bytes re-
versed for Intel CPUs
VII OHMS (F) 7=Binary Rdg -Counts and
0-W Ohms disabled exponent, bytes in normal
1-W Ohms enabled order for Motorola CPUs
Figure 14. UO Machine Status Word (Factory
Defaults Shown)
41
UO Machine Status Word (cont.)
ilT CONTROL (H) SRQ (M) (cant)
XkPOWER' 004=Data Store l/2 Full
li=DISPtAY INTENSITY' 008=Reading Done
12=LOCAL* 01G=Ready
)3=SHIf=T 032=Error
14=MENU* 128=Voltage Source Error
XI-ZERO CHECK*
16=FILTER' DATA STORE SIZE (N)
;$=;;rGEv * OOO-Wrap around
nnn=OOi to 512
&fANGE&
lo-SETUP* OPERATE (0)
1I-TRIGGER' O-V-Source in Standby
12=OPERATE' 1-V-Source in Operate
13=PRESET'
14-d' FILTERS (P)
15-b' O=Both Filters Disabled
16=Knob rotated CCW 1=Digital Filter Enabled,
17=Knob rotated CW Analog Filter Disabled
*Last pressed Z=Digital Filter Disabled
Analog Filter Enabled
SELF-TEST (J) 3=Both Filters Enabled
O=No errors
1-ROM error RANGE (RMN)
2&AM error m: 0 = Autorange Disabled
3=ROM and RAM error 1PAutorange Enabled
n: l -2nA range
EOI & BUS HOLD-OFF(K) 2- 20nA range
O=EOI and Hold-off 3=200nA range
I-No EOI and Hold-off 4=2pA range
2=EOI and no Hold-off 5=2OpA range
3=No EOI and no Hold-off 6=2OOuArange
7=2mA
SRQ(M)
OOO-Disabled INTEGRATION PERIOD(S)
OOI-Reading overflow O-Fast (4-1/2d)
002=Data Store Full 1=Line cycle (5-1i2d)
UO Machine Status Word (cont.)
TRIGGER (-I-) ;Ei$llFATOR (Y)
O=Multiple on Talk P
1POne-shot on Talk 1..LFCR
2=Multiple on GET 2&R
3=One-shot on GET 3=LF
4=Multiple on X 4-None
5=Oneshot on X
6=Multiple on External RELATIVE (Zm or Zmn)
Trigger m: O-Current Rel Disabled
7=Cne-shot on External l-current Rel Enabled
Trigger n: 0-W Ohms Rel Disabled
8=Multiple on Operate 1-V/I Ohms Rel Enabled
S=One-shot on Operate
CAL LOCK (c)
VOLTAGE SOURCE O&witch in disabled
(vmn) ([tied) position
m: 0 = 50V range a&witch in enable (locked)
1=5OOVrange position
n: O-25pA Limit
1=2.5mA Limit
43
I!
P
0
G
5 l=IDDC I= v-sourcs
m 1 I IDDCO 1 = v-source confm
2
s 11
4w487
2
rr
on on on on on on on on on on 011on 011
$
1 = No Remote
3 Cal Constants
ii I= E* PROM Defaults
`I= Tf&w Overrun
1 =cs.lL!a?ked 1 ~ZeroCh6!&
U2 through U8 Status Words
U2 Model Number and Firmware Revision
e.g.486A03
U3 Calibration Value
e.g. CV=+O.OOOOOE-O5A
U4 Trigger Interval
8.g. TI=001.236E+OOS
U5 Trigger Delay
e.g.TD=002.000E+OOS
U6 Relative Value (Current)
e.g. RV=+1.00000E-O3A
U7 Relative Value (V/I Ohms)
8.g.RV=+l.00000E+020HM
U8 Voltage Source Value
e.g. VS=+20.000E+OOV
Figure 16. U2 through U8 Status Words
45
U9 Voltage Source Error Status
467 O/I O/l
L L 1 = Interlock Open
1 = Current Limited
Figure 17. U9 Voltage Source Error Status Word
46
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
Printed in the U.S.A.