Keithley 263 User manual

Model263 Calibrator/Source
Quick ReferenceGuide

INTRODUCTION
This quick reference guide contalne descriptions of parlous
features and Information concerning the operation of the
Model 283. Also included are programming examples using
VBrlous COntr011wa.
Q1997, Keithley Instruments. Inc.
Instruments Division
Cleveland. Ohio, U.S.A.
Document Number: 283-903-01 Rev. A

TABLE OF CONTENTS
SAFETY PRECAUTlONS 3
FRONT PANEL OPERAflON 4 : j
CONNECTORS IRear Panell.. 9
PROGRAMMING OUTPUT VALUES 10 i i
SOURCING METHODS 11 ; ~
GUARD 13 ‘~I
FRONT PANEL PROGRAMS. 16 i
IEEE-488 PROGRAMMING.. 17
PROGRAMS 23
IBM PC or AT ICEC PC < > 488 Interface1 24
IBM PC or AT ,National GPIS PC Interface,. 26
APPLE II 28
HP85................................ 30
HPSERlES300and.9816 ,,,,,,,,,,,,,.,,, 32 ; j I
HP9925A............................. 34 :
DECLSIll ,...,,.,,,,,,,,,,,o,,,,.,,, 36 i ,! _

SAFETY PRECAUTIONS
1. Before operation, ground the instrument through a prop-
erly earth grounded power receptacle.
2. Before sevlcing, disconnect the instrument from the
power line and all other equipment, and consult the Model
263 InstructIon Manual.
3. Do not touch any terminals while the Instrument Is oon-
nectsd to any other test equipment.
3

I
FRONT PANEL OPERATION
POWER-Controls AC line power to the instrument. i ;
I
~I
1~~>
,
SHIFT-Several controls have secondary functions that are
selected by first pressing SHIFT and then pressing the ap- 1 :
propdate button.
: I

FUNCTION GROUP
FUNCTION
OHM9
o=
VOLTS EX
OmH
AMPS
f=-l
OYAV/Rm
OB-'
OHMS-Pressing the OHMS button configures the Model
263 as a resistance source. The value of the reslstanoe will
be displayed.
VOLTS-Pressing the VOLTS button conflgures the Model
263 88 a voltage 80”~~ The voltage VBIUBwill be displsyed.
Pressing SHIFT VOLTS configures the Model 263 to output
an external wurce applied to the EXT INPUT and COMMON
terminals on the rear panel. The EXT indicator turns on and
the message “USE, V” 18displayed.

AMPS-Pressing the AMPS button configures the Model :
263 as an active current source. The programmed current
value will be dlsplayed.
Pressing SHIFT AMPS turns on the V/R light indicating that
the Model 263 is configured as a passive current aouroe. I
COUL-Pressing the COUL button conflgures the Model
263 8s an active charge 8ouroe. The currently selected :
range and programmed charge value will be displayed.
Pressing SHIFT COUL turns on the VIR light indicating that ’ ’
the Model 263 is configured as a passive charge source.
CONTROLGROUP
6

RANGE-These two buttons are used to swleot the range
of the selected function. RANGE A upranges the Instru-
ment and RANGE V downranges.
CURSOR-These two buttons are used to position the our-
sot when using the Adjust Method to modify an output
valuw. CURSOR C moves the cursor from left to right and
conversely, CURSOR 4 moves the cursor from right to left.
Not functional In OHMS.
Pressing SHIFT ON/OFF the first time displays the flashing
cursor continually. Pressing It again disables the cursor. Not
functional in OHMS.
ADJUST-These two buttons aro used to modify the display
reading using the Adjust Method. ADJUST A increments
the reading at the seleotnd dlglt and ADJUST T decrements
the reading. Not funotional in OHMS.
KEYPAD/ENTER-Pressing this button enables the keypad
allowing an output value to be keyed in using the number
10through 91buttons and the + button IKeypad Method).
Pressing this button *gain enters the resdlng and disables
the keypad. Not functional in OHMS.
SHIFT CANCEL-Pressing this button after keying in B
reading (Keypad Method) canoels that reading and disables
the keypad.
+/- Toggles the displayed reading (except OHMS1 bet-
wsen posltlve (t) and negative l-l polarity. Not functional
in OHMS.
ZERO-Toggles the display between zero and the previously
displayed reading.
SHIFT GUARD-Toggles the output configuration between
guarded and unguarded.
7

MENU-Used to Sslsot front panel program& Program
parameters are modified by the ADJUST buttons. Pressing
MENU after modifying a program parsmeter enters the new
parameter and returns the instrument to normal operation.
OPERATE-Toggles the instrument between the standby and
operate conditions.
8

CONNECTORS (Rear Panel)
OUTPUT-Output high is available at this triax connector
ion the center conductor). Output low is available here Ion
the inner shield) or at the COMMON terminal depending
an the configuration of the output kmguarded or guarded).
EXT INPUT-This banana plug is used to connect an exter-
nal input (2OOV. lOOmA peak1 to the Model 2133. The ex-
ternal Input is then available at ths output of the Model 283
when VOLTS EXT is selected.
COMMON-Output low Is always avsllable at this termlnsl
regardless of the oonflguration of the output.
PREAMP OUT-This terminal along wlth COMMON can be
used to monitor the voltage drop across a load when the
instrument is sourcing current or charge. This termlnsl can
also be used as an external guard drive when sourcing
AMPS or COUL. PREAMP OUT is inoperative in AMPS V/R.
COUL V/R, VOLTS and OHMS.
IEEE CONNECTOR-Used to connect the instrument to the
IEEE-488 bus. IEEE interface functions are marked above
the connector.
AC RECEPTACLE-Power is applied through the supplied
power cord to the 3-terminal AC receptacle.
9

PROGRAMMING OUTPUT
VALUES _
For all functions, except OHMS, the following two data entry
methods can be used to program the instrument for 8” out- : ;
put value. In general, use the Adjust Method to modify B
value and the Kevpad Method to enter a completelv new
v.aIuB. ,~ I I
Adjust Method I
1.Position Cursor. Using CURSOR 4 and CURSOR C, place
the cursor on the digit to be changed. To continuallv :
display the cursor location, press SHIFT ON/OFF.
2.Adjust Display Reading. Use thB ADJUST A and ADJUST ~
v to increment or decrement the reading. Polarity of the
reading is toggled by the +/- button.
Keypad Method
1.Enable Keypad. Enable the keypad by pressing KEYPAD/
ENTER. Keypad LED turns on.
2.Key In Reading. Key in the reading by pressing the BP- ‘-
propriate number button (0 through 91 at each oursor
location. Polarity is toggled by the +/- button.
Note: If it is desired to cancel the keyed in reading and
return to the previously programmed value, press SHIFT :
CANCEL. The keypad will disable.
3.Enter Reading. Again press KEYPAD/ENTER to enter the :
displayed reading and disable the keeypsd. Keypad LED
turns off.
10

SOURCING METHODS
Figures 1 through 6 show the basic methods that the Model
263 ums to source resistance, voltage, current and charge.
MODEL 263
_ _ _ _ _ _ - - _ _ _ - - - - - 1
Flgure 1. Ohms Source
Flgum 2. Volts Source
11

Flgum 3. External Source
MODEL 263
r___-_____-_-_
l-=--t--
L- _-__ ---------,
Flgure 4. AMPS V/A and COUL V/A
Flgum 5. Amps and Coul Source
12
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,

GUARD
In the normal unguarded output con‘iguratlan, o”tp”t high
is connected to the center conductor of the triax OUTPUT
connector and outp,” low is connected to the Inner shield
Isee Figure 8). When the o”tput of the Mods1 203 18plac-
ed I” the guarded conflguration, by pressing SHIFT GUARD,
output low Is disconnected from the inner shield of the OUT.
PUT connector ellowlng a guard drive to be connected to
it. In AMPS and COUL the guard drive is provided
by the Model 283. On the other functions (AMPS V/R, COUL
V/R, OHMS and VOLTS), the inner shield of the triax OUT-
PUT connector Is floating unles8 a guard drive is supplied
by the user. Figures 7 through 10 show the guarded out-
put configurations for all functions.
Guarding 18recommended for r~slstancw8 2 100Mg. Gusrd-
ing is not necessary when the Model 263 is sourcing cur-
rent to a feedback picoammeter since this oircult is already
guarded. The low Input voltage burden of a feedback pico-
mmeter results with virtually the some voltage 0” output
high and low. Guarding Is recommended when sourcing cur-
rent or charge to a high impedance load. Guarding Is un-
“~CBSSB,~ when sourcing voltage.
0ulPU-l
HI
LO
3 COMMON
Flgure 6. Normal (Unguarded) Output ConfIguration
13

Flgure 7. Guarded Ohms Output Conflgurstlon
OUTPUT
:----_HL-
r----
$t_l
It--
Flgum 8. Guarded AMPS WA and guarded COUL V/R L ~~’
output Co”llguratlo”

Flgum S. Gusrdsd Amps and guarded Coul Output
Co”flguratlon
HI
OUTPUT
+ V.
c I.0
Figure 10. Guarded VOLTS OUtput Conflgumtlon
16

FRONT PANEL PROGRAMS
The available front panel programs are summarized in
Table 1. Perform the following steps to use B program:
1. Display the desired program using the MENU button.
2. Use the ADJUST A or ADJUST 7 button to change the
program pammeter.
3. To enter the new program paramter, press the MENU but-
ton again. The instrument will return to normal operation.
Note: The IEEE address fProgram IEEE1and the display
mode IProgram dlSPl are stored in memory. Thus, the :~~i
instrument will power-up to the programmed parameters.
Temperature compensation status is not stored and will I
always power up enabled Ill.
Table 1. Front Panel Programs
Check or change IEEE-488 bus address 10
Selects alternate display mode; engineer-
ing units lpi or scientific notation l-61.
Check or change temperature compensa-

IEEE-488 PROGRAMMING
DEVICE-DEPENDENT COMMANDS
EKeCUte
X Execute other device-dependent
commands
17

Ohms Amps vcns CO”, Ladder
Auto on Auto on A”,0 0” A”,0 0” fluto cl”
1k” 2 pA 2OLh” 2opc IML
to k” 20 PA 2 v 2oopc m”ll.
lock” 200 PA 20 ” 2°C ,CCML
tfm 2llA 20 ” 20°C 1GL
lcJM” 20llA 20 v 200°C WGL
lOOM” 200 nA 20 v 2pc 1OOGL
1G” 2pA 20 ” 2O#C lOOGL
IOG” 2OpA 20 ” 20qk IOOGL
lOOGO 200 pA 20 V 200,X 1OOGL
1000” 2mA 20 ” ZOO& IOOGL
IOOG” 20mA 20 V ZOOtiC ,OOGL
A”*0 Off A”,0 Off Auto Off Auto Off A”to Off
zero
:7 Zero Off
Zero on
Temperature Compensation
co Temperature compensation off
c, Tempsrsture ccmp~n~aticn on
Quml
wo Guard Off
Wl Guard On ~
I
( I
18 :, j ~