MODEL 485
AUTORANGING PICOAMMETER
QUICK REFERENCE GUIDE
INTRODUCTION
This reference and programming guide contains condensed specifications and information which describes the various features of the
Model 485. Each feature is described in three segments of information. The first segment describes the features. The second segment
gives an exact procedure on how to use the feature. The third segment gives application examples. These segments are brief, but the
information presented in this format is designed for a quick reference
of the Model 485 features and functions. Refer to the Model 485 Instruction Manual for complete information and essential safety information.
With the Model 4853 IEEE-488 interface installed, the Model 485 can
be controlled over the IEEE-488 bus. This booklet also contains information concerning Model 485 bus operation. Several example programs using some commonly used controllers are outlined to get the
Model 485/4853 “up and running”.
CONTENTS
CONDENSED SPECIFICATIONS ..........................
MODEL485 FEATURES
IEEE-488 PROGRAMMING..
PROGRAMS
IBM-PCorXTPersonalComputer..
(Keithley Model 8573 Interface)
APPLE II (Apple Interface)
HP-85 .................................................
HP-9825A.. ...........................................
HP-9816 ...............................................
HP-9845B.. ...........................................
TEK4052 ..............................................
DECLSIll..
PETlCBM2001
EH 7000 Computer
............................................
................................... 5
.............................
....................... 19
...............................
......................... ___.
........................................
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01984. Keithley Instruments, Inc.
Cleveland, Ohio, U.S.A.
Document Number: 485903-OlA
1
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21
22
23
24
25
26
29
30
13
18
2
CONDENSED SPECIFICATIONS
Accuracy (1 year)
18O -2WC
Range
2OilnA
INPUT VOLTAGE BURDEN: Less than 2OOhV.
RANGING: Manual or autoranging.
AUTORANGING TIME: 2COms per range.
SElTLING TIME AT DISPLAY: Less than lsec to within 1 cuunt after
CONVERSION PERIOD: 300ms.
TEMPERATURE COEFFICIENT: -z f0.1 x applicable accuracy
MAXIMUM COMMON MODE VOLTAGE: BOVrms, DC to 60Hz
ANALOG OUTPUT:
RELATIVE: Pushbutton allows zeroing of on range readings. Allows
DATA STORE and MINIMAX: 100 reading storage capacity. Records
LOG: Displays the logarithm (base 10) of the input current referenced to
Resolution
2nA
20 nA
W&h no limitiw resistance: 1OOOVdc with external lOOk series resistance.
ranging.
specification per T.
sine wave.
Output Voltage: +lV, = -10000 counts. (Except +lOOmV =
-1OoM) wunts on 2nA range.)
Output Resistance: 1OOOQ.
readings to be made with respect to baseline value. Front panel
annunciator indicates REL mode.
date at one of seven selectable rates from Brdgs/s to lrdg/hr and
manual triggering. Also detects and stores maximum and minimum
readings continuously while in the data store mode.
1A.
O.lpA
1 PA
10 pA
100 nA
1llA
10 nA
100 nA
*(%rdg + countsIt InputS
0.4 + 4 35OVdc
0.4 -t 1 35OVdc
0.2 + 1 35OVdc
0.15 + 1 35OVdc
0.1 +1
0.1 +1 5OVdc
0.1 +1 5OVdc
Maximum
Continuous
5OVdc
J
1
2
SAFETY SYMBOLS AND TERMS
I
The ayrnboj
the operating section in the Model 455 Instruction Manual.
The WARNING used in this guide explains dangers that could result in
personal injury or death.
on the instrument denotes that user should refer to
Q
SAFETY PRECAUTIONS
1. Before operation, ground the instrument through a properly earth
grounded power receptacle.
2. Before servicing, disconnect the instrument from the power line, all
other equipment and consult the Model 455 Instruction Manual.
3. Do not touch the input terminal while the instrument is turned on or
connacted to any other tast equipment. Common mode voltage may
be prasent.
3
DISPLAY ANNUNCIATORS
the fol\owing annunciators are displayA on the LCD Kiquid Crystal
Display1
AUTO-Indicates that the h+nfel485 is in the autorange mode.
REL--lnticates that the relative mode isselecttxl. The reading is r&t&
to some previous reading.
LOG-Log mode reading is directly in log (base 101.
SO-Indicates that the data store and minimax hold function is running. Displayed raadjng is present input.
RCL-Indicates that the displayed reading is recalled data.
BAT-Indicates that the battery requires recharghg (operates only if
the battery pack option Model 1758, is instaliedl.
ZERO CHECK-Indicates that the Model 485 is in the zero check
mode. Input impedance changes when in the zero check mode.
nA, & or mA-Nanoamps, microamps or milliamps selected. Read
measurement directly from the display. (e.g. 1.2345fll
RMT--(Remote) Model 485 is being controlled over the IEEE-488 bus
(Model 4853 installed).
CAL-Indicates that the Model 435 is in the calibration mode.
4
MODEL 485 FEATURES
RANGE t2nA to 2mAl
35ov
5ov
I z&v I
Description
The range buttons se&t the desired range of current measurement for
the Model 485. The range may’ be selected manually or automatically.
With manual range selection always use the range that allows the
greatest amount of resolution.
Operation
Manual
1. Determine signal to be measured.
2. Press appmpriate range button.
3. Apply signal.
Auto
1. Press the AUTO button.
2. Apply signal.
MAX
MAX
5ov 5ov
MAX MAX
5
ZERO CHECK
DesctiptIon
The ZERO CHECK button is used to correct interna ofFsets and also
protects the sensitive input circuitry from build up during overloads. In
the zero check mode or input overload, the input impedance of the
Modal 495 is changed as outlined in the following table.
INPUT RESISTANCE WITH ZERO CHECK ENABLED
Current Maximum Effective
Ranae lmut Resistance
2nA 1
1. Select range.
2. Depress ZEFtO CHECK. The ZERO CHECK button operatas on the
push-push principle. That is, pressing in the button locks the instrument in zero check, pressing the button again releases the zero check
mode.
Typical Use
Used in zeroing the 2nA range for precise measurements. Refer to
paragraph 2.72 in the Model 495 Instruction Manual.
1GMl
6
Impedance In
Zero Check/Overload
9MWX3IpF
REL (Relative Function)
REL
I
Description
The relative function serves as a means of baseline suppression allowing
a stored offset value to be subtracted from subsequent readings. When
the REL button is pressed, the instrument stores the baseline reading
with the next conversion. All subsequent readings represent the di-
ferences between the applied signal level and the stored baseline. The
stored baseline can be as small as the resolution of the instrument will
allow or as large as full range.
It is important to note that the REL function reduces the dynamic range
of measurements by that level (stored baseline). For example: assume
that the REL level is + Id and the Model 495 is manually set to the w
range. The maximum positive displayed reading, before overranging,
would be + 0.9999& This is because the A/D converter would be see-
ing + 1.9999fi to + 0.9999fi (2.999&A) as compared to the normal
-1.9999fi to + 1.9999d (3.9998fi). Actually, the dynamic range is
reduced by lfi or 10,000 counts. The effects on dynamic range can be
reduced by selecting e higher range or using autorange.
Operation
1. Select measurement mode and range. For example: normal measurement mode and the w range.
2. Press REL. The display reads zero.
3. The value that appeared on the display is now the stored offset.
Typical Use
1. Nulling out external source offset (e.g. calibrator offset).
2. Nulling out desired levels of offset (e.g. electrode dark current of
phototube).
7
LOG (Log Function)
Description
The log function gives the log (base 101 of the measured input current
referenced to 1A. Log can be used to make any current level the 0.0
(zero) point for log measurements. This can be done by selecting
autorange and log. Then measuring the desired current that is to be the
0.0 [zero) point. The logarithm is taken on the absolute value of the
measurement so that both positive and negative currents can be
displayed as e log. Press the REL button and the display wiil read 0.0
(zero). The measured current is now the 0.0 (zero) point for the log
function. The mathematical equation for the log function is shown as
follows:
Display = Log -
Operation (referenced to IA)
1. Select the auto range mode.
2 Apply the source.
3. Press the LOG button. The LOG annunciator on the display turns on.
4. Take the log reading from the display.
Typical Use
1. For use in measuring e wide range of current. Nuclear reactors have
various outputs of current that could be compressed (in readings only) by using the log function.
2 Measuring the current output of a phototube. REL can be used to
nu[l the dark current of the phototube.
Input
1 Amp
I I
DATA STORE (100 Point Data Store1
Description
The 100 point data store function serves to save up to 100 points of data
at the rate of one of six selectable rates from every reading (3 per
second) to one reading per hour. Also, manual data entry is available
(RN. This feature is useful in applications where data is required to be
logged over a period of time.
Operation
1. Connect desired measurement configuration to the Model 485.
2. Select rate of storage and begin data store:
A. Press and hold in the STO/CLR button.
6. The rates are scrolled on the display. Tithe rates are described
below).
C. Release the STWCLR button when the desired rate is displayed.
D. The ST0 annunciator turns on indicating that the data is being
stored at the selected rate.
Typical Use
1. Saving data points of current drift of a low leakage device such as e
FEr.
2. Monitoring and saving current levels that fluctuate over a period of
time.
r = 0 (every reading)
r = 1 (1 reading per second)
r = 2 (1 reading per 10 seconds)
r = 3 I1 reading per minute)
r = 4 I1 reading per 10 minutes)
r = 5 (1 reading per hour)
T = S (every time STOKLR is pressed)
STO/CLR (Store end Clear Function)
Description
The STOKLR button is an internal part of the data store function. The
button has several functions that are listad as follows:
1. Starts the data store operation.
2. Turns off the data store operation.
3. Selects the storage rate.
4. In the R6 data rate mode the STOKLR button (when pressed) trlggers the Model 485 to store a reading.
5. In the talk only mode, the STOKLR button selects the talk rate. The
store mode must be disabled for this function.
Operation
1. Press the STOKLR button to start the data store operation ISTO annunciator on the display is turn on). At this point the Model 465 starts
storing readings.
2. Hold in the STOKLR button to select the storage rate. The rates are
scmlled on the display. Release the STOlCLR button when the
desired rate is displayed.
3. Press the STOKLR button to stop the data store operation. All data
is retained until e new store cycle has commenced.
4. When in the R6 data rate mode, prass the STOKLR button each
time a reading is to be stored. This data rate mode is used for custom
rate data storage.
5. Using the IEEE interface the STOKLR button can be used to select
the talk rate. Refer to page 17.
10
RCL (Recall Function of DATA STORE)
Description
The RCL button is used to retrieve data that has bean stored using the
store/clear function.
Operation
1. Press and hold in the RCL button. The display scrolls through the
data points and minimum/maximum readings. The first data point
displayed is the last stored reading. The next two data points are the
HI and LO readings made during that store cycle. Notice that the
longer the RCL button is held in the faster the data points scroll on
the display.
2. Release the RCL button at the desired data point and note the
reading on the display. The data pointer can be incremented by steps
of one by momentarily holding in the RCL button.
3. Turn off the data store by pressing the STO/CLR button. All stored
data is retained until a new store cycle has commenced.
MidMax HOLD
Description
The minimum/maximum hold feature detects and holds the highest and
lowest readings while in the data store mode. This action is independent
of the storage rate and runs at a rate of three readings per second. This
function works in conjunction with the data store mode. The minimum
and maximum readings are continuously updated while in the data store
mode.
Operation
1. Use the data store mode to save a number of readings.
2 Press and hold in the RCL button. The display scrolls through the
data points and the minimumlmaxlmum points. The first data point
displayed is the last data point that was stored. The next two data
points are the maximum and minimum readings made during that
store cycle.
3. Release the RCL button at the desired data point (min, max or nomral
data point) and note the reading on the display. The data pointer can
be incremented by steps of one by momentarily holding in the RCL
button.
Typical Use
Save up to 100 points of output current data along with the minimum
and maximum readings of 1pA source that needs to be verified for
calibration.
11
DIGITAL CALIBRATION
~ha diiitat calibration feature eliminates calibration potentiometers. All
calibration factors for each range are stored in non-volatile RAM;The rnstrument can be calibrated from the front panel or with the optional
4353 IEEE interface. With the Model 4653 IEEE-488 interface installed,
the Model 465 can be calibrated much faster using an automated
system. Front panel digital calibration is outlined as follows:
The following is an actual calibration procedure for
the 2Ofi range. If recalibration is not necessary, then
do not move the calibration jumper. Leave the jumper
in the disable position. Refer to the Maintenance Section of the 465 Instruction Manual for jumper place-
ment.
1. Move the calibration jumper to the enable position.
2. Turn on the Model 465.
3. Press the REL and LOG buttons simultaneously until the message
“CAL” is displayed. Release the buttons. The Model 465 is now in
the calibration mode as indicated by the “CAL” annunciator.
4. Apply the proper signal or level to the Model 465 input. Example:
place the Model 465 to the 2Ofi range and apply 19.066~.
Consult the Model 465 Instruction Manual for detailed
methods of creating the proper calibration levels.
5. Adjust the display accordingly with the usa of the STOKLR and RCL
buttons. The STOKLR button increments the displayed reading.
The RCL button decrements the displayed reading.
6. Press the LOG and REL button simultaneously until the massage
“STOR” is displayed. The “new” calibration point for the 2&A range
is now permanently stored. This new constant remains as is until
changad.
7. To return to normal operation, turn off the instrument momentarily,
then back on.
8. Turn the instrument off and place the calibration jumper in the disable
position to prevent inadvertent calibration of the instrument.
Consult the Model 465 Instruction Manual for complete details concerning Model 465 calibration. The preceding procedure is presented here to
remind the user that front panel digital calibration is available on the
Model 465.
IEEE-468 option: Allows the user to calibrate the instrument over the
IEEE-468 bus. With the IEEE48 interface installed (option 4653). the
Model 465 can be calibrated on most automated calibration systems.
NOTE
NOTE
12
IEEE-488 PROGRAMMING
Tha K&hlay Model 485 has an optional IEEE-488 interfaca (Model
4853) which can be included with the instrument or added later.
Inclusion of the interface option is apparent by the connector and
address switch at the rear panel. The field installable option kit includes a replacement top cover with appropriate access openings
on the rear panel. The following lists all the commands available to
the Model 485.
RANGE:
LOG:
RELATIVE:
ZERO CHECK:
TRIGGER:
EOI:
STORE:
DIGITAL
CALIBRATION:
SRQ:
RO = Auto Range
(RO ignored in calibration mode)
Rl = 2nA
R2 = 20 nA
R3 = 200 nA
R4= Z/UI
R5 = 20/A
R6=266d
R7= 2mA
W=Off
Dl = On
M=Off
21 = On
CO=Off
Cl = On
To = Continuous on Talk
Tl = One-shot on Talk
T2 = Continuous on GET
T3 = Oneshot on GET
T4 = Continuous on “X”
T6 = One-shot on “X”
KO = EOI is transmitted on the last byte
out.
Kl = EOI is not transmitted.
L6 = Store Calibration Constants
V+n.nnnnE+nn
n = Calibration Value
Mnnn
nnn = 0 to 255 (base 10)
MO = Clear SRQ data mask
Ml = Reading Overflow
ME = Reading Done
M9 = Reading Done or Reading Overflow
13
Ml6 = Busy
Ml7 = Busy or Reading Overflow
M24 = Busy or Reading Done
M25 = Busy, Reading Done or Reading
ovemow
P.432 = Clear SRQ Errol mask
M33 = IDDCQ
M34 = IDDC
M35 = IDDC or IDDCO
M36 = Not in Remote
M37 = Not in Remote or IDDCO
M33 = Not in Remota or IDDC
M39 = Not in Remote, IDDC or IDDCO
STATUS WORD:
DATA FORMAT: GO = Send Prefuc
TERMINATOR:
EXECUTE:
LOG
REIATNE
CALIBRATION MOM
TRIGGEFI
EQI
DATA FORMAT
UO = Output Status Word on next read.
Gl = Do Not Send Prefix
Y(ASCII) = ASCII character
Y(CR LF) = CR LF
YiLF CR) = LF CR
Y(X) = None
X = Execute other device-dependent
commands.
POWER UP DEFAULT CONDITIONS
VALUE/STATUS
Turned Qff
Reflects Front Panel Buttons
Reflects Front Panel Button
Do) off
m off
w
(TO) Continuous on Talk
(KC0 EOI is tranm-iti cm last byte
out.
(MOOO) No SRQ
Standard Output
(GO1 Prefix Enabled
(CR) ILFI
14
MODEL 4953 PRIMARY ADDRESS SWITCH SET AT 22 (10110)
TALKER ONLY
(TO) MODE
:1pljijJpg
1
ADDRESSABLE
MODE
DATA FORMAT:
(Reading)
NDCA
1 ~iiiti&.%@
* 1 .2345
E-9 CR LF
N = Normal
0 = Overflow
C = Zero Check
Z = Relative
15
STATUS:
485 CDRZKT MdMeY CR LF
r 7YzJLsIgdl,D.
DEFAULT:
4
8 5 C x D 0 R x Z 0 K
R.sfk?cts
Front Panel
0 T 0 M 0 0 0 (CR) ILFI
Reflects
Front Panel
. 1
16
Talk Only Operation
Description
The talk oniy mode may be used to send data to a listen only device such
as a printer. When the Model 465 is in the talk only mode, it ignores
commands given over the bus. The talk only mode is enabled by placing
the TOlADDRSSABLE switch in the TO position and then cycling
power to the instrument. The default talk rate is three readings per second (every reading). However, a different talk rate can be selected by
performing the following procedure.
Operation
1. Enable the talk only mode. Cycle power to the instrument.
2. Press and hold in the STOKLR button. The following talk rates scroll
on the display:
r = 0 (every reading)
r = 1 (1 reading per second)
r = 2 (1 reading per 10 seconds)
r = 3 (1 reading per minute)
r = 4 (1 reading per 10 minutes)
r = 5 (1 reading per hour)
r = 6 (1 reading per every time STOKLR is pressed)
3. Release the STOlCLR button when the desired talk rate is displayed.
At this point the ST0 annunciator appears on the display indicating
that the instrument is talking at the selected rate.
4. Turn off the data store operation by pressing the STOKLR button.
Notice that the ST0 annunciator turns off.
The instrument remains in the selected talk rate until a
new rate is selected or power is cycled.
NOTE
,
17
PROGRAMS
The fallowing programs are designed to be a simple aid to the war.
They are not intended to suit specific needs. Detailed programming information can be found in the manual.
These programs display one readhg at the output of the controller. The
program provides an ASCII string variable output of the form:
The note at the end of each program indicates modifications to provide
a numeric variable (A) in exponential form:
NDCA + O.DoOO+O CR LF
+o.ooao+o
18
IBM PERSONAL COMPUTER XT or PC
(Keithley Instruments Model 8573 GPIB Interface)
The following program sends a command string to the Model 485 from
an \BM PC or XT computer and displays the instrument reading on the
CRT. The computer must be equipped with a Keithley Instruments
Model 8573 GPIB IEEE interface and the DOS 20 operating system. The
GPIB software and hardware must be configured per the Keithley Instruments Model 8573 Instruction Manual.
DIRECTIONS
1. Using the rear panel switches set the primary address of the Model
485 to 22 (10110).
2 Wti the power off, connect the Model 485 to the IEEE-488 interface
installed in the IBM computer.
3. Using the interface software IBCONF program, set up the GPIB.COM
handler so that “DEV22” has a primary address of 22 Again, consult
the interface board instruction manual for complete details.
4. Place the instrument software disc in the default drive, type LOAD
“DECL”, and press the return key.
5. Enter the following program into the computer, pressing the return
key after each line is typed. Lines l-6 are part of the DECL program
previously loaded and naed not be typed in.
6. Run the program and type in the desired command string when
prompted. For example: to place the Modal 485 into the one shot on
talk trigger mode and in the &A range, type in Tl R4X and press the
return key.
7. The display will show the Model 485 reading string on the CRT. For
example: when the Model 485 is in Zero Check, the display will read
NDCA + O.OOOOE-6.
8. To exit the program type EXIT and press return.
PROGRAM
1 CLEAR ,160OOl
2 IBlNlTl = 160001
3 IBINlT2 = IBlNlTl + 3
4 BLOAD “BIB.M”IBINITl
5 CALL IBINITl(IBFIND,IBTRG,
BCLR,IBPCT,IBSIC,IBLOC,
IBPPC,IBBNA,IBONL,IBRSC,
IBSRE,IBRSV,IBPAD,IBSAD,
IBIST,IBDMA,IBEOS,IBTMO,
IBEOTI
6 CALL IBINITZ(lBGTS,IBCAC,
IBWAIT,IBPOKE,IBWRT,
IBWRTA,IBCMD,IBCMDA,
COMMENTS
GPIB-PC Rev. B.0
IBM BASICA Declaration
File.
19
tBRD,WRDA,tBSTOPP.tBRPP.
IBRSP,IBDIAG,IBXTRC.
IBSTA%,IBERR%,IBCNT%f
10 CLS
20 NA$=“GfIB9”:CALL IBFIND
(NAS,BRW%)
30 NAS = “DEVW:CALL IBFIND
(NAS,M485%)
40 V% =22CALL IBPAD
Wl85%,V%1
50 V% = 1:CALL IBSRE
(BRDO%,V%)
60 lNPLTT”COMMAND”;CMDS
70 IF CMDS=“EXIT” THEN 140
60 IF CMD$=“” THEN 60
90 CALL IBWRT(M485%,CMDS)
100 RDS=SPACE$(BO)
105 CALL IBRD (M485%, RD91
110 RDS= LEFWRDS,IBCNT%)
120 PRINT RDS
130 GOT0 120
140 V% =&CALL IBONL
fM485%,V%)
150 CALL IBONLlM485%,V%l
160 END
NOTE: Lines l-6 of this program need not be typed in. They are contained on the Roppy disc. When the command LOAD”DECL” is
entered, these lines are already there.
NOTE: If conversion to numeric variable is desired, change lines 110 and
120 as follows:
110 RD=VALtMIDStRDS,5,14H
120 PRINT RD
Find the board number.
Fktd the 485 number.
Change to primary address
22.
Set REN true.
Prompt for wmmand
string.
See if program is to be
halted.
If null command string go
back and get another.
Address 485 to listen and
sand command string.
Assign reading input buffer.
Trim strfng to proper size
Display the reading on the
CRT
Repeat
Close the board file.
Close the instrument fife.
20
APPLE II (APPLE Interface]
The following program obtains one reading from the Model 485 Picoam-
meter and displays the reading on th APPLE II screen, using an APPLE
IEEE-488 interface.
DIRECTIONS
1. Using the rear panel switches, set the primary address of the Model
485 to 22 (10110).
2. Connect the Model 485 to the APPLE II and APPLE IEEE-488 interface.
3. Enter the following program using the RETURN key after each line.
4. Type in RUN and depress the RETURN key.
5. The display will read “TEST SETUP”.
8. To program the Model 485 to the w range and take a reading type
in R4TlX and depress the RETURN key.
7. The disolav will read NDCA + O.OOOOE-6 when the Model 485 is in
zero ctL?cic.
PROGRAM
10 DIM A$(2O),BS(20)
20 ZS = CHRS(28)
30 INPUYTEST SETUP?“;B$
40 PR#3
50 IN#3
60 PRINT “RA”
70 PRINT “W-i%“~Z$~B$ r ,
80 PRINT “LFl”
90 PRINT “RDV”.Z$.:INPUT , r ” ‘I;
AS
100 PRINT “UT’
110 PR#O
120 IN#O
130 PRINT A$
140 GO TO 30
NOTE: If conversion to numeric variable is needed, add the following:
134 A=VAL(MIDS(AS,5,111)
136 PRINT A
COMMENTS
Dimension data string.
Terminator
Enter programming command.
Example: 2& range = R4TlX
Send output to IEEE bus.
Get input from IEEE bus.
Turn remote on.
Write BS to 485.
Linefeed On
Read data from 485.
Send output to CRT.
Get input from keyboard.
Repeat
21
HP-85
The following program obtains ooereadingfromthe W 485 Piwammeter and displays the reading on the HP85 CRT scr~-%, using the
62937A GPIB interface and an I/O ROM.
DIRECTIONS
1. Using the rear panel awitches set the primary address on the Model
465 to 22 (10110~.
2. Connect the Model 465 to the HP 62Q37A IEEE interface.
3. Enter the following program using the END LINE k8yaft8r each lineis
4. Depress the RUN key.
5. The display will read “TEST SETUP”.
6. To program the Model 465 to the 2@ range and take a reading, type
in R4TlX and depress the END LINE key.
7. The display will read NDCA + O.OOOOE--6when the Model 485 is in
Zero Check.
PROGRAM
10 REMOTE 722
20 DISP ‘TEST SETUP”
30 INPUT ES
40 OUTPUT722;B$
50 EMER 722;A$
60 DISPAS
70 GO TO 20
80 END
NOTE: If mnvetion IO numeric variable is needed, change line 60 m
follows:
60 DISP VALLASWI
COMMENTS
Set to remote.
Prompt for test setup.
Prompt the 465.
Get data from 485.
Repeat
22
HP 9825A
The following program obtains one reading from the Model 485 Picoam-
meter and displays the reading on the HP 9825A using a 98034A HPIB
interface and a 9872A extended I/O ROM.
DlRECTfONS
1. Using the rear panel switches set the primary address of the Model
485 to 22 l101101.
.-- - ..-..-,.
2. Connect the Model 485 to HP 9825A and 98034A HPIB interface.
3. Enter the following program using the STORE key after each line is
typed. Line numbers are automatically assigned by the 9825A.
4. Depress the RUN key.
5. The display will read “TEST SETUP”.
6. To program the Model 485 to the w range and tak8 a reading, type
in R4TlX and depress the CONTINUE key.
7. The displav will read NDCA + O.OOOOE-6 when the Model 485 is in
Zero Check.
PROGRAM
0 dim A$L!O~,B$I201
1 dev”485”,722
2 rem”485”
3 ent”TEST SETUP”,B$
4 wrt”485”,BS
5 red’WW,A$
6 prtA$
7 gto3
NOTE: If conversion to numeric variable is desired, omit line 6 and 7 and
substitute:
8 “e” -
A$[13,131;flt5
7 prt valtASf51)
8 gto3 Repeat
COMMENTS
Dimension data strings.
Define Model 485 address 22.
Set to remote.
Enter programming command.
(Example: w range = R4TlX)
Output program command to
Model 485 via IEEE bus.
Read data from Model 485 via
IEEE bus.
Print data on hard copy printer.
Repeat.
Convert to numeric variable.
23
HP 9818
The following program sends a command string to the Model 485
Piwammeter, reads data and displays the data on the HP 9816 CRT, us-
ing BASIC 2.0.
DIRECTIONS
1. Using the rear panel switches set the primary address of the Model
485 to 22 (10110).
2. Wnh the power off, connect the Model 485 to the HP 9816 and HP
82937A GPIB interface.
3. Type EDIT and press the EXEC key.
4. Enter the following program using the ENTER key after each line is
5. Press the HP 9815 RUN key.
6. The display will read ‘TEST SETUP”.
7. To program the Model 485 to the &A range and to take a reading
tvDe in R4X and press the ENTER kev.
8. The display will r&d NDCA
Zero Check.
PROGRAM
10 REMOTE 722
20 INPUT’I-EST SETUP” A$
40 ENTER 722;B4
50 PRINT BS
60 GOT020
70 END
NOTE: If mnversion to numeric variable is desired, change lines 40 and
50 as follows:
40 ENTER 722;B
50 PRtNTB
t O.OOObE-6 when the Model 485 is in
COMMENTS
Set to remote.
Prompt for test setup,
’ 30 OUTPUT 722; AS
Send command string to 485.
Get data string from 485.
Display data string.
Repeat
24
HP 98458
The following program obtains one reading from the Model 485 Picoammeter and displays the reading on the 98458 screen using a 98034A
HPIB interface and an I/O ROM.
DIRECTIONS
1. Using the rear panel switches set the primary address of the Model
485 to 22 IlOllO).
2. Connect the Model 485 to the HP 98458 and the 98034A interface.
3. Enter the following program using the STORE key after each line.
4. Depress the RUN key.
5. The display will read “TEST SETUP” in the lower left comer.
6. To program the Model 485 to the 2~& range and take a reading type
in R4TlX and press the EXECUTE key.
7. The display will read NDCA + 0.0000E-6 when the Model 485 is in
Zero Check.
PROGRAM COMMENTS
10 DIM ASI201, B$lZOl
20 E485 = 722
30 INPLF’TEST SEWP”,B$ Enter programming command
40 OUTPUT E485;B$
50 ENTER W35;A9 Read data from 485 via IEEE bus.
60 PRINT A$
70 GO TO 30 Repeat
NOTE: If conversion to numeric variable is desired, omit line 60 and
substitute:
60 PRINT VAL(A$IB,lll) Convert string to numeric value.
70 GO TO 30 Repeat
Define Model 485 address 22.
(Example: 2$1 rang8 = R4TlX).
Output program command to Model
485 via IEEE bus.
Print data on 98458 CRT.
25
TEK 4052
The f&owing program obtains one reading from the Model 485 Picoam-
meter and displays the reading on the TEK 4052 graphics terminal, with
a 4051 GPIB interface.
DIRECTIONS
1. Using the tear panel swltchas set the primary address of the Model
485 to 22 (101IOi.
2 Connect the Model 485 to the TEK 4051 IEEE interface.
3. Enter the following program using the RETURN key after each line.
4. Type in RUN.
5. The display will read “TEST SETUP”.
6. To program the Model 485 to the 2+A range and take a reading, type
in R4TlX and press the RETURN key.
7. The display wiil read NDCA f O.OlWOE-6 when the Model 485 is in
Zero Check.
PROGRAM
5 PRINT @ 37,o: IO, 255, I3
IO PRINT “TEST SETUP”
20 PRINT B$
30 PRINT @ 22: BS
40 INPUT % 22: AS
50 PRINT AS
60 GOT010
NOTE: If conversion to numeric variable is desired, change lines 40 and
!XtO:
40 INPUT % 22: A
80 PRINT A
COMMENTS
Prompt for the test setup.
Program the Model 485.
Get data from the Model 485.
Repeat
26
DEC LSI 11
The following program obtains one reading from the Model 485 Picoammeter and displays the reading on the DEC LSI 11 microcomputer CRT
terminal. The LSl 11 must be confiaured with 16k words of RAM and an
IBV 11 IEEE interface. The softw&e must be configured with IB soft-
ware as well as the FORTRAN and the RT 11 operating system.
DIRECTIONS
1. Using the rear panel switches set the primary address on the Model
485 to 22 f10110).
2. Connect the Model 485 to the IBV 11 IEEE cable.
3. Enter the following program, using the editor under RT 11 and the
name IPHILD.
4. Compile using the fortran compiler as follows: FORTRAN IPHILD.
5. Link with the svstem and IB libraries as follows: LINK IPHILD,IBLIB.
6. Type RUN IPHILD and depress the RETURN key.
7. The disolav will read “ENTER ADDRESS”.
8. Type in’iand depress the RETURN key.
9. The display will read “TEST SETUP”.
10. To program the Model 485 to the &A range and take a reading, type
in R4TlX and depress the RETURN key.
11. The display will read NDCA + O.OOOOE-6 when the Model 485 is in
Zero Check.
PROGRAM
INTEGER*2 PRIADR
LOGlCAL*1MSGf80),INPUT63O)
DO 2 I = 1,lO
CALL IBSTERfI,O)
2 CONTINUE
CALL IBSTER (15,5)
CALL IBTlMO (120)
CALL IBTERM (“10)
CALL IBREN
4 TYPE5
5 FORMAT flX,‘ENTER
ADDRESS’,81 ACCEPT
10, PRIADR
10 FORMAT (2141
12 TYPE 15
15 FORMAT flX,‘TEST SETUP’,$)
CALL GETSTR (5,MSG,72l
CALL IBSEOI (MSG.-l PRIADR)
COMMENTS
ITurn off IB errors.
IAllow 5 errors 16’s.
IAllow 1 second bus
timeout.
IS& LF as terminator.
ITurn remote on.
llnput the address 22.
[Prompt for the test setup.
IGet the test setup.
[Program the 485.
27
18 I = IBRECV (\NPUT,BO.PRlADR,
INPUT II + 1) = 0
CALL PUTSTR 0 \NPUT
CALL IBUNT ’ ’
GOT012
END
‘07
Wntalk the 485.
IRepeat
28
PET/CBM 2001
The following program obtains one reading from the Model 465 Picoam-
mater and displays the reading on the PET/CBM 2001 screen.
DIRECTIONS
1. Using the rear panel switches sat the primary address of the Model
465 to 22 f10110).
2. Connect the Model 465 to the PET/CBM 2001 IEEE interface.
3. Enter the following program using the RETLtRN key after each line.
4. Type RUN and depress the RETURN key.
5. The display will read “TEST SETUP”.
6. To program the Model 465 to the 2& range and take e reading, type
in R4TlX and depress the RETURN key.
7. The display will read NDCA + O.OOOOE-6 when the Model 485 is in
Zero Check.
PROGRAM
10 OPEN 622
20 INPUT “TEST SETUp”;BS
30 PRINT&B$
40 INPUT#G,A$
50 IFST = 2THEN40
60 PRINT A$
70 GOT020
NOTE: If conversion to numeric
the following:
70 A = VAL(MID$fAS,5,15))
60 PRINT “A=” .A ’ 90 GOT020
COMMENTS
Open file 6, primary address 22.
Enter programming command.
(Example: w range = R4TlX).
Output to IEEE bus.
Read data from Model 485 via IEEE
bus.
If time out, input again.
Print data.
Repeat
: variable is desired, omit line 70 and type
Convert to numerfc variable.
Repeat
29
E-H 7000 COMPUTER
The following program sends a data string from the E-H computer to the
Modei 485 Picoammeter and then displays the instrument reading on
the computer CRT. The hH 7000 must be configured with MS-DOS
and BASICA as outlined in its instruction manual.
DIRECTIONS
1. Using ffie rear panel switches set the primary address of the Model
485 to 22 (10110).
2. With the power off, connect the Model 485 to PORT 1 of the computer.
3. While in BASICA, type LOAD “EHE488.CMP” to Load the GPIB
handler software.
4. Add the lines below to the front of the program now [n memory;
press the return key after each line is typed. The complete program
including the GPIB handler software may now be saved in the usual
manner.
5. Press the computer F2 key to run the program. The CRT will prompt
with COMMAND?.
6. TVpe in the desired command. For example: To program the instru-
ment to the w range and take a reading, type in R4TIX and press
the return key.
7. The computer CRT will then display the instrument’s data string on
the CRT. For example: with the Model 485 on the w range and with
Zero Check enabled, the data string reads NDCA f O.OOOOE-6.
PROGRAM COMMENTS
10 CLS
20 GOSUB 65010
30 CALL PORT1
40 CALL INIT
50 DEV$=“22”
60 INPUT “COMMAND’CG
70 IF C$ = ” ” THEN sd
80 INS = SPACES 120)
90 CALL SNDSTRlDEVS,C$)
100 CALL RCVSTR(DEV$,INS)
110 PRlNT INS
120 GO TO 60
NOTE: For conversion to numeric variable, change line 110 to:
110 PRINT VALfMIDS(tN$,5,152))
‘Initialize handler software.
‘Initialize Port 1.
‘Initialize interface.
‘Primary address = 22.
‘Prompt for command string.
‘If null input go back.
‘Define reading buffer.
‘Send command string to 4135.
‘Get reading from 485.
‘Display reading string on CRT.
‘Repeat
30
Test Instrumentation Group
28775 Aurora Road /Cleveland, Ohio 44139
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