Tektronix 3321, 3322, 3330 User manual
3321
/3322/3330
LCZ
Meter
Calibration
1
Tfus
plied calibration program.
verification procedures covered in Section
show that instrument performance
Dunng calibration,
and the resulting calibration constants are downloaded into the
ments
level.
I
NTRO D UCT
paclung list grves step-by-step procedures for calibrating
are
made using a digital multimeter
If
the calibration procedures cannot be performed successfully, refer to
formation in the service manual unless the
der warranty should be returned to the factory or authorized repair facility for repair.)
I0
N
This
calibration procedure can be performed at specified intervals, or
1
is
not within specifications.
a
set of standard resistances
in
of the Model 3321/3322 Service Manual or Model 3330 Service Manual
is
measured twice, the resulting data
order to calibrate the voltage measurement display function and signal
NOTE
unit
the
Model 3321/3322/3330
LCZ
is
still
2 CALIBRATION PROGRAM REQUIREMENTS
is
processed
meter. For the Model
the
under warranty. (Units
Packing
LCZ
Meter using the sup-
if
the performance
by
the computer,
3330,
additionai measue-
repair in-
strll
un-
List
The supplied calibration program must be used to calibrate the Model
run
on an IBM PC
to
2.1
The
2.1.1
Use the factory default settings with the National Instruments PC-IIA interface board. When using older versions
of the PC-IIA interface (those not equipped with a
use
IIA
change the driver configuration for operation with the PC-IIAboard. See the interface board documentation for details.'
Computer hardware requ-ts
following
IBM-PC
One of the
with
boards, and the driver defaults to the
AT,
National Instruments PC-IIA interface card.
Keithley Metrabyte KM48-ROM interface card.
Using the National Instruments PC-IIA
the
PC-IIA
AT
or compatible computer with appropriate hardware, as covered below.
computer hardware
or compatible computer.
two
following IEEE-488 interfaces for the computer:
card. The older version of the interface software uses a single driver for both the
is
required for calibration:
board
VLSI
PC-II
board.
Use
chip), the interface driver software
the "IBCONEEXE" utibty supplied with the interface to
3321/3322/3330.
Tfus
program
must
be corhgured for
PC-II
is
intended
and PC-
PA-390
Rev.
A
/
12-92
2.1.2 Using
the Keithley Metrabyte KM-488-ROM
board
When using the KM-488-ROM board,
which should be disabled. Refer to the documentation supplied with the interface board for detailed information
on defaults and disabling the on-card ROM.
2.2
The following computer
2.3
Before using the supplied calibration program, first make a backup copy of the diskette, then copy the contents of
the diskette to a convenient subdirectory on
tory before attempting to
The
Computer software requirements
software
MS-DOS or
PC-DOS,
version
Program installation
run
the calibration program.
following programs are supplied on the distribution diskette or created during program execution:
CAL.EXE: Calibration program intended for use in calibrating the Model
use
is
required to
3.30
or later.
the default switch settings for
run
the calibration programs:
your
hard drive. Be
sure
to
select
all
operating modes except for the ROM,
this
subdirectory as the current
3321/3322/3330.
direc-
MAKEFILE.EXE:
of resistance standards to ensure accurate calibration.
SAVESET
must be located
REFDATA:
resistance standards
the calibration program environment data variables, which are specified when the program
A
utility
program that allows you to set up the "REFDATA" file values for
A
file that contains the environment data variables for the calibration program. Note that
in
the same directory as the calibration program, and the filename cannot be changed.
The reference data file that contains the actual resistance, capacitance, and inductance values of the
used
by the calibration program. Note that
ttus
file must be located
RECOMMENDED CALIBRATION EQUIPMENT
Table 1 summarizes recommended equipment for calibrating the Model
is
computer hardware, which
covered separately
in
paragraph
2.
3321/3322/3330.
your
particular set
in
a path specified by
is
run.
This
list does not include
this
file
Table
1.
Recommended test equipment for calibration
Equipment
Resistance standards*
Digtal Multimeter**
GPTB
cable(s)***
BNC cable**
Manufacturer
Hewlett-Packard
HP
16074A
Hewlett-Packard
Fluke
8840A/8842A
Keithley
Keithley
7007-1
7051
3458A
or
BNC Adapte?
Shorting jumper
Resistance standards should be accurately characterized for resistance,
the supplied calibration data for values.
*
Required only when calibrating Model 3330. Multimeter must be equipped with
**
One
GPIB
cable
4
requkd
CALIBRATION ENVIRONMENT
for Model 3321 /3322 calibration.
Two
GPIB
Calibration should be performed under the following conditions:
Temperature: 23°C
Humidity:
50%
Supply voltage: 12OVAC or 22OVAC
i
k
20%
1°C
*'/o
Description
OPEN,
lorn,
SHORT,
lOOkf2
loon,
values
System multimeter
Shielded
IEEE-488
cable
BNC-to-BNC cable
BNC-to-dual banana plug
Test lead with clips on each end
series
inductance, and parallel capacitance.
cables
reqd
IEEE-488
interface.
for Model 3330 calibration.
1w2,
See
The Model 3321/3322/3330 should be turned on and allowed to warm up for one-half hour before calibration.
instrument has been subjected to extreme temperature or humidity, allow additional time for stabilization.
5
5.1
The reference data file,
resistance standards you use for calibrating the LCZ meter. Data stored in
ibration program at
Before performing calibration, you should update the reference data file with the actual values
dards
REFERENCE DATA
Overview
"REFDATA,"
run
time.
you intend to use.
In
FILE
stores the actual resistance, series inductance, and parallel capacitance of the
this
file are automatically read by the
of
the resistance stan-
addition, these values should be updated whenever the resistance standards are cali-
brated.
two
There are
1.
Use a text editor to edit the current file.
general ways to create the reference data file:
2. Use the supplied utility called "MAKEFILE.EXE" to create the reference data file.
is
Each of these methods
outlined below.
If
the
cal-
3
5.2
Resistance standards values
Resistance standards values are supplied by the manufacturer on a calibration sheet.
will
value, both an inductance and capacitance value
be supplied.
be specified as a negative value. Similarly, the capacitance will be specified
inductive.
Any
negative capacitance or inductance value should be entered as 0 in the reference data file, asoutlined
If
the standard
is
capacitive, the inductance will
as
a
negative value
below.
5.3
Use
Editing the reference data file
an
ASCII
text editor to edit the present
#Reference
#Date:
##
100
100
##
lk
n
1000
##
10k
10000
#look
~
100E3
10-18-1992
n
n
C.2
“REFDATA”
Z
R-standards
15:20:57
0
0
0
0
file.
An
example of the file is shown below:
123456
0
0
0
0
In
addition to the resistance
if
the standard
is
Note that the file includes the serial number, date, and time created. The four lines of calibration data information
are for the four standards in the following order:
and SHORT standards
are
included
in
the
file.
Values may be entered in standard floating point format with scientific notation as necessary.
with the
#
character
is
assumed to be a comment line and
100R,
1w1,1Ow1,
and
100W.
is
not interpreted as a standard value by the calibration
Note that no values for the
Any
line that begins
OPEN
program.
NOTE
’
l3e
sure
to maintain the proper file format outlined above, or the calibration program
will
not
run
properly.
Each calibration data line
is
the resistance
in
ohms
ductance in henries (H).
has
three
numeric values, which are delimited by space or tab characters. The first value
(n),
the second value
If
a capacitance or inductance value
is
the parallel capacitance in farads
is
listed
(F),
and the
as
being negative, enter a value of 0 for that
third
value
is
the
in-
parameter in the reference data file.
4
5.4
Using
the
MAKEFILE.EXE
utility
The preferred method to create the reference data file
to
use
this
utility
to create the reference data file.
1.
While in the calibration program subdirectory, type
MAKEFILE
The program will prompt you to enter the
<Enten
lOOR
I"
STANDARD:
Rdc
=
2.
Enter the actual resistance value of
3.
The computer will then prompt you to enter the parallel capacitance of
your
lOOR
is
to
use
the
in
the following:
resistance standard values
STANDARD DATA.
100R
resistance standard
"MAKEFILE.EXE"
as
follows:
in
ohms,
then press <Enter>.
your
standard at the following prompt:
utility. Follow the steps below
cp
=
4.
If the capacitance
capacitance
5.
The computer will then prompt you to enter the series inductance of the
is
listed as a positive value, enter the capacitance value
is
listed as a negative value, enter a value of 0 for Cp.
Ls=
6.
If the inductance listed on the calibration sheet
<Enter>. If the listed inductance
7.
Repeat steps
8.
After
you
1
through
have entered all resistance standards values, the computer will display a
6
STANDARD:
STANDARD
STANDARD:
STANDARD:
for the 1w2,
is
negative, enter a value
lorn,
CALIBRATION STANDARD DATA
lOOR
1w2
low2
1OOw2
If
OK,
and
press
is
positive, enter the series inductance in henries, then press
of
0
for
lOOkR
resistance standards.
Rdc: 100
Rdc: 1000
Rdc:lOOOO
100E3
Rdc:
[RETURN
key].
Ls.
cp:o
cp:o
Cp:O
Cp:O
in
farads, then press <Enter>.
1000
standard:
summary
of
Ls:o
Ls:
0
Ls:O
Ls:O
all
values:
If
the
-
5
9.
Press <Enter>
through 6 above to re-enter values.
10.
After all values are entered
if
all values are correct, or press
any
other key to reenter standards values. Follow steps
and
accepted, the program will prompt you for the reference data filename:
1
STANDARD
File name ’refdata’.
[RETURN]
11.
Simply press <Enter> to use the default “REFDATA” filename, or press any other key, then enter the desired
filename at the prompt.
sponding environment data variable
12. Finally, enter the serial number of your standards set at the prompt, then press <Enter>. The reference data file
will then be saved
6
The following paragraphs will *take you through the procedure necessary to complete calibration of the Model
3321/3322/3330 LCZ Meter. Before performing calibration, you must have previously completed the following:
CALIBRATION PROCEDURE
Installed the calibration software (paragraph 2).
Installed and configured the computer
NOTE:
using
the selected filename, and the program
key to continue. Any other key to change filename
If
you use a filename other
in
FILE
NAME
than
“REFDATA,”
the calibration program. See paragraph 6 for details.
will
end.
IEEE-488
interface.
you
must also change the corre-
Setup the reference data file with the correct resistance standards values (paragraph
6.1
6.1.1
Before performing calibration, the Model 3321/3322/3330 must be connected to the
computer.
If’you
ure
Hardware preparation
Connections
Use
only a shielded
If
you are calibrating multiple units, connect
IEEE-488
one LCZ meter during a calibration session.
are
calibrating the Model 3330, connect the multimeter to the computer and the LCZ meter, as shown
1.
IEEE-488
bus at a time. Manually change bus connections when calibrating more than
cable such as the recommended Keithley Model 7007-1.
NOTE
only
one Model 3321/3322/3330 to the
GPIB
5).
(IEEE-488)
interface of the
in
Fig-
6
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