Calibration
2-4
2.6.2 Required order of command execution
When calibrating from the front panel, the Model 2001 will
automatically prompt you in the correct order for various cal-
ibration steps. When calibrating over the IEEE-488 bus,
however, the calibration sequence is determined by the order
in which commands are received. Note that the Model 2001
must receive calibration commands in a specific order as
covered below.
Comprehensive calibration
The following rules must be observed when sending bus
commands to perform comprehensive calibration. These
rules assume that comprehensive calibration has been en-
abled by pressing the CAL switch after instrument power is
turned on.
1. The Model 2001 must execute all commands in the
:CAL:PROT:DC subsystem before the
:CAL:PROT:DC:CALC command will be executed.
Commands in the :CAL:PROT:DC subsystem can be
sent in any order with the exception of the CALC com-
mand.
2. The Model 2001 must execute the following commands
before it will execute the :CAL:PROT:SAVE command:
• All :CAL:PROT:DC subsystem commands.
• The :CAL:PROT:DATE command.
• The :CAL:PROT:NDUE command.
Low-level calibration
The following rules must be observed when sending com-
mands to perform low-level calibration. These rules assume
that low-level calibration has been enabled by pressing the
CAL switch while turning on instrument power.
1. The Model 2001 must execute all commands in the
:CAL:PROT:DC subsystem before the
:CAL:PROT:DC:CALC command will be executed.
Commands in the :CAL:PROT:DC subsystem can be
executed in any order (except for CALC).
2. The Model 2001 must execute all commands in the
:CAL:PROT:DC subsystem, and it must execute the
:CAL:UNPR:AC command before it will execute any of
the low-level commands.
3. There are a total of 15 low-level calibration steps, all of
which must be executed before the
:CAL:PROT:LLEV:CALC command will be executed.
The 15 low-level calibration steps must be executed in
order (step 1 through step 15).
Step 1 is always a valid next step, which allows you to
restart the low-level calibration procedure at any time.
Similarly, the present step is always a valid next step, al-
lowing you to repeat a calibration step if necessary. The
next low-level step in numerical order is always valid.
4. The Model 2001 must execute the following commands
before it will execute the :CAL:PROT:SAVE command:
• All :CAL:PROT:DC subsystem commands.
• The :CAL:UNPR:ACC command.
• All :CAL:PROT:LLEV subsystem commands.
• The :CAL:PROT:DATE command.
• The :CAL:PROT:NDUE command.
2.6.3 Example calibration command program
Program 2-1 below will allow you to type in calibration com-
mands and send them to the instrument. If the command is a
query, the information will be requested from the instrument
and displayed on the computer screen. The program uses the
*OPC command to detect the end of each calibration step, as
discussed in paragraph 3.6 in Section 3.
NOTE
See Appendix B for a summary of com-
plete calibration programs.
Program requirements
In order to use this program, you will need the following:
• IBM PC, AT, or compatible computer.
• IOtech Personal488, CEC PC-488, or National Instru-
ments PC-II or IIA IEEE-488 interface for the comput-
er.
• Shielded IEEE-488 cable (Keithley Model 7007)
• MS-DOS or PC-DOS version 3.3 or later.
• Microsoft QuickBASIC, version 4.0 or later.
• IOtech Driver488 IEEE-488 bus driver, Rev. 2.3 or lat-
er. (NOTE: Later versions of Driver488 may not sup-
port other manufacturers’ interface cards.)
Program instructions
1. With the power off, connect the Model 2001 to the
IEEE-488 interface of the computer.
2. Turn on the computer and the Model 2001. Press in on
the CAL switch to unlock calibration.
3. Make sure the Model 2001 is set for a primary address
of 16. You can check or change the address as follows:
A. Press MENU, select GPIB, then press ENTER.
B. Select MODE, then press ENTER.
C. Select ADDRESSABLE, and press ENTER.
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