1-20 Getting Started Model 6485 and 6487 User’s Manual
Power-up sequence
The following power-up sequence occurs when the Model 6485/6487 is turned on:
1. The Model 6485/6487 performs self-tests on its EPROM and RAM with all digits
and ann
unciators turned on. (For the Model 6487 at power-up, the VOLTAGE
SOURCE OPERATE LED will come on for 0.7 seconds to indicate that it is func-
tional.) If a failure is detected, the instrument momentarily displays an error mes-
sage and the ERR annunciator turns on. Error messages are listed in Appendix B of
the Mod
el 6485 Instruction Manual or Model 6487 Reference Manual.
NOTE If a pr
oblem develops while the instrument is under warranty, return it to
Keithley Instruments Inc., for repair.
2. If the instrument passes the self-tests, the firm
ware revision levels are displayed.
For example:
6485 A01 or 648
7 A01
3. After the firmware revision levels are dis
played, the detected line frequency is
displayed.
For example:
FREQ: 60Hz
4. After the detected line frequency is displayed, information on the selected remote
interface is
displayed:
a. GPIB — If the GPIB is the selected interface, the instrument will display the
selected language (SCPI or DDC) and primary address.
Model 6485 Examples:
SCPI ADDR: 14
DDC ADDR: 14
Model 6487 Examples:
SCPI ADDR: 22
DDC ADDR: 22
b. RS-232
— If RS-232 is the selected interface, the instrument will display the baud
rate setting. For example:
RS-232: 9600b
5. If the FACTory setup is selected as the power-on setup, the unit is placed in the
default reading mode after the communication information is displayed. If a setup
other than FACTory is selected, the configured setup will be displayed. For exam-
ple, if the USR1 setup (User Setup #1) is selected:
USING USR1
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