Section 2: General operation
Models 707B and 708B Switching Matrix Reference Manual
2-10
707B-901-01 Rev. B / January 2015
Power-up
Line power connection
Follow the procedure below to connect the Model 707B or 708B to line power and turn on the
instrument.
The Model 707B or 708B operates from a line voltage of 100 V to 240 V at a frequency of 50 Hz or 60
Hz. Line voltage is automatically sensed (there are no switches to set). Make sure the operating
voltage in your area is compatible.
The power cord supplied with the Model 707B or 708B contains a separate protective earth
(safety ground) wire for use with grounded outlets. When proper connections are made, the
instrument chassis is connected to power-line ground through the ground wire in the power
cord. In addition, a redundant protective earth connection is provided through a screw on
the rear panel. This terminal should be connected to a known protective earth. In the event
of a failure, not using a properly grounded protective earth and grounded outlet may result
in personal injury or death due to electric shock.
Do not replace detachable MAINS supply cords with inadequately rated cords. Failure to
use properly rated cords may result in personal injury or death due to electric shock.
Operating the instrument on an incorrect line voltage may cause damage to the instrument, possibly
voiding the warranty.
To connect the Model 707B or 708B to line power and turn on the instrument:
1. Make sure that the front panel power switch is in the off (0) position. See
(on page 2-11) for switch location.
2. Connect the female end of the supplied power cord to the power connection (AC receptacle) on
the rear panel. See
(on page 2-1) for connector location.
3. Connect the other end of the power cord to a grounded AC outlet.
4. Turn on the instrument by pressing the front panel power switch to the on (I) position.
Power-up sequence
When the instrument is turned on, the instrument performs self-tests and momentarily lights all
segments and indicators on the display. If a failure is detected, the instrument momentarily displays
an error message. Error messages are listed in
(on page 8-1).
If there are no errors, three dots are briefly displayed. On the Model 707B, the crosspoint display
shows the text "Wait for Init to End." When initialization is complete, the bottom display shows
"KEITHLEY Model 707B." The Model 708B displays "KEITHLEY Model 708B."
