1 Quick Start
28 Keysight 34420A Service Guide
If the Meter Does Not Turn On
Use the following steps to help solve problems you might experience when
turning on the meter. If you need more help, see the Service Guide for instructions
on returning the meter to Keysight Technologies for service.
1 Verify there is ac power to the meter.
First verify that the meter’s power switch is in the “On” position. Make sure the
power cord is firmly plugged into the power module on the meter’s rear panel.
Verify that the power source is energized.
2 Verify the power-line voltage setting.
The line voltage is set to the proper value for your country when the meter is
shipped from the factory. Change the voltage setting if it is not correct. The
settings are: 100, 120, 220, or 240 Vac (for 230 Vac operation, use the 220 Vac
setting).
See the diagram on the next page to verify or change the setting.
To replace the 250 mAT 250 V fuse, order part number 2110-0817. This fuse is
used for all power line voltage settings.
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