Getting Started 1
Keysight U1610/20A User’s Guide 21
Charge the Battery
Before using the handheld scope for the first time or after a prolonged storage 
period, fully charge the battery for at least 3 hours, with the handheld scope 
turned off, using the AC/DC adapter provided. If the battery is fully discharged 
after subsequent use, charge the battery with the handheld scope turned on.
The power key   will turn constant yellow when the battery is fully charged.
Unplug the power adapter when measuring signals to improve the common 
mode rejection.