Using the Digital Multimeter Functions 4 
Agilent U1602B/U1604B User’s and Service Guide  99
8 Press F3 to perform automatic measurement for minimum, maximum 
and average readings.
9 Press F4 to refresh and recollect measurement reading. 
Figure 4-2 DC measurement display
Ensure the probe tips are in contact with the metal contacts inside the outlet. 
Improper contact may lead to inaccurate voltage measurement. This poses to cause 
risk of electrocution if the device under test is powered, but this however fails to be 
detected by the instrument due to poor contact. 
To hold the reading, press   button.
Do not switch on or off a motor under test when measuring AC or DC voltage. This is to 
avoid the instrument from being damaged due to large voltage surge during the on and 
off operation.