4 Using the Digital Multimeter Functions  
110 Agilent U1602B/U1604B User’s and Service Guide 
8 Press F3 to perform automatic measurement for minimum, maximum 
and average readings.
9 Press F4 to refresh and recollect measurement reading. 
Figure 4-10 Humidity measurement
Pressure Meter
A pressure adapter is required to perform the pressure measurement. The 
instrument auto- selects the most proper measurement range and displays 
in proper decimal point, value and symbols.
To perform pressure measurement, follow the instructions below:
1 Press   button to access meter menu.
2 Press F3 to access auxiliary submenu.
3 In the auxiliary submenu, press F4 to select the pressure meter.
4 In the pressure meter submenu, press F1 to select measurement unit to 
either psi or kPa.
5 Ensure the pressure adapter positive terminal (+) is connected to 
instrument input terminal   and negative terminal (–) to COM 
input jacks of the instrument.
6 Touch the material under test with the probe tip. 
7 Read the pressure reading from the display. The display indicates the 
proper decimal point, value and symbols.