Getting Started Tutorial 1
Keysight U3402A User’s and Service Guide 25
The display at a glance
Figure 1-6 VFD full display with all segments illuminated.
The highly visible vacuum fluorescent display (VFD) annunciator are described in 
Table 1-1.
Table 1-1 Display annunciators 
Annunciator Description
Primary display
SReading rate: Slow
M Reading rate: Medium
FReading rate: Fast
PEAK Peak measurement. Not applicable for the U3402A.
HOLD Data hold 
MIN MinMax math operation: Minimum value shown on the primary display
MAX MinMax math operation: Maximum value shown on the primary display
REL Relative value
dBm Decibel unit relative to 1 mW
4 2 W 4-wire/2-wire resistance 
Diode test
Audible continuity test for resistance
AUTO Autoranging