Tektronix DMM4020 Digital-Multimeter, DMM, VFD-Multiple segment, 20000 counts CAT II 600 V DMM4020-A1 Data Sheet

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The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3-

2 for an overview of the display annunciators and indicators. 
The dual display is comprised of a primary display and a secondary display, which show 

measurement readings, annunciators and messages. The annunciators indicate 

measurement units and the Meter’s operating configuration. 
The dual display allows you to see two properties for the input signal you are measuring. 

The Meter alternates between properties, measuring the first property and showing it on 

one display, and then measuring the second property and showing it on the other display. 

(For more detail, see the “How the Meter Takes Dual Display Measurements” section in 

Appendix A.) 
If an input exceeds the full-scale value of the selected range, the Meter displays 0Lto 

indicate an overload.  

The primary display comprises the lower segment of the dual display, and consists of the 

larger digits and annunciators. The primary display shows measurements taken using the 

relative readings (REL), minimum maximum (MIN MAX), Touch Hold (HOLD), and 

decibels (dB) function modifiers. 

The secondary display comprises the upper segment of the dual display, and consists of 

the smaller digits and annunciators. 
Function modifiers REL, HOLD, MIN MAX, and dB and the manual range mode cannot 

be selected for the secondary display. The secondary display is either in autorange, or the 

same range as the primary display if both displays are in the same function. 

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