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

 

 

 

 

3

 

  

3-9 

Ranging operations are performed using R, Uand V. Press R to toggle 

between autorange and manual range modes. When autoranging is selected, Auto Range 

is displayed. When manual ranging is selected, Manual Range is displayed.  
In autoranging mode, the Meter automatically selects the next higher range when a 

reading is greater than full-scale. If no higher range is available, 0L is displayed on the 

primary or secondary display to indicate an overload. The Meter automatically selects a 

lower range when a reading is less than 95 % of full-scale of the lower range. 
In autoranging mode, pressing U or V changes the mode to manual ranging. If U 

is pressed, the next higher range is selected (if there is one). If V is pressed, the next 

lower range is selected.  
In manual ranging mode, the range that is set when you enter the mode becomes the 

selected range. The Meter remains in the selected range regardless of input. Manual 

ranging can only be performed on readings shown on the primary display. The secondary 

display is in autorange or when the primary and secondary displays are set to the same 

function, the secondary display uses the same range as the primary display. 

The Meter takes measurements at one of three user-selected rates: slow, medium, and 

fast. Rate selection allows you to maximize measurement speed, which can affect 

accuracy. The rate selected is shown in the primary display as Slow, Medium, or Fast. 
Press J to step through the measurement rates. The rate selected applies to all basic 

measurements except frequency. When frequency is measured, the rate is fixed at 

4 measurements per second. Pressing J does not affect the frequency update rate.The 

measurement rate is always fast for Diode and Continuity test.  

To select a measurement function, press the applicable function button (See Table 3-1). 

The applicable annunciator is displayed to indicate the selected function. (For example, to 

measure dc voltage, press D. DC is displayed.) 
To select ac + dc total rms readings, simultaneously press A and D for more than 

two seconds; or simultaneously press B and E for more than two seconds. 
If a reading is shown on the secondary display when a function button is pressed, the 

secondary display turns off and that function is selected for the primary display. 

The Meter is capable of measuring voltage up to 1000 V dc and 750 V ac. 

W

 Caution 

To perform a voltage measurement: 

1.  Connect test leads between the Meter and the circuit under test as shown in 

Figure 3-4. 

2.  Press D to measure dc voltage or A to measure ac voltage.