Bk-precision 5491B - Manual User Manual download pdf (Page 27)

Figure 3-6 Diode Measurement

Note: Source current flows from the to COM terminals

3.8 Measuring True RMS AC+DC

The multimeter can measure the True RMS value of AC+DC voltages or currents (available in manual

range mode only).

When is pressed, the multimeter will measure the dc and ac signals respectively and then

calculate and display the AC+DC RMS value by using the following formula:

)( acdcRMSDCAC 

3.8.1 Connections

Assuming the multimeter is under factory default conditions, the basic procedure to measure true RMA

AC+DC is as follows:

1. Connect test leads to and COM terminals, as shown in Figure 3-7.

2. Press , , → or → to select a voltage or current

measurement

3. Press for true RMS measurement function.

4. Press + to turn on a 2nd display

5. Press or to select a 2

parameter available.

6. Take a reading from the display.

Diode

DCV

ACV

DCV

ACV

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Bk-precision 5491B - Manual User Manual Page 27