Velleman-projects EDU06 Assembly instructions Manuel d'utilisateur télécharger pdf (Page 16)

Experiment 7:

DC measurement

Connection layout:

Connection summary:

GND clip : 4

Probe tip : 6

Purpose:

The purpose of this experiment is to show that a scope is also suited to measure DC voltages.

In general, scopes are used to measure AC voltages. For DC voltages, a multimeter is ﬁ ne. However, if

you don’t have a multimeter at hand, you can still perform DC measurements with a scope.

MAKE SURE THE SCOPE IS SET UP CORRECTLY FOR DC MEASUREMENTS

How?:

Place the probe switch “x1/x10” to ‘x1’.1.

Turn on the HPS140 Handheld Pocket Scope, it will turn on in ‘auto-set’ mode. 2.

‘Auto setup’ will also work for DC measurements.

There are 3 important settings that need to be performed for correct DC measurement:

DC input coupling•

DC readout•

DC reference•

DC input coupling:

Input coupling needs to be set to DC (=). When set to AC, the scope will block any DC signal, so we

won’t be able to perform DC measurements. At start-up, the unit is automatically set to DC coupling.

Next, we will set the readout in the bottom right hand corner to DC.

Press and hold the upper right hand button until the menu appears.

Release the button and press it again a number of times until the

‘readout’ setting is highlighted

(123 appears in the lower left hand corner).

Next, press any of the arrow keys repeatedly until Vdc is displayed.

Wait for the unit to return to scope screen.

It now displays the measured DC voltage in the lower right hand

corner.

NOTES:

DC measurement

nnection summary:

Dclip:4

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Velleman-projects EDU06 Assembly instructions Manuel d'utilisateur Page 16