User Manual
Table Of Contents
- Getting started
- Oscilloscope basics
- Analog versus digital:
- Waveforms:
- Measuring probe:
- Connecting the probe:
- Setting up the board:
- Experiment 1: Measuring AC voltage
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- What we see:
- Experiment 2: Adjustable AC voltage
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- Experiment 3: Measuring AC grid frequency and period
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- Experiment 4: Rectified AC, single phase
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- A little theory:
- Experiment 5: Rectified AC, dual phase
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- A little theory:
- Exercise:
- Experiment 6: Smoothed versus unsmoothed DC (ripple)
- Connection layout:
- Connection summary:
- Purpose:
- A little theory:
- How?:
- Experiment 7: DC measurement
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- Exercise:
- Experiment 8: Waveform with adjustable frequency
- Connection layout:
- Connection summary:
- Purpose:
- How?:
- How does it work?
- Exercise:
- What is the purpose of the ‘slope’-symbol?
8 9
Exp.2: Adjustable AC voltage (advantages of the auto-setup function)
Turn RV1 a little further clockwise. The signal goes off-
screen and the Vrms readout displays ?????mV, because
the unit is no longer capable of calculating the correct Vrms.
How can we display the current signal correctly again?
IncreasetheV/divsettingto0.1V/div.Asyouwillsee,thesignaltsthescreenagain.
If you turn RV1 clockwise again, the signal will go off screen again.
Changing V/div to 0.2V/div once again restores the display.
You can continue this process until RV1 is turned fully clockwise. In that case, we will measure the
full input voltage, which we also measured in experiment 1.
Is there a better way of measuring unknown voltages?
Yes there is, by using the ‘auto-setup’-function.
Keep pressing any of the arrow keys until V/div and time/div are displayed in reverse
video. The trace immediately adjusts for optimal viewing.
Now you can adjust the voltage from 0 to max. by turning RV1. At any time, the trace
will be displayed correctly and it will not go off-screen. At the lower right-hand corner,
the current Vrms will be correctly displayed.
Experiment 3: Measuring AC grid frequency
and period
Connection layout:
Connection summary:
GND clip : 2
Probe tip : 3
Purpose:
The purpose of this experiment is to demonstrate the use of the markers to perform on-screen
measurement of frequency and period.
How?:
1. Turn on the HPS140 Handheld Pocket Scope (see HPS140 manual for How-To instructions).
2. Place the probe switch “x1/x10” to ‘x1’.
Press the lower right button, this will freeze the screen and
turn-on the markers. The upper right button allows us to toggle
between the different markers.
There are 4 markers, two horizontal and two vertical. The horizontal markers allow us to measure the
amplitude of a displayed signal, i.e. it measures how many volts there are between both markers. The
vertical markers allow us to measure time between the two markers. In order to measure the frequency
of a periodic signal, we can use the vertical markers and isolate one period of the signal.
Press the upper right button repeatedly, to select
vertical marker 1. Next, use the arrow keys to
position marker 1 on the sine wave as shown.
NOTES:
Measuring AC grid frequency and period