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?
6 7
Experiment 1: Measuring AC voltage
Connection layout:
Connection summary:
GND clip : 2
Probe tip : 1
Purpose:
The purpose of this experiment is to display and measure AC voltage. In this particular case, we will
measure the AC voltage supplied to the board.
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’.
The unit always starts up in ‘auto-setup’ mode. You can tell that
it is in auto-setup mode, because the readouts for Volts/div and
Time/div are displayed in ‘reverse video’ (white characters on
dark background). Thanks to the auto-setup mode, the unit takes care of V/div and time/div for you,
you do not have to do anything. In the lower right-hand corner, the RMS value of the supplied AC
voltage is displayed. More about auto-setup in the next experiment.
What we see:
• Select ‘AC coupling’ (see HPS140 manual for How-To instructions)
• Set time/div to 5ms/div
• Set volts/div: to 10V/div
Note: the readout in the bottom right hand corner displays the RMS value of the measured AC voltage.
Different readouts are available (see HPS140 manual for How-To instructions).
Note: If you live in an area where the AC grid frequency is 60Hz instead of 50Hz (e.g. US), the image may
slightly vary.
Exp.1: measuring AC voltage
Experiment 2: Adjustable AC voltage
(advantages of the auto-setup function)
Connection layout:
Connection summary:
GND clip : 2
Probe tip : 3
Purpose:
The purpose of this experiment is to show the advantages of the auto-setup function to measure AC
voltage.
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’.
Trimmer RV1 allows us to adjust the output voltage on test
point 3 between 0V and the full input voltage. Turn RV1 fully
anti-clockwise (0V output). The trace on our oscilloscope
screenremainsaatline,asthereisnoinputvoltage.
Next, set V/div to 50mV/div
(see HPS140 manual for How-To instructions).
Slightly turn RV1 clockwise until a sine wave is displayed on
the screen. You only need to turn it slightly before the signal
appears. If the signal goes ‘off-screen’, turn RV1 anti-clock-
wise until the signal is correctly displayed. In the lower right
hand corner, you can read the current RMS value of the AC
voltage measured, e.g. 100mV (0.1V)
Exp.2: Adjustable AC voltage (advantages of the auto-setup function)
NOTES: NOTES: