Tenma 72-7615 Manual page 21

Digital storage oscilloscope
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Setting up Auto Measurement
The AUTO button on the control
panel is the function key for
auto measurement.
The oscilloscope is capable of measuring 20 waveform parameters.
Press MEASURE to enter the parameter measurement display menu which has five
zones for simultaneous display of measurement values assigned to function keys
F1 to F5 respectively. When selecting the measurement type of any zone, press the
corresponding function key to enter the type option menu.
The measurement type option menu lets you choose voltage or time. You can enter
the voltage or time measurement by pressing F1~F5 for the corresponding type and
then return to the measurement display menu.
Pressing F5 and select ALL PARAMETERS to show all measured parameters of
both voltage and time. Press F2 to select the channel (has to be enabled to take
measurements).
Press F1 to return to the parameter measurement menu.
Automatic measurement of voltage parameters
The DSO series oscilloscope can automatically measure the following voltage
parameters.
Peak to peak value (Vpp) - the voltage value from the highest point to lowest point
of the waveform.
Maximum value (Vmax) - the voltage value from the highest point to ground of the
waveform.
Minimum value (Vmin) - the voltage value from the highest point to ground of the
waveform.
Amplitude value (Vamp) - the voltage value from top to base of the waveform.
Top value (Vtop) - the voltage value from the level top to ground of the waveform.
Base value (Vbase) - the voltage value from the level base to ground of the
waveform.
Overshoot - the ratio value of the difference between maximum value and top value
of the waveform to the amplitude value.
Pre-shoot - the ratio value of the difference between minimum value and base value
of the waveform to the amplitude value.
Average value - average amplitude of signals within 1 cycle.
RMS value - the effective value. Energy generated by AC signal conversion during
one cycle with respect to the DC voltage that produces equivalent energy.
Automatic measurement of time parameters
The DSO series oscilloscope can automatically measure the following parameters.
Rise time - the time taken by the waveform to rise from10% to 90%.
Fall time - the time taken for the waveform to fall from 90% to 10%.
Positive pulse (+width) - pulse width of positive pulse at 50% amplitude.
Negative pulse (-width) - pulse width of negative pulse at 50% amplitude.
Delay 1g2 (Rising Edge) - delayed time of the rising edge of CH1, Ch2.
Delay 1g2 (Falling Edge) - delayed time of the falling edge of CH1, Ch2.
Positive duty ratio (+Duty) - ratio of positive pulse width to cycle.
Negative duty ratio (-Duty) - ratio of negative pulse width to cycle.
21

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