80 Series III
Users Manual
Determining Pulse Width
For a periodic waveform (its pattern repeats at equal time intervals), you can determine the amount of time that the signal is high or low as follows:
1.Measure the signal’s frequency.
2.Press Fa second time to measure the signal’s duty cycle. Press Tto select a measurement of the signal’s positive or negative pulse. (Refer to Figure 8.)
3.Use the following formula to determine the pulse width:
Pulse Width | = % Duty Cycle ÷ 100 | |
(in seconds) |
| Frequency |
Analog Bar Graph
The analog bar graph functions like the needle on an analog meter, but without the overshoot. The bar graph is updated 40 times per second. Because the graph responds 10 times faster than the digital display, it is useful for making peak and null adjustments and observing rapidly changing inputs.
Model 87 Bar Graph
Model 87’s bar graph consists of 32 segments. The position of the pointer on the display represents the last three digits of the digital display. For example, for inputs of 500 Ω, 1500 Ω, and 2500 Ω, the pointer is near 0.5 on the scale. If the last three digits are 999, the pointer is at the far right of the scale. As the digits increment past 000, the pointer wraps back to the left side of the display. The polarity indicator at the left of the graph indicates the polarity of the input.
28
