. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. fV\ \r\r\ < ?ID m sec^ 10m s ec ? Point -4 Point 8 T Y Figure Point C. Figure again, when it drops back to earth potential. This waveform is differentiated by the 0-01 [x¥ capacitor and the 5k resistor so that only the transients are preserved as positive and negative pips; the latter are removed by the crystal diode. Variable frequency RC oscillators are frequently used for time marking. It is then possible to choose a frequency so that the marker trace has the appearance of
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. fV\ \r\r\ < ?ID m sec^ 10m s ec ? Point -4 Point 8 T Y Figure Point C. Figure again, when it drops back to earth potential. This waveform is differentiated by the 0-01 [x¥ capacitor and the 5k resistor so that only the transients are preserved as positive and negative pips; the latter are removed by the crystal diode. Variable frequency RC oscillators are frequently used for time marking. It is then possible to choose a frequency so that the marker trace has the appearance of Figure rather than In this case the position of the peaks of the waves is not difficult to measure off. A frequency accuracy of 1 per cent may be expected from the cheaper commercial models, and 0-1 per cent from the superior variety. For really accurate work recourse may be had to a valve-maintained tuning fork or to a quartz crystal oscillator. The former is capable of 644. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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