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1S1: Difference between revisions
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|series=500-series scopes | |series=500-series scopes | ||
|type=1S1 | |type=1S1 | ||
|summary= | |summary=1 GHz sampling system | ||
|image=Tek 1s1 front2.jpeg | |image=Tek 1s1 front2.jpeg | ||
|caption=1S1 front view | |caption=1S1 front view | ||
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to allow the use of high-impedance probes with the 50 Ω input of the 1S1 (at reduced bandwidth). | to allow the use of high-impedance probes with the 50 Ω input of the 1S1 (at reduced bandwidth). | ||
{{ | {{BeginSpecs}} | ||
{{Spec| Rise time | 350 ps}} | |||
{{Spec| Bandwidth | 1 GHz }} | |||
{{Spec| Trigger bandwidth | 100 MHz (Norm/Auto trigger), 1 GHz (HF sync) }} | |||
{{Spec| Vertical deflection | 2 mV/div to 200 mV/div in 1−2−5 sequence }} | |||
{{Spec| Sweep rate | 50 µs/div to 1 ns/div in 1−2−5 sequence, magnifier up to ×100 }} | |||
{{Spec| Input impedance | 50 Ω }} | |||
{{Spec| Output | Front-panel, vertical 200 mV/div; horizontal 1 V/div into a high-impedance load }} | |||
{{Spec| Maximum input | 5 V peak }} | |||
{{EndSpecs}} | |||
==Operation== | ==Operation== | ||
The 1S1 can operate in normal self-swept mode or an external sweep signal can be applied to the 1S1. | The 1S1 can operate in normal self-swept mode, or an external sweep signal can be applied to the 1S1. | ||
With the 1S1's internal sweep disabled, the horizontal-in and vertical-out connections can be used | With the 1S1's internal sweep disabled, the horizontal-in and vertical-out connections can be used | ||
so the 1S1 acts as a lookup table, a mapping of X to Y, a function. | so the 1S1 acts as a lookup table, a mapping of X to Y, a function. | ||
The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler. | The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler. | ||
In this mode, the horizontal-in voltage controls the time after the trigger event when the sample should be taken, | In this mode, the horizontal-in voltage controls the time after the trigger event when the sample should be taken, | ||
and the vertical-out voltage corresponds to the voltage measured at that instant. | and the vertical-out voltage corresponds to the voltage measured at that instant. | ||
This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage | This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage | ||
and ADC to read the sampled output. But perhaps more importantly, by setting a constant horizontal-in voltage, | and ADC to read the sampled output. But perhaps more importantly, by setting a constant horizontal-in voltage, | ||
it allows the output signal at one equivalent time instant to be processed in the time domain. | it allows the output signal at one equivalent time instant to be processed in the time domain. | ||
For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured. | For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured. | ||
The other reason why one might want a signal that consists of multiple sequential measurements | The other reason why one might want a signal that consists of multiple sequential measurements | ||
of the same equivalent-time instant is that statistics can be calculated on these observations. | of the same equivalent-time instant is that statistics can be calculated on these observations. | ||