Kenosha Reuse Discussion Board > WAUKEEGAN, IL
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> 54501A 100 mhz 4 channel digital oscilloscope w probe
54501A 100 mhz 4 channel digital oscilloscope w probe
Bandwidth (-3 dB) Dc-coupled Repetitive dc to 100 MHz
Single-shot dc to 1 MHz Rise Time 3.5 ns
Number of Channels 4 (2+2): Channels 2 and 3 are limited attenuator inputs, optimized for digital signals.
Vertical Sensitivity Range 5 mV/div to 5 V/div (channels 1 and 2)
Maximum Sample Rate 10 MSa/s
Waveform Record Length 501 points (display)
Input C 16 pF nominal Input Coupling ac, dc
Autoscale, auto measurements, Delta V and T measurements.
Pattern trigger , complex trigger
Electronic condition Excellent
I have reconditioned and calibrated this unit. The Unit passes all self tests. It passes and holds calibration.
Cosmetic condition This unit has been cleaned up inside and out. It has some CRT trace burn most visible when the power is off. That s typical for these models. When the power is on it is not distracting. On a scale of 1 to 10 this one is a 8+. The chassis is solid and clean.
Warranty Contact me for fair resolution on any problem. 14 days money back if it fails self-test.
Choosing the right scope for your application,,,,, see my store for other models (watronics92)
You need to purchase the right scope for your application. In general the first consideration is bandwidth, but bandwidth is not that simple. You need to be aware of the bandwidth in both the Single Shot / Real Time mode as well as the Repetitive mode.
Repetitive mode In the repetitive mode the waveform is constructed by triggering and acquiring data on successive repeating events. If the particular signal of interest is repetitive like a system clock, then a very accurate waveform can be constructed from repeated acquisitions.
A sampling technique is used to sample and hold so that the A/D converter has time to convert analog to digital. Data is randomly sampled then converted to digital. A fine interpolator is used to precisely (40 psec or better) measure the time between the samples taken and the analog trigger event. Data can now be placed in a memory buffer precisely positioned in time relative to analog trigger. With successive acquisitions, the buffer is eventually filled. High bandwidth can be achieved with relatively slow less expensive A/D converters.
Real Time / Single Shot mode In this mode, the entire waveform must be captured on a single trigger. Naturally this requires a very high performance FAST A/D converter. (No sample and hold). The fine interpolator is still used to place data precisely relative to the analog trigger event.
The bottom line on bandwidth If you are trouble shooting and looking for a rare glitch that might cause an error in your system, you need to think about Real Time / Single Shot bandwidth . On the other hand if you are designing a clock distribution system and are looking at repetitive clocks, then repetitive bandwidth will work fine for you.
Bandwidth, Sample rate, channel count, memory depth, and trigger features must all be considered. If you are trouble shooting logic circuits, the complex trigger features will be very important.
Of the scopes I sell, the HP 54501A and the 54503A are optimized to be high bandwidth repetitive scopes. They do have a low bandwidth single shot capability.
The 54502, 54504, and the 54510A/B are the Single Shot scopes designed for Single Shot work. They could easily have 500 MHz repetitive bandwidth like the 54503A but their analog bandwidth has been dinged slightly to prevent aliasing during digital reconstruction. The 54510A has a 1 GSa/s A/D converter so the sample interval is 1 nsec. We like 4 samples per period for reconstruction so a 250 MHz signal (4 nsec period) would be sampled 4 times by a 1 GSa/s A/D.
This is a 6 bit A/D converter. All the others are 8 bits. (can be improved with averaging)
**Special feature called sequential capture.
The 54720A/D is a very high performance separate family of scopes see my write up on this line of scopes. It can achieve up to 8 GSa/s!!!!!
