LeCroy DIGITAL FILTER PACKAGE Software
Hersteller:
Modell:
DIGITAL FILTER PACKAGE
Datum:
2001
Kategorie:
Gruppe:
Beschreibung:
Digital Filter

Information

THE NEED In today’s complex environment, data is frequently composed of a mixture of analog and digital components spread over a broad range of frequencies. In many applications, the relevant data is encoded or obscured. Capturing the right signals becomes a challenge. Engineers find it increasingly difficulty to examine only those parts of the data they are interested in. Traditional (or even smart) Oscilloscope triggering cannot always provide a satisfactory answer. For example, servo motors from disk drives add a low frequency component to the high frequency data output. It is hard to achieve an accurate analysis of data unless the low component is removed. Another common example is switched Power supply units, which inject the switching frequency component into many system parts. Viewing digital signals mixed with this switching frequency component could be very difficult. Filtering is definitely required. Yet another example is in ADSL residential connectivity, where data is transmitted over 256 narrow bands. Each band is only 4.7kHz wide, and the gap between two adjacent bands is also 4.7kHz. Examining such complex waveforms with regular DSOs is almost impossible; filtering out unwanted frequency components is necessary. THE SOLUTION At present, these needs are addressed in two ways. One way is building analog filters and placing them in front of the oscilloscope, providing an already filtered signal to the DSO. The disadvantages of this approach are many. Analog filters depend heavily on the accuracy and stability of analog components. Although in some cases analog filters are easily implemented, they are quite impractical for low (< 100 Hz) or high (> 100 MHz) frequency ranges. In comparison, digital filters can provide the desired results in those cases. The second approach, practiced by many engineers, is using the DSO as a digitizer. The digitized data output is then transferred to a PC for processing. This solution frequently provides the required results, but it might be too slow or too limited in flexibility for some applications. With the DIGITAL Filter PACKAGE LeCroy provides a solution that combines the best of both worlds. This package includes seven of the most useful Filter types, in addition to a custom design feature. You can easily set the edge (or corner) frequency in addition to the transition region width for each Filter. It is possible to use single filters or multiple (up to four) filters cascaded for even more complex filtering. Once filtered, waveforms include mostly relevant frequency components, undesired parts being greatly attenuated. If filters with special characteristics are desired, the custom design feature allows you to design unique filters tailored to your specific needs. The required Filter can be designed with a digital Filter design or math package such as MATLAB® or Mathcad®. Filter coefficients can be directly downloaded from the program into the scope, using the DSOFilter utility. It is also possible to specify the Filter coefficients on an Excel spreadsheet and to use DSOFilter to download them from the spreadsheet to the scope. Enhanced Solutions DFP can be coupled with other LeCroy Software products — such as AORM, JTA, PMA1 or DDA — to enhance the capabilities of these products and to provide improved solutions. For example • Jitter Measurement: the DFP Band-pass Filter can be coupled with the JTA package to measure jitter over a narrow frequency range. • Optical Recording: In some cases equalization with a different response is required. In such a case, the DFP custom Filter feature can be used in conjunction with AORM. The required custom Filter can be easily implemented to provide the necessary equalization, while all other AORM functions remain unchanged. • Power Measurement: A Band-stop Filter can be coupled with the PMA1 package to eliminate the switching Power supply frequency component from power lines. The Band-stop Filter can be tuned to match a specific Power supply switching characteristic.

mehr

Bedienungsanleitung
Dokumenttyp:
Bedienungsanleitung
Seiten:
32
Größe:
1.14 Mbytes (1198360 Bytes)
Sprache:
english
Revision:
B
Dokument-ID:
DFP-OM-E
Datum:
01 Juli 2001
Qualität:
Elektronisches Dokument, kein Scan, sehr gut lesbar.
Upload Datum:
07 Januar 2021
MD5:
041d57928f8a70e854c4e00e80f3d5ab
Downloads:
194

Information

OPERATOR’S MANUAL 1 Introduction 1–1 The Need 1–1 The Solution 1–1 Enhanced Solutions 1–4 Filter Types 1–5 Low-pass Filter 1–5 High-pass Filter 1–5 Band-pass Filter 1–6 Band-stop Filter 1–6 Communication Channel Filters 1–7 Raised Cosine (a low-pass filter) 1–7 Raised Root Cosine (a low-pass filter) 1–8 Gaussian 1–9 2 Operation 2–1 Setting up the scope 2–1 Running DFP 2–1 3 Remote Commands 3–1 Define Command 3–1 Examples 3–2 4 Custom Filters 4–1 Custom Filter Setup 4–1 Example 1: Using Mathcad 2000 (Visual Basic Script) 4–2 Example 2: Sending FIR Coefficients from Excel 4–5 5 Multirate Filters 5–1 Description 5–1 Example 5–1 6 Specifications 6–1

mehr

Kommentare

Noch keine Kommentare, sei der erste Poster!

Kommentar hinzufügen

* Pflichtfeld
1000
Captcha Image