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1、LeCroy Corporation 700 Chestnut Ridge Road Chestnut Ridge NY 10977-6499 USA Phone: 1-800-5-LECROY 1-914-425-2000 FAX: 1-914-425-8967 WP03 -PARAMETER ANALYSIS PACKAGE OPERATION AND PROGRAMMING MANUAL 9300 SERIES DIGITAL STORAGE OSCILLOSCOPES RadioFans.CN 收音机爱 好者资料库 ? ?!? 700 Chestnut Ridge Road Chest
2、nut Ridge, NY 109776499 Tel: (914) 578 6020, Fax: (914) 578 5985 ?#? 2, rue du Pr-de-la-Fontaine 1217 Meyrin 1/Geneva, Switzerland Tel: (41) 22 719 21 11, Fax: (41) 22 782 39 15 $?%? Copyright July 1998, LeCroy. All rights reserved. Information in this publication supersedes all earlier versions. Sp
3、ecifications subject to change. LeCroy, ProBus and SMART Trigger are registered trademarks of LeCroy Corporation. Centronics is a registered trademark of Data Computer Corp. Epson is a registered trademark of Epson America Inc. I2C is a trademark of Philips. MathCad is a registered trademark of MATH
4、SOFT Inc. MATLAB is a registered trademark of The MathWorks, Inc. Microsoft, MS and Microsoft Access are registered trademarks, and Windows and NT trademarks, of Microsoft Corporation. PowerPC is a registered trademark of IBM Microelectronics. DeskJet, ThinkJet, QuietJet, LaserJet, PaintJet, HP 7470
5、 and HP 7550 are registered trademarks of Hewlett-Packard Company. LCXXX-WPO3-OM-ERev D0898 RadioFans.CN 收音机爱 好者资料库 ? ? ? ?.11 ? ? ?. 21 ?!? ?.210 ?#?$? ?.31 ?.32 ?.33 ? .34 ?.35 ?.36 ?.37 ? !?.38 ? .39 #?.310 ?$?.311 ?.312 $?%?%?.313 $? sigma = bin count *(bin value -mean) bin count 1ii 2 i i 1 n i
6、 1 n /() = , where n is the number of bins in the histogram, bin count is the count or height of a bin and bin value is the center value of the range of parameter values a bin can represent. ?For the histogram: Value (volts) Count# 4.14.04.24.34.4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 mean = ( 2 * 4.1 + 3*
7、4.3 + 1 * 4.4) / 6 = 4.25 sigma = (2*(4.1 - 4.25) + 3*(4.3 - 4.25) + 1*(4.4 - 4.25) ) / (6-1) 222 = .1225 ? ? ?$?$? #?Calculates the total population of a histogram between the parameter cursors. #?$?The count for all populated bins between the parameter cursors is summed. ? Count 1 2 3 4 5 The tota
8、l population of this histogram is 9. ? ? (?$01?(2?0 #?Returns the value of the xxth peak that is the largest by area in a histogram. #?$? First the peaks in a histogram are determined and ranked in order of total area (for a discussion on how peaks are identified see the description for the pks para
9、meter). The center of the nth ranked peak (the point where the area to the left is equal to the area to the right), where n is selected by the user, is then returned as xapk. ?The rightmost peak is the largest, and thus the first-ranked, in area (1). The leftmost peak, although higher, is ranked sec
10、ond by area (2). The lowest peak is also the smallest in area (3). Largest-area peak 1 2 3 3? ? 3 ?4? The Trend waveform processing function enables the creation of graphs of successive waveform parameter measurement values. It provides useful visual information on waveform parameter variation. And,
11、 used together with other scope features, it allows the graphing of certain parameters against others. ? 1. Select and configure a custom parameter, which will be used to perform the measurement that is to be trended. This can be done by either: ?choosing “Custom” mode from the “MEASURE” “Parameters
12、” menu group as for histograms (see page 13 of the present manual and the CURSORS/MEASURE ? To set the number of points in certain math functions, using the associated menu knob. 3? ? ? ?The display of defined traces is controlled by the TRACE ON/OFF buttons. ?Expansion, or zooming, and positioning
13、of traces is controlled by the horizontal and vertical ZOOM and POSITION knobs. ?When Multi-zoom is on, the ZOOM and POSITION knobs are coupled and control all displayed traces at once. This is particularly useful when multiple trends of related parameters are displayed. ?The button resets the multi
14、plier for the trace expansion to 1 and the offset positioning to 0. The button should be pressed for each reconfigured trace in order that traces can be cleanly and correctly positioned on-screen. 3? ? *8?;?6 ?! allows the selected trace (here, Trace A) to be set up for trending. ? To define the tre
15、nd as using math necessary for the trend itself to be defined. Traces can be defined to use math or as zooms of other traces. As trending is a math function, “use Math?” should be set to “Yes”, using the corresponding menu button. ?%$? For selecting “Trend”. ?6-8?-89#?*8?;? To access more trend setu
16、p options and the final trend-dedicated menu (next page). ?9#?89?8-?!9#?8?=? For positioning the trend automatically once it has been calculated. “FIND CENTER AND HEIGHT” places the trace appropriately, centering and scaling the trend without affecting the zoom and position settings. But ensure that
17、 these settings have been reset (as described on the previous page). ? To select the parameter for trending, using the corresponding menu button or associated knob. Any of the configured parameters, displayed on the line beneath the grid, can be chosen. ;?$? For selecting using button or knob the nu
18、mber of values in the trend. A maximum of 20 000 values can be chosen for any one trend. When this maximum is exceeded, the parameter results scroll off the trend. 3? ? ? Press after having configured the parameter in “CHANGE PARAM” to return to the menus shown this page. ?-89#?!? this menu group ap
19、pears when “MORE TREND SETUP” is selected (previous page). ? To select “All” for every parameter calculation on each waveform to be placed in the trend. Or “Average” to trend only the average of all the given values calculated on a given acquisition, and to obtain one point in the trend per acquisit
20、ion. Unless this is specifically required, “All” should be selected. ?!-!?8?8-?*8?;? To access the setup menus for the selected parameter, the same menus as the “CHANGE PARAM” group. ?9#?89?8-?!9#?8?=? For positioning the trend automatically once calculated. “FIND CENTER AND HEIGHT” places the trace
21、 appropriately, centering and scaling the trend without affecting the zoom and position settings. But ensure that these settings have been reset (as described in the panel on page 41). ? For selecting the mantissa, exponent or number of digits resolution, using the associated knob. The configuration
22、 is the value at the horizontal center line on the grid, while units are those of the parameter trended. ? To select using button or knob the vertical value of each vertical screen division. Units are those of the parameter trended. 3? ? ? Once the trend has been configured, parameter values will be
23、 calculated and trended on each subsequent acquisition. Immediately following the acquisition, its trend values will be calculated. The resulting trend is a waveform of data points that can be used the same way as any other waveform. Parameters can be calculated on it, and it can zoomed, serve as th
24、e x or y trace in an XY plot, and used in cursor measurements. The sequence for acquiring trend data is: 1. trigger 2. waveform acquisition 3. parameter calculation(s) 4. trend update 5. trigger re-arm. If the timebase is set in non-segmented mode, a single acquisition occurs prior to parameter calc
25、ulations. However, in segment mode an acquisition for each segment occurs prior to parameter calculations. If the source of trend data is a memory, storing new data to memory effectively acts as a trigger and acquisition. Because updating the screen can take significant processing time, it occurs on
26、ly once a second, minimizing trigger dead-time (under remote control the display can be turned off to maximize measurement speed). ?,?The oscilloscope maintains a circular parameter buffer of the last 20 000 measurements made, including values that fall outside the set trend range. If the maximum nu
27、mber of events to be used in a trend is a number N less than 20 000, the trend will be continuously updated with the last N events as new acquisitions occur. If the maximum number is greater than 20 000, the trend will be updated until the number of events is equal to N. Then, if the number of bins
28、or the trend range is modified, the scope will use the parameter buffer values to redraw the trend with either the last N or 20 000 values acquired whichever is the lesser. 3? ? The parameter buffer thereby allows trends to be redisplayed using an acquired set of values and settings that produce a d
29、istribution shape with the most useful information. In many cases the optimal range is not readily apparent. So the scope has a powerful range-finding function. If required it will examine the values in the parameter buffer to calculate an optimal range and redisplay the trend using it. The instrume
30、nt will also give a running count of the number of parameter values that fall within, below and above the range. If any fall below or above the range, the range-finder can then recalculate to include these parameter values, as long as they are still within the buffer. ?8?The parameter cursors can be
31、 used to determine the value and population of selected areas. Figure 4.1 shows the Time cursors (Annotation ) positioned on the selected trend vertex, whose order number () and value () are also shown. Figure 4.1 2 3 1 1 ? ! avg parameter, 26, 31 ( Binning menu, 217 ? Center menu, 219 classify into
32、 menu, 217 CLEAR SWEEPS, 15 CURSORS MEASURE, 11 ? defining for trends, 42 DELETE ALL PARAMETERS menu, 15 ) FIND CENTER AND HEIGHT menu, 45 FIND CENTER AND WIDTH menu, 215 from menu, 12 fwhm parameter, 26, 32 fwxx parameter, 26, 33 * graphing parameters, 41 ? hampl parameter, 26, 34 hbase parameter,
33、26, 35 high parameter, 26, 36 histograms binning and measurement accuracy, 27 clearing events, 224 defining waveform parameters, 210 definition, 2122 Displayed Trace Field, 17, 214, 224 displaying all captured events, 215 DSO process, 22 events, 21 histogram parameters, 25 histogram peaks, 26, 314 i
34、con, 222 information window, 216 list of parameters, 25 maximum number of parameter events used, 213 measuring individual bin values, 225 number of parameter events captured, 24 parameter buffer, 23 range, 21 range display, 225 segmented waveforms, 24, 26, 223 selecting number of bins, 217 setting o
35、ptimal number of bins, 28 setting range center and width, 219 statistics category, 25 waveform acquisitions and histograms, 23 zoom traces, 26, 223 hmedian parameter, 26, 37 hrms parameter, 26, 38 htop parameter, 26, 39 + low parameter, 26, 310 & Math setup, 42 Math Setup, 11 MATH SETUP, 211 maxp pa
36、rameter, 26, 311 MEASURE menu, 13 mode menu, 13 mode parameter, 26, 312 MORE xxxx SETUP menu, 15 More Hist Setup menu, 216 Multi-Zoom, 42 $ parameter cursors, 12 Parameter Setup, 45 Parameter Setup menu, 221 parameter values factors affecting, 15 segmented waveforms, 15 with statistics on, 15 Parame
37、ter values in trending, 46 parameters changing, 1213 lines of, 13 selecting, 1213 pct1 parameter, 26 pctl parameter, 313 pks parameter, 26, 314 , range parameter, 26, 316 REDEFINE A menu, 211 REDEFINE menus, 42 ? Scale menu, 217 setting no. points in math functions, 42 SETUP menu, 217 sigma paramete
38、r, 26, 317 Statistics category, 13 ? Time cursors, 49 to menu, 12 totp parameter, 26, 318 TREND menu, 45 trend setup and configuration, 42 trends, 41 list of parameters, 47 number of parameter events captured, 47 parameter buffer, 46 segmented waveforms, 47 using measurement cursors, 49 waveform acquisitions and histograms, 46 - use Math? menu, 212, 44 using up to menu, 213 . Width menu, 219 / xapk parameter, 26, 319
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