lecroy 93XXC-OM-E16 电路图.pdf

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1、? ? measured times to the trigger point. In Relative Mode, a pair of Amplitude or Time cursors is controlled, providing readings on the difference between the two in amplitude, or time and amplitude, respectively. Amplitudes are shown in the Trace Label for each trace. When Time cursors are used, th

2、e time is shown below the grid. And in Relative Mode the frequency corresponding to the time interval between the cursors is also displayed there. When there are few data points displayed, Time-cursor positions are linearly interpolated between the data points. Time cursors move up and down along th

3、ese straight-line segments. ?LVSODIn XY Display, Absolute-Amplitude cursors are horizontal and vertical bars that can be moved both up and down and from sidetoside across the screen. Relative-Amplitude cursors are pairs of bars that move in the same way. Absolute- and Relative-Time cursors behave as

4、 they do in Standard Display. Combinations of the amplitude values are shown on the left-hand side of the grid in the following top-to-bottom order: 1. “Y value / X value”. Ratio 2. “20 log 10 (ratio)”. Ratio in dB units 3. “Y value X value”. Product 4. “f = arc tan (Y / X) range 180 to +180”. Angle

5、 (polar) 5. “r = sqrt (X X + Y Y)”. Radius (distance to origin). The definition of X and Y depends on the cursor used. The table below shows how X and Y are defined for each type of measurement. or “Diff vertical for voltage appearing, respectively, at the top and left-hand edge of the grid. LIIHUHQ

6、FH?FXUVRU For controlling the Difference cursor, available when “Relative” is selected from “type” (see above), using the associated menu knob. minimum and maximum are used to assign top and base. Only an upper limit could be estimated (the actual value of the parameter may be smaller than the displ

7、ayed value. The signal is partially in overflow. The signal is partially in underflow. The signal is partially in overflow and in underflow. ? &856256?0($685(?3DUDPHWHUV 0($685(?3DUDPHWHUV?6WDQGDUG?9ROWDJH This mode measures, for a single trace: ? PeaktoPeak (amplitude between maximum and minimum sa

8、mple values) ? Mean of all sample values (corrected for periodic signals) ? Standard Deviation ? Root Mean Square of all sample values (corrected for periodic signals) ? Amplitude of the signal. 2II?&XUVRUV?3DUDPHWHUV To select “Parameters”. PRGH To select “Standard Voltage” parameters. VWDWLVWLFV F

9、or turning “On” display of the parameters average, lowest, highest, and standard deviation, as well as the number of sweeps included in the statistics cleared each time the acquisition conditions change or when the CLEAR SWEEPS button is pressed. As long as “Parameters” is highlighted in the top men

10、u, the accumulation of statistics continues, even if the statistics are not shown. RQ?WUDFH To select the trace for which the voltage parameters are measured. The choices available in this menu will depend on the traces displayed (a maximum of four traces can be displayed). Here, Traces 1 and 2 are

11、displayed and “2” selected. IURP To determine the starting point, in screen divisions, for parameter measurements, using the associated menu knob. “Track” “On”, links control of both the starting and end points of the parameter measurement so that they can be moved together using the associated menu

12、 knob. WR To determine the end point in screen divisions. Also indicates the total number of data points used for the measurements. ? 0($685(?3DUDPHWHUV?6WDQGDUG?7LPH This mode measures for a single trace: ? Period ? Width (at 50% amplitude) ? Rise time (1090% of amplitude) ? Fall time (9010% of amp

13、litude) ? Delay (from trigger to first 50% amplitude point). 2II?&XUVRUV?3DUDPHWHUV To select “Parameters”. PRGH For selecting “Standard Time” parameters. VWDWLVWLFV For turning “On” display of the parameters average, lowest, highest, and standard deviation, as well as the number of sweeps included

14、in the statistics cleared each time the acquisition conditions change or when the CLEAR SWEEPS button is pressed. As long as “Parameters” is highlighted in the top menu, the accumulation of statistics continues, even if the statistics are not shown. RQ?WUDFH For selecting the trace for which the tim

15、e parameters are to be measured. The choices available in this menu will depend on the traces displayed (a maximum of four traces can be displayed). Here, Traces 1 and 2 are displayed and “2” selected. IURP To determine the starting point, in screen divisions, for parameter measurements. “Track” “On

16、”, links control of both the starting and end points of the parameter measurement so that they can be moved together using the associated menu knob. WR To determine the end point in screen divisions. Also indicates the total number of data points used for the measurements. ? &856256?0($685(?3DUDPHWH

17、UV 0($685(?3DUDPHWHUV?&XVWRP In this mode, up to five parameters can be displayed for various traces. 2II?&XUVRUV?3DUDPHWHUV For selecting “Parameters”. PRGH To select “Custom” parameters. VWDWLVWLFV For turning “On” display of the parameters average, lowest, highest, and standard deviation, as well

18、 as the number of sweeps included in the statistics cleared each time the acquisition conditions change or when the CLEAR SWEEPS button is pressed. As long as “Parameters” is highlighted in the top menu, the accumulation of statistics continues, even if the statistics are not shown. &+$1*(?3$5$0(7(5

19、6 For accessing the secondary “CHANGE PARAM” menu (see following pages). IURP To determine the starting point, in screen divisions, for parameter measurements. “Track” “On”, links control of both the starting and end points of the parameter measurement so that they can be moved together using the as

20、sociated menu knob. WR To determine the end point in screen divisions. ? &+$1*(?3$5$0 for modifying parameters. 2Q?OLQH To select for modification up to five different parameters, “1”, “2”, “3”, “4”, or “5”. &DWHJRU To specify the category of parameter. When “All” is selected, the “measure” menu (se

21、e below) will feature all parameters. However, when a particular category is selected, only those parameters in the category are shown. (/(7(?$/?3$5$0(7(56 For deleting all parameters previously selected. PHDVXUH To choose the new parameter to be measured on this line. When “ ” is selected the line

22、is not used. RI For selecting the channel or trace on which the parameter will be measured (four-channel menu shown). ? &856256?0($685(?3DUDPHWHUV &+$1*(?3$5$0Parameters can be customized to meet specific needs: 2Q?OLQH To select for modification up to five different parameters, “1”, “2”, “3”, “4”,

23、or “5”. &DWHJRU To specify the category or type of parameter. 025(?W#OY?6(783 Calls up the”tlv” customization menu (next page). PHDVXUH Set at tlv. VRXUFH Using the menu button, selects the channel “1”, “2” (“3” or “4”) or memory (“A”, “B”, “C”, or “D”). While the knob selects “from” which and “to”

24、which channel the measurement is to be made. ? 6(783“tlv” for customizing the tlv parameter. OHYHOV?DUH For selecting whether the levels should be set in absolute or percentage of the peaktopeak signal value. KVWHUHVLV To set the hysteresis division. Hysteresis essentially enables the user to set a

25、voltage band, which a waveform peaktrough pair must exceed in order not be considered either noise or a “bump”. This threshold crossing is recognized when an acquisition point in the waveform passes through the threshold level by 1/2 the hysteresis- division setting. IURP For selecting the voltage s

26、etting: the level on the trace at which the timing should start. And to select where the timing should start: “Pos” for rising edge, “Neg” for falling edge, “First” for either positive or negative edges. WR For selecting the voltage setting: the level on the trace at which the timing should finish.

27、And to select where the timing should finish: “Pos” for rising edge, “Neg” for falling edge, “First” for either positive or negative edges. ? &856256?0($685(?3DUDPHWHUV 6(783“c2d+” for customizing the c2d+ parameter. KVWHUHVLV To set the hysteresis division. Hysteresis essentially enables the user t

28、o set a voltage band, which a waveform peaktrough pair must exceed in order not be considered either noise or a “bump”. This threshold crossing is recognized when an acquisition point in the waveform passes through the threshold level by 1/2 the hysteresis- division setting. FORFN?HGJH To select the

29、 clock edge or edges used for this parameter measurement. GDWD?HGJH For selecting the data edge or edges used for the measurement. ? 3DVV?)DLO?7HVWLQJ Parameters can also be used in carrying out Pass/Fail tests. These tests require a combination of measurements within chosen limits, using an action

30、provoked when the test either passes or fails, depending on which has been specified. Signals can also be Pass/Fail tested against a tolerance mask. Up to five parameters can be tested against limits at the same time. And, in tolerance mask testing, a trace can be compared to a tolerance mask. Wheth

31、er the tests pass or fail, any or all of the following actions can be provoked: ? Stop capturing further signals ? Dump the screen image to a hardcopy unit ? Store selected traces to internal memory, to a memory card (optional), or to a floppy ? Sound the buzzer ? Emit a pulse on the CAL BNC. The Pa

32、ss/Fail display will show: ? Results on the current waveforms ? Number of events passing ? Total number of sweeps treated ? Actions to be taken. ? &856256?0($685(?3DUDPHWHUV 0($685(?3DUDPHWHUV?3DVV?)DLO 2II?&XUVRUV?3DUDPHWHUV To select “Parameters”. PRGH To select “Pass” or “Fail”. WHVWLQJ For turni

33、ng testing “Off” or “On”. Testing is turned off in order to observe only the parameter variations. &+$1*(?7(67?&21,7,216 To access the secondary “CHANGE TEST” menu (see next page) IURP To determine the starting point, in screen divisions, for parameter measurements. WR To determine the end point in

34、screen divisions. ? &+$1*(?7(67 2Q?OLQH To select for modification up to five different parameters, “1, 2, 3, 4 or 5” 7HVW?RQ To select “Param” or, if no test is required, “- (No Test)”. FKRRVH To select “Param”. (/(7(?$/?7(676 For deleting all tests previously selected. PHDVXUH For selecting the ne

35、w parameter to be measured on this line. When “ ” is selected the line is not used. RI For selecting the channel or trace on which the parameter will be measured (four-channel menu shown). ? &856256?0($685(?3DUDPHWHUV &+$1*(?7(67?3DUDP?&KDQJLQJ?/LPLWV?IRU?3DVV?)DLO?7HVWV?RQ?3DUDPHWHUV? 2Q?OLQH To se

36、lect for modification up to five different parameters, “1, 2, 3, 4 or 5”. 7HVW?RQ To Select “Param” or “- (No Test)” if no test required on the selected line (“Mask” selection, page 1417). FKRRVH For setting to “Limit” (“Param” 1415). (/(7(?$/?7(676 For deleting all tests previously selected. 7UXH?L

37、I For selecting the adequate relation smaller than “”. OLPLW To make the choice of one of three modifications of a limit: its mantissa, exponent, and the number of digits for the representation of its mantissa. The corresponding menu button is used to select, and the associated knob to modify the nu

38、mber in that field. 6(7?72?/$7(67?9$/8( To set the limit to the latest measured value a starting value for the final adjustment. ? &+$1*(?7(67?0DVN?&KDQJLQJ?3DVV?)DLO?7HVW?RQ?D?0DVN? 2Q?OLQH To select for modification up to five different parameters, “1, 2, 3, 4 or 5” (“Action” selection, page 1420)

39、. 7HVW?RQ For setting to “Mask” or “- (No Test)” if no test required on the selected line (“Param” 1415). 02,)?0$6. To access the secondary menu for modifying mask settings. 7UXH?LI For choosing this mask-test condition. RI To select channel or trace for testing (four-channel menu shown). DUH For ch

40、oosing this mask-test condition. PDVN To select mask trace “A”, “B”, “C” or “D”. 1RWH?Pass/Fail testing against a mask is affected by horizontal and vertical zooming of the mask trace. The test will be made inside the area bordered by the parameter cursors. Timebases of the mask and the trace under

41、test should be identical. For visual mask testing, a single-grid display should be used when performing a single-trace mask test, while a dual- grid display should be used for a dual-trace test. ? &856256?0($685(?3DUDPHWHUV 02,)?0$6.?:IRUP?*HQHUDWLQJ?D?0DVN?IURP?D?:DYHIRUP? IURP To select “Wform”. L

42、QWR For selecting “D=M4” if the mask is to be automatically displayed on the screen Otherwise select “M1”, “M2”, “M3”, or “M4”. Using “RECALL WFORM” (see previous chapter) memories M1 M4 can be recalled to traces A to D for display. ,19(57?0$6. To generate an inverted mask. 8VH?:?IRUP For selecting

43、the waveform to be used as reference. The mask will be generated around this waveform (four-channel menu shown). 0$.(?0$6. To generate the mask. GHOWD?9 For selecting tolerance in amplitude, using the attributed knob. GHOWD?7 For selecting tolerance in time, using the attributed menu knob. ? 02,)?0$

44、6.?(FLOPPY DISK OR OPTIONAL STORAGE DEVICE) IURP To select the device. LQWR For selecting “D=M4” to automatically display the mask on- screen, or “M1”, “M2”, “M3” or “M4”. ,19(57?0$6. For generating an inverted mask. 2?5(&$/ To recall the mask. )LOH To select the appropriate mask, using the associat

45、ed menu knob. ? &856256?0($685(?3DUDPHWHUV &+$1*(?7(67?$FWLRQ?6HWWLQJ?3$66?)$,/?$FWLRQV? Depending on the test result certain actions can be taken. 2Q?OLQH For selecting “Action”. (/(7(?$/?$&7,216 To delete all previously selected actions. ,I To determine if the action will be taken on “PASS” or “FAIL”. 7KHQ For selecting the action (“Dump” in this example). The selected action will then be activated in the menu below. XPS To perform (“Yes”) or disable (“No”) the action chosen in the “Then” menu (see above). The choice will then be indicated alongside the already selected action in “Then”.