BOONTON 44-4500A Instruction 电路图.pdf

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1、INSTRUCTION MANUAL RF PEAK POWER METER ANALYZER RF PEAK POWER METER ?%221721?(/( the element 500 lies on the right-most gridline and element 250 lies on the center gridline. Data Buffer Output. Data can be output for Channel 1, Channel 2, Channel Math, Reference 1 or Reference 2. The data is adjuste

2、d for Vertical Offset, calibration factors and averaging. If the display Units are set to “Linear”, power will be in watts with 5 decimal digits of resolution. The real number format is: (-d.ddddE!dd , -dd.dddE!dd or ddd.ddE!dd where the positive sign is omitted and the exponent is mod 3) watts. Neg

3、ative power values indicate underflow of the system “zero”. If the display units are set to “Log”, power will be in dBm (decibels relative to 1 milliwatt) with a resolution of !0.01 dB. Negative linear power values will return 70.00 dBm excluding offsets if not clipped. In the Pulse mode with Log un

4、its a clip level is applied which establishes a minimum power level based on the sensor calibration data. This level will vary depending upon the sensor type and offsets. For Channel 1 or 2 in the Trigger View mode the data will be returned in volts with a resolution of !0.01 volts. GPIB Data Buffer

5、 Output. Data buffer contents can be read over the GPIB using the TKFPDISP talk mode command. This is a permanent talk mode that remains in effect until replaced by a different permanent talk mode. TKFPDISP should be followed by an index argument in the range 0 to 500 inclusive that specifies the nu

6、mber of the first element of the data 98404704A 2 buffer to be sent. The total number of elements requested is specified by the BUFCOUNT command. BUFCOUNT is followed by an argument in the range 1 to 501 inclusive. After the TKFPDISP command and argument are sent, the first time the 4400A/4500A is a

7、ddressed to talk (MTA is sent), a string of comma delimited elements will be returned beginning with the index value followed by BUFCOUNT measurement values as described above. Each successive time the power meter is addressed to talk the index value will be automatically advanced by BUFCOUNT number

8、 of elements and a new string returned. If the incremented pointers reach beyond the last element in the buffer the string is truncated and fewer than BUFCOUNT values are returned. At least one index and one element is always returned. Example: BUFCOUNT 10 TKFPDISP 0 MTA Returns 0, p0, p1, p2, p3, p

9、4 p9 MTA Returns 10, p10, p11, p12, p13 p19 Example: BUFCOUNT 501 TKFPDISP 0 MTA Returns 0, p0, p1, p2 .p500 (entire buffer) MTA Returns 500, p500 (truncated to one element) Example: BUFCOUNT 5 TKFPDISP 496 MTA Returns 496, p496, p497, p498, p499, p500 The source buffer is selected using the CH1, CH

10、2, CHM, REF1 and REF2 commands. The units are selected using LIN or LOG. TKFPDISP does not interrupt sampling and data collection while sending data. For this reason buffer data will not remain stable during a transfer. If this behavior is undesirable, issue the STOP command to stop data capture whe

11、n appropriate. Front Panel Data Buffer Output. Front panel data buffer output is controlled by the PrgmTrace Data menu. An entire data buffer can be sent to a Floppy Disk file, the COM1 serial port or the LPT1 line printer. No index value is used. The delimiter separating data elements can be select

12、ed to be a comma, LF (line-feed or NL), CR (carriage return) or ASCII space. This is useful if the data file is to imported directly into a spreadsheet. PrgmTrace DataSelect A number, nn, 0 to 99 which specifies the filename B4500Ann.TXT. Applies only to Disk output. PrgmTrace DataSource Select the

13、data buffer: CH1, CH2, CH Math, Ref1, Ref2 98404704A 3 PrgmTrace DataDestination Select the output device: LPT1, COM1 Disk PrgmTrace DataDelimiter Select the data element delimiter: comma, LF, CR, Space PrgmTrace DataSend Data Press to START data transfer from buffer to device. GPIB Control of Front

14、 Panel Output Controls. In addition to the direct GPIB output via the TKFPDISP and BUFCOUNT commands, the alternate device outputs can also be controlled over the bus. The specific commands are given below. FILENO Sets the filename B4500Ann.TXT for Disk output where nn is the argument of FILENO. Val

15、id range is 0 to 99. BUFDELCO Set buffer delimiter to comma. BUFDELLF Set buffer delimiter to linefeed (NL) BUFDELCR Set buffer delimiter to carriage return BUFDELSP Set buffer delimiter to space. Note: The delimiters do not apply to data returned using TKFPDISP. They apply only to output using DATA

16、SEND. DATACOM1 Select COM1 serial port output. DATADISK Select the floppy disk output with filename selected with FILENO DATALPT1 Select the printer port LPT1 for output. Delimiter will affect printed format. DATASOCH1 Select the Channel 1 buffer. DATASOCH2 Select the Channel 2 buffer. DATASOCHM Sel

17、ect the Channel Math buffer. DATASORF1 Select the Reference 1 buffer. DATASORF2 Select the Reference 2 buffer. Note: These source selections do not apply to data returned by TKFPDISP. They apply only to output using DATASEND. DATASEND Action command which causes the data buffer to be sent to the sel

18、ected output. Unlike output to the GPIB data capture is interrupted during transfers to output ports and the disk. 98404704A 4 1.2 Statistical Data Output Capability The following data output capability is applicable only to the Model 4500A. 4500A Statistical Histogram GPIB Output. The 4500A statist

19、ical histogram count array accumulated by running a CDF, 1-CDF or PDF function is output in two arrays of 4096 values each. 1. The X-axis array consists of up to 4096 power values in watts or dBm as described above. The bus commands LIN and LOG are used to set the units. The Channel 1 array is selec

20、ted by the command SELDATTBL 6 and the Channel 2 array by SELDATTBL 7. The array is returned by the talk mode command TK-TBLDAT n, where n is the starting index number. The BUFCOUNT command followed by a count argument of 1 to 4096 operates as described above for the TKFPDISP command. 2. The Y-axis

21、array consists of up to 4096 count values. The count value is the number of times the power sample value has fallen within the bin located by the index number. The power in watts or dBm for the center of each bin or index number is given by the X-axis array above. The ratio of each bin count to the

22、total sample count is the probability of occurrence for that bin. The Channel 1 count array is selected by the command SELDATTBL 8 and the Channel 2 count array by SELDATTBL 9. The array is returned by the talk mode command TK-TBLDAT n, where n is the starting index number. The BUFCOUNT command foll

23、owed by a count argument of 1 to 4096 operates as described above for the TKFPDISP command. 4500A Front Panel Histogram Output. Front panel histogram output is controlled by the PrgmTrace Data menu. An entire data buffer can be sent to a Floppy Disk file, the COM1 serial port or the LPT1 line printe

24、r. No index value is used. The delimiter separating data elements can be selected to be a comma, LF (line-feed or NL), CR (carriage return) or ASCII space. This is useful if the data file is to be imported directly into a spreadsheet. For the Model 4500A, additional source choices will appear in the

25、 menu as follows: PrgmTrace DataSource Select the data buffer: CH1, CH2, CH Math, Ref1, Ref2,Cal Tbl 1,Cal Tbl 2,Histogram 1,Histogram2 Cal Tbl 1 and 2 are the x-axis power value arrays and Histogram 1 and 2 are the count arrays for Channel 1 and 2 respectively. All other front panel controls and as

26、sociated GPIB commands operate as described above except that the SELDATTBL n, command is used instead of the data source commands. 98404704A 5 1.3 Screen Saver A screen saver feature has been added to increase CRT phosphor life in system applications. The display will be dimmed after a specified ti

27、me during which there is no front panel control activity. The delay time in minutes is set in the DispScrn Saver Delay menu window. The delay can be varied from 1 to 240 minutes via the front panel keyboard, knob or increment /decrement buttons. To disable the feature select the increment above 240

28、which is “infinite” or enter 241 minutes. The CRT display will then remain bright at all times. The display when dimmed will be restored to full brightness by any front panel key or knob operation. The delay/infinite setting is non-volatile and will be restored after power off/on. There are no relat

29、ed bus commands for this feature. 1.4 New Auto-Measure function, EdgeDly A new auto-measure function, number 15, Edge Delay, has been added to the TEXT display. Edge delay shows the time delay between the left edge of the display window and the first waveform edge of either slope. This allows the di

30、splay window to be used as a mask to select or exclude portions of a waveform. Trigger delay adjusts the position of the display window with respect to the trigger. Edge Delay should be added as item 15 in Table 4-19. It appears as a selection in the Meas Param Meas Param Top Middle and Bottom menus

31、. The GPIB PARAM_ commands will accept the value 15 as an argument and allow Edge Delay to be selected remotely. 1.5 New GPIB Commands Additions to Table 5-3 Mode 4400A/4500A Talk Mode Bus Mnemonics. Code Arg Function TKATEMP - Returns a status flag and the sensor auto-cal temperature for both chann

32、els. For the status flag 0 = valid, 1 = no sensor, 2 = no channel card. The auto-cal temperatures are returned in tenths of a degree Celsius (#.#). After returning data the instrument returns to the previous Talk mode. Format: status1, auto-cal temp1, status2, auto-cal temp2 Examples: send TKATEMP r

33、ead 0, 34.0, 0, 39.0 valid both channels or read 0, 34.0, 1, -23.0 valid ch1; no sensor in ch2 or read 0, 34.0, 2, -23.0 valid ch1; no ch2 installed 98404704A 6 TKEJD - For the currently selected measurement channel returns a status flag and the time delay in seconds between the left edge of the dis

34、play window and the first waveform edge of either slope. Trigger delay can be used to move the window with respect to the trigger to select or exclude portions of a long string of pulses. This command works only with TKAMEAS active. After returning data the instrument returns to the previous Talk mo

35、de, normally TKAMEAS. Examples: send TKAMEAS send only once send TKEJD “send TKEJD read” may be repeated read 1, 1.163e-7 valid edge delay in seconds or read 0, 0 no valid result TKMMODE - Returns a measurement mode run/stop flag, mode identifier and units flag. For the run/stop flag 0 = STOP, 1 = R

36、UN. For the mode identifier 0 = Pulse, 1 = CW, 2 = CDF, 3 = 1-CDF, 4 = PDF. For the units flag 0 = log (dBm) and 1 = linear (watts). After returning data the instrument returns to the previous Talk mode. Examples: send TKMMODE read 1, 0, 0 running in pulse mode with log units or read 0, 3, 1 stopped

37、 in 1-CDF mode with linear units 1.6 EOI Only Talk mode Terminator In the Util IEEE-488 Bus Setup Talk Term menu a new choice, EOI only, has been added. This allows return strings to be terminated only by the EOI signal of the GPIB, simplifying setup with controllers which use this as their default.

38、 1.7 Reference Lines in Linear Units mode Reference Lines and Reference Line Tracking now work in the Linear as well as Logarithmic units modes. Reference line level readout is always in dBm. 2. CORRECTIONS 2.1 Sensor Temperature Readings All previous versions and revisions of Model 4400/4500/4400A

39、and 4500A report sensor temperature approximately 10 degrees Celsius lower than the actual internal sensor temperature. This characteristic has been of little consequence since only delta temperature values are used. 98404704A 7 For future developments it is desirable to use the actual internal sens

40、or temperature. Effective with this revision (20010119) all sensor temperatures are the actual internal temperature. Compatibility with previous software revisions. The effect of this change is expected to be minimal because delta temperature values are not affected. Some GPIB programs may use absol

41、ute sensor temperature values and expect the old style values for correct operation. To accommodate this situation, a new GPIB command OLD_TEMP# has been included in the new revision. To use the old style temperatures, issue the GPIB command OLD-TEMP# in the initialization part of the program. This

42、will cause all sensor temperature values to appear as in earlier revisions. The effect of this command is volatile and it must be re-issued after a power off/on cycle. 2.2 Failure to resume in Statistical mode on power up (4500A only). Some previous software revisions contain a bug that causes stati

43、stical measurements not to resume correctly on power up. This occurs only when the instrument was powered down in one of the statistical modes. Normal operation will resume if the menu selection or a GPIB measure mode command is sent. This revision (20010119) corrects the error and under the above c

44、onditions statistical measurements will resume automatically at power up. 2.3 Inability to use request for service (SRQ) on settled measurement in CW mode with averaging 1. In all previous revisions in CW measurement mode with the SRQ mask set to 2, no service request would be issued unless the Aver

45、aging was set to 1. This bug has been fixed in this revision (20010119). Since CW is a continuous mode it is necessary to stop and start the measurement in order to obtain repeated service requests with settled readings. Stopping the continuous measurement resets the averaging system. After a restar

46、t and after the averaging time has expired, the service request will be issued if the mask for settled measurement (2) is enabled. The serial poll issued by the GPIB controller reads and resets the service request, but not the settled measurement flag. To restore synchronization between the controller and the measurement process, it is necessary to issue the STOP command. When the desired signal is present at the power sensor input, issue the RUN command. When