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Text File | 1987-01-21 | 40KB | 533 lines

10 ! DATA FILE "8970D", S.HAIMOV & I.ANGELOV, October 1986 ! 20 ! ! 30 ! DESCRIPTION OF PROGRAM "8970A" ! 40 ! ! 50 ! ! 60 ! INTRODUCTION ! 70 ! ! 80 ! Program "8970A" is intended to measure the gain and noise ! 90 ! figure (and/or noise temperature) of microwave devices such as ! 100 ! amplifiers, mixers and receivers. ! 110 ! This program version (V.2.0) uses HP8970A Noise ! 120 ! Figure Meter (NFM) and HP8350A Sweep Oscillator (or HP8672A ! 130 ! Synthesized Signal Generator). The frequency range for noise ! 140 ! measurement is from 10 MHz to 60 GHz with an external sweep ! 150 ! oscillator and from 10 to 1500 MHz for the IF frequencies. ! 160 ! (ATTENTION! The frequency range is from 2GHz to 40GHz when the ! 170 ! HP8350A Sweep Osillator is used) ! 180 ! The "8970A" program is executable on the HP9845 Desktop ! 190 ! computer with the following configuration: ! 200 ! * HP9845 B/C Desktop computer with minimum 32K RAM; ! 210 ! * I/O ROM Option 312; ! 220 ! * Graphic ROM Option 311; ! 230 ! * 98034 HP-IB Interface (IEEE 488, 1978). ! 240 ! ! 250 ! A description of the measurement procedure is given in ! 260 ! our paper named "Computer-Aided Microwave Noise Measurement", ! 270 ! pubblished in the July,1986 issue of the MICROWAVE JOURNAL. ! 280 ! ! 290 ! ! 300 ! DUPLICATE DISK ! 310 ! ! 320 ! Make a duplicate of the master disk(or cartridge) and use ! 330 ! the duplicate disk(or cartridge) as working unit. ! 340 ! Note that "8970A" is recorded on a mass storage unit using ! 350 ! the SAVE statement in order to transport the program between ! 360 ! computers with different configurations. If the faster program ! 370 ! loading provided by recording the program in PROG format is ! 380 ! desired you may GET "8970A <mass storage unit specifier>" and ! 390 ! STORE "8970A<mass storage unit specifier>" on the working mass ! 400 ! storage unit. ! 410 ! ! 420 ! ! 430 ! PROGRAM OPERATION ! 440 ! ! 450 ! 1. Load Program. ! 460 ! ! 470 ! Load and execute the "8970A" program as follows: ! 480 ! a. Install disk(or tape cartridge). ! 490 ! b. GET "8970A <mass storage unit specifier>" EXECUTE ! 500 ! c. When the program is loaded, press RUN . ! 510 ! <mass storage unit spec.>= |:T15 or :T14 for Tape Cartridge ! 520 ! |:F<select code> for HP9885M Flex.Disk! 530 ! |:H<select code> for HP9895A Flex.Disk! 540 ! The program outputs prompts and operator instructions to the! 550 ! display. Respond by typing upper and lower (only for title label)! 560 ! case characters and numbers, then press CONT, or by performing ! 570 ! the indicated operation and then pressing CONT. ! 580 ! ! 590 ! ! 600 ! 2. Operating considerations. ! 610 ! ! 620 ! * Once the program has started, do not press RUN or STOP ! 630 ! then CONT unless your intention is to restart the program from ! 640 ! the beginning. When RUN or STOP then CONT is pressed,all calibra-! 650 ! tion and measerement data is reinitialized. If it is necessery to! 660 ! interrupt program operation to use the desktop computer for ! 670 ! another purpose, the current calibration data can be saved by ! 680 ! recording memory using an initialized cartridge(disk) as follows:! 690 ! With the program prompt "[L]IST DATA,[P]LOT,[N]EXT ! 700 ! MEASUREMENT,[S]TOP THE PROGRAM ?" displayed, press STOP, then ! 710 ! enter: STORE ALL "<file specifier>" EXECUTE ! 720 ! This saves the current state of memory on an initialized unit. ! 730 ! To restore memory, enter: LOAD ALL "<file specifier>" EXECUTE ! 740 ! <file specifier> - file name and mass storage unit specifier ! 750 ! When memory is loaded, enter: CONT List EXECUTE , the program ! 760 ! will resume operation at the "[L]IST DATA,[P]LOT,[N]EXT ! 770 ! MEASUREMENT, [S]TOP THE PROGRAM ?" prompt. Enter the response, ! 780 ! then press CONT. ! 790 ! ! 800 ! * If program operation is inadvertently stopped during the ! 810 ! calibration sequence, restart the program from the beginning by ! 820 ! pressing RUN. If program operation is interrupted during the ! 830 ! measurement sequence, the program can be restarted without losing! 840 ! calibration data by entering: ! 850 ! CONT List EXECUTE ! 860 ! ! 870 ! * Each time the system prompts the operator to make a device! 880 ! connection you may verify the connection by observing the trace. ! 890 ! ! 900 ! * The permitted responses for INPUT statements are given in ! 910 ! prompts with square brackets or/and in inverse video. The default! 920 ! values are explicitly given (for instance: Default 25) or only in! 930 ! blinking mode and underlined. ! 940 ! ! 950 ! * Responses YES and NO are entered in brief form with the ! 960 ! first uppercase letter: Y and N. For convenience the default ! 970 ! response is not obligatory. Example: When the following prompt ! 980 ! DO YOU WANT A HARD COPY [Y/N]? ! 990 ! appears you may enter Y to make a hard copy or press CONT,enter N! 1000 ! or an arbitrary string different from Y to ignore the hard copy. ! 1010 ! ! 1020 ! * There is no check for the type of data (digits or string) ! 1030 ! and if you confuse the response a system error may occur. In this! 1040 ! case, if calibration has not yet started and finished the program! 1050 ! has to be restarted but if the calibration is over, enter ! 1060 ! CONT List EXECUTE . ! 1070 ! ! 1080 ! * The maximum number of the test frequencies is 100. ! 1090 ! This value is changed on line number 90(DIM statement). ! 1100 ! The device addresses and interface select code are given on line ! 1110 ! numbers 150 to 200. If other addresses are used the respective ! 1120 ! line is to be replaced. ! 1130 ! ! 1140 ! * When the same prompt occurs more than once in the process ! 1150 ! of entering input data, it means that the entered data are wrong.! 1160 ! In order to find the correct entry refer to the "3. Program ! 1170 ! prompts." section in this instruction. ! 1180 ! ! 1190 ! * When several values have to be entered in one prompt they ! 1200 ! are separeted with commas. Other delimiters such as space, slash,! 1210 ! etc.are not allowed. ! 1220 ! ! 1230 ! ! 1240 ! 3. Program prompts. ! 1250 ! ! 1260 ! M A I N P R O G R A M ! 1270 ! ! 1280 ! * Initial data ! 1290 ! ! 1300 ! ENTER THE DATE (Format:99/99/99, Default: No Date)? 1310 ! ! 1320 ! Press CONT if you don't wish the Date. Enter the current Date ! 1330 ! with recommended format or with not more than 18 characters ! 1340 ! (Example: September 25, 1986). ! 1350 ! ! 1360 ! ENTER AMBIENT TEMPERATURE (degrees Celsius,Default 25)? 1370 ! ! 1380 ! Press CONT if you want to use the default value 25deg. The range ! 1390 ! of permitted temperatures is from 5 to 40 degrees. ! 1400 ! ! 1410 ! * External LO Programs for HP8350A and HP8672A ! 1420 ! ! 1430 ! ENTER THE OSCILLATOR: 8350(2-40GHz),8672(2-18GHz)? 1440 ! ! 1450 ! Press CONT if you want to use HP8350A. It is the same as if you ! 1460 ! enter 8350 OR 1. Enter 8672 or 2 if you want to use HP8672A. ! 1470 ! ! 1480 ! * Measurement Device Selection ! 1490 ! ! 1500 ! WHAT ARE YOU GOING TO MEASURE([A]mplifier,[M]ixer,[R]eceiver)? 1510 ! ! 1520 ! Press CONT or enter A for amplifier. Enter M for mixer or enter ! 1530 ! R for receiver. ! 1540 ! ! 1550 ! . Amplifier ! 1560 ! ! 1570 ! WHAT KIND OF AMPLIFIER: Fix.[IF](Mode 1.0 or 1.1) , [V]ar.IF(Mode 1580 ! 1.2)? 1590 ! ! 1600 ! Press CONT or enter IF for mode 1.0 or 1.1 of the NFM. Enter V ! 1610 ! for mode 1.2 of the NFM. ! 1620 ! If you enter V the following prompt occurs: ! 1630 ! ! 1640 ! SELECT SINGLE SIDEBAND OFFSET(LSB or USB): Fix.[LO-]IF , 1650 ! Fix.[LO+]IF ? 1660 ! ! 1670 ! Press CONT or enter LO- for Lower Single Sideband frequency ! 1680 ! offset of the NFM (measurement frequency less than LO frequency).! 1690 ! Enter LO+ for Upper Single Sideband frequency offset of the NFM ! 1700 ! (measurement frequency greater than LO frequency) ! 1710 ! ! 1720 ! . Amplifier with LO-IF or LO+IF ! 1730 ! ! 1740 ! ENTER: Start FREQ., Stop freq., Step size, LO freq.(All in MHz)? 1750 ! ! 1760 ! Enter the first test frequency(Start), last test frequency(Stop),! 1770 ! frequency interval(Step) and LO frequency in MHz with the ! 1780 ! following conditons: ! 1790 ! ~ Start freq. <= Stop freq. ! 1800 ! ~ Step size <= Stop freq.-Start freq. ! 1810 ! ~ Stop freq.-Start freq. <= 1500 MHz ! 1820 ! ~ Step size > 0 MHz ! 1830 ! ~ 2000 MHz =< LO freq. <= 60000 MHz ! 1840 ! NOTE that there is no check for the max. LO freq. permitted! 1850 ! by the external local oscillator. ! 1860 ! ! 1870 ! . Amplifier with Fix. IF ! 1880 ! ! 1890 ! ENTER:Start freq.,Stop freq.,Step size,IF freq.(All in MHz)? 1900 ! ! 1910 ! Enter the first test frequency(Start), last test frequency(Stop),! 1920 ! frequency interval(Step) and IF frequency in MHz with the ! 1930 ! following conditions: ! 1940 ! ~ Start freq. <= Stop freq. ! 1950 ! ~ Step size <= Stop freq. - Start freq ! 1960 ! ~ Step size > 0 MHZ ! 1970 ! ~ Start freq >= 10 MHz ! 1980 ! ~ Stop freq. <= 60000 MHz ! 1990 ! ~ Start to Stop frequency range mustn't include the 1500 MHz! 2000 ! to 2000 MHz frequency range ! 2010 ! ~ IF freq.=10MHz to 1500MHz (only when Start freq.>=2000MHz)! 2020 ! NOTE that there is no check for the max. test frequency ! 2030 ! permitted by the external local oscillator. ! 2040 ! ! 2050 ! . Mixer ! 2060 ! ! 2070 ! ENTER: IF_freq.(Default 150MHz)? 2080 ! Press CONT to enter 150MHz for IF frequency or enter IF frequency! 2090 ! value.The range of permitted IF frequencies is from 10 to 1500MHz! 2100 ! ! 2110 ! . Receiver ! 2120 ! ! 2130 ! ENTER: Start IF_freq.,Stop IF_freq.,Step size (All in MHz)? 2140 ! ! 2150 ! Enter the first IF freq.(Start), last IF freq.(Stop) and the IF ! 2160 ! frequency interval(Step) in MHz with the following conditions: ! 2170 ! ~ Start IF freq. >= 10 MHz ! 2180 ! ~ Stop IF freq. <= 1500 MHz ! 2190 ! ~ Stop IF freq. > Start IF freq. ! 2200 ! ~ Step size > 0 MHz ! 2210 ! ~ Step size <= Stop freq. - Start freq. ! 2220 ! ! 2230 ! * Transfer control, Loss compensation, LO Output power ! 2240 ! ! 2250 ! CHANGE: Trans.control,Loss comp.,Freq.range,LO power or Smooth. 2260 ! factor [Y/N]? 2270 ! ! 2280 ! This prompt does not appear when the program is executed for the ! 2290 ! first time or after RUN command. ! 2300 ! Press CONT if you want to measure with previous data. Enter Y if ! 2310 ! you want to change the response even for one of the following ! 2320 ! prompts: ! 2330 ! ! 2340 ! Transfer control of LO [Y/N]? 2350 ! LOSS COMPENSATION:[N]o,[F]ix.,[V]ar.,[M]easured Var.? 2360 ! ENTER: Start LO_freq.,Stop LO_freq.,Step size(All in MHz)?(MIXER) 2370 ! Do you want to reduce frequency range [Y/N]? (for AMPLIFIER) 2380 ! Do you want to reduce IF frequency range [Y/N]? (for RECEIVER) 2390 ! Local Oscillator OUTPUT POWER (6dBm,8dBm,10dBm)? (for HP8672A) 2400 ! Do you want new Smoothing factor [Y/N]? 2410 ! ! 2420 ! Some of the above prompts are explained later in this section.! 2430 ! ! 2440 ! Transfer control of LO [Y/N]? 2450 ! ! 2460 ! Enter Y if you want to transfer control from computer to NFM. ! 2470 ! This mode is usefull when the operator want to check some- ! 2480 ! thing or to make local measurement with NFM. ! 2490 ! ! 2500 ! ENTER: Start LO_freq.,Stop LO_freq.,Step size(All in MHz)? 2510 ! ! 2520 ! This prompt occurs only for measurement of mixers. ! 2530 ! Enter first LO frequency(Start), last LO frequency(Stop) and ! 2540 ! frequency interval(Step) in MHz with the following conditions: ! 2550 ! ~ Start freq. >= 10 MHz ! 2560 ! ~ Stop freq. > Start freq. ! 2570 ! ~ Step size <= Stop freq. - Start freq. ! 2580 ! ~ Step size > 0 MHz ! 2590 ! ~ Stop freq. <= 60000 MHz ! 2600 ! ~ Start to Stop frequency range mustn't include the 1500 to ! 2610 ! 2000 MHz frequency range ! 2620 ! NOTE that there is no check for the max.LO freq. permitted ! 2630 ! by the external local oscillator. ! 2640 ! ! 2650 ! ENTER: Local Oscillator OUTPUT POWER (6dBm,8dBm,10dBm)? 2660 ! ! 2670 ! Only when the Local Oscillator is HP8672A this prompt occurs. ! 2680 ! Press CONT to enter default value 10dBm. Enter 6 or 8 for 6dBm ! 2690 ! or 8dBm. ! 2700 ! ! 2710 ! * Measures and Prints DUT Data ! 2720 ! ! 2730 ! ENTER LABEL ? ! 2740 ! ! 2750 ! Connect the device and press CONT to start the measurement. Label! 2760 ! information of Tables and Graphics will not be printed. ! 2770 ! Connect the device and enter label(not more than 55 char.) to ! 2780 ! start the measurement. Label information will be printed on top ! 2790 ! of the Tables and Graphics. ! 2800 ! ! 2810 ! [L]IST DATA, [P]LOT, [N]EXT MEASUREMENT,[S]TOP THE PROGRAM ? 2820 ! ! 2830 ! Press CONT or enter L to list the data. Enter P to draw the ! 2840 ! noise and gain graphics. Enter N for next measurement whitout ! 2850 ! new calibration. Enter S or press CONT to terminate the program. ! 2860 ! ! 2870 ! ! 2880 ! S U B R O U T I N E S ! 2890 ! ! 2900 ! * ENTER SMOOTHING FACTOR TO HP8970A ! 2910 ! ! 2920 ! ENTER:Smoothing factor(in power of two, Min=1,Max=64,Default 8)? 2930 ! ! 2940 ! Press CONT to enter the default value 8 or enter one of these ! 2950 ! values: 1, 2, 4, 8, 16, 32, 64. ! 2960 ! ! 2970 ! * ENTER OR MEASUREMENT LOSS COMPENSATION ! 2980 ! ! 2990 ! LOSS COMPENSATION:[N]o,[F]ix.,[V]ar.,[M]easured Var.(Default..)? 3000 ! ! 3010 ! Enter N to ignore the losses. Enter F to get the fixed losses at ! 3020 ! the ambient temperature. Enter V (only for amplifiers) to measure! 3030 ! varying losses and use them to measure the amplifier. ! 3040 ! Enter M when you want to use already measured varying losses. ! 3050 ! Default response (..) is current and saves the previous ! 3060 ! response. When you start the program from the beginning the ! 3070 ! default response is N. ! 3080 ! ! 3090 ! You have entered V. Now this prompt appears: ! 3100 ! ! 3110 ! [M]anual entry or Measurement with [N]oise Figure Meter? 3120 ! ! 3130 ! Enter N to measure varying losses with NFM by following the ! 3140 ! display instructions. Enter M for manual entry of the losses in ! 3150 ! the input and output cables. In this mode you may enter the ! 3160 ! corresponding losses for every desirable test frequency. ! 3170 ! Example: ! 3180 ! INPUT CABLE ! 3190 ! Frequency = 2000 MHz ! 3200 ! Loss compensation (Default 0 dB)? ! 3210 ! 0.4 (you enter) ! 3220 ! All entered losses are printed on the display and the following ! 3230 ! prompt occurs: ! 3240 ! ! 3250 ! Loss values OK [Y/N]? 3260 ! ! 3270 ! If you enter N you may change loss values by following the ! 3280 ! display instructions. ! 3290 ! ! 3300 ! You have entered F. Now two prompts appear. ! 3310 ! ! 3320 ! One or two pairs of cables [1,2]? 3330 ! ! 3340 ! This prompt doesn't occur if you measure a receiver. ! 3350 ! Press CONT or enter 1 if you want to use one pair of cables. ! 3360 ! One pair of cables is used for the measurment of the DUT at the ! 3370 ! ambient temperature. Enter 2 if you want to use two pairs of ! 3380 ! cables. Two pairs of cables are used for the measurement of the ! 3390 ! DUT at the cryogenic temperature. The first pair has to be at ! 3400 ! the cryogenic temperature and the second pair - at the ambient ! 3410 ! temperature. ! 3420 ! ! 3430 ! LOSS COMPENS. before DUT(Default..dB) and after DUT(Default..dB)? 3440 ! ! 3450 ! This prompt appears twice if your response to the previous prompt! 3460 ! was 2 (pairs of cables). ! 3470 ! Default values (..) are current and save the last entered loss ! 3480 ! commpensation values. ! 3490 ! Press CONT for default values or enter new values. ! 3500 ! ! 3510 ! LOSS TEMPERATURE ( Default ..)? 3520 ! ! 3530 ! Enter the temperature of the measurement in degrees Celsius. ! 3540 ! The Default value (..) is the ambient temperature. ! 3550 ! ! 3560 ! * MEASURE/STORE AMPLIFIER or MIXER DATA and VARYING LOSSES ! 3570 ! ! 3580 ! The following prompts occur if you measure an amplifier. ! 3590 ! ! 3600 ! Do you want to reduce frequency range [Y/N]? 3610 ! ! 3620 ! Enter Y if you want to measure in a reduced frequency range ! 3630 ! releted to the calibrated frequency range and the next prompt ! 3640 ! occurs: ! 3650 ! ! 3660 ! ENTER: Start freq.,Stop freq.,Step size(All in MHz)? 3670 ! ! 3680 ! Enter reduced values with the following conditions: ! 3690 ! ~ Start freq. >= Calibrated Start freq. ! 3700 ! ~ Stop freq. <= Calibrated Stop freq. ! 3710 ! ~ Step size > 0 MHz ! 3720 ! ~ Step size <= Stop freq. - Start freq. ! 3730 ! ~ Start freq. <= Stop freq. ! 3740 ! ! 3750 ! Do you want new Smoothing factor [Y/N]? 3760 ! ! 3770 ! Enter Y if you want to change the smoothing factor of the data ! 3780 ! measured. ! 3790 ! ! 3800 ! * MEASURE/STORE RECEIVER DATA ! 3810 ! ! 3820 ! ENTER:Start LO_freq.,Stop LO freq.,Step size(All in MHz)? 3830 ! ! 3840 ! This prompt appears only once when you measure a receiver for ! 3850 ! the first time. ! 3860 ! Enter first LO frequency(Start), last LO frequency(Stop) and ! 3870 ! frequency interval(Step) in MHz with the following conditions: ! 3880 ! ~ Start freq. >= 10 MHz ! 3890 ! ~ Stop freq. > Start freq. ! 3900 ! ~ Step size <= Stop freq. - Start freq. ! 3910 ! ~ Step size > 0 MHz ! 3920 ! ~ Stop freq. <= 60000 MHz ! 3930 ! ~ Start to Stop frequency range mustn't include the 1500 to ! 3940 ! 2000 MHz frequency range ! 3950 ! NOTE that there is no check for the max.LO freq. permitted ! 3960 ! by the external local oscillator. ! 3970 ! ! 3980 ! Do you want to reduce IF frequency range [Y/N]? 3990 ! ! 4000 ! Enter Y if you want to measure in a reduced frequency range ! 4010 ! releted to the calibrated frequency range and the next prompt ! 4020 ! occurs: ! 4030 ! ! 4040 ! ENTER: Start IF_freq.,Stop IF_freq.,Step size(All in MHz)? 4050 ! ! 4060 ! Enter reduced values with the following conditions: ! 4070 ! ~ Start IF freq. >= Calibrated Start freq. ! 4080 ! ~ Stop IF freq. <= Calibrated Stop freq. ! 4090 ! ~ Step size > 0 MHz ! 4100 ! ~ Step size <= Stop IF freq. - Start IF freq. ! 4110 ! ~ Start IF freq. <= Stop IF freq. ! 4120 ! ! 4130 ! Do you want new Smoothing factor [Y/N]? 4140 ! ! 4150 ! Enter Y if you want to change smoothing factor of the data. ! 4160 ! ! 4170 ! * PRINTS/DRAWS DUT ! 4180 ! ! 4190 ! DO YOU WANT A HARD COPY [Y/N]? 4200 ! ! 4210 ! Enter Y to output data to the line printer. ! 4220 ! ! 4230 ! * DRAW GAIN and NOISE FIGURE GRAPHICS ! 4240 ! ! 4250 ! ! 4260 ! LO_frequency=... 4270 ! DO YOU WANT GRAPHICS FOR THIS FREQUENCY [Y/N]? 4280 ! ! 4290 ! This prompt occurs only when the receiver data are drawn. ! 4300 ! Enter Y if you want to draw graphics for the given LO frequency. ! 4310 ! ! 4320 ! DO YOU WANT TO CHANGE DIMENSIONS [Y/N]? 4330 ! ! 4340 ! When you have measured a receiver in more than one LO frequency ! 4350 ! this prompt occurs. ! 4360 ! If you enter Y you may change the dimensions of the graphics in ! 4370 ! the way given bellow. ! 4380 ! The next prompts appear for amplifiers and mixers as well. ! 4390 ! ! 4400 ! Noise [F]igure or Noise [T]emperature? 4410 ! ! 4420 ! Press CONT or enter F if you want to draw gain and noise figure ! 4430 ! of the DUT. Enter T to draw gain and noise temperature of the DUT! 4440 ! ! 4450 ! Noise Figure:BOTTOM SCALE,TOP SCALE(in dB, Default 0,8)? 4460 ! ! 4470 ! Enter the bottom scale value and the top scale value in dB for ! 4480 ! the data to be plotted.Press CONT if you want scale from 0 to 8dB! 4490 ! ! 4500 ! Noise Temperature:BOTTOM SCALE,TOP SCALE(in degrees Kelvin, 4510 ! Default 0,400)? 4520 ! ! 4530 ! Enter the bottom scale value and the top scale value in degrees ! 4540 ! Kelvin for the data to be plotted. Press CONT if you want scale ! 4550 ! from 0 to 400K. ! 4560 ! ! 4570 ! Gain:BOTTOM SCALE,TOP SCALE(in dB, Default 0,40)? 4580 ! ! 4590 ! Enter the bottom scale value and the top scale value in dB for ! 4600 ! the data to be plotted.Press CONT if you want scale from 0 to 40.! 4610 ! ! 4620 ! DUMP GRAPHICS [Y/N]? 4630 ! ! 4640 ! Enter Y to output the plot shown on the CRT to the line printer. ! 4650 ! Press CONT or enter N to skip the hardcopy plot output. ! 4660 ! ! 4670 ! LETTER MODE [Y/N]? 4680 ! ! 4690 ! Enter Y if you want to write some text in the graphic area. Press! 4700 ! CONT to ignore this mode. ! 4710 ! ! 4720 ! DO YOU WANT THE PLOTTER HARD COPY [Y/N]? 4730 ! ! 4740 ! Enter Y to output the plot shown on the CRT to the plotter. ! 4750 ! ! 4760 ! ! 4770 ! 4. Variable list. ! 4780 ! ! 4790 ! A$ - input string variable for the mode of the amplifier ! 4800 ! measurement; A$=(IF,V,LO-,LO+,LO) ! 4810 ! Alo - LO HP-IB address; Alo=19 ! 4820 ! Anf - HP8970A HP-IB address; Anf=8 ! 4830 ! Bg - input variable; bottom scale for the gain graphic ! 4840 ! Bn - input variable; bottom scale for the noise graphic ! 4850 ! C - various uses ! 4860 ! Change$ - input string for change of the parameters of measurem. ! 4870 ! D - various uses ! 4880 ! Date$ - input string containing the date ! 4890 ! Dummy - dummy device address; Dummy=7 ! 4900 ! E - output variable; error of the measurement ! 4910 ! F - current test frequency ! 4920 ! F1 - input variable; start frequency ! 4930 ! F2 - input variable; stop frequency ! 4940 ! F3 - input variable; frequency interval ! 4950 ! F4 - input variable; LO freq. or IF freq. depending on ! 4960 ! measurement mode; start LO freq. only for receiver ! 4970 ! F5 - input variable; smoothing factor ! 4980 ! F6 - input variable; stop LO freq. only for receiver ! 4990 ! F7 - input variable; frequency interval only for receiver ! 5000 ! Ff - frequency range (F2-F1) ! 5010 ! Fr - current LO freq. only for receiver ! 5020 ! Fr1 - start calibration frequency ! 5030 ! Fr2 - stop calibration frequency ! 5040 ! Fr3 - frequency calibration interval ! 5050 ! Hard - input variable; hardcopy variable for the data table ! 5060 ! Hard=0-prints on the CRT; Hard=1-prints on int.printer ! 5070 ! J - various uses ! 5080 ! Key - control variable in varying losses measurement mode ! 5090 ! Kind$ - input variable; type of the DUT; Kind$=(A,M,R) ! 5100 ! L$ - various uses ! 5110 ! Lc1 - input/output variable;loss comp. before DUT(first pair)! 5120 ! Lc2 - input/output variable;loss comp. after DUT(first pair) ! 5130 ! Lc3(*) - input/output array;freq.depending losses (input cable) ! 5140 ! Lc4(*) - input/output array;freq.depending losses (output cable)! 5150 ! Lc5 - input/output variable;loss comp.before DUT(second pair)! 5160 ! Lc6 - input/output variable;loss comp. after DUT(second pair)! 5170 ! Lo - input variable for the type of LO;Lo=1-HP8350,2-HP8672 ! 5180 ! Loss$ - input string for the type of the loss compensation ! 5190 ! N(*) - two dimensions output array with data of measurement ! 5200 ! Ncab - number of cables used ! 5210 ! Num - number of test frequencies ! 5220 ! Nt - index for the second dimension of the N(*) ! 5230 ! Plotad - HP9872A HP-IB address; Plotad=5 ! 5240 ! Plotter - type of the plotter;Plotter=13-CRT,9872-HP9872A ! 5250 ! Plotter$- plotter identifier string expression ! 5260 ! Sel - interface select code; Sel=7 ! 5270 ! T$ - various use;usually for Y/N responses ! 5280 ! Tec - ambient temperature ! 5290 ! Title$ - string for output messages ! 5300 ! T_loss - loss temperature ! 5310 ! Tg - top scale for gain graphic ! 5320 ! Tn - top scale for noise graphic !