oper manual dpm
Contents
1. 242. string represents current frequency in GHz and its format must be 000 00 6 chars fixed point with leading and trailing zeroes For example frequency 62 50 GHz represents with string 062 50 gives request byte sequence 30 36 32 2E 35 30 HEX values It has not have terminator like CR LF Any excess byte will cause an error DPM answer depends on units what power level is measured in If measurements are performed in Watt units the answer is ASCII string with current frequency in the same format as in input string 7 th character is separator space 20 Hex value then goes the same string as power displayed in DPM 000 00mW 0 000mW or 000 00uW 0 000uW In other words device response is exactly the displayed string without any terminators 14 chars Chars in pos 4 7 14 are constant and can be used to check if response is correct The first six chairs mean set frequency The rest chairs do power value Decimal point in power value is not fixed 7 E band Power Meter Operational Manual For dBm units the answer is ASCII string with current frequency in the same format as in input string 7 th character is separator space 20 Hex value then goes the same string as power displayed in DPM 00 00dBm or 0 000 dBm In other words device response is exactly the displayed string without any terminators 17 chars Chars in pos 4 7 15 16 17 are constant and can be used to check if respon
3. 1 2 32 10 33 10 34 20 35 25 36 50 37 100 to choose frequency step 4 byte 30 Watt units 31 dBm units to choose measurement mode 5 byte 30 PC control OFF 31 PC control ON to choose control mode manually or automatically 6 byte 30 Squeak OFF 31 Squeak ON to choose alarm squeak mode 9 4 Run softwear Use ICS 4086 data sheet if needful 10 To leave automatic mode and proceed to manual mode press any key 11 Use switch ON OFF if one needs to reset the power meter Note Do not switch the power meter ON OFF if input mm wave power exists at power sensor input E band Power Meter Operational Manual Power Sensors calibration E band power sensor with DPM indicator block were calibrated at ELVA 1 lab with ELVA 1 s reference power meters Calibration setup is shown in fig 16 POWER METER REFERENCE CONTROL UNDER POWER METER PC CALI BRATION POWER SENSOR Directional coupler Calibrated SWEEPING calibrated attenuator OSCILLATOR Fig 16 Power meter calibration setup A sweeping oscillator provides mm wave signal within full operating bandwidth of the power sensors MM wave power was measured with reference power meter and power meter under calibration at the same time The calibration is being done automatically with frequency step 0 2GHz Correction fac
4. E band Power Meter Operational Manual ELVA 1 Microwave Ltd S A Mm wave Division e mail sales elva 1 com Inte met http www elva 1 com Technical Description and User Manual E band CW power meter DPM 12 s n N 1204 21 T E band Power Meter Operational Manual Specifications Operating Frequency Range 60 90GHz Max measured power level 20 mW 13dBm Dynamic range typ 50 dB Frequency set step 1GHz 0 5GHz 0 25GHz 0 2GHz 0 1GHz 0 05GHz 0 02GHz 0 01GHz Measurement time max 0 5 sec Input VSWR 1 4 1 max Interface port RS 232 DB 9 GPIB Power sensor port WR 12 UG 387 U Power supply 110 VAC Software version 2620 110707 PC protocol ELVA and SCPI Ambient air temperature 5 to 40 deg C conditions air humidity Up to 95 E band Power Meter Operational Manual General Description The power meter with E band power sensors further DPM was designed for measurement of CW mm wave power level within 60GHz 90GHz frequency range The following possibilities of operating are provided in DPM measurement of CW power level in Watt or in dBm setting of frequency step control mode operating with PC using RS 232 port or GPIB ports setting of frequency step indication of measured CW power level in Watt or in dBm control mode squeak ON OFF mode through RS 232 or GPIB interface Note To avoid sensor damage do not measure mm wave power more
5. croWatts demo Response string is exactly like string on DPM display source Decimal point in power value is not fixed To set proper terminator mode for DPM GPIB interface card the following driver function call is used Pascal with AX5488 library ibeol GPIB ADDRESS 1 fout_mode 1 oeol1 strlen oeol 1 f in_mode 1 ieol where oeol any string ieol any char with mode 1 they are void For other GPIB card function may differs see manual for your card driver 11 E band Power Meter Operational Manual Power Meter Operating 1 Connect the Control and Display Unit of Power Meter and the Sensor 2 Connect the 110 VAC adapter plug of DPM Control and display unit to a power point Then put AC switch ON Wait for loading the DPM Lines with number of software will appear on the screen Fig 6 Fig 6 Loading DPM screen Then tests of power sensor and software are doing Note The 2620 110707 version supports two protocols for control through PC ELVA normally used with RS 232 interface SCPI with GPIB interface List of SCPI commands is included in the manual below see Appendix 1 Read pages 14 15 and make sure the right protocol has been set for control If the tests have been successfully passed screens as in Fig 7 and in Fig 8 are following Fig 7 Test of power sensor has been done OK E band Power Meter Operational Manual Fig 8 Test of software has been finish
6. ear panel The top line of the display shows the set frequency of mm wave signal entered by keyboard or through RS 232 or GPIB interface the bottom line indicates measured power Refresh rate of measured power is about 2 times per second Ten digital keys 0 9 are to be used for manual input of the frequency key to decrease frequency key to increase it One pressure on the key shifts frequency at set step value Possible frequency values are within 60 90 GHz for E band sensor Input frequency format is XXX XX GHz All 5 figures must be entered E g to set frequency 90 00GHz one enters symbols 0 9 0 0 0 Wrong values will be rounded to one of boundary values Note In case of not valid actual signal frequency setting there is an error of displayed mm wave power because of non flatness of calibration frequency curve Outward appearance of the power meter is shown in fig 4 and 5 Fig 4 Upper Panel of the DPM 12 Power Meter 1 Decreasing frequency key 2 Increasing frequency key E band Power Meter Operational Manual 1 2 3 Fig 5 Rear Panel of the DPM 12 Power Meter 1 GPIB port 2 RS 232 port 3 AC power socket 4 Power sensor connector 5 Fuse 6 Power On Off switch Frequency setting and receiving of measured power value can be realized using interface ports Interface dialog consists of request PC DPM and answer DPM PC data transmission Request ASCII
7. ed and OK Ifsymbol Fa appears in screen as in Fig 9 and alarm squeak sounds it means that connection between DPM and Power Sensor is unreliable Fig 9 Failed sensor tests screen In this case one must switch DPM OFF and disconnect Power Sensor Then connect the Power Sensor properly with using screws on power sensor connector DB 9 and switch the DPM Control and Display unit again If it is necessary one should repeat the operation until the line Program OK Fig 8 appears on screen One can skip tests pressing any key Next screen shows two lines with current settings of the DPM Control and display unit block The settings are the same which was at the moment when the DPM was switched OFF at last session E band Power Meter Operational Manual If it is necessary to set default settings one should keep the key 5 pressed during switching ON and release it after two alarm squeaks Default settings are Fig 10 upper line Tab step 1 W lower line SCPI Fig 10 Screen with default settings of DPM SCPI control format has been set The values mean Tab 1 mode 1 Only this mode is available for this model Step 1 step 10 MHz the smallest step W indication in Watt units uW mW Local SCPI PC control with SCPI protocol The DPM indicator block can be controlled with PC using ELVA or SCPI protocol Check which SCPI or ELVA control protocol has been set I
8. ns freq Setting of frequency of measured XXX XxX signal examples sens freq 91 sens freq 091 sens freq 91 0 sens freq 091 00 sens freq Query of set frequency 91 00 CALC calc aver coun Setting of number of 1 250 measurement points averaging calc aver coun Query of set number of averaging 50 UNIT unit pow dbm Setting of indication of power level in dBm unit pow w Setting of indication of power level in uW mW unit pow Query of type of power W power level in uW mW measurement unit DBM power level in dBm READ read Start of measurements and 0 185 UW measured power receiving data level or 37 3 DBM measured power level fetc Reading of result of last done 0 185 UW measured power measurement without new level or 23 E band Power Meter Operational Manual process of measurement 37 3 DBM measured power level DISP disp enab off Display does not refresh measurement information at REMOTE RS control mode disp enab on Display indicates actual measurement information at REMOTE RS control mode disp enab Display operation status on Display indicates actual data is on off Display does not refresh data is off gtl Setting of manual control Go To Local control Notes DPM display unit with GPIB interface used ICS Electronics 4806 board http www icselect com pdfs 4806_ds pdf ht
9. nt control format or change control format Press any key Insert symbols 992 One of two types of screen appears 21 E band Power Meter Operational Manual __ Current control format SCPI Current control format ELVA Choose a or b below a Press key if current control format satisfies b Press any key except to change format Press key if indicated control format satisfies List of commands of SCPI format 1 Commands SYST2 system Command Description Respond SYST2 syst2 beep stat Turn Buzzer off off Buzzer does not sound is off when a command receives at remote mode syst2 beep stat Turn Buzzer on on Buzzer sounds is on when a command receives at remote mode syst2 beep stat Query of Buzzer status on Buzzer is on off Buzzer is off syst2 pres Default DPM settings Tabl Frq_step 1 10 MHz Indication in uW mW 22 E band Power Meter Operational Manual Manual control syst beep stat off aver count 50 disp enab off syst2 err Query to type of last error 0 No error After the command error bite gets 100 Command error 0 128 Numeric data not allowed 365 Time out error SENS sens corr tabl 1 Set mode Tab1 for sensors with directional coupler only sens corr tabl 2 Set mode Tab2 for sensors with directional coupler only sens corr tabl Query of status Tab 1 Tabl is set 2 Tab2 is set se
10. oosing TAB2 press to leave the mode ATTENTION Only one mode Tab1 Tab2 is provided in this DPM model type 6 Choose control and squeak mode squeak ON or squeak OFF for this 16 E band Power Meter Operational Manual press any key insert 996 code using keyboard press consistently any key except 3 and for choosing manual mode Line Remote Off means manual mode In this mode squeak is always ON press consistently any key except 3 and for choosing control mode through RS 232 or GPIB interface of a PC without squeak Line Remote On means RS 232 or GPIB without squeak mode ON press consistently key 3 for choosing control mode through RS 232 or GPIB interface of a PC with squeak Line Remote On means RS 232 or GPIB interface with squeak mode ON press to leave the mode Sign Remote READY TO START or two lines FREQUENCY POWER appear in LCD sign or in right upper corner of LCD means set automatic mode Fig 15 7 Connect input of the sensor to a source of mm wave CW power 8 In manual mode 8 1 choose frequency step for this press any key insert 998 code using keyboard press consistently any key except for choosing frequency step Example Symbols 50 means frequency step 0 50GHz press to leave the mode 8 2 Set frequency of measured signal in GHz for this press any key to get input fre
11. quency mode Keep the key pressed until underline sign appears Presence of underline sign in LCD means frequency setting mode insert frequency Underline shows what symbol is being set Frequency format is XXX XX GHz All 5 figures must be entered If right frequency value is not determined the absolute value of measured power will be wrong because output signal of power sensor is frequency depended E band Power Meter Operational Manual use key to shift the frequency down and key to shift it up on one step Frequency step is 1GHz 0 5GHz 0 25GHz 0 2GHz 0 1GHz 0 05GHz 0 02GHz 0 01GHz How to set frequency step read in the item 8 1 above 8 3 Frequency value without underline sign in LCD means measuring mode 8 4 Read the value of the measured power in LCD 9 In automatic mode 9 1 Connect PC with DPM RS 232 or GPIB port 9 2 There is a possibility to check current mode of DPM as it written above for this by using software for checking RS 232 or GPIB port send to DPM 6 byte command byte A 41 to choose check mode 2 6byte any meanings 9 3 There is a possibility to set mode of DPM as it written above for this send to DPM 6 through RS 232 or GPIB port byte command 1 byte B 42 to choose set mode 2 byte 31 Mode TAB1 32 Mode TAB2 to choose mode Note Only one mode Tab1 Tab2 is provided in this DPM model Use Tabl 3 byte 30 1 3
12. rol ON to choose control mode G 6 th byte 0 Squeak OFF 1 Squeak ON to choose alarm squeak mode Symbols 0 1 7 corresponds to 30 31 37 in HEX format There is a possibility to read with PC current mode of DPM for this send to DPM block 6 bytes command through RS 232 or GPIB port AXXXXX 1 st byte is A 41 to choose check mode Bytes X from 2 nd to 6 th can have any symbols The reply from DPM is ACDEFG Symbol A as in the request Bites from C to G as above C means Tab 1 or Tab 2 E band Power Meter Operational Manual D means frequency step E means units of measurements Watt or dBm F means PC control ON or OFF Must be ON G means squeak ON or OFF For Example 1 On request A12345 41 31 32 33 34 35 in HEX value DPM reports current settings For example Settings Tab 1 Frequency step 20MHz dBm units PC control ON Squeak ON DPM gives answer string 41 31 31 31 31 31 31 2 On request B10000 42 31 30 30 30 30 in HEX value DPM sets following settings Tab 1 Frequency step 1OMHz Watt units PC control OFF Squeak OFF Serial interface Data format 8 data bits no parity 1 stop bit 8N1 Connection speed 1200 bps Connection cable Really only 3 wires are used case g
13. round recommended for safety The power meter with GPIB interface requires MODEM cable GPIB interface The Serial interface gt GPIB card of ICS Electronics model 4806 tested with GPIB card AX5488 with default jumper settings http www icselect com pdfs 4806_ds pdf http www icselect com Device is configured for proper operation Factory default GPIB address 4 DPM GPIB configuration and operation commands Device is configured for proper operation so the only thing to be changed in it s settings is GPIB address we left factory default 4 E band Power Meter Operational Manual Command strings and responses given in apostrophes to separate them from spaces and comments Really there mustn t be apostrophes GPIB configuration Set new GPIB SYST COMM GPIB ADDR 11 Do not address 11 Address will be changed after 30 mSec delay forget it Set baud rate 1200 SYST COMM SER BAUD 1200 UP update UART Device works only at baud rate 1200 Set baud rate 1200 SYST COMM SER BAUD 1200 UP BAUD update UART and response 1200 query the value 2 5 sec Recommended value Set factory default CAL DEF This set settings Baud 9600 Save current SAV 0 settings GPIB operation Action Command string Get power at 081 25 format 000 00 6 chars Terminator frequency response after approx lsec delay mode must 081 25GHz 081 25 2 345mW or be OFF see 081 25 0 000uW mi
14. se is correct The first six chairs mean set frequency The rest chairs do power value Decimal point in power value is not fixed Examples 1 12 34 uW at frequency 62 50GHz gives answer string 30 36 32 2E 35 30 20 31 32 2E 33 34 75 57 HEX values 2 10 25 dBm at frequency 75 50GHz gives answer string 30 37 35 2E 35 30 20 2D 31 30 2E 32 35 20 64 42 6D HEX values E band Power Meter Operational Manual Automatic setting of power meter operational modes Note If PC control mode has been already set symbol presents in LCD The DPM automatically turns to PC control mode if a command comes into DPM from a PC To leave PC control mode press any key Automatic setting of DPM operational modes can be provided through RS 232 or GPIB interface of a PC send to DPM control and display unit 6 bytes command through RS 232 or GPIB port BCDEFG 1 byte is B 42 hex to choose set mode C 2 nd byte 1 for Tab1 2 for Tab2 to choose point of measured power C must be 1 in this model D 3 rd byte 0 or 1 or 2 or 3 or 4 or 5 or 6 or 7 to choose frequency step 1OMHz 20MHz 50MHz 100MHz 200MHz 250MHz SOOMHz 1GHz correspondingly E 4 th byte 0 Watt units for power indication 1 dBm units F 5 th byte 0 PC control OFF 31 PC cont
15. t can be read when DPM starts SCPI has been set if screen as in Fig 10 Fig 11 ELVA control format has been set 3 To check current control protocol or change control protocol Press any key Insert symbols 992 E band Power Meter Operational Manual One of two types of screen appears I Fig 13 Current control format ELVA Choose a or b below a Press key if current control format satisfies b Press any key except to change format Press key if indicated control format satisfies The DPM Power meter is ready for operation if lines with frequency and power values are displayed like in Fig 14 Frequency of measured signal Measured power level Mode Tab Fig 14 Power meter is ready for measurements If display like on fig 15 appears symbol or or sign READY TO START as shown on the Fig 15 it means that DPM is in the automatic mode at the moment To leave the mode one should press any key E band Power Meter Operational Manual Fig 15 Power meter is in automatic mode 4 Choose measurement mode Watt or dBm for this press any key insert 997 code using keyboard press 0 for choosing Watt mode press any key except for choosing dBm mode press to leave the mode 5 Choose TAB Number TABI or TAB2 mode number for this press any key insert 999 code using keyboard press 1 for choosing TABI press 2 for ch
16. than the MAX level indicated on power sensor 20 mW 13 dBm One can measure mm wave power until sign OVERLAOD appears on the top line of LCD Alarm buzzer sounds at the same time Measured power level is at the bottom line of LCD If sign OVERLOAD appears one must decrease input mm wave power until OVERLOAD disappears The sensitivity of the sensor is frequency depended and the max measured power can exceed the MAX level at some frequencies It does not result in damage of power sensor E band Power Meter Operational Manual Block scheme of the Power Meter is shown in fig 1 110 VAC Power supply Liquid Crystal Display Power sensor with EEPROM and Video amplifier AD Converter pre amplifier Controller RS 232 Interface board or GPIB gt Control and Display Unit Fig 1 Block scheme of the Power Meter To get right absolute value of measured power it is necessary to set frequency of measured signal Value of measured frequency is set manually using 12 buttons keyboard or automatically through interface port Frequency format is XXX XX The frequency can be set manually in the format or insert through RS 232 or GPIB interface It is possible to shift the set frequency manually using and buttons One press on the buttons shifts the frequency correspondingly down and up on one step Step of frequency has a few fixed values within 0 01GHz 1GHz range Two line LCD displays set signal freq
17. tors are obtained and loaded into EEPROM memory of power sensor under calibration Obtained test data of power level measured with two power meters reference and calibrated power sensors after the calibration are presented in Tables 1 Linearity tests of calibrated power sensors are presented in Tables 2 E band Power Meter Operational Manual E BAND POWER SENSOR Table 1 aaa 14480 14490 Table 2 Set attenuation dB as ae cle ee are Input Power dBm co iso of 20 19 69 Linearity Eror of o 1 o1 Linearity Eror dB Se Ea a Linearity ErondB orf o1 O al 3 0 2 0 72 13 0 Linearity eror as_ of ol of 75 24 73 Linearity Eror of ol 77 77 126 Linearity error dB ooo ee oa 0 1 0 2 C aaee a a ee Linearity Eror oaf o o2 o2 78 73 124 Linearity eror dB of o o2 ws tos sa o2 48 Linearityenonae oo ot e of te oz 7 a2 ae Linearity erora ot ot 2 4 7 4 oO oO oO 20 E band Power Meter Operational Manual Appendix 1 Control of DPM power meter with SCPI protocol Software version 110707 1 Switch DPM power meter ON 2 Immediately after switching ON make sure the software version 110707 is used eae te Software version 110707 is loading 3 Check if SCPI control format is set It can be read when DPM starts SCPI control format has been set ELVA control format has been set To check curre
18. tp www icselect com The board uses commands SYSTem STATus CALibrate DIAGnostic and all IEE 488 2 Common Commands Command of SYST2 type is used for DPM control Only brief format of commands is allowed Example sens aver coun 50 Entire format is not allowed Example senser average counts 50 Format of a command allows using Capital or lower case letters Command with forward colon is wrong Example disp enab Correct disp enab All commands have to have symbol LF line feed OXA in the end Switching from Manual mode to Remote RS_control mode makes automatically if a command through GPIB RS 232 interface appears There is symbol in LCD 14 th symbol in 1 st line if REMOTE mode is ON despite if disp enab is off Frequency format in command and respond is numerical Format with 2 symbols after decimal point Examples 93 00 105 20 Power level format with uW mW or dBm units Examples 0 185 UW 0 185 MW 37 3 DBM If set frequency value is out of admissible range the value has not been accepted and changed and error appears 128 Numeric data not allowed Can be read upon query Code of last error is kept in DPM and can be read with command syst2 err After the command the error bite gets 0 The error byte gets 0 also if send commands syst2 pres or gtl or DPM is switching ON If REMOTE RS control is on switching of DPM off and next on makes disp enab off i e Display does not refresh indicated data
19. uency in GHz and absolute power value in micro Watts uW milliWatts mW or dBm E band Power Meter Operational Manual Power Sensor The power sensor is based on Zero Biased Detector ZBD with Low Barrier Schottky Diode of ELVA 1 Ltd manufacture The power sensor provides high sensitivity fast measurement speed and quick response to changes of input power The sensitivity of the detector is frequency depended To get right absolute value of measured power it is necessary to set frequency of measured signal using 12 bottons keyboard on front panel The amplitude and frequency dependences of the power sensor are stored in EEPROM installed inside There is an isolator at the input of the power sensor Isolator provides good matching of the power sensor with output of mm wave power source To improve sensitivity and decrease noise level a pre amplifier is built in the power sensor That is very important when small lt 10 microwatt power is being measured Block scheme of E band power sensor is shown in fig 2 Outward appearance of the sensor is presented in fig 3 Waveguide Zero Biased Pre amplifier amp Attenuator Detector EEPROM Fig 3 Power Sensor 1 Case with Zero Biased Detector and Pre amplifier with EEPROM inside 2 Mm wave input E band Power Meter Operational Manual Control and Display Unit Control and Display Unit has 12 keys keyboard 2 lines LCD on upper panel and power switch fuse and connectors on the r
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