Microwave Measurement System - ETS
Contents
1. een 24 Starting the 1710 0 40 25 Using the aired meiden te tt E Igor Deseret 25 Connecting and Using the Zero 26 iv www ets lindgren com 5 0 Menu Options Settings Command Set 27 Menu Options cc eei qe E n een eee 27 Menu Option Settings and Command 28 3 OR 4 DIGITS Ak ABOUT Version 3 XX Only sese 29 ALARM SETPOINT tet Re e ERREUR 30 31 AUTO RANGE BAUD RATE CONTRAST FILTER RESPONSE t nite tei 34 PARAMETER SCREEN nsns 35 PEAK HOLD SELF TEST STATUS Factory Default Settings 6 0 Theory of Operation Appendix A Warranty eere 49 Appendix B Error Messages ene 51 Self Test Error 51 Startup Error 52 REF OUTSIDE LIMIT iiic eire de 52 5SUP C OUTSIDE LIMIT eausa at 52 48SUP C OUTSIDE LIMIT cortes 52 8SUP C OUTSIDE LIMIT sss 52 BIAS C OUTSIDE LIMIT toe ee ete ind 53 STIM C OUTSIDE LIMIT sese 53 www ets lindgren com Append2. Connector Standard 9 pin 2 way communications input output Communications Protocol 8 data bits 1 stop bit no parity no flow control 9600 baud default Pin Designations Pin 2 Data received by HI 1710A from computer Pin 3 Data transmitted from HI 1710A to computer Pin 5 Ground 18 Specifications www ets lindgren com Calibration Calibration Calibrated at 2450 MHz for use in the ISM band e Calibration is performed at a standard temperature of 75 F in an anechoic chamber utilizing a slot radiator e A CW field is generated using crystal controlled solid state source e The power monitoring system is the HI 2795 Calibration Comparison System e The calibration field level is established using a reference survey meter with CDRH calibration correction factors e All ranges are calibrated at mid scale Power Cable The HI 1710A Microwave Measurement System is shipped with a three wire power cable When the cable is connected to an appropriate AC power source it connects the chassis to earth ground The type of power cable shipped with each HI 1710A depends on the country of destination www ets lindgren com Specifications Error Analysis Absolute Calibration Precision Linearity and AM response Frequency Response Near field response Polarization Pattern Temperature Supply Voltage RFI Overload Drift 1 0 mW cm 0 30 dB 0 13
3. Menu Option Serial Port Setting Command RAW Version 3 XX only FO SLOW F1 FAST F2 F RAW Version 3 XX only Unfiltered SLOW Eaquivalent to slow response mode on analog meters SLOW is the default setting and is used for most hand scanning of microwave ovens It responds more slowly to rapidly changing RF or leakage levels and tends to average the response to peak levels caused by oven mode stirring devices This is designed to meet the CDRH requirement that an instrument respond to a step CW microwave input to 90 of its steady state reading within a maximum of three seconds while still providing maximum smoothing of RF peaks FAST Euquivalent to fast response mode on analog meters It is used to observe rapid variations in RF leakage and to evaluate the effect of stirrer modulation on leakage Menu Options Settings Command Set www ets lindgren com PARAMETER SCREEN Displays system board voltages and probe voltages and offsets Change the setting to ON and exit the menu to display the parameter screen Press the ZERO button to escape the parameter screen Menu Option Serial Port Setting Command OFF EE ON Sample Parameter Screen e RF Probe RF level currently detected BIAS Probe bias reading value should be between 0 30 and 0 40 volts e REF Power supply reference voltage value should be between 1 22 and 1 26 volts e 5850
4. supply 5 voltage value should be between 4 75 and 5 25 volts e 8SUP Power supply 8 voltage value should be between 7 60 and 8 40 volts e 8SUP Power supply 8 voltage value should be between 7 92 and 8 08 volts e OFST Probe offset reading value should be between 0 02 and 0 40 mW 0 005 and 0 100 volts www ets lindgren com Menu Options Settings Command Set 35 e STIM Applies and displays a DC voltage to the input of the RF signal circuitry value should be between 2 44 and 4 88 Readings outside this range indicate a fault in the HI 2623 probe preamplifier e TEST Voltage at the analog output jack value should be between 3 80 and 4 20 volts If an error occurs in of the parameter readings the parameter screen displays and the erroneous reading flashes Turn the HI 1710A off correct the problem and then turn it on again PEAK HOLD Captures and holds the highest leakage reading displayed Menu Option Serial Port Setting Command ON P1 OFF PO P e While in Peak Hold the bar graph on the display shows the current instantaneous RF reading without filtering A bar graph segment remains lit to indicate the relative location of the peak reading The bar graph display responds very rapidly and will show stirrer turntable modulation as well as minima and maxima of leakage around the microwave oven periphery e Because of the fast unfiltered response
5. 1710 Microwave Measurement System User Manual WETS LINDGREN OLADAY EMF MEASUREMENT ETS Lindgren Inc reserves the right to make changes to any product described herein in order to improve function design or for any other reason Nothing contained herein shall constitute ETS Lindgren Inc assuming any liability whatsoever arising out of the application or use of any product or circuit described herein ETS Lindgren Inc does not convey any license under its patent rights or the rights of others Copyright 2001 2014 by ETS Lindgren Inc All Rights Reserved No part of this document may be copied by any means without written permission from ETS Lindgren Inc Trademarks used in this document The ETS Linagren logo is a trademark of ETS Lindgren Inc Avery is a registered trademark of Avery Dennison Corporation Revision Record MANUAL HI 1710A Part H 600094 Rev E Revision Description Date A Initial Release May 2001 B Added Alarm Out pin definitions June 2008 rebranding C Updated Error Analysis table in June 2009 Specifications D Updated for v3 0 firmware release May 2012 E Updated Menu Option Settings August 2014 table in Filter Response command www ets lindgren com This page intentionally left blank www ets lindgren com Table of Contents Notes Cautions and 5 vii General Safety
6. For the steps to return a system or system component to ETS Lindgren for service see the Product Information Bulletin included with your shipment www ets lindgren com Maintenance 15 This page intentionally left blank 16 Maintenance www ets lindgren com 3 0 Specifications Electrical Specifications Ranges Four ranges 0 1 0 2 0 5 and 0 10 mW cm2 Response Characteristics 0 to 90 of final value for step input FO Raw Version 3 XX only unfiltered e F1 Slow less than three seconds e F2 Fast less than one second Maximum Power Density 2 0 Watts cm 2000 mW cm Power Input 100 240 VAC 0 8 0 4 A max 50 60 Hz Fuses 250 Volt 1 0 Amp Type T 5 mm x 20 mm Control Inputs Zero Dry switch closure to zero the HI 1710A RS 232 Standard 9 pin 2 way communications input Control Outputs Alarm Output Form C contact 24 V 1 Amp Analog Output 4 VDC max 1 mA max RS 232 Standard 9 pin 2 way communications output www ets lindgren com Specifications Environmental Operating Temperature 15 C 40 C Humidity 5 to 95 relative humidity non condensing Physical Specifications Dimensions Height 127 mm 5 0 in Width 311 mm 12 25 in Depth 254 mm 10 0 in Probe Probe Length 305 mm 12 in Cable Length 2 74 m 9 ft Weight 3 6 kg 8 Ib RS 232 Specifications
7. 32 Sets the communication rate between the HI 1710A and an external device Menu Option Serial Port Setting Command 57600 B57 19200 B19 9600 B96 4800 B48 2400 B24 1200 B12 600 B60 300 B30 B e After the baud rate is changed on the HI 1710A it also must be changed on the external device When baud rates are incorrectly set a video display terminal VDT may display nonsense or non printing characters e The baud rate is changed immediately when a B command is sent The baud rate setting is saved in memory when the power is turned off Menu Options Settings Command Set www ets lindgren com CONTRAST Increase the value to darken the display or decrease it to lighten the display Menu Option Serial Port Setting Command 0 8 C0 8 When echo is on keyboard entries on the VDT will also be displayed on the VDT screen Menu Option Serial Port Setting Command OFF EO ON E1 E e The echo mode can be used when marginal transmission conditions exist or when the HI 1710A is connected to a full duplex terminal that requires the characters be re transmitted www ets lindgren com Menu Options Settings Command Set 33 FILTER RESPONSE 34 Digital filtering or response times changes the response to rapidly changing RF or leakage levels see Theory of Operation on page 47 for more information
8. To prevent electrical shock do not remove cover Warranty may be void if the housing is opened If you have any questions concerning maintenance contact ETS Lindgren Customer Service Software Firmware Updates Version 3 XX Only Periodically you should check for updates to the software firmware for your HI 1710A Microwave Measurement System e Goto www ets lindgren com On the Resources menu click Software Firmware In the Software Firmware column look for HI 1710A files Save the zip file to the desired location on your computer In the same section where the zip file is located click the link to download the installation instructions Follow those instructions to install the new software firmware www ets lindgren com Maintenance 13 Replacing the Fuse CAUTION Disconnect the HI 1710A from power before replacing a fuse If the HI 1710A fails to operate check for a blown fuse inside the power entry module A blown fuse must be replaced with the same value and type of fuse or an unsafe condition may result Use only 250 Volt 1 0 Amp Type T b mm x 20 mm fuses To replace a fuse 1 Two fuses are located in the fuse drawer in the power input module Use a screwdriver to open the drawer 2 The fuse towards the outside of the drawer is the spare Remove the spare fuse from the module 1 I Working Spare fuse fuse 3
9. 0 15 0 04 0 29 0 21 0 0 11 0 46 0 15 0 01 0 01 0 01 0 04 1 068 1 568 dB Values are combined in an RMS manner 20 Specifications www ets lindgren com 4 0 Operation Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Do not use without spacer cone in place About Zeroing Zeroing determines the offset value that will be subtracted from all subsequent measurements RF must not be present in the vicinity of the probe when the zero switch is activated or it will result in an inaccurate zero There are three ways to zero a probe connected to the HI 1710A Microwave Measurement System e Press the ZERO button on the front panel e Sendthe serial port command Z e Attach an external device to the ZERO connector on the back panel The zero will drift as the electronic circuitry and diodes warm up to normal operating temperature There will also be small variations as the ambient temperature changes during the day For these reasons the zero point must be reset periodically In addition the bias and offset readings are checked against preset internal limits each time the zero switch is activated If the limits are exceeded an error message is displayed Zeroing in a sufficiently high RF field or zeroing with the probe removed will also cause an error These tests measure
10. 4 digits e In3 digit mode the fourth digit is rounded and not displayed In 4 digit mode some least significant bit noise will be seen resulting in the least significant digit changing 28 Menu Options Settings Command Set www ets lindgren com ABOUT VERSION 3 XX ONLY Displays returns the installed firmware version and other ETS Lindgren and system information When ON is selected the information will display for approximately 10 seconds Menu Option Serial Port Setting Command OFF ON IDN www ets lindgren com Menu Options Settings Command Set ALARM SETPOINT Sets a level after which an alarm will sound to indicate that the measured leakage has exceeded the level gt The alarm will sound only if the audio is turned on To turn on the alarm see Audio on page 31 Menu Option Serial Port Setting Command XX XX n on Where is a value from 0 to 9999 in mW cm For example 5000 is 5 0 mW cm 5 is 0 005 mW cm and so Each press of the up down arrow button will raise lower the setting by 0 01 for the first ten presses 9 99 9 98 9 97 and so on by 0 10 for the next ten presses 9 89 9 79 9 69 and so on and by 1 00 for the remaining presses 8 89 7 89 6 89 and so on e Anytime a change in direction is made up or down the change increment begins at 0 01 The alarm will sound only when the displayed RF v
11. Considerations viii 1 0 Introduction eese enne 9 HI T710A Features eeiam Hen eng 9 Standard Configuration uon e e tace edat 10 Optional External Zero Receptacle 11 ETS Lindgren Product Information Bulletin sess 11 2 0 Maintenance anina iaaa 13 Software Firmware Updates Version 3 XX 13 Replacing the FUS i inen nie terere rigen 14 Replacement and Optional Parts 15 Annual C libration cte acne eden eerie eens 15 Service Procedures eder p dde penc 15 3 0 Specifications cerent 17 Electrical Specifications ies debet 17 Physical Specifications 18 RS 232 Specifications 2 18 Calibration vec dtc terc dL pet P dg dut 19 Power Gabl6 x ener i PU ee ES 19 ErrorzAnalyslS seis testes snd testcccauenssadanecdsshthentvndinesdsdenayatentinesdodedenteerabeestusedraes 20 4 0 Operation 5 5 1 cuire ecu Ear 21 About Zetolng 21 Menu Navigatio icici orn eerie retenir eere rer 22 Back Panel Controls and 23 ZERO eee e ac eer erede pee peces 23 ANALOG OUT ALARM OUT vi RS 232 Digital Input Output
12. Does not print summary ticket when zeroed Changes the output format of the status messages 50 58 The transmitted summary messages are shortened for easier adaptation to a computer interface program The zero command does not transmit a formatted report as in mode 2 In mode 3 the transmitted status messages end with only a carriage return terminator CR In modes 0 1 and 2 the messages end with a carriage return and a line feed CR LF 38 Menu Options Settings Command Set www ets lindgren com RANGE The range determines the full scale setting of the bar graph display located on the front panel digital readout for a continuous analog indication of the measured leakage level The four ranges have full scale indications of 1 2 5 and 10 mW cm the digital display will always indicate any value between 0 and 9 999 mW cm When set to auto range the best range for each measuring condition will automatically be selected For more information on auto range see page 31 Menu Option Serial Port Setting Command AUTO A1 0 1mW R1 0 2mW R2 0 5mW R3 0 10mw R4 R e With no RF input the instrument will shift to the 0 1 mW cm scale e When the displayed value exceeds 95 of full scale the next higher scale is automatically selected e While the digital reading will always indicate any value up to 9 999 mW cm the bar graph display will change to reflect the correct percentage of the newly se
13. back panel of the HI 1710A Menu Option Serial Port Setting Command ON OFF VERSION FIRMWARE VERSION 3 XX ONLY Returns the version of installed firmware Menu Option Serial Port Setting Command VER Format X XX ZERO Zeros the probe performs the same function as pressing the ZERO button on the front panel Menu Option Serial Port Setting Command Z When the zero command is received and the RS 232 output is in mode 2 default mode a formatted output message is sent through the serial port and the probe is zeroed The formatted message transmits the RF reading only when the front panel Peak Hold mode is ON www ets lindgren com Menu Options Settings Command Set Factory Default Settings All settings are stored in memory The last settings used will be restored each time the HI 1710A is turned off RESET returns the HI 1710 to factory default settings For more information on RESET see page 44 When you receive the HI 1710A it is configured with the following settings these default settings can be used for normal production line testing 3 or 4 Digits 3 two places to the right of the decimal Alarm Set Point 5 0 Audio Alarm OFF Baud Rate 9600 Display Contrast 7 Filter Response Slow Peak Hold OFF Print Mode 2 Range 0 1 mW cm 46 Menu Options Settings Command Set www
14. ets lindgren com 6 0 Theory of Operation The HI 1710A Microwave Measurement System uses a unique diode dipole antenna sensor that is coupled with digital filtering techniques developed for Automatic Microwave Oven Scanner Systems A radial array of eight antennas is located perpendicular to the axis of the probe handle The electric field is detected by hot carrier diodes operating in the square law region A negative voltage is applied to the cathode connection of the diodes to bias them in an optimum operating region The bias is adjusted individually for each probe preamplifier assembly The diode signals are summed and input to two stages of amplification The amplifying stages perform analog filtering to minimize external interference at 60 Hz The analog output of the preamplifier is connected to one input of a seven channel analog to digital converter The bias input is connected to another channel Scaled values of the various power supply voltages are connected to the remaining inputs The digital equivalent of the RF signal is input to the microprocessor A software implemented filter is used to condition the RF signal for most effective RF measurement The filtering in the HI 1710A is accomplished by an integrating software filter Sets of fixed filter parameters can be selected from the front panel of the HI 1710A Selecting filter 1 F1 SLOW results in a digital filter characteristic with a rise time 90 of less than three
15. of the bar graph display the digital peak reading may lag behind the bar graph indication depending on the filter factor chosen When the instantaneous RF indication on the bar graph display is greater than the reading on the digital display the bar graph segment proportional to the digital reading is unlit In this way the Peak Hold mode of the meter can be used to observe the effects of the various digital filters on fast changing RF inputs In the normal mode not Peak Hold the bar graph display follows the filtered display reading 36 Menu Options Settings Command Set www ets lindgren com PRINT MODE There are four modes that specify the content and length of the information provided during testing See page 42 for the status message formats for modes 0 1 and 2 and page 43 for mode 3 Menu Option Serial Port Setting Command 0 MO 1 M1 2 M2 3 M3 M Mode 0 Print mode off Select this mode when no automatic output from the HI 1710A is needed for example when all output is specifically requested by the controller This mode might be chosen in a fully automatic test system where the external device requests the measurement data gathering and the zeroing of the meter Status messages are transmitted in the same form as in mode 2 but no message is transmitted by the HI 1710A when the zero command is received Mode 1 Prints continuous reading In this mode the HI 1710A con
16. response characteristic provides maximum smoothing of RF variations After the test is completed and the RF reading recorded zero the HI 1710A again before the next test The zero point may gradually drift over long periods Re zero before beginning a test Connecting and Using the Zero Receptacle The zero receptacle should be located in an area that is relatively free of significant RF fields The fields near the zero receptacle should be checked periodically to confirm that no significant stray fields are present 1 Attach the cable to the ZERO BNC connector located on the back of the HI 1710A 2 Attach the other end of the cable to the connector on the side of the zero receptacle The zero receptacle is most often used with Peak Hold mode When scanning an oven in Peak Hold the highest reading is displayed on the HI 1710A When the probe is inserted into the zero receptacle the RF reading is sent to the RS 232 serial port for automatic data collection and the probe is zeroed For manual data recording the RF reading must be recorded before the probe is inserted into the zero receptacle 26 Operation www ets lindgren com 5 0 Menu Options Settings Command Set Menu Options E Use the arrow buttons on the front of the HI 1710A to navigate the menu See Menu Navigation on page 22 for a description of the arrow buttons Following are the menu options and command set for the HI 1710A Microwave Measurement
17. seconds This response is equivalent to the SLOW response of the common analog microwave survey meter Filter 2 F2 FAST results in a digital filter characteristic with a rise time 9096 of less than one second The response of this filter is much faster and is equivalent to the FAST response of an analog survey meter After filtering the final leakage value is displayed as a 3 or 4 digit value The microprocessor also performs the peak hold and alarm functions In the Peak Hold mode the bar graph display is driven without any digital filtering to display the real time variations in the RF level In the Peak Hold mode the highest reading sent to the digital display by the processor is held and continuously displayed until either a higher reading is transmitted or until the probe is zeroed The peak value displayed is the value obtained after all filtering is accomplished www ets lindgren com Theory of Operation 47 When not in the Peak Hold mode the bar graph display responds to the filtered signal as displayed The system performs a series of self tests at startup and each time the probe is zeroed The bias voltage is measured to check for defective diodes and for a proper bias supply and then the offset voltage of the array is measured The offset voltage is the signal at the preamp output with the probe in a zero RF field Limits on the offset voltage check for proper probe preamplifier operation A zero chamber option is available
18. voltage low Bias voltage high The probe bias voltage is beyond specification Check the negative 8 volt supply level If the supply voltage is within specification the probe preamplifier assembly should be replaced If the bias voltage is still beyond specification return for service STIM C OUTSIDE LIMIT STIM test low e STIM test high A fault exists the RF signal processing path Replace the probe preamplifier assembly if the error persists return for service www ets lindgren com Error Messages This page intentionally left blank 54 Error Messages www ets lindgren com Appendix C Summary of RS 232 Command Set For a list of factory settings see page 46 Function Command Range Default 3 or 4 digit display Dit 3 4 3 Alarm trigger point THHHH 0 9999 5000 Audio mode 1 ON Q 0 1 0 Auto range 1 ON 0 1 0 Baud rate Bi 12 96 96 Echo 1 ON E 0 1 0 Filter Response number F 0 2 1 0 is available only in Version 3 XX Re initialize system Reset Peak Hold 1 ON P 0 1 0 Print mode M 0 3 2 Range R 1 4 1 Self test ST Zero meter Z www ets lindgren com Summary of RS 232 Command Set This page intentionally left blank 56 Summary of RS 232 Command Set www ets lindgren com Appendix D EC Declaration of Conformity SETS LINDGREN ESCO Technologies Company Declaration of Conf
19. IT 8SUP OUTSIDE LIMIT 8SUP OUTSIDE LIMIT STIM OUTSIDE LIMIT www ets lindgren com Error Messages Startup Error Messages As part of the self test performed on startup a number of error messages can be displayed indicating operating problems In addition the offset and bias values of the probe are measured each time the probe is zeroed If an erroneous reading is detected the HI 1710A Microwave Measurement System will display the parameter screen and the erroneous reading will flash A message will also be sent to the RS 232 port Following is the action to be taken for each error REF C OUTSIDE LIMIT e 1 24 volt supply low e 1 24 volt supply high The 1 24 volt reference to the A D converter is beyond specification Return for service if error message persists 5SUP C OUTSIDE LIMIT e supply low e supply high The 5 volt logic supply is beyond specification Voltage is not user adjustable return for repair 8SUP C OUTSIDE LIMIT e 8 supply low e 8 volt supply high The 8 volt supply to the analog circuitry is beyond specification Voltage is not user adjustable return for repair 8SUP C OUTSIDE LIMIT 8 volt supply low e 8 supply high The negative 8 volt supply to the analog circuitry is beyond specification Voltage is not user adjustable return for repair 52 Error Messages www ets lindgren com BIAS C OUTSIDE LIMIT e Bias
20. Replace the blown fuse with the spare fuse 4 Slide the fuse drawer back into the module Make sure that the drawer snaps securely into its locked position 14 Maintenance www ets lindgren com Replacement and Optional Parts ETS Lindgren may substitute a similar part or new part number with gt the same functionality for another part part number Contact ETS Lindgren for questions about part numbers and ordering parts Following are the part numbers for ordering replacement or optional parts for the HI 1710A Part Description Part Number Microwave Oven Probe HI 2623 The HI 2623 Microwave Oven Probe may be used interchangeably gt with the HI 1710A A calibrated assembly may be used to replace the existing probe eliminating downtime Many service problems are related to probe or cable damage and can be corrected without sending the HI 1710A for service Spacer Cone Kit Includes 10 cones and 20 shields H 540013 To maintain stated accuracy use only ETS Lindgren replacement 3 cones Zero Receptacle H 490930 Annual Calibration See the Product Information Bulletin included with your shipment for information on ETS Lindgren calibration services Service Procedures The inner case of the HI 1710A is sealed to maintain calibration Normally user repair operations are limited to verification of proper input voltage and replacement of the probe preamplifier assembly
21. System each is described in the following pages Menu Option amp Serial Port Command Serial Port Command Only 3 OR 4 DIGITS see page 28 ABOUT see page 29 ALARM SETPOINT see page 30 AUDIO see page 31 BAUD RATE see page 32 CONTRAST see page 33 FILTER RESPONSE see page 34 PARAMETER SCREEN see page 35 PEAK HOLD see page 36 PRINT MODE see page 37 RANGE see page 39 RESET see page 44 SELF TEST see page 40 STIM see page 44 TEST ALARM see page 45 AUTO RANGE see page 31 Auto Range is also a setting in the RANGE menu option see page 39 ECHO see page 33 STATUS see page 41 VERSION firmware see page 45 ZERO see page 45 www ets lindgren com Menu Options Settings Command Set 27 Menu Option Settings and Command Set Following is a description of each menu option and the available settings The majority of the menu options have an equivalent serial port command that can be used to set or retrieve a status in a few cases there is no menu option and only the serial port command can be used E All serial port commands must be completed with a carriage return CR 3 OR 4 DIGITS Specifies whether 3 or 4 digits will display includes digit to the left of the decimal point and either 2 or 3 digits to the right of the decimal point Menu Option Serial Port Setting Command 3 D3 4 D4 D e numeric commands return a total of 3 or
22. alue exceeds the alarm set point For example if the alarm is set at 4 99 mW cm the alarm will only sound when the displayed RF level is 5 00 or greater Once the RF level decreases below the alarm set point the alarm will turn off 30 Menu Options Settings Command Set www ets lindgren com AUDIO Turns on the audible alarm indicator which will sound to indicate that the measured leakage has exceeded a preset level alarm set point Although the alarm set point may be specified the alarm will not sound unless the audio is turned on For set point information see page 30 Menu Option Serial Port Setting Command OFF Qo ON Q1 Q AUTO RANGE When set to auto range the best range for each measuring condition will automatically be selected Menu Option Serial Port Function Setting Command AO OFF 1 A Retrieve status The auto range setting only affects the bar graph display and the analog output When in Peak Hold with the range set to AUTO the range will change as the field strength increases it will remain in the range that shows the highest peak value until the ZERO button is pressed This is so the peak value can be displayed on the bar graph When the ZERO button is pressed with no field present the range will revert back to the lowest 1 mW cm2 www ets lindgren com Menu Options Settings Command Set 31 BAUD RATE
23. be used to attach an external device to the ZERO connector See About Zeroing on page 21 for more information on the zero function ANALOG OUT This analog output BNC connector is a DC voltage varying from 0 to 4 volts proportional to the full scale range setting For example with the instrument on range 2 0 2 mW cm a leakage value of 2 mW cm will have an analog signal of 4 VDC and a 1 mW cm value will have a signal of 2 VDC On range 4 0 10 mW cm the 4 VDC analog output signal will indicate 10 mW cm The resistance of the external load connected to the analog output receptacle should not be less than 5000 ohms www ets lindgren com Operation 23 ALARM OUT Pin Definition 1 NC 2 NC 3 Normal 4 Common 5 Alarm Back of HI 1710A Alarm Out RS 232 DIGITAL INPUT OUTPUT This two way standard 9 pin RS 232 serial data port is used to connect external devices These external devices can monitor and or control the HI 1710A All functions normally accessed by the touch switch inputs can be controlled externally and all data normally displayed can be transmitted through the serial port This is accomplished using a simple command structure of ASCII character codes and a controller such as a personal computer or a video display terminal VDT See Appendix C on page 55 for a summary of commands The default mode of the HI 1710A generates a formatted test summary When on the default conditions a
24. e Power cable 10 Introduction www ets lindgren com Optional External Zero Receptacle The external zero receptacle will help shield the probe from stray RF fields while being zeroed Additionally in high volume testing situations the zero receptacle can reduce wear on the ZERO button located on the HI 1710A front panel The zero receptacle ships with a 10 foot cable For ordering information see Replacement and Optional Parts on page 15 For information on using the zero receptacle see Connecting and Using the Zero Receptacle on page 26 ETS Lindgren Product Information Bulletin See the ETS Lindgren Product Information Bulletin included with your shipment for the following e Warranty information e Safety regulatory and other product marking information Steps to receive your shipment e Steps to return a component for service e ETS Lindgren calibration service e ETS Lindgren contact information www ets lindgren com Introduction This page intentionally left blank 12 Introduction www ets lindgren com 2 0 Maintenance Before performing any maintenance follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Maintenance of the HI 1710A is limited to een external components such as cables or connectors Clean the exterior of the cabinet using a damp cloth and mild cleaner Always unplug the unit before cleaning
25. his cable grounds the instrument cabinet Warning For indoor use only do not expose to rain Caution This instrument is shipped with a CAUTION three wire power cable in accordance viii www ets lindgren com 1 0 Introduction The ETS Lindgren Holaday HI 1710A Microwave Measurement System combines the proven and reliable diode sensing technology of the ETS Lindgren Holaday Microwave Survey Meters with the digital processing techniques developed for automatic oven scanning HI 1710A with HI 2623 Microwave Oven Probe HI 1710A Features HI 1710A Front Panel e Provides time response characteristics or filters raw Version 3 XX only fast and slow These allow standard hand scan measurements as well as the potential for faster scanning similar to that of automated scanning systems e The unit is shielded with the necessary isolating and attenuating devices to provide immunity to stray leakage of microwave energy e The circuitry is powered by a regulated supply with normal industrial transient protection devices www ets lindgren com Introduction e The diode detection array of eight hot carrier diodes is housed in the large end of the plastic probe assembly This antenna array has the unique feature of being able to sum microwave electric fields of any plane perpendicular to the axis of the probe The antenna lobe is also very broad making it easy to use when measuring leakage around a
26. ix C Summary of RS 232 Command Set 55 Appendix D EC Declaration of Conformity 57 vi www ets lindgren com Notes Cautions and Warnings gt Note Denotes helpful information intended to provide tips for better use of the product Caution Denotes a hazard Failure to follow instructions could result in minor personal injury and or property damage Included text gives proper procedures Warning Denotes a hazard Failure to follow instructions could result in SEVERE personal injury and or property damage Included text gives proper procedures See the ETS Lindgren Product Information Bulletin for safety regulatory and other product marking information www ets lindgren com vii General Safety Considerations Safety Symbol Definition Warning This is a Safety Class product provided with a protective earthing ground incorporated in the power cord The mains plus shall only be inserted in a socket outlet provided with a protective earth contact Any interruption of the protective conductor inside or outside the instrument is likely to make the instrument dangerous Intentional interruption is prohibited DO NOT defeat the earth grounding protection by using an extension cable power cable or autotransformer without a protective ground conductor with international safety standards When connected to an appropriate power line outlet t
27. lected range When the displayed value drops below 30 of full scale the next lower range is selected e If the unfiltered RF signal from the probe exceeds 20 mW cm or the filtered RF signal exceeds 10 mW cm the HI 1710A will indicate an over range condition by sounding a continuous beep The over range condition will remain until the filtered RF signal drops below 10 mWicm www ets lindgren com Menu Options Settings Command Set 39 SELF TEST 40 Performs a series of self tests when the self tests are complete the probe is ready to be zeroed Menu Option Serial Port Setting Command SELF TEST ST After successful completion of the self test the HI 1710A sends SELF TEST PASSED message plus three blank lines ZERO button to initiate another self test Menu Options Settings Command Set If the self test fails the parameter screen displays Press the If an error occurs turn off the HI 1710A correct the error and then turn on the HI 1710A www ets lindgren com STATUS Checks status for the following Menu Serial Port Function Option Command So Send System Status 81 Send Alarm Set Point S2 Send Range Number S3 Send Filter Number S4 Send Bias Voltage S5 Send Offset S6 Send STIM Value S7 Send Power Supply Voltages S8 Send RF Reading S9 Send Non Filtered RF Version 3 XX only Reading Versio
28. n oven door The cone spacer is designed to provide 5 cm spacing as required by the CDRH performance standard from the tip of the probe cone to the center of the array The shape of the cone provides minimum perturbation of the electric field impinging on the diode array The probe is attached permanently to the preamplifier assembly by a 9 ft shielded cable Each detection probe and amplifier assembly is calibrated as a unit and can be used interchangeably with any HI 1710A readout The digital indicator reads to two or three decimal places from 0 to 9 999 mW cm Temporary over exposure to microwave fields up to 2000 mW cm will not cause probe burnout or damage the instrument or the calibration e Either auto range or four ranges with full scale indications of 1 2 5 and 10 mW cm can be selected from the front panel or with a remote serial port command Selecting the range determines the full scale setting of the bar graph display located below the digital readout for a continuous analog indication of the measured leakage level e audio alarm circuit can be set to any level up to 9 99 mW cm When the level of the microwave leakage exceeds the pre selected value the audio alarm will sound if the audio is enabled alerting the operator that the chosen level has been exceeded For more information about the alarm see page 30 Standard Configuration HI 1710A Microwave Measurement System e HI 2623 Microwave Oven Prob
29. n 3 XX only In Peak Hold mode S8 will return peak RF value For the current RF reading use S9 The format of information returned depends on the current print mode See page 42 for the status message formats for print modes 0 1 and 2 and page 43 for print mode 3 For more information on print modes see page 37 www ets lindgren com Menu Options Settings Command Set Print Modes 0 1 2 50 DIGITS V AUTO RNG WWW PEAK HOLD XXX YY RNG PRINT MODE Z Where Vis3or4 e WWW is ON or OFF e XXX is ON or OFF e YYis IN or OUT e Zis 0 1 or2 S1 ALARM X XX or X XXX 52 SCALE X S3 FILTER XXXX Where XXXX is RAW Version 3 XX only FAST or SLOW S4 BIAS X XX or X XXX S5 OFFSET X XX or X XXX S6 STIM X XX or X XXX S7 REFERENCE X XXX 5 VOLTS X XXX 8 VOLTS X XXX 8 VOLTS X XXX 58 RDNG OK X XXX The RF value depends on the filter setting S9 Version 3 XX only RDNG OK X XX or X XXX The RF value is raw unfiltered 42 Menu Options Settings Command Set www ets lindgren com e Print Mode 3 S0 XXXXX e First digit 3 or 4 for number of digits displayed and transmitted Second digit O0 or 1 for auto range off or on e Third digit 0 or 1 for Peak Hold off or on Fourth digit O or 1 for in range or over range e Fifth digit 0 1 2 or 3 for
30. ng settings for the test needs For normal tests or a beginning point use the default conditions To select settings see Menu Options Settings and Command Set on page 27 3 Zero the probe before beginning the test With the oven operating with a suitable load move the probe across the oven surfaces keeping the probe axis handle perpendicular to the potential leak area Hold the probe by the red handle to avoid potential interference Keep other parts of the body and the probe cord away from the immediate vicinity of the probe head www ets lindgren com Operation 25 The analog bar graph display may be used to determine areas of highest leakage In the normal mode not Peak Hold the bar graph display will track the displayed digital value and respond to the filtered RF signal When the instrument is operated in the Peak Hold mode the bar graph display is not filtered and responds very rapidly to changes in RF intensity The Peak Hold mode may be used while scanning to capture the area of highest leakage while the bar graph will continuously display instantaneous variations in leakage Changing the filter selection to FAST will decrease the response time of the system This will more effectively show the effect of rapid variations in RF levels due to mode stirrers or other modulating devices In both the SLOW and FAST filter positions the response time meets the CDRH requirement for RF measuring instrument response times while the SLOW
31. operating mode S1 X XX Alarm trigger point X XXX in four digit mode S2 X Range number 1 4 S3 X 1 F1 Slow S4 X XXX Bias voltage X XXX in four digit mode S5 X XXX Offset milliwatts X XXX in four digit mode S6 X XX STIM test value X XXX in four digit mode S7 X XXX Reference voltage level X XXX 5 volt power supply level X XXX 8 volt power supply level X XXX 8 volt power supply level S8 X XX RF reading X XXX in four digit mode S9 X XX Version 3 XX only Raw unfiltered RF value X XXX in four digit mode www ets lindgren com Menu Options Settings Command Set 43 STIM RESET 44 Performs a stimulus routine to verify that the probe is operational Menu Option Serial Port Setting Command NO YES S6 e When activated the HI 1710A will apply a DC voltage to the input of the RF signal e The value should be between 2 44 and 4 88 Readings outside this range indicate a fault in the HI 2623 probe preamplifier This will reset the HI 1710A to factory settings and overwrite any settings you changed See Factory Default Settings on page 46 for more information In addition to resetting the system to factory defaults RESET performs the self test sequence Menu Option Serial Port Setting Command NO YES I Menu Options Settings Command Set www ets lindgren com TEST ALARM Sets or resets the alarm relay located on the
32. ormity We ETS Lindgren L P 1301 Arrow Point Drive Cedar Park TX 78613 USA declare under sole responsibility that the Model Part Number 1710 Model Part Name Microwave Measurment System Date of Declaration 29 June 2001 to which this declaration relates meets the requirements and is in conformity with the relevant EC Directives listed below using the relevant section s of the following EC harmonized standards and other normative documents Applicable Directive s 7 i 1 Irectiv Applicable harmonized standard s and or normative document s 5 ciremagneti 6 99 an eti ENC Pa for equipment with rated current less than or equal to 16 A Authorized Signatories D 2 j ES fr at ETS Lgdgren L ETS Lindgren L P Bryan General Manager James C Psencik Vice President of Engineering The authorizing signatures on this Declaration of Conformity document authorizes ETS Lindgren L P to affix the CE mark to the indicated product CE marks placed on these products will be distinct and visible Other marks or inscriptions liable to be mistaken with the CE mark will not be affixed to these products ETS Lindgren L P has ensured that technical documentation shall remain available on premises for inspection and validation purposes for a period ending at least 10 years after the last product has been manufactured www ets lindgren com EC Declaration of Conformity 57
33. re 8 data bits 1 stop bit no parity and no flow control The HI 1710A is set up at the factory for 9600 baud This makes it possible to connect a monitoring device such as a VDT or printer The baud rate of the serial port can be changed either through the HI 1710A menu options or by an external command through the RS 232 serial port 24 Operation www ets lindgren com Starting the HI 1710A 1 With the power off attach the HI 2623 Microwave Oven Probe to the probe connector on the front of the HI 1710A Insert the connector so that the locating screw is facing upward 2 Connect the HI 1710A to AC power 3 on the power switch on the front of the HI 1710A The screen will display the firmware version and additional ETS Lindgren information During this time a series of self tests are performed when the self tests are complete the probe is ready to be zeroed 4 Place the probe in a zero field environment and then press ZERO on the front of the HI 1710A When zeroing is complete the HI 1710A is ready for operation Using the HI 1710A Check the probe spacer cone for damage discoloration or contamination Accuracy may be affected by cone wear or damage or by contamination by metallic particles which may become imbedded in the cone If necessary replace the cone See Replacement and Optional Parts on page 15 for part numbers 1 Allow the HI 1710A to warm up for at least 10 minutes 2 Select the operati
34. the performance characteristics of the probe and serve as failure indicators www ets lindgren com Operation 21 Menu Navigation Probe connector HI 1710A Front Panel See Menu Options Settings and Command Set on page 27 1 To display the menu press any arrow button on the front of the HI 1710A 2 Press the down arrow button to move the highlighted selection down one item at a time and press the up arrow button to move the highlighted selection up one item at a time 3 With the item you want to change highlighted press the left right arrow button to move to the settings for that item 4 Press the up or down arrow buttons to scroll through the available settings for the highlighted item 5 Highlight the desired setting and then release the buttons After approximately three to four seconds the display will return to the main screen with the new highlighted settings in effect Version 3 XX only Press the ZERO button once on the front of the HI 1710A to go back one level in the menu Do not to press the button more than once or you will zero the probe 22 Operation www ets lindgren com Back Panel Controls and Connectors SNETS LINDGREN HOLADAY EMF MEASUREMENT MADE IN U S A ETS LINDGREN LP 1301 ARROW POINT DRIVE CEDAR PARK TX 78613 0 4 VDC ALARM OUT ZERO 1 mA MAX 24 V 1 AMP RS 232 Hi 4 3 97 lt g goe HI 1710A Back Panel ZERO Can
35. tinually sends the RF reading through the RS 232 serial port Data is transmitted at a high rate and can only be used at baud rates of 4800 and above data is sent at a rate of 45 Hz the same rate at which the probe is sampled The controlling device must be able to receive a serially transmitted 4 digit number 45 times a second This mode might be used in the laboratory to investigate the effects of different filter constants and scan rates The output from the HI 1710A is a three or four digit ASCII string in the format X XX or X XXX www ets lindgren com Menu Options Settings Command Set 37 e 2 Prints summary ticket This is the default mode The HI 1710A sends a pre formatted summary report through the RS 232 serial port each time the probe is zeroed This is most useful when using Peak Hold mode With this configuration a serial input printer set up to print adhesive backed labels can be connected to the RS 232 serial port After scanning an oven the meter is zeroed On zeroing a ticket is printed with the maximum leakage observed as well as several system test parameters The output is formatted for a standard 3 1 2 in x 15 16 in label for example Avery label 4013 Line feed characters are transmitted following the formatted data to advance one additional label space with each formatted output By printing the report on every other label the labels can be removed from the backing more conveniently e 3
36. to minimize the RF present at the probe head during zeroing see Zero Receptacle Option on page 11 A stimulus voltage is applied to the input of the first operational amplifier stage in the preamp This signal is used to test the integrity of the RF signal path The level of each of the four power supply outputs is tested on startup If an error is detected the parameter screen will be displayed with the erroneous value flashing Upon zeroing the self test is repeated until all errors are corrected 48 Theory of Operation www ets lindgren com Appendix A Warranty See the Product Information Bulletin included with your shipment for the complete ETS Lindgren warranty for your HI 1710A Microwave Measurement System DURATION OF WARRANTIES FOR HI 1710A All product warranties except the warranty of title and all remedies for warranty failures are limited to one year Product Warranted Duration of Warranty Period HI 1710A Microwave 1 Year Measurement System www ets lindgren com Warranty 49 This page intentionally left blank 50 Warranty www ets lindgren com Appendix B Error Messages In any mode an invalid command will produce the error message ENTRY ERROR PLEASE RETRY Self Test Error Messages The following error messages will be transmitted if during the self test an out of specification condition is detected BIAS OUTSIDE LIMIT REF OUTSIDE LIMIT 5SUP OUTSIDE LIM
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