TABLE OF CONTENTS 1.0 DESCRIPTION
Contents
1. 13 Communication Protocol ie segues bee ex P uhaq 13 Information Transfer Protocol eae eee nage eed eade eue exe geo 13 Command SIUCHIWI uuu eee RIS ge 13 Commands de e eee aet re ehe e due 13 Probe Outp t ane ERIGI eO E D Ege e RE REP E 15 APPENDIX C FP4000 QUICKBASIC EXAMPLE COMMUNICATIONS PROGRAM 16 QuckBasic Code erento seu iue 16 8 0 SCHEMATICS c ais 17 FP4000 PAGE 1 of 30 10 DESCRIPTION Introduction The FP4000 is a battery operated broadband radio frequency RF isotropic electric field probe designed for use in making RF exposure measurements in the vicinity of broadcast facilities and industrial RF sources This probe uses optical isolation to minimize field perturbation during measurements The FP4000 probe measures field strength in each of three axes It performs a vector addition calculation on the readings and sends the result to the receiver via a fiber optic cable Data from each axis can be viewed individually or can be combined Frequency response of the FP4000 is 10 KHz to 1 GHz dynamic range is 1 to 300 Volts meter V m Figure 1 1 FP4000 Electric Field Probe FP4000 2 0 Dynamic Range Ranges Frequency Response2. 2 0 000000 6 Return Procedures ecd catechesi cec ta eret 6 Periodic Preventive 6 Parts Intotmatiors l tera ta G toe 6 6 0 THEORY OF OPERATION te oru iuda 8 8 System THEOLY bade meanest 8 Probe Operation rr 8 Probe Power Supply us na a ete RUD Rye e EORR de Ree PA 10 LRT OMS 10 7 0 APPLICATION CONSIDERA TION n u 11 Introduction kaya uy RE RE DEEP 11 Band Considerations u 11 Resolutions 11 Probe Support StFUCLIE6S 2564 Ta eT eee 11 APPENDIX A EPADOU ERROR CODES uuu u L n usasqa u Kusma u c soe esi ste 12 Probe Eror zu ki LEE E 12 APPENDIX B FP4000 OPERATING 8 13 2
3. Continue END IF PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines allows the operator to select which unit type REM to set the FP4000 to and sends the appropriate command REM Unit DO CLS PRINT PRINT PRINT PRINT Select a unit type PRINT FP4000 PRINT 1 V m PRINT 2 mW cmy PRINT 3 V m PRINT INPUT Selection 1 3 UnitChoice LOOP UNTIL UnitChoice gt 1 AND UnitChoice lt 3 CLS PRINT PRINT PRINT PRINT Setting unit type PRINT 1 U UnitChoice CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Unit INPUT 1 1 Result Result Unit LOOP IF INSTR Result E 0 THEN PRINT Unit set successfully ELSE PRINT An error has occurred in setting the unit INPUT Press Return to continue Continue END IF PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines let the operator select whether they want REM single readings or continuous data from the probe Currently REM the delay between readings is second but if more rapid readings REM are needed the sleep command may be replaced with a for loop like REM this FOR I 1 to X NEXT I REM where X is some number which may vary Note that too short of a REM delay will cause erratic program behavior and possible buffer REM overflow REM ReadData DO CLS PRINT
4. FP4000 NOTE Compiled executable version available upon request PAGE 17 of 30 APPENDIX C FP4000 QUICKBASIC EXAMPLE COMMUNICATIONS PROGRAM QuickBasic Code FP4000 Driver Version 1 0 REM REM the next lines open RS 232 for communication with FP4000 REM either or com2 REM DO CLS PRINT PRINT PRINT PRINT Com port configuration for FP4000 PRINT PRINT 1 COMI PRINT 2 COM2 PRINT INPUT Selection 1 2 ComSelect LOOP UNTIL ComSelect 1 OR ComSelect 2 SELECT CASE ComSelect CASE 1 OPEN COMI 9600 0 7 1 RS CSO0 DSO FOR RANDOM AS 1 CASE 2 OPEN COM2 9600 0 7 1 RS CSO DSO FOR RANDOM AS 1 END SELECT REM REM the next lines wake the FP4000 if it is currently in sleep REM mode and set the sleep timer to zero which disables REM the sleep timer REM PRINT PRINT PRINT PRINT Setting up FP4000 PRINT PRINT 1 SO CHR 13 SLEEP 1 PRINT 1 SO CHR 13 SLEEP 1 PRINT 1 SO CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Sleep INPUTS 1 1 Result Result Sleep FP4000 PAGE 18 of 30 LOOP WIDTH 1 255 REM REM The main menu lets you choose from the diagnostic routine or REM the simple driver that takes data etc REM MainMenu DO DO CLS PRINT PRINT PRINT PRINT FP4000 Main Menu PRINT PRINT 1 Diagnostics PRINT 2 FP4000 Driver PRINT INPUT Selection 1 2 or
5. Linearity Isotropicity Overload Withstand Environmental Operating Temperature Humidity Fiber Optic Cable Connector Battery Battery Charger Probes Probe Mount Weight Optional Equipment PAGE 2 of 30 FP4000 SPECIFICATIONS 1 to 300 Volts meter V m 10 30 100 300 Volts meter full scale 10 KHz to 250 MHz 0 5 dB 250 MHz to 1 0 GHz 1 0 dB 0 5 dB full scale F S 2 least significant bits LSBs of A D converter 0 5 dB 1000 Volts meter maximum all ranges 10 C to 40 C 50 F to 104 F 5 to 95 relative humidity non condensing Standard FEMA 3 6 VDC 1400 mA h rechargeable Nicke Cadmium NiCd 110 220 VAC 16 hour 64 mm 2 5 in cube with probe shields on three sides 14 20 UNC tapped hole internal thread in base of probe 0 4 Kg 14 oz See Table 5 1 FP4000 PAGE 3 of 30 3 0 ACCEPTANCE AND CONTROLS Introduction This section contains information on unpacking and acceptance of the FP4000 probe probe controls probe connectors the battery and bench testing the battery charger Unpacking and Acceptance Step 1 Upon delivery of your order inspect the shipping container s for evidence of damage Record any damage on the delivery receipt before signing In case of concealed damage or loss retain the packing materials for inspection by the carrier Step 2 Remove the probe from its shipping containers Save the boxes and any protective packing materials for future
6. Q uit MainChoice LOOP UNTIL MainChoice 1 OR MainChoice 2 OR MainChoice Q OR MainChoice q SELECT CASE MainChoice CASE 1 GOSUB Diagnostics CASE 2 GOSUB DriverMenu CASE Q GOTO Quit CASE q GOTO Quit END SELECT LOOP UNTIL MainChoice OR MainChoice q REM REM The diagnostic routine sends various commands and requests REM responses to ensure that the FP4000 is working correctly and REM if errors are encountered provides information about where REM the problem may be occurring REM Diagnostics CLS DiagnosticErrorCount 0 PRINT PRINT Testing REM The next lines sends the command to receive battery REM voltage and reads the serial port to ensure that the REM correct response was given by the FP4000 REM PRINT 1 B CHR 13 PRINT Battery Voltage SLEEP 1 Result DO WHILE NOT EOF 1 Voltage INPUTS 1 1 Result Result Voltage LOOP IF INSTR Result 0 THEN FP4000 PAGE 19 of 30 COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF REM REM The next lines test the temperature request command REM PRINT 1 TC CHR 13 PRINT Temperature S SLEEP 1 Result DO WHILE NOT EOF 1 Temperature INPUTS 1 1 Result Result Temperature LOOP IF INSTR Result T 0 T
7. 2 UCASES XAxis INPUT Y axis YAxis YAxis UCASES Y Axis INPUT Z axis ZAxis ZAxis UCASE ZAxis CLS PRINT PRINT PRINT PRINT Enabling disenabling axes PRINT AxisSend A XAxis YAxis ZAxis PRINT 1 AxisSend CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Axis INPUT 1 1 Result Result Axis LOOP PAGE 25 of 30 FP4000 PAGE 26 of 30 IF INSTR Result E 0 THEN PRINT Axes enabled disabled successfully ELSE PRINT An error has occurred in enabling disabling axes INPUT Press Return to continue Continue END IF PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines allows the operator to choose which range REM to set the FP4000 to and sends the appropriate command REM Range DO CLS PRINT PRINT PRINT PRINT Select FP4000 range PRINT PRINT 1 2 3 4 or N ext range INPUT Selection 1 4 or N RangeChoice LOOP UNTIL RangeChoice gt 1 AND RangeChoice lt 4 OR RangeChoice n OR RangeChoice N CLS PRINT PRINT PRINT PRINT Setting range PRINT PRINT 1 RangeChoice CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Range INPUTS 1 1 Result Result Range LOOP INSTR Result E 0 THEN PRINT Range selected successfully ELSE PRINT An error has occurred in selecting the range INPUT Press Return to continue
8. LOOP PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Unit INPUT 1 1 Result Result Unit LOOP IF INSTR Result MW2 0 THEN ErrorFlag END IF PRINT 1 U1 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Unit INPUTS 1 1 Result Result Unit LOOP PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Unit INPUTS 1 1 Result Result Unit LOOP IF INSTR Result V 0 THEN ErrorFlag END IF IF ErrorFlag 1 THEN COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF PRINT REM REM the next lines determines if any errors were encountered REM and displays the appropriate information REM IF DiagnosticErrorCount 0 THEN PRINT This FP4000 appears to be working normally ELSE PRINT Please write down this information and contact your local PRINT representative or the Customer Service department at PRINT Amplifier Research Refer to your FP4000 manual for that PRINT information END IF FP4000 PRINT INPUT Press Enter to return to the Main Menu Continue RETURN REM REM the following lines display the choices available if the REM selection for the driver was chosen and processes the chosen REM selection REM DriverMenu DO DO CLS GOSUB InitVar PRINT PRINT
9. PRINT PRINT PRINT 1 Single sample PRINT 2 Continuous samples PRINT INPUT Selection 1 2 ReadChoice LOOP UNTIL ReadChoice 1 OR ReadChoice 2 CLS PRINT PRINT PRINT PRINT Reading field measurement from 4000 PRINT SELECT CASE ReadChoice CASE 1 PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 PAGE 27 of 30 FP4000 ReadData INPUTS 1 1 Result Result ReadData LOOP PRINT Reading from FP4000 Result CASE 2 DO PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 ReadData INPUT 1 1 Result Result ReadData LOOP LOCATE 6 1 PRINT Reading from FP4000 Result PRINT Press ESC to stop readings LOOP UNTIL INKEY CHR 27 END SELECT PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines allow the operator to type a number in seconds REM of inactivity that the FP4000 will wait before entering sleep mode REM SleepTimer CLS PRINT PRINT PRINT PRINT Sleep Timer PRINT PRINT Enter time in seconds to wait for a command before INPUT putting the probe into sleep mode SleepTime CLS PRINT PRINT PRINT PRINT Setting sleep timer PRINT PRINT 1 S SleepTime CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Sleep INPUTS 1 1 Result Result Sleep LOOP IF INSTR Result E 0 THEN PRINT Sleep timer set su
10. PRINT PRINT FP4000 Driver Menu PRINT PRINT Read battery voltage PRINT 2 Read temperature PRINT 3 Zero PRINT 4 Axis enable disable PRINT 5 Set range PRINT 6 Set unit type PRINT 7 Read probe data PRINT 8 Set sleep timer PRINT 9 Set baud rate PRINT Q Quit PRINT INPUT Selection 1 9 DriverChoice PAGE 23 of 30 LOOP UNTIL DriverChoice gt 1 AND DriverChoice lt 9 OR DriverChoice OR DriverChoice q SELECT CASE DriverChoice CASE 1 GOSUB Battery CASE 2 GOSUB Temperature CASE 3 GOSUB Zero CASE 4 GOSUB AxisEnable CASE 5 GOSUB Range CASE 6 GOSUB Unit CASE 7 GOSUB ReadData CASE 8 GOSUB SleepTimer CASE 9 GOSUB BaudRate END SELECT LOOP UNTIL DriverChoice OR DriverChoice q RETURN REM REM the following lines request and display the battery voltage FP4000 REM Battery CLS PRINT PRINT PRINT PRINT Requesting battery voltage from 4000 PRINT Send battery volt request to FP4000 PRINT 1 B CHR 13 SLEEP 1 PRINT Battery Voltage Result DO WHILE NOT EOF 1 Voltage INPUTS 1 1 Result Result Voltage LOOP PRINT Result PRINT PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines request and display the temperature REM Temperature DO CLS PRINT PRINT PRINT PRINT Request temperature PR
11. use Step 3 Check all materials against the packing list to verify that the equipment received matches that which was ordered If you find any discrepancies note them and call Amplifier Research Customer Service for further instructions Be sure that you are satisfied with the contents of your order and the condition of your equipment before installing the probe Probe A switch two fiber optic connectors and a battery charger connector are mounted on the FP4000 probe housing Figure 3 1 XMIT RCV The fiber optic cable assembly from the receiver is attached to the probe via two connectors The cable ends are color coded white for XMIT yellow for RCV Identically colored dots are located on the probe housing adjacent to these connectors Be sure that each cable is attached to the proper probe connector Figure 3 1 Switch and Connectors When the cables are not attached always cover the probe connectors with the protective plastic covers supplied with the unit or with similar material This prevents dirt and other contaminants from entering the connector causing communication problems FP4000 PAGE 4 of 30 ARM OFF The ARM OFF switch activates and deactivates the probe In the ARM position the probe is powered by its internal 3 6 VDC NiCd battery in the OFF position the probe is inactive To prolong battery life set this switch to OFF when the probe is not in use CHARGER Amplifier Research BC2002 1 hour Fast Charger is su
12. HEN COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF REM REM The next lines test the zeroing command REM PRINT 1 Z CHR 13 PRINT Zero s SLEEP 1 Result DO WHILE NOT EOF 1 Zero INPUTS 1 1 Result Result Zero LOOP IF INSTR Result E lt gt 0 THEN COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF REM REM The following lines set the X Y and Z axis to a FP4000 PAGE 20 of 30 REM particular setting then checks to see if what was REM expected happened This is then repeated with a REM different value and rechecked REM ErrorFlag 0 AxisSend ADDD CHR 13 PRINT Axis s PRINT 1 AxisSend SLEEP 1 Result DO WHILE NOT EOF 1 Axis INPUT 1 1 Result Result Axis LOOP PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Axis INPUTS 1 1 Result Result Axis LOOP IF INSTR Result DDD 0 THEN ErrorFlag END IF AxisSend PRINT 1 AxisSend CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Axis INPUTS 1 1 Result Result Axis LOOP PRINT 1 D2 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Axis INPUT 1 1 Result Result Axis LOOP IF INSTR Result EEE 0 THEN E
13. INT PRINT 1 Temperature in Celsius PRINT 2 Temperature in Fahrenheit PRINT INPUT Selection 1 2 TempChoice LOOP UNTIL TempChoice 1 OR TempChoice 2 CLS PRINT PRINT PRINT PRINT Requesting temperature from FP4000 PRINT Send temperature request to FP4000 SELECT CASE TempChoice CASE 1 PRINT 1 TC CHR 13 SLEEP 1 CASE 2 PRINT 1 TF CHR 13 SLEEP 1 END SELECT PRINT Temperature Result DO WHILE NOT EOF 1 Temperature INPUTS 1 1 Result Result Temperature LOOP PRINT Result PRINT PRINT PAGE 24 of 30 FP4000 LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines send the zero command to the FP4000 REM Zero CLS PRINT PRINT PRINT PRINT Zeroing FP4000 PRINT 1 Z CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Zero INPUTS 1 1 Result Result Zero LOOP INSTR Result E 0 THEN PRINT FP4000 zeroed successfully ELSE PRINT An error has occurred in zeroing the FP4000 END IF PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines allow the operator to enter enable or REM disable commands for each axis and sends the corresponding REM command to the FP4000 REM AxisEnable CLS PRINT PRINT PRINT PRINT Type E for enable for disable PRINT INPUT X axis XAxis XAxis
14. TABLE OF CONTENTS 1 0 DESCRIPTION 1 Introductio 5 2 soe Beis Su ote det ae 1 2 0 FP4000 SPECIFICATIONS 1 uu edit oder bh Quest ended qu dee 2 3 0 ACCEPTANCE AND 3 Inttoduction y aet deter T ec rd eei een esit e S 3 2 2 ne rye be eterne pne s etae 3 NR Uc Nese en 3 XMIT RCV i hot heeft cv Nea dave he Baad seid een Ee tied ico Fiol eee 3 u eS UN ON xta eisque ULL 3 CHARGER uibem bete tineis decime ef erf UNI eos 4 ee e RR Ensure S te YR RE Pe RR E de oe e eR TE 4 Battery Charger Bench pests aaa uama oer e eU a ee 4 4 0 BATTERY CHARGING rca u unun utu etudes D eee fuk bal ses 5 IntrOGuCtiOD u la t et rete eet uie e ere ete de dette ALA SERIE td e de Regest 5 Charging Procedure ceo es ett esce en Ren Ie de EE Tela duce e ERR T e a EN CEDE ex 5 Battery EE 5 5 0 MAINTENANCE tan drei o eub es UO f adu Me s h 6 IntrOd Ccti D s u teet d cette testet ete ue eee ear eret eon da eee ee a ceu 6 Maintenance Recommendations
15. ad the battery voltage and temperature sensing lines An entire A D cycle therefore consists of eight readings The eight readings from the A D converter are input to the microprocessor which performs a vector sum calculation on the X Y and Z channels This data is transmitted Probe Power Supply The probe is powered by a sealed rechargeable 3 6 VDC NiCd battery which drives both the analog and digital power supplies the FP4000 employs separate power sources to provide isolation between the analog and digital circuitry With the probe switch in the ARM position voltage from the battery is applied to the power switch This switch routes the battery voltage to the power supply enabling the microprocessor The power switch is controlled by a timer circuit The timer monitors the fiber optic connector input line to determine whether the probe has received a command during a specified period several seconds If no command is received during this period the timer signals the power switch to disable the power supply and the microprocessor In essence the probe goes dormant to conserve battery power only the fiber optic input circuitry remains active in order to detect new commands When the next command reaches the probe power is reapplied automatically and the processor is reactivated waking up the probe NOTE The probe uses volatile random access memory RAM If for any reason power to the probe is lost the probe must be re zeroed Z
16. ating life The following tips advise you how to take advantage of these characteristics to get the most out of your probe s battery Although NiCd batteries are rated for operation in temperatures from 20 C to 65 C 4 F to 140 operating the probe in extreme temperatures will reduce operating time significantly The optimum operating temperature range for these batteries is 20 C to 30 C 68 F to 86 F The battery in the FP4000 does not require periodic deep discharges to reverse the capacity depleting memory effect caused by repeated shallow discharges however undercharging can reduce battery capacity Therefore after the charging procedure is complete be sure that the battery is fully charged before resuming field operation If the battery exhibits low terminal voltage during charging or if it appears unable to acquire or maintain an appreciable charge individual cells in the battery may be shorted or damaged If for any reason your battery needs replacement contact Amplifier Research Customer Service for assistance FP4000 PAGE 6 of 30 5 0 MAINTENANCE Introduction This section explains which maintenance tasks can be performed by the user It also provides information regarding replacement and optional parts If you have any questions concerning probe maintenance consult Amplifier Research Customer Service Maintenance Recommendations Maintenance of the FP4000 is limited to external componen
17. ccessfully PRINT A setting that is too low will cause erratic PRINT program behavior A reccommended setting is PRINT around 100 ELSE PRINT An error has occurred in seeting the sleep timer INPUT Press Return to continue Continue GOTO SleepTimer END IF PRINT PAGE 28 of 30 FP4000 LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines allow the operator to choose between a baud REM rate of 2400 or 9600 for the next power up Note that this program REM opens the serial port for 9600 baud so if 2400 is desired the REM OPEN statement in the setup routine at the beginning of this REM program must be modified to accomodate for the baud rate change REM BaudRate DO CLS PRINT PRINT PRINT PRINT Select a baud rate PRINT PRINT 1 2400 PRINT 2 9600 PRINT INPUT Selection 1 2 BaudChoice LOOP UNTIL BaudChoice gt 1 AND BaudChoice lt 2 CLS PRINT PRINT PRINT PRINT Setting baud rate PRINT 1 C BaudChoice CHR 13 Result DO WHILE NOT EOF 1 Baud INPUTS 1 1 Result Result Baud LOOP INSTR Result 0 THEN PRINT Baud rate set successfully PRINT Note that the baud rate does not change until the PRINT FP4000 has been powered down turned off let sit PRINT for at least 10 seconds and then powered up again PRINT Also note that this program con
18. cur The specified upper operating limit is 1 GHz Above this frequency the dimensions of the probe body itself become appreciable in relation to wavelength this makes the behavior of the FP4000 unpredictable above 1 GHz Responses to frequencies up to 6 GHz must be compensated for when zeroing the probe Resolution Limitations Limitations in system resolution may result in a non zero reading when the receiver is zeroed If this occurs it does not necessarily mean that your readings are inaccurate Probe linearity is specified as 0 5 dB full scale in addition the variance of the probe s A D converter is 2 least significant bits When using the most sensitive range 10 V m these specifications create the possibility that under zero field conditions the receiver may display a non zero value Probe Support Structures It is very important to keep conductive objects away from the FP4000 Any such objects in the proximity of the probe may distort the near field and compromise measurement accuracy If your application requires measurements from a fixed position always mount the probe on a non metallic platform using non metallic screws FP4000 PAGE 13 of 30 APPENDIX A FP4000 ERROR CODES Probe Error Output If an error occurs the probe will respond with one of the following strings These strings begin with a colon and end with a carriage return E01 Communication error e g overflow E02 Buffer full error Too many characters c
19. eans enable x D means disable xxx order is X axis Y axis Z axis B Read battery voltage Cx Set baud rate 1 sets rate to 2400 baud x 2 sets rate to 9600 baud Note that the baud rate does not change until the FP4000 has been powered down turned off let sit for at least 10 seconds and then powered up turned on again Dx Read probe data x 1 enables short form output FP4000 PAGE 15 of 30 x 2 enables long form output Rx Set range x 1 2 3 4 or N next range Sx Sleep timer x number of seconds to wait for a command before putting the probe into the sleep mode In the sleep mode the FP4000 changes to a low power mode which increases battery life In the sleep mode the probe can only recognize the receipt of a command it cannot recognize a command The first command sent when the probe could be in a sleep mode may be an ASCII null character or any command Following the receipt of this Wakeup character a command can be sent to which the probe will respond Tx Read Temperature x C or F Ux Set unit type 1 2 3 or N next unit 1 V m 2 mW cm2 3 V m Z Zero Null Send the ASCII null character This is a special command that can be used as the initial command to the probe after it is turned on The probe responds with N NOTE When remotely operating the probe using commands manually entered from a computer keyboard the FP4000 may go to sleep between commands This may be noted wh
20. en the Sleep Timer is set to a short interval such as one or two seconds When this happens the probe may seem to be unresponsive to commands or may seem to skip commands If this condition is observed send an SO command and keep sending the command as fast as possible until the probe responds S and the sleep timer is turned off Now the probe will respond in the proper manner FP4000 Probe Output Command B D1 D2 TF TC PAGE 16 of 30 FP4000 Response Bxx xx where xx xx is the battery voltage Dxx xxuuu the short form output xx xx is the reading The position of the decimal point depends upon the range setting of the FP4000 uuu units _V_ V m mW2 mW cn _V2 V m 2 underscore indicates a space character Dxx xxuuurrrobaaat the long form output the reading as described for D1 uuu units as describe for D1 recorder out value A 3 digit ASCII number from 0 to 255 over range indicator N ok over range b battery status N safe operating level W warning level fail level aaa axis enable E enabled D disabled Axis order is X Y Z t terminating carriage return Rx where x is the range x returns the range currently in use x 1 2 3 4 enables the selected range x N sets the probe to the next higher range Txxx where xxx is temperature in Fahrenheit Txxx where xxx is temperature in Centigrade
21. eroing When the zero command is sent the probe must be in a zero field environment This is because the zero command causes the multiplexer via the processor to perform a normal read cycle on all axis signals This procedure is executed for all 24 ranges four ranges three axes per range two antennas per axis When the processor receives all the zero field signal values it stores them in a special register these values are subtracted from all subsequent measurements Therefore a probe which is zeroed while it is not in a zero field environment will give erroneous readings FP4000 PAGE 12 of 30 7 0 APPLICATION CONSIDERATIONS Introduction The following subsections contain information designed to help you maximize the effectiveness of the FP4000 probe Out of Band Considerations Although the specified operating range of the FP4000 is from 10 KHz to 1 GHz it responds to signals both above and below these frequencies Such responses must be taken into account when performing certain operations such as zeroing On the low frequency end the FP4000 is specified to operate down to 10 KHz however the probe can exhibit some response to frequencies as low as 50 60 Hz Such an out of band response poses a problem when zeroing the unit since this operation obviously assumes a zero field condition Therefore when zeroing the user must compensate accordingly for any low frequency out of band response At the upper end similar problems can oc
22. figures the serial PRINT port to communicate at 9600 baud If you wish to PRINT operate the FP4000 at 2400 baud you will need to PRINT Change the OPEN statement to be as follows PRINT OPEN COM1 2400 0 7 1 RS CD0 DSO ELSE PRINT An error has occurred in setting the baud rate INPUT Press Return to continue Continue GOTO BaudRate END IF PRINT LOCATE 24 1 INPUT Press Return to continue Continue RETURN REM REM the following lines initialize sever program variables REM Init Var MainChoice PAGE 29 of 30 FP4000 PAGE 30 of 30 Result Voltage TempChoice Temperature Zero 2 XAxis YAxis ZAxis AxisSend RangeChoice Range UnitChoice Unit ReadChoice ReadData SleepTime Sleep BaudChoice Baud RETURN REM REM the following lines close the serial port and end the program REM Quit CLS CLOSE END FP4000 PAGE 31 of 30 8 0 SCHEMATICS
23. nal monopole antennas are used to provide an isotropic response to the ambient field The probe uses two antennas per axis one each for high and low frequencies to receive RF signals The signals are fed to a Schottky diode detector low frequency signals are preamplified first After filtering and amplification the high and low frequency signals generated by each axis a total of six signals are fed into the multiplexer The microprocessor instructs the multiplexer to look at each of the six axis signals sequentially A time division output signal from the multiplexer is fed into the programmable gain stage The programmable gain stage provides the required amplification factors for the high and low frequency signals on each range The system uses four ranges 10 30 100 and 300 V m each range requires both a high and low frequency gain setting eight amplification factors in all For example assume the probe is making measurements using the 100 V m range When the multiplexer selects the low frequency X axis signal the microprocessor directs the programmable gain stage to use the appropriate amplification factor for this signal This process is repeated for the next signal sample X high as well as for the four remaining axis signals The output of the gain stage feeds the multiplexed front end of the analog to digital A D converter After stepping through all six axis signals the microprocessor commands the multiplexed A D front end to re
24. ontained between the Start Character Carriage Return sequence E03 received command is not valid E04 The received parameter is not valid E05 Hardware error e g EEPROM failure E06 Parity error FP4000 PAGE 14 of 30 APPENDIX B FP4000 OPERATING PROTOCOLS Introduction The information in this appendix assumes that you have purchased the optional IF4000 Fiber Optic RS232 Interface and are capable of communicating directly with the FP4000 probe Communication Protocol Data Type RS 232 Serial Data Mode Asynchronous Word Length 7 bit Parity Odd Stop Bits 1 Data Rate 9600 baud Information Transfer Protocol The FP4000 operates as a Controller Mode device It only responds to commands from another device it transmits no data without first receiving instructions to do so Command Structure A command to an FP4000 probe consists of 1 a command letter followed by 2 possible parameters 3 terminated with a carriage return When it completes the command the FP4000 responds with a string consisting of 1 a start character 2 the command letter followed by 3 data if required and terminated with 4 a carriage return If the command does not require the probe to return any data the probe simply responds with the command letter and a carriage return If an error occurs the probe responds with an error code as detailed in Appendix A Commands Command Description AXxx Axis enable disable x E m
25. pplied with the FP4000 The Amplifier Research BC2002 manual details the specifications and use of this product Battery The NiCd battery provides up to 40 hours of probe operation when fully charged FP4000 PAGE 5 of 30 40 BATTERY CHARGING Introduction Each FP4000 probe contains a rechargeable nickekcadmium NiCd battery A fully charged battery nominal output voltage of 3 6 VDC provides up to 40 hours of operation When the battery has discharged to 3 3 VDC the probe is still operational but its battery needs charging when the voltage drops below 3 18 VDC measurement accuracy will be compromised by further operation NOTE Amplifier Research charges the internal NiCd battery of the FP4000 at the factory in order to calibrate the probe prior to shipment While every effort is made to ensure that your probe arrives ready to use we cannot guarantee that this will be the case Always check the condition of the probe s battery prior to making any measurements Charging Procedure Step 1 Verify that the battery charger is set correctly for the AC voltage in your area Step 2 Plug the charger into a suitable AC source Step 3 Set the probe switch to OFF Insert the plug on the charger cable into the probes CHARGER jack The indicator on the charger lights up only when a probe is connected Step 4 The battery is now charging Battery Tips NiCd batteries have several characteristics that can affect both their performance and oper
26. rrorFlag 1 END IF IF ErrorFlag 1 THEN COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF REM REM These next lines checks the range setting capability REM with a similar method to the above routine for the axes FP4000 PAGE 21 of 30 REM PRINT 1 R2 CHR 13 PRINT Range s SLEEP 1 ErrorFlag 0 Result DO WHILE NOT EOF 1 Range INPUTS 1 1 Result Result Range LOOP PRINT 1 R CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Range INPUTS 1 1 Result Result Range LOOP IF INSTR Result R2 0 THEN ErrorFlag 1 END IF PRINT 1 R1 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Range INPUTS 1 1 Result Result Range LOOP PRINT 1 CHR 13 SLEEP 1 Result DO WHILE NOT EOF 1 Range INPUTS 1 1 Result Result Range LOOP INSTR Result R1 0 THEN ErrorFlag END IF IF ErrorFlag 1 THEN COLOR 4 0 0 PRINT ERROR COLOR 7 0 0 DiagnosticErrorCount DiagnosticErrorCount 1 ELSE COLOR 2 0 0 PRINT OK COLOR 7 0 0 END IF REM REM These next lines check the unit type setting command REM ErrorFlag 0 PRINT 1 U2 CHR 13 PRINT Unit Type SLEEP 1 Result FP4000 PAGE 22 of 30 DO WHILE NOT EOF 1 Unit INPUT 1 1 Result Result Unit
27. specified packaging materials for return shipment YOU WILL BE BILLED FOR THE NEW PACKAGING If the probe is still under warranty refer to the Limited Warranty in this manual for additional information about your return Periodic Preventive Maintenance Amplifier Research recommends an annual calibration check of the FP4000 probe to verify that it is performing within specifications This calibration check may be performed by Amplifier Research Contact Amplifier Research Customer Service 215 723 0275 for price scheduling and shipping information FP4000 PAGE of 30 Parts Information Use the following table Table 5 1 for ordering replacement or optional parts for the FP4000 Table 5 1 Replacement Optional Parts List Parts 110 240 Volt BC2002 FP4000 User s Manual 1007506 Cable Fiber Optic Glass 10 Meter 1004602 501 FP2010 Probe Stand Assembly PS2000 1005800 501 Fiber Optic RS232 Interface IF4000 1007449 501 FP4000 PAGE 8 of 30 6 0 THEORY OF OPERATION Introduction This section discusses the theory of operation and the functions of the FP4000 Isotropic Electric Field Probe A high level block diagram Figure 6 1 is included to aid the discussion The objective is to provide information that enhances the user s understanding of the design of this probe For detailed information on specific circuits refer to the schematic diagram at the back of this manual System Theory The FP4000 Isotropic Elec
28. tric Field Probe utilizes a microprocessor for intelligent operation and control The probe s self contained power supply employs a 3 6 VDC NiCd battery which provides up to 40 hours of continuous operation For each axis the probe measures the radio frequency signal level and generates a linearized reading of the measurement A vector addition is performed on these three readings the resultant is transmitted to the receiver over glass fiber optic cables The probe provides data via either a short form or long form output word See Appendix B for details on both output word formats Probe Operation Receiver commands to the probe consist of the following Send reading Read battery voltage Zero Set sleep timer e Change range Read temperature Enable disable axis The signal flow within the probe is shown in the block diagram FP4000 PAGE 9 of 30 PAGE 10 of 30 FP4000 Alddns Hd3MOd S39Vl10A 901VNV S A SOSN3S g K_IOYINDD 2 424 NOud ONYNWNWOO S X _ d j viva 2 43A393M OL d QHOM vc ANJ3LINH Wuvo 9330 HOLIMS Y4aMOd HOSN3S di 3 SIXVv HOV3 NO SIIYONIO LNV N 8 JIEVNNVYSOdd Probe Block Diagram Figure 6 1 FP4000 PAGE 11 of 30 To measure field strength three sets of mutually orthogo
29. ts such as cables or connectors Any calibration or maintenance task which requires probe disassembly should be performed at the factory Check with Amplifier Research Customer Service 215 723 0275 before opening the unit to avoid problems with your probe s warranty NOTE Opening the probe enclosure may void your warranty If your system is under warranty contact Amplifier Research Customer Service before performing any maintenance inside the probe Return Procedures To return a probe to Amplifier Research use the following procedure Step 1 Briefly describe the problem in writing Give details regarding the observed symptom s and whether the problem is constant or intermittent in nature If you have talked previously to Amplifier Research Customer Service about the problem provide the date s the name of the service representative you spoke with and the nature of the conversation Include the serial number of the item being returned Step 2 Package the probe carefully Use the original boxes and packing materials if possible NOTE If your probe is calibrated in accordance with MIL Std 45662A it is greatly to your benefit to retain the original shipping box and packing materials One of the criteria for certifying a calibration to MIL standards requires Amplifier Research to always ship equipment in the specified packaging When a MIL Standard instrument is sent to Amplifier Research in other packaging we must replace it with the
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