Chauvin Arnoux C.A 43 User Manual Download Page 14

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MEASUREMENT MODE

Whatever the measurement mode, the sampling time is always 250µs. The table below

summarizes the measurement times of the various modes described in this chapter.

Measurement mode

Symbol

Digital measurement

time

Normal measurement

400 ms

Recording

(of MIN, MAX and AVG)

RECORD

400 ms

Smooth measurement

SMOOTH

4 s

Recording in smoothed values

RECORD SMOOTH

4 s

Peak measurement

PEAK

100 ms

Recording in peak values

RECORD PEAK

1 ms

HOLD

SMOOTH

The time required for updating analogue measurements shown by the bargraph is always 20ms.

HOLD THE DIGITAL DISPLAY

One press on allows you to hold the digital display on the last measurement dis-

played whilst the analogue display continues to indicate the instantaneous value of the

measurement. The display indicates

HOLD

. Pressing again resets the instrument

to instantaneous measurement mode and

HOLD

disappears from the display.

SMOOTH MEASUREMENTS

A first press on triggers smoothing of the measurement (

SMOOTH

displayed).

The digital value shown is then the result of a sliding average calculated over the last 10

measurements (i.e. approx 4 seconds).

The bargraph still shows the instantaneous measurement. A second press on

cancels the filter and the

SMOOTH

symbol disappears.

The smoothed measurement value is constantly calculated. This allows you to obtain the

result of the filtering as soon as the button is pressed.

MEASUREMENT OF "PEAK" VALUES

The

PEAK

function allows you to make measurements with an acquisition speed of 1ms for

peak measurements.

HOLD

Summary of Contents for C.A 43

Page 1: ... MESUREURDECHAMP LARGEBANDE WIDEBANDELECTRIC FIELDMETER BREITBANDIGER FELDSTƒRKENMESSER C A 43 FIELDMETER Moded Emploi User sManual Bedienungsanleitung FRANCAIS ENGLISH DEUTSCH ...

Page 2: ...in its accuracy class and to obtain optimum use we advise against leaving the C A 43 permanently exposed to fields higher than 300 V m or 100 A m TO ORDER Reference C A 43 FIELDMETER 1670 02 Meter EF2 isotropic probe supplied in a carrying case Supplied with the instrument 1 optical strap plastic fibre 10m 1 opto electric adaptor DB 25M 1 mode changer DB 25F DB 25F 1 reducer DB 25F DB 9F 1 EMIGRAP...

Page 3: ...emory 55 Access to several special functions 55 MEASUREMENT MODE 56 digital display 56 measurements 56 value measurements 56 average recording 57 On Off 59 MEMORY MODE 61 Manual memory 61 Automatic memory 61 Reading measurement memory 62 PRINT MODE 65 Manual printout 65 Automatic printout 66 PROGRAM MODE 66 Alarms t session clock rate 66 Writing a number 67 Special cases in µW cm 68 Rereading prog...

Page 4: ...ing the measurement memory 74 Reading the program memory 75 Fast reading of the memory 75 Example of rapid read 76 SOUND DEMODULATION 78 SPECIFICATIONS 79 Electrical specifications 79 Mechanical specifications 81 MAINTENANCE 82 Changing the battery 82 Cleaning 82 Maintenance 82 WARRANTY 83 APPENDIX 83 cont ...

Page 5: ...amming the sessions of t memorisation Setting the clock 6 button Smoothing measurements Switching On Off the display of the present time button Increase 7 button Recording MIN MAX and AVG Display of MIN MAX and AVG Switching On or Off the sound beep button Moving the programming digit to the left 8 Measurement probe connector 9 button Hold digital display Cancel auto Off P button Move programming ...

Page 6: ... Rate of automatic memorisation 18 Digital output or input in progress 19 Digital display of battery capacity clock t or scan duration 20 Log scale 21 Analogue display by 35 segment bargraph 22 Arrow indicating end of scale 23 Measurement unit in microWatts per cm 24 Measurement unit in Volts per metre 25 Measurement unit in Amps per metre 26 2000 count digital display 27 Digital measurement in sm...

Page 7: ...manent operation 34 Digital readout of the average value 35 Low battery indicator 36 Digital readout of the minimum value 37 Beep On 38 Digital readout of the maximum value 39 Hold the digital display 40 High alarm threshold crossed 41 High alarm function in operation 42 Low alarm threshold crossed 43 Low alarm function in operation ...

Page 8: ...c compatibility in accordance with the applicable standard The C A 43 is a small portable instrument that measures the electric field present in the atmosphere surrounding its measurement probe This probe consists of an aerial combined with a high frequency detector The wide passband of this unit enables the measurement of electrical fields from 0 1 V m to 200 V m for frequencies between 100 kHz a...

Page 9: ...ield emitted by a source of interference simply point the aerial towards it and get as close as possible the value of the field is inversely proportional to the distance of the sensor emission source To switch Off the instrument set the switch to Off the display goes blank Auto Off may be triggered if you have not turned the switch or pressed the buttons during 10 minutes of operation In this case...

Page 10: ... To do this press simultaneously when switching On with the rotary switch The P symbol is displayed indicating that the Fieldmeter is in permanent operation This cancellation of the Auto Off function is cancelled when the instrument is next switched Off switch to the OFF position Note Auto Off is automatically cancelled on RECORD mode and in certain cases on the SCAN function DEACTIVATING THE BEEP...

Page 11: ...bol being lit A colon is displayed between the hours and the minutes if it flashes this shows that the time displayed is the present time When it is continuously displayed this indicates that the time displayed is a set time corresponding to the moment when the displayed measurement was recorded To display the present time simultaneously press when you switch On with the rotary switch Similarly to...

Page 12: ...h threshold SCAN For the number of minutes of the Scan display HH MM t For the duration of the time interval expressed in hours minutes and separating two sets of data in the memory The unused characters are replaced by spaces Group 2 contains 5 characters lined up on the right indicating the programmed digital value with 4 digits plus possibly a decimal point The insignificant digits are replaced...

Page 13: ...usly on when switching On with the rotary switch and do not release until it is erased The MEM symbol lights up the message is continuously displayed top right for 3 seconds and the number of addresses available appears on the digital display After 3 seconds flashes once and a beep indicates that the memory has been erased The number of addresses available then changes to 1920 which is the maximum...

Page 14: ...s played whilst the analogue display continues to indicate the instantaneous value of the measurement The display indicates HOLD Pressing again resets the instrument to instantaneous measurement mode and HOLD disappears from the display SMOOTH MEASUREMENTS A first press on triggers smoothing of the measurement SMOOTH displayed The digital value shown is then the result of a sliding average calcula...

Page 15: ... than 2 seconds on sets the instrument to record mode the RECORD and P symbols light up MIN value As soon as has been pressed the value displayed is allocated to the MIN register Each time a measurement is less than that contained in the register it is transferred to the MIN register and a beep is emitted MAX value Similarly a measurement higher than the value contained in the MAX register will ca...

Page 16: ... MAX and AVG values already stored During the reading of the MIN MAX and AVG memories the recording of new minimum maximum and average values is taken into account It is impossible to memorise them manually pressing only displays the remaining memory capacity When the RECORD and SMOOTH symbols are displayed the smoothed values are recorded MIN MAX and AVG with a measurement constant of 4 seconds S...

Page 17: ...without reinitialising the memories one press on for more than 2 seconds cancels the record function Remark In normal measurement without recording so without RECORD symbol if after having pressed the user starts recording by pressing and if the readout of the contents of the MIN or MAX or AVG memories is needed during this HOLD the display will show three hyphens the contents of these memories wi...

Page 18: ...ment is below the low threshold the buzzer switches On and the low overhead symbol is lit on the display The digital measurement is above the high threshold the buzzer switches On and the high overload symbol is lit on the display The digital measurement is below the low threshold or above the high threshold with programmed value of the low threshold below the programmed value of the high thres ho...

Page 19: ... pressed the MEM symbol is displayed for one second and the digital display flashes once to indicate the storage operation If you continue to press the button the digital measurement is replaced by the number of the box for the address in the memory which has just been allocated then the current memory appears If the measurement memory is full the MEM symbol flashes for 2 seconds the error beep bu...

Page 20: ...ible in measurement mode for reading with the button are not memorised In fact these values do not correspond to the time chosen but to the total operating time of the recording mode since the first press on t see in MEASUREMENT MODE min max and average recording READ MEASUREMENT MEMORY Set the rotary switch to MR to read the different values in the memory MR is displayed on the screen Automatical...

Page 21: ...xi mum occurred The third address read whilst decreasing contains the parameters of the MIN measurement the clock gives the time when this minimum occurred If you continue to press the decrease button the display is scrolled more quickly The symbols and the digital values become illegible but the bargraph allows you to easily and quickly follow the evolution of the memorised values The decrease is...

Page 22: ...etween these two thresholds will be displayed During fast search the scroll function may straddle several different memorisation sequences involving different units In this case the scrolling stops at each change of unit and the alarms are deactivated If no threshold is programmed the button is inoperative and you must change to Programming mode to be able to set a threshold value Each time that a...

Page 23: ...tains the measurement symbol displayed Example of printout ___ 10 30 SMOOTH HOLD 12 3 V m ___ 09 30 PEAK MIN 1999 µW cm2 t 15 05 ___ AVG 12 57 A m During the duration of the transmission the COM and PRINT symbols are lit on the display the PRINT symbol indicates a demand for transmission the COM symbol indicates the effective output of the data On the read memory function press to send the content...

Page 24: ...gain automatically To interrupt the programmed sequence press a second time the COM and SCAN symbols disappear from the display During operation of the automatic printout function press one of the buttons or turn the rotary switch to interrupt the current print cycle the P and SCAN symbols disappear from the display PROGRAM MODE ALARM t SESSION CLOCK SCAN RATE Pressing the button on Measurement mo...

Page 25: ...m mode WRITING A NUMBER After having chosen the function to program the former value a number or three hyphens is displayed If three hyphens are displayed simply press or to display the minimum value 0 for the alarms 1mm for the clock t and SCAN Automatically the digit on the right flashes this is the active digit To increase the value of the active digit keep pressed in Likewise to reduce the val...

Page 26: ...e To do this simply return to measurement mode by pressing when these symbols are displayed SPECIAL CASE OF µW cm The programming of alarms in the case of µW cm measurements is distinguished by the possibility of suppressing or setting the decimal point whole number or decimal number To suppress the decimal point activate the digit on the right see previous paragraph Writing a number press again t...

Page 27: ...o read an average value which is more representative of the global field PEAK to identify the peaks some of which may exceed the maximum level that is wanted Example the peaks due to the closeness of a neon light are often greater than 3 V m and cannot be classed as level II in accordance with IEC 801 3 and IEC 1000 4 3 The PEAK function switches OFF the 50 Hz rejection filter for low frequency fi...

Page 28: ...vertical polarisa tion Consequently the reception diagram in the horizontal plane is circular In the vertical plane the reception diagram conforms to the pattern shown below When the field is perpendicular the sensitivity is at a maximum At 90 in relation to the vertical axis of detection the sensitivity is mi nimal Because of the anisotropy of the measurement probe during measurement in a given a...

Page 29: ...is then sent the output will start again at the point where it was interrupted in the same function But if a code corresponding to another message is sent to the instrument the output will start again in the new function requested If an OFF code is sent the instrument definitively exits the interrupted output mode At the end of each transmission an ASCII 4 code is emitted to indicate the end of th...

Page 30: ...The readout consists of sending a special code to the instrument If the code transmitted does not correspond to a code known by the letter the instrument sends the error code 4 ER 4 to the Tx output The output of the codes will start 100ms max after the last character applied to the RxD input As the digital link is not a true FULL DUPLEX the control commands can not be sent simultaneously with the...

Page 31: ...according to the functions of the instrument If during printout of the measurement the rotary switch is operated or a button is pressed the printout of the current message is terminated when the end of frame is sent Then the instrument sets itself to the new function requested READ THE STATE OF THE INSTRUMENT Codes to send to obtain the output of the state of the instrument regarding the alarms th...

Page 32: ... and A m sub assembly is divided into subgroups of 13 measurement points to define the different linearisations This latter information is only useful for decoding rapid measurements READ THE MEASUREMENT MEMORY For this read instruction to take effect the instrument must be in read memory mode otherwise the instrument sends back the code Error 2 ER2 Codes to send to obtain the output of the conten...

Page 33: ...m the operation of the rotary switch or pressing one of the buttons has no effect on the data output Only the OFF position stops the instrument RAPID READ OF THE MEASUREMENT This read instruction gives access to the measurement with a very short time constant This allows processing by peripheral computer To be taken into account this read instruction must be sent to the instrument when it is in Me...

Page 34: ...See in appendix the coding of the response transmitted EXAMPLE OF RAPID READOUT The followng Program allows you to make a rapid readout of 100 measurements at a rate of 100ms Measurement decoding is done in accordance with probe table 231 The language used is Turbo Basic cls p 0 dim X1 200 ìcretion of the data table gosub ROUTINE01 gosub ROUTINE02 print print Retrieval of 100 points see COM displa...

Page 35: ...6 F 6 143360 CF 6 1 294e 3 Q 6 14 360 return ROUTINE02 print setting up of RS232 on COM1 open COM1 1200 N 8 1 RS AS 1 return ROUTINE03 print 1 chr 34 if p 0 then A input 1 1 p 1 ìdelete the first byte A input 3 1 A left A 2 ìdelete 3 byte and keep the first two A1A2 asc left A 1 B1B2 asc right A 1 A1 fix A1A2 16 B1 fix B1B2 16 A2 A1A2 16 A1 B2 B1B2 16 B1 R B2 256 A1 16 A2 2 B1 80 gosub ROUTINE04 r...

Page 36: ...depth of 50 minimum As a result of the filtering constants of the instrument this function is only available on PEAK mode This function is controlled by a switch coupled to a single turn potentiometer 1 The potentiometer allows adjustment of the sound volume as a function of the field and the depth of modulation Note The power consumed by the internal speaker greatly reduces the service life of th...

Page 37: ...f 1999µW cm corresponding to a field of 86 8V m 2 Instrument only without probe 0 5 of the reading 0 2 of the range Error due to the interchangeability of sensors 0 5dB Reference conditions V m V m V m from V m from µW cm µW cm RANGE from 0 from 1 10 to 100 to from 0 1 to from 200 to to 1 V m to 10 V m 100 V m 199 9 V m 199 9µW cm 1999 µW cm 1 Resolution 0 1 V m 0 1 V m 0 1 V m 0 1 V m 0 1µW cm 1µ...

Page 38: ...Level of field allmagnitudes 0 5dB from 0 1 to 200V m All distortion from 0 to 50 C Thresholdof 0 2V m magnitudes from 10 to 90 RH alarmdetection of the programmed power supply from value 7 5 to 10V frequency from 1 MHz to 2 5GHz level from 0 1 to 200V m Variation in the operating range Adherence to standards Class III instrument IEC 1010 Electrostatic discharge IEC 801 2 and IEC 1000 4 2 Class of...

Page 39: ... capacity appears on the display of the C A 43 Saline batteries Lithium batteries and rechargeable accumulators are also accepted MECHANICAL SPECIFICATIONS Operating range Temperature 0 C to 50 C limited to 30 C for a humidity of 90 RH Relative humidity 10 to 90 RH no condensation Storage range Temperature 20 C to 60 C Relative humidity 10 to 95 RH no condensation Adherence to standards for the me...

Page 40: ...g the coin Check by switching On the instrument that the displayed time is not flashing If it is reset the time on the clock With the new battery the indication of the available battery capacity shown when the instrument is switched On may be greater than 100 CLEANING The case can be cleaned with any non abrasive and non acid product such as alcohol flugene etc MAINTENANCE Repair operations that m...

Page 41: ...the date at which the equipment is supplied The repair the modification or replacement of a part during the guarantee period will not extend the period of this guarantee APPENDIX CODING THE RESPONSE TO A RAPID READOUT OF THE MEASUREMENT The two bytes transmitted in response to a rapid instruction are coded according to a special law A byte comprises two digits coded in Hexadecimal called A1 A2 for...

Page 42: ...cient a is 1 893 x 10 3 i e 0 00163 and coefficient b is 7 300 the real measurement becomes 2802 4 x 0 001893 7 300 12 60V m Eachprobecodecontains6linearisationslopeswhosecoefficientsdependonthemeasurement The table below indicates the number of the linearisation table allocated to each of the 17 probe codes Probe code Linearisationtablenumber Measurementunit from 255 to 251 Measurementblocked Dis...

Page 43: ...art End Coeff a Coeff b 1 O ct 33 cts 4 666 10e 2 0 2 33 cts 250 cts 9 953 10e 3 1 211 3 250 cts 820 cts 5 438 10e 3 2 340 4 820 cts 2640 cts 3 022 10e 3 4 322 5 2640 cts 11776 cts 1 893 10e 3 7 300 6 11776 cts 143360 cts 1 294 10e 3 14 36 Coefficients of table 03 probe EF1 second sensitivity N straight line Start End Coeff a Coeff b 1 0 ct 33 cts 4 666 10e 2 0 2 33 cts 184 cts 1 298 10e 2 1 111 3...

Page 44: ...oeff a Coeff b 1 0 ct 27 cts 5 925 10e 2 0 2 27 cts 143 cts 1 207 10e 2 1 274 3 143 cts 572 cts 7 459 10e 3 1 933 4 572 cts 2048 cts 4 268 10e 3 3 758 5 2048 cts 8000 cts 1 889 10e 3 8 611 6 8000 cts 175104 cts 1 053 10e 3 15 37 As for the example taken before if the probe code is 227 use table 02 The value of the measurement in points is 2802 4 It falls in the extreme values of the fifth slope th...

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