Chauvin Arnoux C.A 43 User manual

■■
■■
■MESUREURDECHAMP
LARGEBANDE
■■
■■
■WIDEBANDELECTRIC
FIELDMETER
■■
■■
■BREITBANDIGER
FELDSTƒRKENMESSER
C.A 43
FIELDMETER
Moded'Emploi
User'sManual
Bedienungsanleitung
FRANCAIS
ENGLISH
DEUTSCH

48
SAFETY PRECAUTIONS
■Medical standards consider that electric fields greater than 60V/m can be dangerous to
persons. The user must therefore avoid remaining in close proximity to the instrument
when in an environment of this kind.
■Before making a measurement, as soon as the instrument is switched on, check that the
low battery symbol (35) is not shown on the display. If it is, change the battery.
■In the case of prolonged storage, it is preferable to remove the battery from the instrument.
■When the probe is fitted to the meter, avoid shaking the assembly, particularly in mea-
surement mode.
■In order to keep the instrument 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 EMIGRAPH software program
- 1 set of 5 adhesive labels, simplified Userís manuals (5 languages),
to stick to the back of the instrument
- 1 battery 9 V
- 1 User manual for the C.A 43 Fieldmeter.
Accessories :
- Shockproof case n∞10 ..................................................................................................................................... 2980.09
- EF1 probe (with vertical polarisation) .................................................................................................. 1672.01
Spare parts :
- EF2 probe (isotropic) ....................................................................................................................................... 1672.02
- EMIGRAPH software ....................................................................................................................................... 1672.05
- Optical strap (10m) ............................................................................................................................................ 1672.03
- Opto-electrical adaptor ................................................................................................................................... 1672.04
(with mode changer and reducer)

49
CONTENTS
DESCRIPTION 47
- Case 47
- Display 48
PRESENTATION 50
- General 50
- User manual labels 51
USE 51
SPECIAL FUNCTIONS 52
- Switching On permanent 52
- Switching Off the sound beep 52
- Displaying the present time 53
- Printing the program memory 53
- Erasing the program memory 55
- Erasing the measurement memory 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 programs 68
USING PROBES 68
- How to use 69
- EF2 probe 70
- EF1 probe 70
HOLD
SMOOTH
PEAK
MIN MAX
ALARM
SCAN

50
DIGITAL OUTPUT 71
REMOTE READ 72
- Reading the measurement 73
- Reading the state of the instrument 73
- Reading 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.)

51
CASE
1 - Sound demodulation control
2 - Optical connector, digital link
3 - 4 position rotary switch
4 - button
- Programming
- Initialisation of the program memory
5 - button
- Memorisation of the measurement
- Display of the memory address
- Display of the remaining memory capacity
- Initialisation of the measurement memory
- button
- Programming 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 digit to the right
10 - button
- Peak values, cancel 50Hz filter
- button
- Decrease
DESCRIPTION
PRGM
MEM
¥
SMOOTH
▼
▼
MIN MAX
HOLD
▼
PEAK
▼

52
11 - button
- On/Off alarm detection
- Selection of low and high alarms on programming
- Display of the alarms on re-reading measurement memory
12 - button
- Printout
- button
- Programming print rate.
DISPLAY
13 - Programming mode in operation
14 - Printout request mode
15 - Clock
16 - Cancel automatic memorisation
17 - 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 smoothed value
28 - Digital measurement in peak value
29 - Recording temporarily stopped
ALARM
PRINT
SCAN

53
30 - Re-read measurement memory mode
31 - Memorisation of measurements
32 - Recording MIN, MAX and AVG in operation
33 - Instrument in permanent 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

54
PRESENTATION
GENERAL
Pollution of the radio-electric environment is becoming more and more harsh, which leads to
problems of malfunctioning in many types of electronic equipment, especially since the use
of sequential logic and the development of microprocessors.
These modern techniques are used in practically all types of industrial equipment which makes
them particularly sensitive to interference and electromagnetic disturbances. The C.A 43
FIELDMETER allows the user to measure these levels of disturbance.
Measurements are of two types :
- Measurement of immunity
This measurement gives the value of the electromagnetic field in which equip-
ment is located, in order to check that this field does not exceed the permitted limits
in accordance with applicable standards.
- Measurement of emissivity
This measurement gives the value of the electromagnetic field emitted by
equipment which is switched ON, and consequently its class of electromagnetic
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 and 2.5 GHz.
The connection between the measurement probe and the base instrument is made via a
socket which allows the measurement probe to be removed during transportation.
The use of microprocessors for measurement, calculations and management of the display
makes the instrument simple to use and very accurate.
The large LCD comprises a 2000 count digital display, a logarithmic 35-segment bargraph and
a display of the different measurement symbols that provide easy reading for the user.
The bi-directional digital output via optical fibre permits access to all data for printing and
processing of measurements on an external processing unit. To allow you to do this, the
EMIGRAPH software program is supplied as standard with the C.A 43 Fieldmeter.

55
USE
Your Fieldmeter consists of a case and a probe. To connect it, simply position it in the axis
of the case, turn the probe and push it in. Lock in position by pulling the black ring on the probe
towards the case (multi-contact push-pull socket).
Never try to turn the probe when it is fitted to the case, you may cause damage
to the sensor and its connections.
To switch On the instrument, position the rotary switch to one of the On positions corres-
ponding to the type of measurement to make. The display makes a general self-test, then
shows (top right) the remaining service life as a % (150% maximum for a new battery), finally,
the result of the measurement is displayed with the appropriate symbol (measurement unit,
function...). Choose a special function if necessary by pressing the corresponding button
when switching On (See SPECIAL FUNCTIONS).
The measurement of the field is done by moving the aerial in the environment to be measured.
You obtain a direct wide band measurement of the field that the measurement sensor is
subjected to. To find the value of the field 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, if you want to wake up your Fieldmeter, simply press any button or turn
the switch (except to the OFF position). The display comes On again and the instrument starts
taking measurements again without taking into account the button pressed to wake it up.
After your measurements, position the switch to OFF and preferably put your Fieldmeter away
in its case. To do this, remove the probe by undoing the locking ring (in the axis, push the ring
of the case towards the probe) then carefully separate the two parts and put them away.
USER MANUAL LABELS
Five adhesive labels are supplied with your Fieldmeter. They are simplified reminders about
how to use your instrument. This information is available in five languages. Choose your label
and carefully stick it to the back of your instrument. Now you will always have the information
necessary to use your Fieldmeter.

56
SWITCHING ON PERMANENTLY
After 10 minutes of operation without pressing a button or turning the rotary switch or reading
the digital output, a battery economy system puts the instrument to sleep. This auto Off is
preceded by a beep and flashing of the digital display for one minute.
If you operate the instrument whilst it is flashing, the instrument will continue its active
operation for a further period of 10 minutes in the selected functions and without taking into
account the button pressed to wake it up. If you turn the switch the instrument will continue
to operate for a further 10 minutes.
To avoid your Fieldmeter setting to sleep mode every 10 minutes, you can cancel the Auto
Off function. To do this, press simultaneously when switching On with the
rotary switch. The Psymbol 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"
A buzzer, which is a piezo-electric chip, is used to indicate that the buttons are being pressed
and different functions used. The table below defines the frequencies and the lengths of the
beeps in all the functions of the instrument.
SPECIAL FUNCTIONS
FUNCTIONS
Press button X
Press button > 2s X
Buttoninoperative X
MIN recording X
MAXrecording X
Low alarm X
High alarm X
Alarms crossed X
Auto Off X
Memory X
4 kHz2 kHz1 kHz1 kHz2 kHz1 kHz4 kHz2 kHz
2 kHz
40 ms Continuous 65 ms 125 ms 250 ms
HOLD

57
These beeps can be suppressed if they seem too noisy to you. To do this, simultaneously
press as you switch On with the rotary switch. The disappearance of the
symbol from the screen shows that the beep is switched Off. This deactivation of the
beep will be continued even after the instrument is switched Off (switch to the OFF position).
To activate the beep function again, switch the instrument On again, whilst simultaneously
pressing .
DISPLAYING THE PRESENT TIME
A digital clock allows the display of the present time as well as the time of the different
recordings or memorisations.
This clock operates permanently, even when the instrument is asleep or completely switched
Off, which makes it possible to display the precise time as soon as the instrument is switched
On.
This clock displays hours and minutes in accordance with the international 24 hour standard.
When the time is displayed, the ¥symbol appears opposite the display of a session which
is announced by the ∆t symbol 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 cancel the display of the present time, you must switch Off
your instrument (switch to the OFF position) then simultaneously press whilst
turning the switch.
Notes :
When changing the battery, a reserve power supply ensures normal operation of the clock for
one minute.
If the power supply to the clock is cut, the clock displays 0:00 flashing for one minute, then
starts normal operation again from 0:01 (new present time).
PRINTOUT OF THE PROGRAM MEMORY
To print the contents of the program memory, press simultaneously when
switching On with the rotary switch (the PRINT symbol is displayed when pressed).
This command is active when the button is released. At this time, the PRINT symbol
disappears while the COM symbol appears indicating transmission.
MIN MAX
SMOOTH
MIN MAX
SMOOTH
PRINT

58
This is done via the TxD output by a series of data consisting of three groups of four lines, giving
the four values programmed for each measurement unit. At the end of this transmission the
instrument returns to the measurement function and the COM symbol disappears.
The presentation of the results is done in superimposed lines, each line corresponds to a
programmed function.
Each line contains three groups of data separated by a space and ends with a carriage return
and paper advance.
<group 1> <group 2> <group 3>
Group 1 contains 4 characters lined up on the left, indicating the programmed function. They
are given in the following order :
LO AL: For the low threshold
HI AL : For the high 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 by spaces.
Group 3 contains 6 characters lined up on the left, indicating the different programming units,
they are output in this order :
V/m
A/m
µW/cm≤
SCAN and ∆∆
∆∆
∆tare expressed in hours, minutes.
The separation between each unit is done by advancing by one line.
The unused characters are replaced by spaces so that the group is always the same length.
If the values are not programmed they are indicated by three hyphens - - - .
During data output, the COM and PRINT symbols are shown on the display.

59
When the instrument is switched On during initialisation of the program, the instrument may
send false data to the serial output, symbolised by the code "error 4" (ER4).
ERASING THE PROGRAM MEMORY
To initialise the programme memory, press simultaneously when switching On
with the rotary switch and continue to press until it disappears.
The PRGM symbol appears, the message is continuously displayed on the digital
display, for 3 seconds, then it flashes once and a beep indicates that the memory has been
erased.
Note :
Before the beep you can release the button at any time. In this case, it will not be
erased.
ERASING THE MEASUREMENT MEMORY
To initialise the measurement memory, press simultaneously 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
capacity of the memory.
Note :
Before the beep you can release the button at any time. In this case, it will not be
erased.
ACCESS TO SEVERAL SPECIAL FUNCTIONS
As applicable, it may be useful to cancel the Auto Off(1) and beep functions(2). To do this, press
(1)
, when switching On with the rotary switch, then press
(2)
before releasing
the first button. This method allows you to access several special functions normally
accessible only when switching the instrument On.
PRGM
MEM
MEM
MIN MAX
PRGM
HOLD

60
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
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

61
The 50Hz filter for rejection of low frequency fields is suppressed. The C.A 43 becomes sen-
sitive to the power supplies of electric equipment, mains cable runs,...
A first press on switches On the function and the PEAK symbol appears on the display.
- The bargraph indicates the average value of the four highest peak values measured over
100ms.
- The digital display indicates the average value of four measurements on the bargraph. This
corresponds to the average of the 16 peak values measured over 400ms.
A second press on cancels the fast acquisition and the PEAK symbol disappears.
This function allows you to measure the depth of modulation of the amplitude of an AM signal.
When the frequency modulation is less than 1kHz and of constant amplitude, the ratio Normal
measurement / Peak measurement gives the modulation percentage.
RECORDING MIN, MAX and AVG
The MIN MAX function allows you to record the minimum, maximum and average values of
the measurements. A short press (less than 2 seconds) on sets the instrument
to record mode (the RECORD and Psymbols 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
cause it to be updated. Each time the contents of the MAX register is modified, a beep
is emitted.
AVERAGE value
Initially, the average value corresponds to the value displayed when is
first pressed. Every second the instrument inputs the digital measurement, then it
takes the sum of all the values input since the beginning of the record command and
divides the whole by the number of seconds that have gone by. The result (the average
value) is transferred to the AVG register.*
Thus the contents of the AVG register are updated every second. This average value
can be assimilated to the average dose of fields measured over a given period
(dosemeter function).
The duration of AVG is shown on the clock display as HH MM.
* AVG: abbreviation of AVERAGE
PEAK
MIN MAX
MIN MAX
MIN MAX
PEAK

62
* OL: abbreviation of overload
MIN MAX
MEM
HOLD
Reading the MAX, MIN and AVG values
The display of the values contained in the MAX, MIN and AVG registers is done by
successive presses on .
The cycle of the display successively indicates the maximum value reached (MAX
symbol), the minimum value reached (MIN symbol), the average value (AVG symbol)
then the value of the current measurement and so forth.
The time of the recording is specified for the maximum and minimum values. The
duration of averaging, ∆t, is specified for the average value (AVG). If this duration is
greater than 24 hours, OL* is displayed.
Cancelling the MIN, MAX and AVG functions
The MIN, MAX and AVG recording functions are switched Off by pressing
for more than two seconds.
Notes :
- On the MIN MAX function, Auto Off is automatically cancelled ( Psymbol displayed).
- Switching On or Off SMOOTH and PEAK modes during a MIN MAX recording erases the
MIN, 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.
- Similarly, when the RECORD and PEAK symbols are displayed, the peak values are
recorded (MIN, MAX and AVG), with a measurement constant of 1ms.
- In all cases, the analogue display (BARGRAPH) constantly displays the current measu-
rement with update of the display every 20ms.
HOLD function on MIN, MAX and AVG recording mode
When is pressed with RECORD displayed :
- HOLD and PAUSE light up
- The recording is stopped and the values contained in the MIN, MAX and AVG registers are
the last values before HOLD.
- The digital display indicates the value of the last measurement, or, the MIN, MAX or AVG
value if the instrument is reading these values.
- The analogue display continues to indicates the current measurement.
MIN MAX

63
Press again to stop recording MIN, MAX and AVG values :
- The HOLD and PAUSE symbols disappear.
- The digital display indicates the current measurement or the contents of the MIN, MAX or
AVG registers on read mode.
- The instrument is again on MIN, MAX and AVG mode but the registers have not yet been
reinitialised and they contain the MIN, MAX and AVG values present before HOLD was used.
When the HOLD and RECORD-PAUSE symbols are displayed, it is also possible to cycli-
cally display the values recorded and the instantaneous measurement by short presses on
(see the sequence diagram below).
The analogue display always shows the value of the current measurement.
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MIN MAX
▼
▼
Whatever the position of the display :
- one press on stops the recording 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 will not be significant because
the instruction to record was made during the HOLD function, which blocks the reinitialisation
of these memories.
ALARM ON/OFF
When the thresholds are programmed, press to switch on detection of crossing
these thresholds.
59
HOLD
Displayed value Symbols displayed
HOLD value HOLD RECORD-PAUSE ¥(time of recording)
MAX value MAX RECORD-PAUSE ¥(time of recording)
MIN value MIN RECORD-PAUSE ¥(time of recording)
AVG value AVG RECORD-PAUSE ∆t (duration of averaging)
Currentmeasurement RECORD-PAUSE ¥(present time)
MIN MAX
HOLD
HOLD
ALARM
MIN MAX
MIN MAX

64
The or symbols, or both, light up on the display depending on the type of threshold
programmed. On the bargraph, the segments correspond to the thresholds shown in reverse
contrast.
When the alarms are On, a second press on switches Off the alarm function (the
alarm symbols disappear).
Note :
If no threshold value has been programmed, when is pressed, a sound signal
(button inoperative) will be emitted by the buzzer and this will not be taken into account.
Sound signal :
The minimum duration of operation of the buzzer on an alarm is 400ms even when this
takes place on a peak value of lesser duration.
When a threshold is crossed, a hysteresis of 1% is applied to its set point, which obliges
the measurement to fall below this lesser value to exit the alarm.
Triggering the alarm :
The digital measurement 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-
hold), the buzzer switches On and the corresponding overload symbol is displayed.
If, during programming, the value of the low threshold is higher than the value
of the high threshold , the operation of the detection is reversed giving a sound
alarm in the central zone with the buzzer On and display of both alarm symbols.
Notes:
- When the SMOOTH or PEAK function is in service, detection by the alarms is done on the
smooth or peak values.
- On the HOLD function, the comparison of the programmed thresholds continues to be done
on the current measurement.
LO
AL HI AL
ALARM
LO
AL
▼
HI
AL
▼
LO
AL
HI
AL
ALARM

65
MEMORY MODE
It is possible to enter measurements in the memory when the selector switch is on one of
the two measurement positions: V/m (A/m) or µW/cm≤.
The memory can be accessed and read when the switch is set to MR.
MANUAL MEMORY
A single press on allows you to store all the parameters of the measurement that
are present, in the measurement memory, when the command is sent :
<Time> <Filter> <Measurement> <Unit>
< Time > contains the time on the clock when the command is sent in HH MM
< Filter > may contain SMOOTH or PEAK
< Measurement > contains the digital measurement displayed
< Unit > contains the symbol for the measurement unit
Note :
The HOLD function, that may be active when the data is placed in the memory, is not held
in the memory.
When is 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
(button inoperative) is emitted and the value is not stored in memory. The maximum address,
1920, is displayed.
AUTOMATIC MEMORISATION
The C.A 43 Fieldmeter can be used for site monitoring. With a ∆t session programmed from
1 minute to 24 hours, the min, max and average values corresponding to each session are
memorised automatically.
Firstly, set the session (see ∆t programming). Then press to trigger automatic
memorisation of the MIN, MAX and AVG recordings at the selected interval (the RECORD and
MEM symbols are displayed).
MEM
MIN MAX
MEM

66
Note :
If the value of ∆t is not programmed (symbolised by three hyphens on the ∆t programming),
the memorisation does not function and the MEM symbol is not displayed.
Each memorisation is dated. This date, recorded in HH MM, also corresponds to a particular
memory address. Thus, for each wave of MIN, MAX and AVG recordings there corresponds
3 separate addresses with the time of memorisation, the unit of the measurement and the
SMOOTH or PEAK function that may have been selected.
At each memorisation the MEM symbol flashes once and a beep is sounded.
If the measurement memory is full (1920 addresses), the MEM symbol flashes and
memorisation stops.
Automatic memorisation mode is stopped by pressing for more than two
seconds. During memorisation, if the rotary switch or the measurement probe are handled,
the function is also stopped.
Notes :
The MIN, MAX and AVG values accessible 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).
Automatically, the last memorisation appears, by date.
The colon (:) at the middle of the time display is continuously visible to show that the time
displayed is not the current time. (time and date).
For each memorisation (each memory address), the different symbols remind the user of all
the parameters of the measurement at the time of the memorisation.
Press at any time to display the number of the memory address of the screen
display.
You may :
- either, read all the contents of the measurement memory by scrolling the different
memorisations by means of the and buttons;
- or, read only the memorisations that have triggered an alarm by pressing
beforehand.
MIN MAX
MIN MAX
MIN MAX
MEM
▼
▼
ALARM