CORNET MD18 Quick User Manual

01
t31
t2014
CORNEf
[,4D'18 Eleclrosmog meler is designed for quick measurement of hlgh
f
requency (FF)
Electromagnelic wave field strength and power level for living environment, excellent for individual or company
with
Electronragnetic wave safety
concerns.
lt has broad bandwidth (100MHz to
BGHz), high sensitivily
(-55dBm to odBm) and fast response time. The MD18 has build-in 2.4GHz lrequency
meter
lo
measure the
frequency of the delected RF signals and with internal sensing anlenna.
Applications:
- High lrequency (FF)
Electromagnetic wave field strength and signal level measurement
- Mobile phone base station antenna radialion power density measurement
- Wireless communication applications (A[,4/FN/, TDL4A. GSlVl.
DECT, CDMA, WiMax,3G,4G)
-
RF
power level measurement for transmitters,
AC smart meter radiation from ulilities company
- Wireless LAN (Wi
Fi.
2.4GHzl 5.8GHz), Bluetooth, Ultra wide-band detection, installation
- Spy camera, v/ireless bug finder
-
Cellularcordless
phone radiation safety level
-
Microwave oven leakage delection
-
Personal living environment EMF satety
(1
1)
Field slrength modes with histogram: (
see
Fig.l)
RF
signal level, frequency, MAX and the
Histogram are shown on the LCD display, use UNIT
button to select
RF
signal level unit (
dBm, mw/m2, or v/m).
(12)
Large characler Field strength mode without histogram:
( see Fig.2)
BF signal level is shown with large character, lrequency and MAX value are also shown on
lhe
LCD display, use UNIT button to select RF signal level unit (dBm,
mw/m2, or v/m).
(13)
Frequency display mode: (see
Fig.3)
Frequency
is display with large character, signal level. MAX value and frequency al the
N/AX,
Signal level are also displayed.
F=1920[4Hz
tl1
0.3564
Features:
- Broad Frequency range:
- High Dynamic range:
- High sensitivity:
- Peak power density measurement:
- Field strength measurement:
- Frequency measurement:
'l00MHz
to
SGHz
60 dB
-55dBm
to
-
odBm (25mv/m
to 14.8V/m)
0.0015mw/m'
to
580mw/m'
0.025v/m
lo
14.8v/m
100MHz lo
2.4GHz
at -35dBm and up signal level
Fio.l
Fiq.2
Fio.3
(1
4)
Frequency meter
function:
MD18
f
requency meter function can detect
ultra fast on air digital RF burst signals from GSM,
DECT, WiFi, bluetooth,
3c,4c
and wireless devices, with frequency lrom 100MHz lo 2.4GHz
It uses direct counting technology to capture the very short bursts
of the on the air on/off RF
signals down to 1O0usec. which is
not
possible
by typical scanning type of spectrum analyzers
It is excellent tor field measurement of RF signal level with instant frequency information display.
(a)
Signal level
requiremenls:
to insure the correct frequency measurement, the minimum
FF input signal level should be in between -35dBm and
OdBm.
Signal lower than -35dBm
will not have enough sensjtivity to do the correct counting, and higher than the 0dBm will
overload the pre-amplifier
of
the frequency meter.
(b)
Trigger level:
Since typical
or.r
air
RF signal is a mixture of signals from several different
sources and
is
very complicated,
Adjusting the trigger threshold level of the
rneter
will
improve the frequency counting
process,
the default value of the triggering level is
t11 (a "
t'11" mark is shown on the LCD display), use the blue UP and DOWN butron to
increase or decrease the irigger ievei unril the meier show
f=0000N,4H2
(so the signal iioor
is
just below the trigger level).
When the signal burst is detected and
is over the trigger level
the meter will start counting and show the lrequency (f=xxxxMHz). the typical trigger level
is
in between
t10
to
t12.
Depend on the trigger level setting, the stronger signal will
be
selected by the meter for the frequency measurement.
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i:r
(c)
Spread spectrum signals:
the spread spectrum RF signals (OFDM. frequency hopping...)
used
in
lhe WiFi, or DVB broadcast spread the signal over very wide frequency range,
(and with time divjsion modulations), the WiFi access poinVrouter also switchinq between
several frequency constantly {or several user channels. Because
o{
the constant changing
o{
frequency
it is difficult to do the correct frequency measurement of this type of signals.
The frequency meter function of MD18 might have enor of 100MHz to
2001\,4H2
for these
type
oi
signals, this is normal because the signal frequency
is
jurnping and not constant
al
all.
Adjusting the trigger level and move the meter near or
lar away from the signal
source can reduce the error rate.
(d)
Gating time:
ln order to detect very short digital
RF
bursts
(<1 O0usec).
the MDl
B
frequency
counter {unction has very short Gating time
(<
100usec), this Iimits the resolution ot
the low frequency signal measurement (lhe number of signal pulse is
not enough for high
resolution counting with short gating time), the MD18 frequency meter function
is intended
to show the frequency information of the detected on air RF signal from the typical mobile
phone or Wifi applications. For frequency measuremenl requires high resokttion of low
frequency signals. use the standalone professional frequency counter wilh
adjustabie Iong
Gating time and trigger level iunction is recommended.
(15)
Low battery indication:
a BAT sign will be shown on the screen when the battery level
is
below
2V.
Replace the two AA size 1.5V Alkaline baltery when the battery level is
low.
-
LCD digital power level. power density level, and
E-
field strenglh
display with auto scale
- Moving graphic Histogram, and Bar signal level display (5dBnvsegment)
- 8 high brightness color LED to display power density level wlth 3 safety range indications
-
Continues wave
(AN,4/FN,4)
and high speed digital RF (GSl\4, TDMA, PCS, CDN4A,3c, 4c,
Wi-Fi)
- Fast response time with easy reading color LED segment display (sdBm/segment)
-
Ultra iast Frequency meter display for on air digital
RF short burst on/ofj type signals
- Max. level display lunclion
and Hold mode
-
LCD back light (15 seconds aulo-off), manual LCD back light on/off control
- Low batlery indication
-
Small, compact handheld design 14cmx6.5cmx3cm
- Baltery operated (3V DC
)
two AA size 1.5V battery, not included in
the package
IfE;tltll:lmt!!
B
Put two1.5V battery in the [,4D18. push the
powetrlock-bullon
(the white button below the ON/OFF
switch) to unlock the power switch and then push the ON/OFF switch
bulton to turn
on/ofl
the
l\4D1 B.
The
RF
sensor
is
located
in
the
leJt
hand side
of
the
l\,4D18.
please do not cover the sensor area
with hand or other objects.
MODE button is
used to switch in between (a) Field strength modes with histogram, (b) Large
character Field strength mode without histogram, and (c) Frequency display mode,
HOLD button can be used to halt the data measurement of the MD18, a "
EBID
" mark will
be
shown on the LCD screen to
indicate the "HOLD" condition. Push the "HOLD" button again, the
MD18 will exit the "HOLD
' condition (exit from HOLD will clear the
MAX and
Frequency).
UNIT button is used to select the measured FF field strength on the LCD display between
dBm, mw/m2 or v/m.
BL
butlon can be used to turn
on/turn-off
the LCD backlight of the meter.
B LED
lighls. With
Red. Yellow, and Green color on the right hand side of
LCD window is used
for quick RF signal level indications. 3 Fed LEDs are used to indicate the 3 safety standard of
three countries (ltaly, Swlss. Russian). The power level
o{ each LED can be {ound in the
table below.
Histogram
of previous 30 signal level readings are recorded and shown as moving graph
on the LCD display.
MAX:
max value
of
the FF fjeld measured since the last power-on is shown on the
LCD
display; this can be used to record the maximum field strength level automatically
in the area
Pushing the HOLD button on/off wlll reset the MAX value.
LEFT, RIGHT, UP,
DOWN
(blue buttons) can be used to
move the cursor in the selection menu. or to
increase,/decrease the trigger level
of the frequency meter function.
(1)
(2)
(3)
(4)
(s)
(6)
(7)
(B)
(e)
(10)
O2014 copyrght
CCFNET
Microsystem
lnc
.
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