Atec 8800 User Manual

Personal and Area Monitors

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T.O.C.

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SMARTS

TM

AREA MONITORS

2 MHz to 100 GHz Detection

•

Audible, Visible, Remote Alarms

•

Continuous, Automatic Monitoring

•

Failsafe

•

Requires No Operator

•

Indoor and Outdoor Models

•

DESCRIPTION

Narda’s SMARTS family of area monitors provides con­tinuous detection of RF radiation within a specific area.
Models are available to cover any frequency between
2 MHz and 100 GHz. These monitors represent a major
advance in safety monitoring programs for non-ionizing
radiation. In the past, a safety program was limited to per­forming periodic surveys of a particular system or area,
which meant anacute failure could go undetected until the
next survey was performed. And since all major interna­tional safety standards set limits for average exposure
level over a few minutes, the use of survey instruments
alone meant a hazardous condition could exist for days,
weeks, or even months. With the SMARTS, potentially
hazardous areas can be continuously monitored to help
insure a hazard-free environment as well as compliance
with industry and government standards.

Four models cover wide frequency bands from 2 MHz to
100 GHz. Model 8810 covers the 2 to 30 MHz HF band,
Model 8815 operates from10 to 500 MHz,and Model 8820
monitors frequencies between 500 MHz and 18 GHz. The
ultra broadband Model 8825B covers 500 MHz to 100
GHz.

Each model features a unique design for accurate detec­tion in a specific environment. At low frequencies, such as

those around HF antennas and metallic shelters, the elec­tric field component is typically greatly distorted. There­fore, the Model 8810 (2 to 30 MHz) monitors the magnetic
field which is more consistent in these environments. The
standards from Australia, Germany, the U.K. and the U.S.
all vary permissible exposure levels by 20 dB over these
frequencies. The Model 8810’s frequency curve has a
shape very similar to these standards. Its alarm threshold
is set to approximately one tenth of the exposure limits to
provide coverage over an area of several square meters.

The Model 8815 (10 to 500 MHz) utilizes what has been
termed “transitional” monitoring. At frequencies below ap­proximately 200 MHz, it responds to the magnetic field
component and it transitions to electric field detection at
frequencies above 200 MHz.

Model 8820 (500 MHz to 18 GHz) and Model 8825B
(500 MHz to 100 GHz) use broadband thermocouple
detectors to monitor the electric field. Both models
sound an alarm only when the average power level is ex­ceeded and are ideal for use with microwave systems
where pulse modulation is normally employed.

SMARTS monitors are available in a totally nonmetallic,
weatherproof enclosure for outdoor mounting. This en­closure will protect the SMARTS from dust, rain, or heavy seas.

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OPERATION

Indoor SMARTS

Personal and Area Monitors

Outdoor SMARTS

SMARTS monitors operate like common household
smoke detectors. When operating normally, the alarm
LED will flash approximately every 40 seconds. If the main
battery needs to be replaced, the flash will be accompa­nied by a “chirp.” When the SMARTS detects radiation at
its preset alarm threshold or higher, a continuous audible
and visual alarm is generated. During this alarm period an
electronic signal is provided at theSTATUS jack (J1) to ac­tivate various user-supplied remote circuitry. If the main
battery drops below critical levels, or if the detection ele­ments should fail, the system will remain in the alarm
mode until the problem is corrected. If the main battery
should fail completely there will still be a voltage at the J1
produced by a backup battery circuit.

Operation can be verified at any time by depressing the
TEST button which activates a full system test. In situa­tions where standard operating procedure produces RF
or microwave power in excess of the threshold and expo­sure to people is possible (e.g., inan anechoic chamber or
on the deck of a ship), the Model 8808 Personnel Sensor
can be used. This sensor will disable the SMARTS alarm
(via the J2 ENABLE jack) unless personnel and high
power radiation are both present.

Since standard visual and audio signals would be masked
by the weatherproof enclosure, outdoor SMARTS models
supply information to a remote location via a weather­proof, multi-pin, MIL-type connector (J101). Normal or
alarm STATUS information iscontinuously available at this
remote location. Also operated by remote control are the
ENABLE jack (J2) and the TEST function. Outdoor
SMARTS models operate from an external low voltage,
very low current supply brought in through the same con­nector. This separate DC source allows operation over a
broader temperature range.

The comprehensive SMARTS family of area monitors
should be part of every safety program involved with high
power RF or microwave energy. Other options or configu­rations, such as different alarm thresholds or calibration
frequencies, can be provided. Consultthe factory for details.

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67

Personal and Area Monitors

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SPECIFICATIONS FOR INDOOR MODELS

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MODEL No.

Frequency Range
Frequency Sensitivity

Alarm Threshold
Overload

CW

Peak
3 dB Intercept Angle
Temperature

Operating

Non-operating
Batteries

Weight (approx)
CalibrationFrequencies

Accessories Supplied

Notes:

a

Peak to peak. The threshold can be factory set to provide optimum performance over a specific band of interest.

b

The alarm threshold is proportionate to IEEE C95.1-1991 Standard and varies over the 2 to 30 MHz band. The threshold is 0.9% of
the H field Maximum Permissable Exposure (MPE) from 3 to 30 MHz and equal to 10% of the E field MPE from 2 to 30 Mhz.
(Controlled Environments)

c

The 3 dB intercept angle is >180°with the E field tangential to the mounting plane and >165°with the E field perpendicular to the
mounting plane.

d

The rated life is two years. It is recommended that this battery be replaced annually during calibration.

e

The fail-safe battery has a rated life of 5 to 10 years. It is recommended that it be checked annually during calibration and replaced
every three years.

f

Other calibration frequencies available for narrow band applications. Contact the factory.

Circuit

Fail-safe

d

e

f

8810 8815 8820 8825B

2 to 30 MHz 10 to 500 MHz 0.5 to 18 GHz 0.5 to 100 GHz

±1.5 dB

10 % of Standard

°

>180

2, 3, 10 and 30 MHz

b

60 mW/cm

60 W/cm

a

±

2.0 dB

0.1 mW/cm

2

2

>180

10, 30, 100, 300,

400 and 500 MHz

Operation Manual, J1 and J2 Mating Connectors

2

°

-10

°

C to +55°C

-40

°

Cto+75°C

9V lithium (supplied)
3V lithium (supplied)

24 oz. (0.7 kg)

3.0 dB

1.0 mW/cm

c

>180

°

8.2fGHz 8.2fGHz

2

300 mW/cm

100 W/cm

4.5 dBa0.5 - 50 GHz

6.0 dB

a

0.5 mW/cm

2

2

0.5 - 100 GHz

2

c

>180

°

ALARM OPERATION CONTROL INPUT

CONDITION

Normal Operation

Low Battery

Test Button Depressed

Alarm

Main Battery Failure

Sensor Failure

AUDIBLE &

VISUAL INDICATIONS

Light flashes every 40 sec. Low

Alarm chirps, light flashes Low

Steady sound and light High

Steady sound and light High

No sound or light High

Steady sound and light High

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J1

OUTPUT

68

1

CONDITION J2 INPUT

Normal Operation

Alarm Disabled

People Present

No People Present

Notes:

1

The STATUS signal available at J1 is a voltage source that
provides >2.4 Vdc into a 500 k
The voltage drops to <0.8 Vdc when Low. The load
impedance can be reduced to 24 k
the Main Battery Failure signal is not required.
Jack type is 3.5mm miniature phone.

2

J2 Input: Normal condition is an open circuit.
A short circuit (<100 ohms) disables the SMARTS.
Jack type is 2.5 mm miniature phone.

3

When used with the Model 8808 Personnel Sensor.

3

3

Ω

load when High.

Open Circuit

Short Circuit

Open Circuit

Short Circuit

Ω

providing that

2

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T.O.C.

SPECIFICATIONS FOR OUTDOOR MODELS

Personal and Area Monitors

N

EW

MODEL No.

Frequency Range
Frequency Sensitivity
Alarm Threshold
Overload

CW

Peak
3 dB Intercept Angle
Temperature

Operating

Non-operating

8810B-WP 8815B-WP 8820B-WP

2 to 30 MHz 10 to 500 MHz 0.5 to 18 GHz

±

1.5 dB

10% of Standard

°

>180

b

60 mW/cm

60 W/cm

2

2

±

2.0 dB

0.1 mW/cm

>180

°

C to +55°C

-20

2

°

d

-40°Cto+75°C

Power Requirements

External Supply

Enclosure Rating
Weight (approx)
Calibration Frequencies

Accessories Supplied

69 oz. (2.0 kg) 66 oz. (1.9 kg)

g

2, 3, 10 and 30 MHz

Operation Manual, J101 Mating Connector

8.5-12.5 Vdc, 5 ma (max)

NEMA 4X

f

10, 30, 100, 300,

400 and 500 MHz

Notes:

a

Includes enclosure effects. The threshold can be factory set to provide optimum performance over a specific band of interest.

b

The alarm threshold is proportionate to IEEE C95.1-1991 Standard and varies over the 2 to 30 MHz band. The threshold is 0.9% of
the H field Maximum Permissable Exposure (MPE) from 3 to 30 MHz and equal to 10% of the E field MPE from 2 to 30 MHz.

c

The 3 dB intercept angle is >180°with the E field tangential to the mounting plane and >165°with the E field perpendicular to the
mounting plane.

d

The SMARTS circuitry will operate from -20°C to +65°C. Extensive thermal analysis indicates that, under worst-case conditions
(no wind, no shade), the temperature inside the weatherproof enclosure will be a maximum of 10

°

temperature. Therefore, the maximum ambient air temperature is 55

e

The fail-safe battery has a rated life of 5 to 10 years. It is recommended that it be checked annually during calibration and replaced
every three years.

f

This is the equivalent of IEC Publication 529, Type IP66 or CSA Standard C22.2, No. 94.

g

Other calibration frequencies available for narrow band applications. Contact the factory.

C.

°

C higher than the ambient air

±

3.0 dB

1.0 mW/cm

300 mW/cm

100 W/cm

c

>180

°

8.2 GHz

a

2

2

2

ALARM OPERATION

Condition

Normal Operation

Test Circuit Opened

Alarm

Sensor Failure

Enable Circuit Closed

External Power Failure

Note:

1

The STATUS signal available at J101 provides >2.4 VDC
into a 24 k

Ω

load when High. The voltage drops to

<0.8 VDC when Low. Maximum sink current is 3 ma.

J101 Output

Low

High

High

High

Low

High

J101 WIRING DIAGRAM

1

ENABLE (GND)

STATUS (GND)

TEST

SPARE

* MUST BE CLOSED FOR PROPER OPERATION
** MUST BE OPEN FOR PROPER OPERATION

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J101

+10V
RET

ENABLE

STATUS

GND

435 MORELAND ROAD  HAUPPAUGE, NY 11788

A

(FLOATING)

K

C
H

E
B

D
F

G, H, J, L, N, P

**N.O.

TEST
*N.C.

69

Personal and Area Monitors

)

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DETERMINING LOCATION AND AREA COVERAGE

To calculate where an area monitor should be mounted,
various considerations are necessary. They include:

1. Areas where personnel are likely to be present

2. Probable radiation emanation point (or points)

3. Size of the area to be monitored

4. Safety standard level being used

5. Frequency and wavelength

Figure 2 shows the typical relationship between distance
and the reduction of the field strength in terms of equiva­lent power density in the far field. When calculating the
area a SMARTS can effectively monitor, first determine
where the unit isto be mounted and what the alarm thresh­old level is. The minimum protection area is based on the
assumption that the energy at the source of a leak will not
be known. For example, if the SMARTS was located 10
feet (“X”) from the source of the energy and it reached its
threshold of 1mW/cm

2

, a level of 10mW/cm2(the stan-

dard) would be present at adistance of 3.16 feet (√x )from

the source. Therefore, the minimum protected area would

be all points at a distance less than 6.84 (x-√x

) feet from
the SMARTS. If a failure results in a higher or lower
amount of energy at the source, then one could calculate
an even smaller “unprotected” area.

Most safety standards average exposure over a period of
six minutes. Therefore, an additional safety margin exists
since the SMARTS sounds its alarm in less than one sec­ond and corrective action could be enacted quickly by re­moving power or exiting the area).

Figures 3 and 4 represent a shelter-mounting application.
Figure 3 shows one SMARTS and its associated “safe”
zone. Figure 4 denotes the same shelter but with two
SMARTS installed. It may be advisable to use multiple
monitors depending on where the high power is gener­ated or routed.

It is always best to make actual measurements before in­stallation since calculations cannot account for the vari­ous objects that can perturb the field. Measurements are
more critical when determining the mounting position for
the Models 8810 and 8815 as they may be located in the
near field, where field strengths are very difficult to calcu­late. When monitoring a test stand where the energy
would leak from a defined area, the SMARTS should al­ways be placed as close as possible to the operator or
technician. Ideally, the SMARTS and the person should
be located the same distance from the source.

Figure 2. Equivalent Power Denisity versus Distance from Source

Figure 3. Single SMARTS Installation

Location Anywhere

2

mW/cm

1000

500

100

50

10

5.0

Equivalent Power Density (S)

1.0

0.5

12345678910

SMARTS

(at 1/10 of Std.)

X

Energy Source

on This Perimeter

X

Energy Source

Location Anywhere

on This Perimeter

Point Where Energy

is 10 Times

Level at SMARTS

A

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2

1.0 mW/cm

2

0.5 mW/cm

2

0.2 mW/cm

S at √D = 10•S at D

√10

Relative Distance (D

Point Where Energy

is 10 Times

Level at SMARTS

B

AA

*

B

Y

A=1/2Y-

A=1/2Y- 1/2Y B=1/2X- 1/2X

(at 1/10th of Std.)

B

1/4Y

*

B

A=1/2Y- 1/2Y B=1/2X- 1/2X

÷1/2Y

SMARTS

1/4Y

Y

B

*

B

Protected Area
or "Safe" Zone

÷1/2X

A

Protected Area
or "Safe" Zone

1.0

0.5

0.2

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Figure 4. Dual SMARTS Installation

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OUTLINE DRAWINGS

9.2"

23.2 cm

Microwave Oven Instruments

11.0"

28.0 cm

24.64 cm

11.8"

30.0 cm

TEST

9.7"

Models 8810, 8815

11.8"

30.0 cm

4.1"

10.3 cm

LABEL

8.2"

20.7 cm

5.3"

13.5 cm

8.2"

20.7 cm

2.3"

5.9 cm

9.2"

23.2 cm

9.7"

24.64 cm

3.0"

7.7 cm

Models 8820, 8825B

H

H

Model Height (H)

8810B-WP

8815B-WP

7.2"

18.3 cm

7.2"

18.3 cm

11.0"

28.0 cm

.281" (0.71 CM) DIA. MOUNTING HOLE
LOCATED BELOW TOP COVER, 4 PLACES

4.0"

10.2 cm

3.4 cm

CONNECTOR, 15 PIN (J101)
PER MIL-C-26482
(MATING CONN. SUPPLIED)
(NARDA P/N 30931302)

8820B-WP

1.35"

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5.2"

13.2 cm

71