EMCO 3301B Instruction 电路图.pdf

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1、 ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 Model 3301B Active Rod & Field Antenna MANUAL RadioFans.CN 收音机爱 好者资料库 MODEL 3301B ACTIVE ROD & FIELD ANTENNA ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 ETS-Lindgren L.P. reserves the right to make changes to any products herein to improve funct

2、ioning, design, or for any other reason. Nothing contained herein shall constitute ETS-Lindgren L.P. assuming any liability whatsoever arising out of the application or use of any product or circuit described herein. ETS-Lindgren L.P. does not convey any license under its patent rights or the rights

3、 of others. Copyright 2003 by ETS-Lindgren L.P. All Rights Reserved. No part of this document may be copied by any means without written permission from ETS-Lindgren L.P. E-MAIL & INTERNET Supportets- http:/www.ets- USA 1301 Arrow Point Dr., Cedar Park, TX 78613 P.O. Box 80589, Austin, TX 78708-0589

4、 Phone 512.531.6400 Fax 512.531.6500 FINLAND Euroshield OY Mekaanikontie 1 27510, Eura, Finland Phone + 358.2.838.3300 Fax + 358.2.865.1233 JAPAN 4-2-6, Kohinata Bunkyo-ku Tokyo 112-0006 JAPAN Phone + 81 3 3813 7100 Fax + 81 3 3813 8068 CHINA 1917-1918 Xue Zhixuan Building No 16 Xue Qing Road Haidia

5、n District Beijing Postcode: 100083 CHINA Phone + 86 010 82755304 Fax + 86 010 82755307 RadioFans.CN 收音机爱 好者资料库 MODEL 3301B ACTIVE ROD & FIELD ANTENNA ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 Table of Contents INTRODUCTION.1 STANDARD CONFIGURATION.2 OPTIONS.2 SPECIFICATIONS.3 OPERATIONAL SPE

6、CIFICATIONS.3 ELECTRICAL SPECIFICATIONS.5 MECHANICAL SPECIFICATIONS.6 PRINCIPLES OF OPERATION.7 DESCRIPTION.7 FRONT PANEL.7 INTERNAL OPTIONS.8 POWER CIRCUITRY.11 VOLTAGE-SELECTABLE BATTERY CHARGER.11 BATTERY LOW INDICATOR.13 FUSES.13 SETUP AND USE.14 SETUP.14 HIGH SENSITIVITY READINGS.15 THEORY OF O

7、PERATION.17 THE ROD.17 THE PRE-AMPLIFIER.19 THE ANTENNA FACTOR.21 ANTENNA IMPULSE RESPONSE.22 IMPULSE CHARACTERISTICS.22 PULSE DESENSITIZATION.24 PULSE CHARGING.25 CALIBRATION PROCEDURE.26 3301B PARTS LIST.27 ACCESSORIES AVAILABLE.27 MAINTENANCE.27 WARRANTY STATEMENT.28 EUROPEAN COMMUNITY DECLARATIO

8、N OF CONFORMITY.29 DATA AND ILLUSTRATIONS.30 RadioFans.CN 收音机爱 好者资料库 MODEL 3301B ACTIVE ROD & FIELD ANTENNA ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 MODEL 3301B ACTIVE ROD & FIELD ANTENNA Introduction ETS-LINDGREN L.P. SEPTEMBER 2003 1 REV J PN 399046 INTRODUCTION The ETS-Lindgren Model 3301

9、B is a broadband, high sensitivity Electric-Field Receiving Antenna. The unit is composed of a monopole rod antenna with a counterpoise and a broadband, high impedance pre-amplifier. The unit is designed to provide reception of an electric field in a signal band without tuning or band switching from

10、 30 Hz to 50 MHz. The 3 dB roll off points for the antenna factor are at 170 Hz and 30 MHz. Between 250 Hz and 20 MHz, the antenna factor is flat within +/- 1 dB. Despite the roll of the units antenna factor, the usable range is 30 Hz to 50 MHz. The 3301B has been designed for maximum sensitivity an

11、d dynamic range. The 3301B is capable of sensing fields of 2 dBuV/m at 1 MHz with a 1 kHz bandwidth. However, it will not saturate below a field strength of 0.7 V/m. Hence, the unit boasts an extremely wide dynamic range of 115 dB nominal at mid-band. In addition, at 10 and 30 dB (+/-10%) internal a

12、ttenuators are provided. With the attenuators the unit is usable in fields of up to 22 V/m. Thus the dynamic range of the unit is expanded to 145 dB. A saturation indicator is provided to alert the user to the need for using the internal attenuators. The Model 3301B has been designed to provide the

13、user with an extremely versatile measurement tool. Its flat antenna factor, extreme sensitivity and ultra-wide dynamic range make it a state of the art sensing instrument. Standard Configuration MODEL 3301B ACTIVE ROD & FIELD ANTENNA 2 ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 STANDARD CONFIG

14、URATION Adjustable monopole element Antenna base with built-in preamplifier and an isolated female BNC connector Counterpoise (60 cm) Base drilled to accept EMCO or other tripod mounts with standard ” x 20 threads Batteries and battery charger Individually calibrated per ECSM or IEE Std. 291. Actual

15、 individual calibration factors and signed Certificate of Calibration Conformance included in Manual. OPTIONS Remote Monitor: A 10 meter (32.8 ft) fiber optic Remote Monitor Option for remote display of power-on and saturation indicators. Tripods: ETS-Lindgren offers two nonmetallic, non-reflective

16、tripods for use at both indoor and outdoor EMC test sites. The Model 4-TR, constructed of linen phenolic and delrin, is designed with an adjustable center post for precise height adjustments. Maximum height for the 4-TR is 2.0 m (80.0 in), while minimum height is 94 cm (37.0 in). This tripod can sup

17、port up to an 11.8 kg (26.0 lb) load. The 7-TR tripod has several different configurations, including options for manual or pneumatic polarization. This tripod provides increased stability for physically large antennas. Its unique design allows for quick assembly/disassembly and convenient storage.

18、Quick height adjustment and locking wheels provide ease of use during testing. This tripod can support a 13.5 kg (30 lb) load. For the 7-TR series, maximum height is 2.17 m (85.8 in), with a minimum height of .8 m (31.8 in). The 7-TR is constructed of PVC and fiberglass components. MODEL 3301B ACTIV

19、E ROD & FIELD ANTENNA Specifications ETS-LINDGREN L.P. SEPTEMBER 2003 3 REV J PN 399046 SPECIFICATIONS OPERATIONAL SPECIFICATIONS Frequency Range: 30 Hz to 50 MHz (maximum usable bandwidth) Low Frequency Roll Off: The low frequency roll off is switch selectable to be 3dB down at 22 kHz, 1.9 kHz or 1

20、70 Hz High Frequency Roll Off: Antenna factor is 3 dB down at 30 MHz. Antenna Factor: See attached graphs. The calibration graphs where taken with the unit in the Low Gain setting. Unless otherwise noted, the low frequency roll off is set at the 170 Hz 3dB roll off point. Saturation Level: 0.7 V/m n

21、arrowband w/o attenuation and at the low gain setting. 22 V/m with 30 dB of internal attenuation selected. 63 dBuV/m/MHz broadband saturation level. Minimum Discernible Signal: See attached graphs. For best sensitivity the unit should be in the Low Gain setting with all Internal Attenuation off. Dyn

22、amic Range: 115 dB at mid-band (1 MHz). 145 dB with the use of the internal attenuators. Saturation Indicator Impulse Response: The saturation indicator will properly indicate saturation for pulsed signals which fall within the following boundaries: 1. The product of the pulse width to pulse repetit

23、ion rate must be greater than .003. 2. The pulse repetition rate must be less than value listed for the applicable duty cycle. See table 1. Specifications MODEL 3301B ACTIVE ROD & FIELD ANTENNA 4 ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 Duty Cycle Maximum PRF 10 19.7 MHz 20 14.0 MHz 30 9.2 M

24、Hz 40 5.6 MHz 50 420.0 kHz 60 130.0 kHz 70 87.0 kHz 80 57.0 kHz 90 30.0 kHz Table 1. Acceptable Pulse Repetition Rates MODEL 3301B ACTIVE ROD & FIELD ANTENNA Specifications ETS-LINDGREN L.P. SEPTEMBER 2003 5 REV J PN 399046 ELECTRICAL SPECIFICATIONS Input Impedance: The input impedance determines th

25、e low frequency roll of point. Depending on the low frequency roll off selected, the input impedance is 20 Megohms, 1 Megohm or 100 Kilohm. Output Impedance: 50 ohm (nominal) Saturation Impedance: A red LED on the front panel will be illuminated when the unit begins to saturate or clip. The saturati

26、on indicator will indicate accurately for any gain and attenuator setting. Battery Low Indicator: The power light on the front panel also serves as a Battery Low Indicator. If the green light does not come on when the power switch is engaged, then the battery requires recharging. It is recommended t

27、hat the 3301B be connected to the battery charger at all times when it is not in use. Batteries: The unit is supplied with two 6 volt sealed lead-acid batteries. The batteries will operate for approximately 10 hours between charges. Battery Charger: 115/230 VAC 50/60 Hz switch selectable, IEC input,

28、 two-stage battery charger with fast and trickle charge modes. Fuses: Type 3AG size .5 Amp, fast acting Or 5x20mm, .5 Amp, fast acting Internally mounted. Specifications MODEL 3301B ACTIVE ROD & FIELD ANTENNA 6 ETS-LINDGREN L.P. SEPTEMBER 2003 REV J PN 399046 MECHANICAL SPECIFICATIONS Size: 7.38” x

29、4.62” x 3.5” Weight: Approximately 7 lbs. Tripod Mounting: A -20 hole is provided on the base for tripod mounting. NOTE: This is not intended as a grounding point. Counterpoise Mounting: Four 6-32 holes are provided in the two metal mounting bars on the top of the unit. Antenna Element: The antenna

30、element may be set up to 41”. MODEL 3301B ACTIVE ROD & FIELD ANTENNA Principles of Operation ETS-LINDGREN L.P. SEPTEMBER 2003 7 REV J PN 399046 PRINCIPLES OF OPERATION DESCRIPTION The ETS-Lindgren 3301B Electric Field Receiving Antenna is composed of three (3) principal sections: a sensing rod, a gr

31、ound plane or counterpoise and a broadband, high input impedance pre- amplifier. The rod and counterpoise function together as an electrically short antenna over ground plane. The pre-amplifier provides impedance transformation from the extremely high impedance at the base of the rod to the 50 ohms

32、required by most receiving systems and provides power gain to allow the sensing of very low level signals. FRONT PANEL The front panel of the 3301B presents the user with: 1. Power Switch 2. Gain Switch 3. Saturation Indicator Light 4. Battery Low/Power on Indicator Light 5. BNC Output Port 6. Batte

33、ry Charging Port The Power Switch on the unit is located on the lower right side of the front panel. Activating the power switch will turn on the green Battery Low/Power On Indicator. The Battery Low/Power On Indicator is controlled by a voltage monitor circuit. Should the green indicator not turn o

34、n, or if it should turn off during use, this indicates that the battery requires charging. In the middle left of the unit is the Gain Switch. This switch increases the voltage output of the gain stage in the amplifier by 10 dB. However, best sensitivity is achieved in the Low Gain setting. Principles of Operation MODEL 3301