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Maintenance | 11

3.0 Maintenance

3.1 Maintenance Recommendations

To ensure reliable and repeatable long-term performance, annual recalibration of

your antenna by an ETS-Lindgren experienced technician is recommended. Our

staff can recalibrate almost any type or brand of antenna. Please call to receive a

Service Order Number prior to sending an antenna for calibration.

For more information about our calibration services, visit our website at

http://www.ETS-Lindgren.com

3.2 Replacement and Optional Parts

Use the following tables to order replacement or optional parts for the

Model 3301B.

Replacement Part

Part Number

Collapsible Rod Element 41”

101263C

24” x 24” Counterpoise

100692

Rod Antenna Pre-Amplifier

100697B

Battery Charger

102615

Model 3301B Active Rod & Field

Antenna User Manual

399046

Table 1:

Replacement Parts List

Optional Part

Part Number

3301B Calibration Fixture

3301CB

Tripod, Linen Phenolic

3-TR

Remote Status Monitor

3301B-RM

25” Cable RG-223/U with BNC

Connectors

C-BNC

Replacement Batteries, 6V (2 required)

400009

Table 2:

Optional Parts List

Содержание ETS Lindgren 3301B

Страница 1: ...Model 3301B Active Rod Field Antenna User Manual...

Страница 2: ...rademarks used in this document The ETS Lindgren logo is a trademark of ETS Lindgren L P Revision Record MANUAL 3301B Part 399046 Rev K Revision Description Date A J Initial Release edits updates Thro...

Страница 3: ...15 5 1 Operational Specifications 15 5 1 1 Table of Acceptable Pulse Repetition Rates 16 5 2 Electrical Specifications 16 5 3 Mechanical Specifications 17 6 0 Principles of Operation 19 6 1 Descriptio...

Страница 4: ...eclaration of Conformity 45 Appendix C Data and Illustrations 47 Periodic Rectangular Pulse Train 47 Spectrum of Rectangular Pulse 47 Altering Pulse Width Pulse Repetition Rate 48 Active Electric Fiel...

Страница 5: ...perty damage Text that follows the symbol will provide proper procedures General Safety Considerations Safety Symbol Definition WARRANTY BEFORE SERVICING CONTACT ETS LINDGREN 1 512 531 6400 Servicing...

Страница 6: ...vi This page intentionally left blank...

Страница 7: ...1B is designed for maximum sensitivity and dynamic range and 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 As...

Страница 8: ...8 Introduction This page intentionally left blank...

Страница 9: ...satisfied with the contents and condition of your order prior to placing the product into service 2 2 Service Procedures To return a system or system component for service Step 1 Contact ETS Lindgren...

Страница 10: ...10 Receiving Your Order This page intentionally left blank...

Страница 11: ...r website at http www ETS Lindgren com 3 2 Replacement and Optional Parts Use the following tables to order replacement or optional parts for the Model 3301B Replacement Part Part Number Collapsible R...

Страница 12: ...12 Maintenance This page intentionally left blank...

Страница 13: ...e tripods for use at both indoor and outdoor EMC test sites Model 4 TR Constructed of linen phenolic and delrin designed with an adjustable center post for precise height adjustments Maximum height fo...

Страница 14: ...14 Standard Configuration This page intentionally left blank...

Страница 15: ...ation graphs were taken in the low gain setting Unless otherwise noted the low frequency roll off is set at the 170 Hz 3 dB roll off point Saturation Level 0 7 V m narrowband without attenuation and a...

Страница 16: ...57 0 kHz 90 30 0 kHz 5 2 Electrical Specifications Input Impedance The input impedance determines the low frequency roll of point Depending on the low frequency roll off selected the input impedance...

Страница 17: ...nd trickle charge modes Fuses Type 3AG size 5 Amp fast acting Or 5 x 20 mm 5 Amp fast acting Internally mounted 5 3 Mechanical Specifications Size 7 38 x 4 62 x 3 5 Weight Approximately 7 lbs Tripod M...

Страница 18: ...18 Specifications This page intentionally left blank...

Страница 19: ...t panel of the Model 3301B are the following Power switch Gain switch Saturation indicator Battery Low Power On indicator BNC Output port Battery Charging port POWER SWITCH The power switch is located...

Страница 20: ...gher impulsive signals may be measured For example with the 30 dB attenuator engaged a 93 dBuV m MHz may be measured BATTERY CHARGING PORT A Battery Charging port is provided for easy recharging of th...

Страница 21: ...Low Frequency Roll Off Moving any switch to the extreme left toward the center of the unit activates the indicated function Moving the switch to the extreme right toward the side of the unit deactivat...

Страница 22: ...tor will allow the unit to maintain calibration while measuring field strengths up to 22 V m Again the unit retains 115 dB of dynamic range Both the maximum reading before saturation and the minimum d...

Страница 23: ...use the CSA certified power cord provided If it is necessary to provide other means of attaching the battery charger to the power mains it is required that a type HD 21 PVC cord or type HD22 rubber c...

Страница 24: ...ss II double insulated Input fuse rating 200 mA time delay type 5 x 20 mm Input power connection IEC 320 power inlet Output voltage 12 VDC 13 5 15 VDC Output current 350 mA Safety approvals TUV CSA 7...

Страница 25: ...Power Circuitry 25 2 Locate the two fuses in their holders mounted on the circuit board and replace the fuses 3 Replace the bottom panel of the unit and reinstall the screws...

Страница 26: ...26 Power Circuitry This page intentionally left blank...

Страница 27: ...ude into the field being measured Open the counterpoise and attach it to the mounting strips using the screws that were just removed Next the rod should be attached to the fitting at the center of the...

Страница 28: ...strength for receivers that require it A set of minimum discernible signal graphs is included in this manual These graphs represent the smallest signal which can be detected with the Model 3301B The...

Страница 29: ...ne eighth wavelength At this point some resonance behavior is possible A rod that is electrically a half meter is one eighth wavelength at 75 MHz To keep the response of the unit linear and avoid reso...

Страница 30: ...ase with the input resulting in errant readings The Model 3301B has an internal common mode choke to minimize the impact of an inadequate test setup However proper test configuration will always be cr...

Страница 31: ...impedance of the amplifier is lowered to reduce thermal noise then the rod will be loaded down and lose sensitivity This combination of thermal noise and rod impedance sets an ultimate limit on the s...

Страница 32: ...del 3301B has been measured to begin going non linear at 64 dBuV m MHz A saturation indicator is provided on the unit This indicator will eliminate many false readings due to non linear operation The...

Страница 33: ...el 3301B combines several factors The first factor is the 6 dB required to normalize the rod to 1 meter The next is the measured capacitive loss at the front of the unit of about 4 dB Then there is th...

Страница 34: ...34 The Antenna Factor This page intentionally left blank...

Страница 35: ...e 47 By Fourier analysis we may convert this time domain representation into its frequency domain equivalent In the frequency domain the impulse becomes an infinite series of discrete spectral lines w...

Страница 36: ...Therefore extra care must be taken to protect the antenna amplifier from saturation when making impulse measurements in the frequency domain The internal attenuators in the Model 3301B allow it to ove...

Страница 37: ...user must closely monitor the antenna output for saturation 11 3 Pulse Charging The second criterion that must be met is that the PRF must fall below the rate listed in Impulse Characteristics on pag...

Страница 38: ...38 Antenna Impulse Response This page intentionally left blank...

Страница 39: ...leg Then terminate the output of the unit with 50 ohms Read the input signal strength The input signal strength measured through the calibration fixture must have 11 dB added to it The 11 dB is compo...

Страница 40: ...40 Calibration Procedure This page intentionally left blank...

Страница 41: ...er if Seller assembles the product or provides technical direction of such assembly the warranty period for such product shall commence on the date the assembly of the product is complete Notwithstand...

Страница 42: ...tems supplies and accessories BUYER S REMEDIES If Seller determines that any product fails to meet any warranty during the applicable warranty period Seller shall correct any such failure by either at...

Страница 43: ...claim arising out of or relating to the sale delivery nondelivery servicing assembling use or loss of use of the products or any part thereof or for any charges or expenses in connection therewith sh...

Страница 44: ...44 Warranty Policy for Standard EMCO Brand Products This page intentionally left blank...

Страница 45: ...ectrical equipment for measurement control and laboratory use EN60742 1989 Isolating transformers and safety isolating transformers EN55022 Class B IEC 801 2 Level 2 4 8kV IEC 801 3 Level 2 3V m IEC 8...

Страница 46: ...46 European Community Declaration of Conformity This page intentionally left blank...

Страница 47: ...ustrations 47 Appendix C Data and Illustrations PERIODIC RECTANGULAR PULSE TRAIN SPECTRUM OF RECTANGULAR PULSE Amplitudes and phases of an infinite number of harmonics are required to fully describe t...

Страница 48: ...effect of altering either the pulse width or pulse repetition rate A narrow pulse width A C spreads the pulse energy over a wider frequency band Wider pulses B D cause narrower lobes A low pulse repe...

Страница 49: ...Data and Illustrations 49 ACTIVE ELECTRIC FIELD ANTENNA CALIBRATION FIXTURE...

Страница 50: ...50 Data and Illustrations ACTIVE ROD ANTENNA CALIBRATION SETUP...

Страница 51: ...Data and Illustrations 51 TYPICAL CURVES MINIMUM DISCERNIBLE SIGNAL AT VARIOUS BANDWIDTHS...

Страница 52: ...52 Data and Illustrations TYPICAL ATTENUATION EFFECT FOR SWITCHES 1 AND 2...

Страница 53: ...Data and Illustrations 53 TYPICAL ROLL OFF CURVES FOR SWITCHES 3 AND 4...

Страница 54: ...54 Data and Illustrations TYPICAL ROLL OFF CURVES 41 ROD ANTENNA 0 DB ATTENUATION Generator output 250 mV...

Страница 55: ...Data and Illustrations 55 TYPICAL ROLL OFF CURVES 41 ROD ANTENNA 10 DB ATTENUATION Generator output 250 mV...

Страница 56: ...56 Data and Illustrations TYPICAL ROLL OFF CURVES 41 ROD ANTENNA 30 DB ATTENUATION Generator output 8000 mV...

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