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B+K precision 2165A Скачать руководство пользователя страница 12

12

CONTROLS AND INDICATORS

Fig. 6. Model 2630 Front Panel

Fig. 5. Model 2625 Front Panel

Consequently, input signals might be applied
with excessive levels outside the displayed
frequency range leading to the destruction of
the input attenuator and/or the 1st mixing stage.
Also refer to

INPUT

.

The highest attenuation (4 x 10 dB) and the highest
usable frequency range (highest scanwidth setting)
should be selected prior to connecting any signal to the
input.

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Содержание 2165A

Страница 1: ...INSTRUCTION MANUAL SPECTRUM ANALYZERS MODELS 2165A 2620A 2625 2630 ...

Страница 2: ...some power input circuits such as the on off switch fuses power transformer etc any time the equipment is connected to an ac outlet even if the equipment is turned off 6 Some equipment with a two wire ac power cord including some with polarized power plugs is the hot chassis type This includes most recent television receivers and audio equipment A plastic or wooden cabinet insulates the chassis to...

Страница 3: ...3 Instruction Manual for Models 2615A 2620A 2625 2630 SPECTRUM ANALYZERS ...

Страница 4: ...AND INDICATORS 10 CALIBRATION 15 Vertical Calibration 15 Horizontal Calibration 15 Page INTRODUCTION TO SPECTRUM ANALYSIS 17 General 17 Types of Spectrum Analyzers 17 Spectrum Analyzer Requirements 18 Frequency Measurements 18 Resolution 18 Sensitivity 19 Video Filtering 19 Spectrum Analyzer Sensitivity 19 Frequency Response 20 Tracking Generators 20 APPENDIX dBm CONVERSION 22 CUSTOMER SUPPORT 23 ...

Страница 5: ...ls 2625 and 2630 99 dBm 20 kHz BW Models 2615A and 2620A Distortion 75 dBc 2nd and 3rd harmonic 3rd order intermod 70 dBc two signals 3 MHz apart Sensitivity dB above average noise level Log scale fidelity 2 dB without attn Ref 250 MHz IF gain 10 dB adjustment range Input Input impedance 50Ω Input connector BNC Input attenuator 0 to 40 dB 4 x 10 dB steps Input attenuator accuracy 1 dB 10 dB step M...

Страница 6: ...o components or radiation sources The electric field monopole probe has the highest sensitivity of all three probes It can be used to check screening and perform pre compliance testing on a comparative basis The high impedance probe is used to measure directly on the components under test or at the conductive trace of a PC board It has an input capacitance of only 2 pF and supplies virtually no el...

Страница 7: ... 1 Safety requirements for elec trical equipment for measurement control and laboratory use The CENELEC regulations EN 61010 1 correspond to this standard It has left the factory in a safe condition This instruction manual contains important information and warn ings which have to be followed by the user to ensure safe operation and to retain the Spectrum Analyzer in a safe condition The case chas...

Страница 8: ...ment should be cleaned regularly with a dusting brush Dirt which is difficult to remove on the casing and handle the plastic and aluminum parts can be removed with a moistened cloth 99 water 1 mild detergent Spirit or washing benzene petroleum ether can be used to remove greasy dirt The screen may be cleaned with water or washing benzene but not with spirit alcohol or solvents it must then be wipe...

Страница 9: ...rred directly or via a low pass filter to another amplifier This amplifier output is connected to the Y deflection plates of the CRT The X deflection is performed with a ramp generator voltage This voltage can also be superimposed on a dc voltage which allows for the control of 1st LO The spectrum analyzer scans a frequency range depending on the ramp height This span is determined by the scanwidt...

Страница 10: ... to the IF bandwidth and or the video filter bandwidth Measurements in this case can either be taken without a video filter or the scanwidth has to be decreased 9 CENTER FREQUENCY Coarse Fine Both rotary knobs are used for center frequency setting The center frequency is displayed at the horizontal center of the screen 10 BANDWIDTH Selects the IF bandwidth When the switch is engaged the noise leve...

Страница 11: ...aticule line The lowest horizontal graticule line indicates the baseline The vertical graticule is subdivided in 10 dB steps As previously pointed out the maximum permissible input voltages may not be exceeded This is extremely important because it is possible that the spectrum analyzer will only show a partial spectrum of currently applied signals ...

Страница 12: ...lied with excessive levels outside the displayed frequency range leading to the destruction of the input attenuator and or the 1st mixing stage Also refer to INPUT The highest attenuation 4 x 10 dB and the highest usable frequency range highest scanwidth setting should be selected prior to connecting any signal to the input ...

Страница 13: ...creased by means of the button and de creased by means of the button Switching is accomplished in 1 2 5 steps from 50 kHz div to 50 MHz div The width of the scan range is displayed in MHz div and refers to each horizontal division on the graticule The center frequency is indicated by the vertical graticule line at middle of the horizontal axis If the center frequency and the scanwidth setting are ...

Страница 14: ...on of buttons may be used to achieve the desired attenuation 22 OUTPUT 50Ω BNC output of the tracking generator 23 TRACK GEN The tracking generator is activated when this button is engaged When activated a sine signal can be obtained at the OUTPUT BNC connector at a frequency determined by the spectrum analyzer In ZERO SCAN mode the center frequency appears at the output 24 LEVEL This knob adjusts...

Страница 15: ... to the spectrum analyzer input 13 The frequency of this signal should be between 2 MHz and 250 MHz Set the center frequency to the signal frequency A A single spectral line 27 dBm appears on the screen The spectral line maximum is now adjusted with the Y POS control 12 and placed at the top graticule line of the screen All input attenuators switches have to be released B Next the generator signal...

Страница 16: ...frequency to 250 MHz Adjust the peak of the 250 MHz spectral line to the horizontal screen center using the X POS control 16 D Set the generator frequency to 50 MHz If the 50 MHz spectral line is not on the 2nd graticule line from left it should be aligned using the X AMPL control 17 Then the calibration as described under C should be verified and corrected if necessary The calibrations C and D sh...

Страница 17: ...e spectrum analyzer can be used to measure long and short term stability Parameters such as noise sidebands on an oscillator residual FM of a source and frequency drift during warm up can be measured using the spectrum analyzers calibrated scans The swept frequency responses of a filter or amplifier are examples of swept frequency measurements possible with a spectrum analyzer These measurements a...

Страница 18: ...ty is usually characterized as either short term or long term Residual FM is a measure of the short term stability which is usually specified in Hz peak to peak Short term stability is also characterized by noise sidebands which are a measure of the analyzers spectral purity Noise sidebands are specified in terms of dB down and Hz away from a carrier in a specific bandwidth Long term stability is ...

Страница 19: ... power average noise power The analyzer always measures signal plus noise Therefore when the input signal is equal to the internal noise level the signal will appear 3 dB above the noise When the signal power is added to the average noise power the power level on the CRT is doubled increased by 3 dB because the signal power average noise power The maximum input level to the spectrum analyzer is th...

Страница 20: ...tor is the spectrum analyzer lst LO The spectrum analyzer tracking generator system is used in two configurations open loop and closed loop In the open loop configuration unknown external signals are connected to the spectrum analyzer input and the tracking generator output is connected to a counter This configuration is used for making selective and sensitive precise measurement of frequency by t...

Страница 21: ...21 Introduction to Spectrum Analysis Fig 7 Block Diagram ...

Страница 22: ... 15 8 μV 7 40 100 100 mV 46 1 61 1122 μV 84 37 23 14 1 μV 8 39 99 89 1 mV 47 0 60 1000 μV 85 38 22 12 6 μV 9 38 98 79 4 mV 48 1 59 891 μV 86 39 21 11 2 μV 10 37 97 70 7 mV 49 2 58 794 μV 87 40 20 10 0 μV 11 36 96 63 1 mV 50 3 57 707 μV 88 41 19 8 91 μV 12 35 95 56 2 mV 51 4 56 631 μV 89 42 18 7 94 μV 13 34 94 50 1 mV 52 5 55 562 μV 90 43 17 7 07 μV 14 33 93 44 7 mV 53 6 54 501 μV 91 44 16 6 31 μV ...

Страница 23: ...or this service We maintain a network of B K PRECISION authorized service agencies for this purpose To use this service even if the instrument is no longer under warranty follow the instructions given in the WARRANTY SERVICE INSTRUCTIONS portion of this manual There is a nominal charge for instruments out of warranty Technical advice on the use of your instrument Technical advice on special applic...

Страница 24: ...bes connectors and accessories that you are using with the device Customers not on an open account must include payment in the form of a money order or credit card For the most current repair charges please refer to the service and support section on our website Return all merchandise to B K Precision Corp with pre paid shipping The flat rate repair charge for Non Warranty Service does not include...

Страница 25: ...form on our website www bkprecision com within fifteen 15 days of purchase Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs The warranty is void if the serial number is altered defaced or removed B K Precision Corp shall not be liable for any consequential damages including without limitation damages result...

Страница 26: ...26 NOTES ...

Страница 27: ...27 ...

Страница 28: ...28 22820 Savi Ranch Parkway Yorba Linda CA 92887 v110409 Printed in China ...

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