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ROM Elektronik HFA-3, Manual

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ROM Elektronik HFA-3 Manual Download Page 4

 

Seite 4

 

ROM-Elektronik GmbH

 

Operational startup

 

If not already carried out, insert a 9 V battery (or rechargeable battery)
into the battery compartment on the reverse side.

Screw the supplied logper antenna onto the HFA-3 where appropriate,
tighten with a tool.

 

Installation of the antenna with tuning assistance

 

Seite 49

 

ROM-Elektronik GmbH

 

Liability and guarantee

 

Every liability which arises from application of the device is excluded. The
guarantee period is 24 months from delivery date. Within this time, all de-
ficiencies, which are not attributed to inappropriate treatment, are repaired
immediately and clear of all charges. In case of repair being necessary,
please send the device to us with the proof of purchase.

 

Assistance and support

 

Should you require assistance in the application of the device, then you can
reach us under Fax No.: 08282-7305 or Tel.: 08282-7385 with operational que-
stions concerning the device.

Summary of Contents for HFA-3

Page 1: ...ROM Elektronik GmbH elektronik µ RF Analyzer HFA 3 Manual ...

Page 2: ... improve ments Only by means of this expensive development effort could we also realize many of these improvements for the HFA 3 The HFA 3 is a broadband receiver for the verification and evaluation of high frequency signals mobile telephones C Net GSM900 GSM1800 cordless telephones DECT CT1 radio and television transmitters microwave cookers The built in peak value recording allows the measuremen...

Page 3: ...170 MHz WLAN Bluetooth microwave oven 2400 MHz to 2500 MHz Display LC Display 2 lines Ambient temperature 0 to 40 C Dimensions 85mm x 117mm x 55mm Functions Adjustable volume Weight Approx 300 g Power supply 9V block battery Current consumption max 20 mA Scope of delivery HFA 3 Logper Antenna 900MHz 2600 MHz Battery Also optionally available with serial computer interface and recorder outlet Seite...

Page 4: ...ntee Every liability which arises from application of the device is excluded The guarantee period is 24 months from delivery date Within this time all de ficiencies which are not attributed to inappropriate treatment are repaired immediately and clear of all charges In case of repair being necessary please send the device to us with the proof of purchase Assistance and support Should you require a...

Page 5: ... on the PC keyboard The correct baud rate is now set adjusted and stored permanently This procedure can be repeated as often as necessary Screen for baud rate calibration OscCal 7E EEPROM 126 Kalibrier wert 63H Seite 5 ROM Elektronik GmbH Switch on the HFA 3 with the slide switch located on the side The following message should appear shortly on the display then e g With this your HFA 3 is in oper...

Page 6: ...ank in order to carry out the measurement for individual frequency ranges only The filters are set adjusted to fixed fre quencies In the measurable frequency range the 3 bands of the mobile communications are offered GSM900 GSM1800 3G UMTS cordless te lephones DECT and the services employed for computer networking such as WLAN and Bluetooth The pushbuttons located on the front side are employed to a...

Page 7: ... then push Branching off in main menu push in main menu Selection between display or menu data logger push in main menu Branch between mV m and µW m2 push in display menu Selection between mV m and µW m2 push in display menu Return to the normal operation indication push in data logger menu Set or delete dataLog and or cyclical flag push in data logger menu Return to the normal operation indicatio...

Page 8: ...mally loaded again with Recording Open and dis played as color graphics In order to save the data on a PC long term recording the HFA 3 is to be connected with a free serial interface using the cable supplied if option has been ordered If your PC does not have any serial interface the connec tion can also be realized with a USB serial converter Serial RS232 data output PC connection alternative me...

Page 9: ... Seite 9 ROM Elektronik GmbH With the left hand pushbutton LT the selection is reached In the same way you can skip back and forth between the units with the left hand pushbutton LT The arrow to the left near the unit identifies the sel ection The selection is confirmed with the right hand pushbutton RT and the display changes into the display mode Configuration of the data logger The HFA 3 is able ...

Page 10: ...ppears With activated peak hold the value reading changes wehenever the measured value is greater then stored value The bargraph shows allways the actual value follows the actual reading Modulation Radio frequency signals are difficult to measure not only because of their very different frequencies A complicating factor is that there are also many different modulation methods The latest research r...

Page 11: ...eference This adjustment functions only in case of on going measure ment and always begins with the all pass network filter independent of what was set adjusted prior to the start of the measurement The color codes as in display indication are as follows red Allpass orange GSM900 yellow GSM1800 green DECT blue 3G 3G UMTS magenta WLAN Seite 11 ROM Elektronik GmbH The HFA 3 has a fixed integrated peak...

Page 12: ... GL 3 PE Received power Aw Effective surface of the antenna S Radiation flux density 1 Only valid in free space S E H E 2 377Ω H 2 377Ω E H 377Ω PE S AW Seite 41 ROM Elektronik GmbH Recording This display is used to enable the observation and saving of the time related progress or the fluctuations of the field strength and or the power flux density during a measurement The peak values of a measurement...

Page 13: ...h external at tenuators There are attenuators available with 6 dB 10 dB and 20 dB The most frequently required attenuators are those with 10 dB and 20 dB If e g you wish to extend the measuring range from the present 10 mW m2 to 1000 mW m2 approx 20V m you require the 20 dB attenuator Factor 100 If you wish 10 000 mW m2 approx 61V m then you must additionally em ploy the 10 dB attenuator Factor 10...

Page 14: ...60 200 20 274 0 728 728 36 100 10 194 0 515 515 03 50 5 137 0 364 364 18 20 2 86 8 0 230 230 33 10 1 61 4 0 163 162 87 5 0 5 43 4 0 115 115 16 2 0 2 27 5 0 073 72 84 1 0 1 19 4 0 052 51 50 0 5 0 05 13 7 0 036 36 42 0 2 0 02 8 6 0 023 23 03 0 1 0 01 6 1 0 016 16 29 Seite 39 ROM Elektronik GmbH ring the measurement in the individual filter areas e g GSM900 either for the field strength or the power flu...

Page 15: ...able in the left upper edge which records the successful run of a measurement as a status window The transmission time is displayed near this In the text fields are displayed all measured values and their maximums du Terminal display Seite 15 ROM Elektronik GmbH A logper antenna consists of several dipoles of different lengths Every rod pair receives a different frequency The long rods are responsi...

Page 16: ...s un suitable characteristic can affect the overall linearity Only by means of large scale development efforts and with close coope ration and support through the University of the German Armed Forces Munich could a suitable radio frequency circuit finally be developed which does not indicate the disadvantages mentioned The results of these efforts are represented in the following graphics In order...

Page 17: ...lues de termined In case of the long term recording the cha racteristic plot the maximum value is additionally recorded as a function of the filter areas The filter are as are encoded in color Selection list Mode Seite 17 ROM Elektronik GmbH tenna is also included in the scope of delivery of the HFA 3 However these have the disadvantage that their outlet voltage decreases with the square of the fr...

Page 18: ...ies in the reverse at tenuation range are therefore decreased by 29 dB more than in the pass range The reverse attenuation is 29 dB The reverse attenuation applies for frequencies with sufficient separation from the respective mobile communications frequency range Table 4 shows typical reverse attenuations of the filter up to 2 5 GHz The Filter Reverse attenuation Elec field strength remaining disp...

Page 19: ...on of 29 dB This means that all frequencies outside of the pass band are decreased by at least 29 dB more strongly than GSM900 frequencies At an assumed point of measurement GSM900 and GSM1800 frequencies are present In the case of the HFA 3 we set the filter to GSM900 because e g only GSM900 interests us The influence of the E field strength measurement values of the GSM1800 frequencies will then...

Page 20: ...nt in same direction and polarization level 65 4 µW mˇ analog digital value bargraph Seite 33 ROM Elektronik GmbH Operating elements and displays The operation of the HFA3 1 0 software is possible via the menu bar com mand buttons and icons Below are presented all operating elements Menu bar command buttons and icons Statusleiste Bedienelemente Drucken Das aktuelle Anzeigefenster wird mit seinem g...

Page 21: ...alog bar has a logarithmic sub division This has two advantages 1 At low levels a clear display is visible on the bar 2 With the measured value indication of the electrical field strength in mV m a simple estimate of the radiant flux density in µW m2 is possible The analog bar additionally displays the average value and peak value si multaneously Thus a simple appraisal of the pulsed signal content ...

Page 22: ... 4 µW mˇ 65 4 µW mˇ 65 4 µW mˇ MAX mV m Seite 31 ROM Elektronik GmbH After termination of the installation you have a HFA3 1 0 icon on your desk top as well as a program group iMB HFA3 1 0 in the program strip The start using the program group is implemented by clicking as represen ted below You can also start HFA3 1 0 with a click on the window icon on the desktop Explorer offers a third possibil...

Page 23: ...tly moistened cloth for cleaning the device Never treat the housing and the display with aggressive cleaning agents A necessary battery change is signaled through Then switch off the device and take off the battery compartment cover on the reverse side and take out the used battery Insert a standard 9 volt bat tery 9 volt block as a new battery and close the battery compartment co ver The device i...

Page 24: ...ilable either as a pure software solution connection over sound card and PC or as an ac cessory unit such as e g our ADC appliance series Options DC Output Analog writer outlet The measured value is provided as electric voltage in the range from 0 volt to 2 5 volt Rmin 10 kOhm at the cinch socket Connection of the plug for headphones or signal analysis with spectrum analyzer The HFA 3 can be suppl...

Page 25: ...es a special software adaptation is necessary 3 The program works with a screen resolution of 1024 x 768 pixels Only if the employed PC also works with this screen resolution will the display fill the complete screen If the PC works with a higher resolution e g 1268 x 1024 pixels then the display occupies only a part of the PC screen The program is usable in this case If the PC works with a lower ...

Page 26: ... GmbH betic character other than d for your compact disk drive Following this you are guided by the individual steps of the installation Step 1 of the installation start Seite 27 ROM Elektronik GmbH Step 2 of the installation ...

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