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-4-

To Make an Insertion Loss Measurement

1. Choose the measurement parameters or recall an
instrument state.

 (or

)

2. Calibrate the analyzer.

3. Connect the
equipment.

 (or

)

4. Interpret the measurement / save results.

5. Calculate insertion loss and end of cable.

Insertion Loss Calculation

= marker value

÷

 2

= 7.36 dB

÷

 2 = 3.68 dB

End of Cable Calculation

=

λ ÷ 2

where:

λ

 (wavelength) = c

×

 V

f

÷ ∆

f

∆

f = 10 MHz between bumps

V

f

 (velocity factor)

≈ 1.0

c

≈

 10

9

 ft/sec

λ

 = 10

9

 ft/sec

÷

 10

7

 cycles/sec = 100 ft

= 100 ft

÷

 2 = 50 ft

PRESET

MEAS 1

 Reflection

 S11

AVG

 System Bandwidth  Narrow 250 Hz

CAL

 1-Port

 User 1-Port

MARKER

900

 MHz

SAVE RECALL

 Define Save  Data ON

 Prior Menu  Save State

Содержание 8712ET/ES

Страница 1: ...so please refer to your analyzer s User s Guide for safety warranty and assistance information NOTE This quick start guide assumes the use of an 8712ET or 8714ET If you are using an 8712ES or 8714ES some key presses and displays will be slightly different To Make a Fault Location Measurement 1 Choose the measurement parameters or recall an instrument state 2 Reduce the interference 3 Calibrate the...

Страница 2: ...ser s Guide Supplement for more information Problem Solution The measured amplitude and distance of a 1000 ft cable are wrong Cable is not terminated in this example Change the velocity factor and cable loss values to the values specified by the cable manufacturer MARKER Marker Search Max Search Search Mkr Max SAVE RECALL Define Save Data ON Prior Menu Save State CAL Velocity Factor Cable Loss ...

Страница 3: ...3 Connect the equipment or 4 Interpret the measurement save results 5 View SWR save results PRESET MEAS 1 Reflection S11 AVG System Bandwidth Narrow 250 Hz CAL 1 Port User 1 Port MARKER Marker Search Min Search Mkr Min SAVE RECALL Define Save Data ON Prior Menu Save State FORMAT SWR SCALE Scale Div 0 2 ENTER SAVE RECALL Save State ...

Страница 4: ...te insertion loss and end of cable Insertion Loss Calculation marker value 2 7 36 dB 2 3 68 dB End of Cable Calculation λ 2 where λ wavelength c Vf f f 10 MHz between bumps Vf velocity factor 1 0 c 109 ft sec λ 109 ft sec 107 cycles sec 100 ft 100 ft 2 50 ft PRESET MEAS 1 Reflection S11 AVG System Bandwidth Narrow 250 Hz CAL 1 Port User 1 Port MARKER 900 MHz SAVE RECALL Define Save Data ON Prior M...

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