Oscilloscope and spectrum analayser ... - GSM-Forum

MrHazeem · 12-26-2002, 19:19

I want to know .... What is the difference between Oscilloscope

and spectrum analayser ...? my question is may be stupid but i'm

new to gsm repairing ...!!

Poca · 12-31-2002, 00:58

Hi

Oscilloscope ---> from 1 Hz to 100 - 500 Mhz (Mega)
Spectrum -----> from 5 kHz to 2 or more Ghz (Giga)

of course relative to with model it is

Rgs
Poca

Raheeeeb · 12-31-2002, 02:45

oohh this the only diffrence ////

MrHazeem · 12-31-2002, 05:55

Thx 4 ur reply ... But i want to start a gsm repairing center what

is the best equipement shall i use to start this job ...?

Irinel · 12-31-2002, 09:35

anybady know this imformations,i need..

zdob · 01-16-2003, 13:22

why you want to have service center?
if you don't know -What is the difference between Oscilloscope

and spectrum analayser?

bad idea!

Poca · 01-16-2003, 16:44

Hi
1 Multimeter
2 Power Supply (variable 0 - ?? V DC )
2 Oscilloscope with Prob
3 Spectrum Analyzer with prob.
or CMD 65
(Digital Radio Communication Tester) with GSM part
pretty expensive about 15 - 20 000 Dollar for used Rhode&Schwarz
4 Hot Air Soldering Station
5 Solder Iron
6 Electronics knowlage , schematics , parts
7 Luck

rgs
Poca

b0ba · 01-16-2003, 18:47

Quote:

Originally posted by Poca
Hi
1 Multimeter
2 Power Supply (variable 0 - ?? V DC )
2 Oscilloscope with Prob
3 Spectrum Analyzer with prob.
or CMD 65
(Digital Radio Communication Tester) with GSM part
pretty expensive about 15 - 20 000 Dollar for used Rhode&Schwarz
4 Hot Air Soldering Station
5 Solder Iron
6 Electronics knowlage , schematics , parts
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The first should be mentioned.

7 Luck
^^^^^^^^^
The last thing

rgs
Poca

b0ba · 01-16-2003, 18:54

@Poca
Osciloscope that can see 300Mhz is very expensive. It is cheaper to by Spectrum Analizer and 100Mhz Osc. then 300Mhz one. By the way: that kind of osciloscopes do not allow voltage over 4 volts to be present on it's input, otherwise you will burn it. Spectrum analizers are used insted of them on such frequances.

Regards

Poca · 01-17-2003, 04:11

Hi

Knowlage goes with practice so there is no point to change
location on that. Same with luck , if You have knowlage
than luck will follow it. Yes , 300 or 500 Mhz oscilloscope are expensive and should not be the first choise,but they are much more accure in measurements on high freq digital signals than spectrum analyzer.Use X10 (x20 , x50 , x100) devider on oscilloscope prob and You will increse measuremant range from 4V for ex. , that way load on measuremant point will be lower too. Newer oscilloscope have excessive voltage protection.
Of course , all depanding on model and specifications

Rgs
Poca

Germanach · 05-13-2006, 15:35

Quote:

Originally Posted by MrHazeem

I want to know .... What is the difference between Oscilloscope

and spectrum analayser ...? my question is may be stupid but i'm

new to gsm repairing ...!!

An OSCILOSCOPE will show time Vs amplitude of a signal.

the "x" axis will be the time

An SPECTRUM ANALIZER will show the spectrum of the signal; that means: The signal in the domain of frecuency.

the "x" axis will be the frecuency. How much energy of that signal is in what frecuency.

If you don't beleave me, you can find what is the spectrum of a signal f.e. in: Signals And Systems OPPENHEIM-WILLSKY-HAWAS; Pearson Ed.

LYRE · 05-13-2006, 15:55

thats rite germanach, so they do different job
br

LYRE · 05-13-2006, 15:55

sorry 4 double post...

nouri23 · 08-10-2007, 11:30

Quote:

Originally Posted by Germanach

An OSCILOSCOPE will show time Vs amplitude of a signal.

the "x" axis will be the time

An SPECTRUM ANALIZER will show the spectrum of the signal; that means: The signal in the domain of frecuency.

the "x" axis will be the frecuency. How much energy of that signal is in what frecuency.

If you don't beleave me, you can find what is the spectrum of a signal f.e. in: Signals And Systems OPPENHEIM-WILLSKY-HAWAS; Pearson Ed.

thenk's for help we need more usful information from specialist men becous in this job u must have many skill for be good gsm service repairing. for me i am chemical engineer and i must learn more

1 question in diagram of manuel (troubleshouting) how to check 13Mhz with what

1amigo · 08-20-2007, 14:27

You can find very useful information on Oscilloscope HERE !

Briefly, the Oscilloscope shows you the amplitude or the strength of a particular signal on it's screen in relation to time (normally referred to as the waveform of the signal), whereas a Spectrum Analyser will show you the response of a select circuit or a module to various frequency signals in it's required working bandwidth (required band of frequencies), so the response in term of signal strength will be displayed on the vertical or Y axis of the analyser in relation to the frequency spectrum represented by the horizontal or X axis.

12-26-2002, 19:19	#1 (permalink)
MrHazeem Freak Poster Join Date: Jul 2002 Location: MAD Age: 50 Posts: 483 Member: 13545 Status: Offline Thanks Meter: 2	Oscilloscope and spectrum analayser ... I want to know .... What is the difference between Oscilloscope and spectrum analayser ...? my question is may be stupid but i'm new to gsm repairing ...!!

01-16-2003, 13:22	#6 (permalink)
zdob No Life Poster Join Date: Dec 2000 Age: 44 Posts: 1,541 Member: 2911 Status: Offline Thanks Meter: 3	@ MrHazeem why you want to have service center? if you don't know -What is the difference between Oscilloscope and spectrum analayser? bad idea!

08-20-2007, 14:27	#15 (permalink)
1amigo No Life Poster Join Date: Mar 2003 Location: India Age: 73 Posts: 546 Member: 23587 Status: Offline Thanks Meter: 63	Some Useful Info here on Oscilloscopes and Spectrum Analysers You can find very useful information on Oscilloscope HERE ! Briefly, the Oscilloscope shows you the amplitude or the strength of a particular signal on it's screen in relation to time (normally referred to as the waveform of the signal), whereas a Spectrum Analyser will show you the response of a select circuit or a module to various frequency signals in it's required working bandwidth (required band of frequencies), so the response in term of signal strength will be displayed on the vertical or Y axis of the analyser in relation to the frequency spectrum represented by the horizontal or X axis.

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12-31-2002, 00:58	#2 (permalink)
Poca Freak Poster Join Date: May 2002 Location: Sweden Posts: 277 Member: 12318 Status: Offline Thanks Meter: 5	Hi Oscilloscope ---> from 1 Hz to 100 - 500 Mhz (Mega) Spectrum -----> from 5 kHz to 2 or more Ghz (Giga) of course relative to with model it is Rgs Poca

12-31-2002, 02:45	#3 (permalink)
Raheeeeb No Life Poster Join Date: Oct 2001 Location: -------- Age: 55 Posts: 1,009 Member: 7062 Status: Offline Thanks Meter: 126	oohh this the only diffrence ////

12-31-2002, 05:55	#4 (permalink)
MrHazeem Freak Poster Join Date: Jul 2002 Location: MAD Age: 50 Posts: 483 Member: 13545 Status: Offline Thanks Meter: 2	Thx 4 ur reply ... But i want to start a gsm repairing center what is the best equipement shall i use to start this job ...?

12-31-2002, 09:35	#5 (permalink)
Irinel No Life Poster Join Date: Oct 1999 Age: 48 Posts: 1,867 Member: 4201 Status: Offline Thanks Meter: 6	anybady know this imformations,i need..

01-16-2003, 16:44	#7 (permalink)
Poca Freak Poster Join Date: May 2002 Location: Sweden Posts: 277 Member: 12318 Status: Offline Thanks Meter: 5	Hi 1 Multimeter 2 Power Supply (variable 0 - ?? V DC ) 2 Oscilloscope with Prob 3 Spectrum Analyzer with prob. or CMD 65 (Digital Radio Communication Tester) with GSM part pretty expensive about 15 - 20 000 Dollar for used Rhode&Schwarz 4 Hot Air Soldering Station 5 Solder Iron 6 Electronics knowlage , schematics , parts 7 Luck rgs Poca

01-16-2003, 18:54	#9 (permalink)
b0ba No Life Poster Join Date: Oct 2001 Location: No route to host. Age: 44 Posts: 895 Member: 6772 Status: Offline Thanks Meter: 17	@Poca Osciloscope that can see 300Mhz is very expensive. It is cheaper to by Spectrum Analizer and 100Mhz Osc. then 300Mhz one. By the way: that kind of osciloscopes do not allow voltage over 4 volts to be present on it's input, otherwise you will burn it. Spectrum analizers are used insted of them on such frequances. Regards

01-17-2003, 04:11	#10 (permalink)
Poca Freak Poster Join Date: May 2002 Location: Sweden Posts: 277 Member: 12318 Status: Offline Thanks Meter: 5	Hi Knowlage goes with practice so there is no point to change location on that. Same with luck , if You have knowlage than luck will follow it. Yes , 300 or 500 Mhz oscilloscope are expensive and should not be the first choise,but they are much more accure in measurements on high freq digital signals than spectrum analyzer.Use X10 (x20 , x50 , x100) devider on oscilloscope prob and You will increse measuremant range from 4V for ex. , that way load on measuremant point will be lower too. Newer oscilloscope have excessive voltage protection. Of course , all depanding on model and specifications Rgs Poca

05-13-2006, 15:55	#12 (permalink)
LYRE Freak Poster Join Date: Apr 2002 Location: Zgr Age: 48 Posts: 221 Member: 11112 Status: Offline Thanks Meter: 11	thats rite germanach, so they do different job br

05-13-2006, 15:55	#13 (permalink)
LYRE Freak Poster Join Date: Apr 2002 Location: Zgr Age: 48 Posts: 221 Member: 11112 Status: Offline Thanks Meter: 11	sorry 4 double post...