about dbm/200khz problem..

super

Dear all :
               The doc spec write as below ,
                   Frequency         Emission Level
8 |0 _+ D4 f, g( t& Q: u                2Mhz to 50Mhz    -30dbm/200khz
* M! `" L( G3 ]0 ~4 }! Y; n. }4 V; o
$ Y' M6 V" F: x7 r% C2 B             1. what's it mean ?
             2. How should I do when I measure spurious use Spectrum Analyzer ?
* j) y2 Z% Z5 k7 Z' Y            (ex: set RBW=200khz  and measured spurious below -30dbm is pass ?
. m" c4 _# l" a9 Y! j+ w1 z% F9 l                   or others )


/ o- w7 C8 \1 m& h5 H& _. c              Thanks.

cqmyg5

I'm not an expert, I think "set RBW=200khz  and measured spurious below -30dbm is pass" is correct.
I know another spec: -40dBm/1MHz, that's to measure dBm per 100k(RBW=100k)., then sum(10), if below -40dBm is pass.

super

Dear sir :
           Thanks your reply.
            To confirm again ,
# {, a. K8 R8 }# {8 Y          1. It means when I measure use Spectrum Analyser I need to set
              RBW=200Khz start=2Mhz stop=50Mhz,
* E- c$ r! L5 Q# X  ?+ n             if measured power level >-30dBm then it's fail , <-30dBm it's pass.
              Right ?

          2. But my boss tell me it's need below -70dbm not -30dbm , I don't know why.
4 `. v. t8 l/ v2 y! d             If I transfer it to dbm/hz is -83dmb/hz ,it become more severe than -70dbm
             and unit also different.
2 Y  n& K2 ]- p' k5 w: @             I don't know which part is wrong ?

           Thanks.