Основы измерений. Долгополов В.Т. - 52 стр.

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МФТИ | Москва

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Jbk.60.
RbgZ mijZ\e_gby khklhbl ba iylb ebgbc:
ATN (Attention-\gbfZgb_) bkihevam_lky ^ey mdZaZgby, l_dmsb_ ^Zggu_ y\eyxlky ^Zggufb
beb dhfZg^hc.
EOI (End or identify) Hlf_qZ_l ij_ju\Zgb_ i_j_^Zqb ^Zgguo.
IFC (Interface clear) hlf_qZ_l hqbkldm ebgbb ijb dhlhjhc \k_ bklhqgbdb b ijb_fgbdb
kb]gZeZ h[gmeyxlky.
REN (Remote enable) ebgby iha\heyxsZy ijh]jZffbjh\Zlv ih^dexq_ggu_ mkljhckl\Z
Zdlb\guf dhgljhee_jhf.
SRQ (Service request) ebgby, iha\heyxsZy ijb[hjm aZijhkblv h[kem`b\Zgb_ m Zdlb\gh]h
dhgljhee_jZ.
Ko_fZ f_oZgbq_kdh]h ih^dexq_gby ijh\h^h\ \ jZat_f_ dZ[_ey ijb\_^_gZ gZ jbk.
61.
Jbk. 61.
>\Z keh\Z h `Zj]hg_ (^_pb[_eu b dBm).
>_pb[_e y\ey_lky eh]Zjbnfbq_kdhc f_jhc hlghr_gby fhsghkl_c (Z lZd`_ lhdh\ b
gZijy`_gbc). Fhsghklv P
2
[hevr_ fhsghklb P
1
gZ a [_e, _keb
log
10
(P
2
/P
1
) = a.
Khhl\_lkl\_ggh, P
2
= 10
a
P
1
. >_pb[_e khklZ\ey_l ^_kylmx qZklv [_eZ, ihwlhfm:
a [_e =10 Z ^; = 10 log
10
(P
2
/P
1
) ^;.
QZklh, hkh[_ggh \ aZiZ^ghc ebl_jZlmj_, ^_pb[_eu bkihevamxl dZd Z[khexlgmx f_jm
fhsghklb mklZgZ\eb\Zy nbdkbjh\Zggh_ hihjgh_ agZq_gb_ fhsghklb P
1
= 1 f<l.
Khhl\_lkl\mxsb_ _^bgbpu h[hagZqZxl dZd dBm. Khhl\_lkl\_ggh, fhsghklv \ 0 dBm
jZ\gZ 1 f<l, 10 dBm hl\_qZ_l fhsghklb \ 10 f<l, 20 dBm khhl\_lkl\m_l fhsghklb \ 100
f<l. 
                                      Jbk.60.

RbgZ mijZ\e_gby khklhbl ba iylb ebgbc:
ATN (Attention-\gbfZgb_) bkihevam_lky ^ey mdZaZgby, l_dmsb_ ^Zggu_ y\eyxlky ^Zggufb
beb dhfZg^hc.
EOI (End or identify) Hlf_qZ_l ij_ju\Zgb_ i_j_^Zqb ^Zgguo.
IFC (Interface clear) hlf_qZ_l hqbkldm ebgbb ijb dhlhjhc \k_ bklhqgbdb b ijb_fgbdb
kb]gZeZ h[gmeyxlky.
REN (Remote enable) ebgby iha\heyxsZy ijh]jZffbjh\Zlv ih^dexq_ggu_ mkljhckl\Z
Zdlb\guf dhgljhee_jhf.
SRQ (Service request) ebgby, iha\heyxsZy ijb[hjm aZijhkblv h[kem`b\Zgb_ m Zdlb\gh]h
dhgljhee_jZ.
       Ko_fZ f_oZgbq_kdh]h ih^dexq_gby ijh\h^h\ \ jZat_f_ dZ[_ey ijb\_^_gZ gZ jbk.
61.




                                     Jbk. 61.
      >\Z keh\Z h `Zj]hg_ (^_pb[_eu b dBm).
>_pb[_e y\ey_lky eh]Zjbnfbq_kdhc f_jhc hlghr_gby fhsghkl_c (Z lZd`_ lhdh\ b
gZijy`_gbc). Fhsghklv P2 [hevr_ fhsghklb P1 gZ a [_e, _keb
                                     log10(P2/P1) = a.
                       a
Khhl\_lkl\_ggh, P2 = 10 P1. >_pb[_e khklZ\ey_l ^_kylmx qZklv [_eZ, ihwlhfm:
                            a [_e =10 Z ^; = 10 log10(P2/P1) ^;.
QZklh, hkh[_ggh \ aZiZ^ghc ebl_jZlmj_, ^_pb[_eu bkihevamxl dZd Z[khexlgmx f_jm
fhsghklb mklZgZ\eb\Zy nbdkbjh\Zggh_ hihjgh_ agZq_gb_ fhsghklb P1 = 1 f

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