IC693MDL760
IC693MDL760IC693MDL760
測(cè)試量程選擇
OTDR的量程是指OTDR的橫坐標(biāo)能達(dá)到的最大距離。測(cè)試時(shí)應(yīng)根據(jù)被測(cè)光纖的長(zhǎng)度選擇量程,量程是被測(cè)光纖長(zhǎng)度的1.5倍比較好。量程選擇過(guò)小時(shí),光時(shí)域反射儀的顯示屏上看不全面;量程選擇過(guò)大時(shí),光時(shí)域反射儀的顯示屏上橫坐標(biāo)壓縮看不清楚。
根據(jù)工程技術(shù)人員的實(shí)際經(jīng)驗(yàn),測(cè)試量程選擇能使背向散射曲線大約占到OTDR顯示屏的70%時(shí),不管是長(zhǎng)度測(cè)試還是損耗測(cè)試都能得到比較好的直視效果和準(zhǔn)確的測(cè)試結(jié)果。
在光纖通信系統(tǒng)測(cè)試中,鏈路長(zhǎng)度在幾百到幾千千米,中繼段長(zhǎng)度40~60 km,單盤(pán)光纜長(zhǎng)度2~4km,合選擇OTDR的量程可以得到良好的測(cè)試效果。
【公 司】: 廈門(mén)泰尼電氣有限公司
【主 營(yíng)】: AB、GE、施耐德等各類(lèi)PLC產(chǎn)品
【價(jià) 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門(mén)
【座 機(jī)】: 0592-6809819
【來(lái) 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
2.5 平均化時(shí)間選擇
由于背向散射光信號(hào)極其微弱,一般采用多次統(tǒng)計(jì)平均的方法來(lái)提高信噪比。OTDR測(cè)試曲線是將每次輸出脈沖后的反射信號(hào)采樣,并把多次采樣做平均化處理以消除隨機(jī)事件,平均化時(shí)間越長(zhǎng),噪聲電平越接近最小值,動(dòng)態(tài)范圍就越大。平均化時(shí)間為3 min獲得的動(dòng)態(tài)范圍比平均化時(shí)間為1 min獲得的動(dòng)態(tài)范圍提高0.8 dB。
一般來(lái)說(shuō)平均化時(shí)間越長(zhǎng),測(cè)試精度越高。為了提高測(cè)試速度,縮短整體測(cè)試時(shí)間,測(cè)試時(shí)間可在0.5~3 min內(nèi)選擇。
在光纖通信接續(xù)測(cè)試中,選擇1.5 min(90 s)就可獲得滿意的效果。
MARPOSS 6320610710 USPP 6320610710
MARPOSS 6320600701 NSPP 6320600701
MARPOSS 6320600600 USPP 6320600600
Marposs 6331090800 Memory Interface Card New
Marposs 6331060430 Amplifier Module Amp Card New
Marposs 6320610620 Memory Board
Marposs 6320600600 Memory Card
Marposs 6316330200 Interface Card New
MARPOSS 6830140606 51924 DECODER MODULE NEW
Marposs 6316160400 Power Supply Card New
Marposs M1 Electron LVDT Bore Gage Fixture
Marposs E-19 Gage Insrument/Amplifier
MARPOSS CONTROL BOX J7115000121 USED
Marposs 6366323703 PC Board Lightly Used
Marposs Electronic (M1 Electron) Bore Gauge
Marposs Electronic (M1 Electron) Bore Gauge
Marposs Electronic (M1 Electron) Bore Gauge
MARPOSS MODEL F3191569095 MIDA FINGER NEW
MARPOSS 6331090800 USPP 6331090800
Marposs 1634003873 Electronic (M1 Electron) Bore Gauge
Marposs U1014155221 Electronic (M1 Electron) Bore Gauge
Marposs Electronic (M1 Electron) Bore Gauge
Marposs Electric Bore Gauge M1
MARPOSS Self Centering Unit part # 3024017422
MARPOSS 6315260500 NSFP 6315260500
Marposs 6320610614 4K16 Memory EPROM W/Panel
Marposs M1 Electron LVDT Bore Gage Fixture 3708612310
MARPOSS MODEL F3190538662 FINGER NEW
MARPOSS 6830002600 BOARD MDL-106R
Marposs 6320341200 E12 8 Memory Card New
MARPOSS 3191452412 NSPP 3191452412
MARPOSS MODEL 3290861206 M1 DIAMOND FINGER CONTACT NEW
MARPOSS MODEL 3362200230 DIAMOND CONTACT NEW
MARPOSS MODEL F3190538660 FINGER NEW
MARPOSS MODEL F3190538634 FINGER NEW
MARPOSS MODEL 3394231201 CONTACT NEW
MARPOSS 6321611001 NSPP 6321611001
MARPOSS 6331340200 USPP 6331340200
Marposs Dial Bore Gage E18
MARPOSS MODEL 6331340300 TRAP CIRCUIT FOR PS UNIT NEW
NEW - Marposs A18 Part Number 3413043
CROWN MARPOSS F10 PENCIL PROBE NEW F10
Marposs E-19 Gage Insrument/Amplifier
Marposs 6331060110 Amplifier Module Amp Card New
MARPOSS 6159020200 CURRENT AMPLIFIER BOARD
MARPOSS E4 ANALOG COLUMN DISPLAY UNIT (MEASUREMENTS)
MARPOSS 6830178906 PC BOARD
MARPOSS 6517000000 DCM CONTROL MODULE
Marposs 3715000051 M1 Electron LVDT Bore Gauge
Marposs 3708612100 M1 Electron LVDT Bore Gauge 0.601/0.
0.601/0.600
F10 MARPOSS TESTAR 3441559022 RedCrown PENCIL PROBE NEW
MARPOSS E4 ANALOG COLUMN DISPLAY UNIT W/ PROBE
MARPOSS 6320610610 USPP 6320610610
MARPOSS MODEL 3394235801 CONTACT NEW
MARPOSS 6321610602 CM0S BATTERY MEM 4K8 BOARD NEW
MARPOSS MODEL 3394318001 CONTACT NEW
MARPOSS MODEL 1408612040 DIAMOND CONTACT NEW
Marposs Bore Gage Mitutoyo Metric Indicator 70mm