天饋測試儀是一種精確的手持回程損耗/SWR和錯誤地址測試儀器。天饋測試儀系列提供從5MHZ-20GHZ寬頻覆蓋。具備內置錯誤地址、瓦特計、T型連接器和頻譜分析能力。重量輕，堅實，適應溫度範圍寬，是理想的野外作業工具。該設備的專利設計可免受RF干擾，這對現場測試非常重要。
特點：
·準確的回程損耗/SWR測量
·可精確的測試傳輸線和天線
·免受現場RF干擾
·距離錯誤窗口顯示功能（S120A，S251A/B）
·損耗/收益存放（S114B，S332B）
·可選瓦特計
·可選內置T型連接器（S251A/B）
·合成器精確到75ppm
技術指標
Model S331A
Frequency range 25 to 3300MHz(S331A)
25 to 4000MHz(S400A)
Freqeuncy accuracy(CW mode) 75ppm
Frequency resolution 100kHz
Immunity to interfering RF signals up to^*2 -15dBm
Return loss Range:0 to 54dB,Resolution:0.01dB
SWR Range:1 to 65,Resolution:0.01
Cable/Waveguide Loss Range:0 to 20dB,Resolution:0.01dB
Insertion Loss/Gain Display range:-120 to 100.0dB
Resolution:0.1dB
(S120A,S251A)
Distance-to-fault(S120A,S251A,S331A,
S810A,S818A,S820A) Vertical range
Return loss:0 to 54dB
SWR:1 to 65
Horizontal range:0 to 128*(resolution)
Horizontal resolution,rectangular widowing resolution(meter):
Coax:(105*10^8)(up)/△ frequency^*3
Waveguide:(1.5*10^8)(√(1-(F F1)^2/√ frequency)^*4
Wattmeter(RF power
monitor,Option 5) Display range:-80 to +80dBm,10pW to 100kW
Detector range:-50 to +20dBm,10nW to 100mW
Resolution:0.1dB,0.1*W
Bias Tee(Option 10)S251A only +15VDC,200mA maximum
Trace memory 40(S331A and S400A)
50(S120A and S251A)
70(S800A series)
Instrument configuration 9(S331A and S400A)
50(S120A and S251A)
70(S800A series)^*5
Calibration memory 2(S331A and S400A)
4(S120A and S251A)
6 (S800A series)
Test port connector Precision N female
Maximum input without damage N(f) test port:+22dBm
RF power detector:+20dBm,50Ω
Temperature Operating:0℃to 50℃
Storage:-20℃to 75℃
Weight 1.14kg(2.5lbs.)nom(S331A and S400A series)
1.36kg(3.0lbs.)nom(S120A,S251A and S800A series)
Size 203.2mm*177.8mm*57.2mm(8in*7in*2.25in)
General Electromagnetic compatibility:Meets Europerancommunity requirements for CE marking.
RS232:9-pin D-sub,three wire serial
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