特点：
·准确的回程损耗/SWR测量
·可精确的测试传输线和天线
·免受现场RF干扰
·距离错误窗口显示功能（S120A，S251A/B）
·损耗/收益存放（S114B，S332B）
·可选瓦特计
·可选内置T型连接器（S251A/B）
·合成器精确到75ppm
技术指标
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
SWR
Resolution:0.1dB
(S120A,S251A)
S810A,S818A,S820A)
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
monitor,Option 5)
Detector range:-50 to +20dBm,10nW to 100mW
Resolution:0.1dB,0.1*W
Trace memory 40(S331A and S400A)
50(S120A and S251A)
70(S800A series)
50(S120A and S251A)
70(S800A series)^*5
4(S120A and S251A)
6 (S800A series)
RF power detector:+20dBm,50Ω
Temperature
Storage:-20℃to 75℃
Weight
1.36kg(3.0lbs.)nom(S120A,S251A and S800A series)
Size
General
RS232:9-pin D-sub,three wire serial
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