R3131:频率范围(FrequencyRange):9kHz-3.0GHz分辩带宽(ResolutionBandwidth):1kHz-1MHz电平范围:-113dBm～+30dBm间隔(Span):0Hz,50kHz～3.0GHzGPIB卡和并行打印机接口R3132:频率范围(FrequencyRange):9kHz-3.0GHz分辩带宽(ResolutionBandwidth):30kHz-3MHz电平范围:-118dBm～+30dBm间隔(Span):0Hz,50kHz～3.0GHzGPIB卡和并行打印机接口OP20:高稳定的参考频率(High-stabilityFrequencyReference)OP27:30Hz窄波段带宽（30HzNarrow-BandResolutionBandwidth）OP29:50μs高速扫描功能（50μsHigh-SpeedSweepFunction）