頻譜儀檢定規(guī)程

1、頻譜分析儀檢定規(guī)程目錄:1 范圍 (22 概述 (23 計(jì)量器具控制 (23.1 首次檢定、后續(xù)檢定和使用中檢驗(yàn) (23.2 檢定條件 (23.3 檢定用設(shè)備 (24 檢定項(xiàng)目和檢定方法 (44.1 外觀及工作正常性檢查 (44.2 參考頻率的檢定 (44.3 頻率讀數(shù)準(zhǔn)確度的檢定 (54.4 游標(biāo)計(jì)數(shù)準(zhǔn)確度的檢定 (54.5 掃頻寬度的檢定 (64.6 噪聲邊帶的檢定 (74.7 系統(tǒng)相關(guān)邊帶的檢定 (84.8 剩余調(diào)頻的檢定 (94.9掃描時(shí)間的檢定 (114.10 顯示刻度保真度的檢定 (124.11 輸入衰減器開關(guān)/切換不確定度的檢定 (144.12 參考電平準(zhǔn)確度的檢定 (154.1

2、3 分辨率帶寬轉(zhuǎn)換不確定度的檢定 (164.14 絕對幅度準(zhǔn)確度(參考設(shè)置的檢定 (174.15 完整的絕對幅度準(zhǔn)確度的檢定 (194.16 分辨率帶寬準(zhǔn)確度的檢定 (204.17 頻率響應(yīng)的檢定 (214.18 其他輸入相關(guān)雜散相應(yīng)的檢定 (234.19 雜散響應(yīng)(包括三階交調(diào)失真與二次諧波失真的檢定 (264.20 增益壓縮的檢定 (304.21 平均顯示噪聲電平的檢定 (314.22 剩余響應(yīng)的檢定 (334.23 快速時(shí)域幅度準(zhǔn)確度的檢定 (344.24 跟蹤發(fā)生器絕對幅度和游標(biāo)準(zhǔn)確度的檢定(只針對選件1DN/1DQ (354.25 跟蹤發(fā)生器電平平坦度的檢定 (351 范圍本規(guī)程適用

3、于新制造、使用中和修理調(diào)整后,頻率分析范圍在30H z-26.5G Hz的頻譜分析儀的檢定。本規(guī)程以Angilent ESA系列為例,其它型號的頻譜分析儀可參照執(zhí)行。2 概述頻譜分析儀是一種帶有顯示裝置的超外差接收設(shè)備,由預(yù)選器、掃頻本振、混頻、中放、濾波、檢波、放大、顯示等部分組成。主要用于頻譜分析,也可用于測量頻率、電平、增益、衰減、調(diào)制、失真、抖動等,是通信、廣播、電視、雷達(dá)、宇航等技術(shù)領(lǐng)域中不可缺少的儀器。3 計(jì)量器具控制3.1 首次檢定、后續(xù)檢定和使用中檢驗(yàn)首次檢定是對用戶新購置的、或制造廠新生產(chǎn)的頻譜分析儀進(jìn)行的檢定。首次檢定結(jié)果應(yīng)確定各項(xiàng)計(jì)量性能是否滿足說明書中給定的相應(yīng)技術(shù)指標(biāo)

4、。后續(xù)檢定包括有效期內(nèi)的檢定、周期檢定以及修理后的檢定。后續(xù)檢定時(shí),測量儀上應(yīng)具有上次的檢定標(biāo)記和檢定證書。后續(xù)檢定后,各項(xiàng)性能指標(biāo)如變化不大,允許用戶按檢定結(jié)果使用。3.2 檢定條件3.3 檢定用設(shè)備頻率測量范圍:10MHz士100Hz分辨力:0.01Hz頻率:10MHz準(zhǔn)確度:< <1 10 -9/天頻率范圍:10MHz26.5GHz功率測量范圍及準(zhǔn)確度:(-70+30dBm,士1.2%分辨率:0.01dB頻率:50MHz,300MHz,1GHz,1.8GHz,4.4GHz頻率范圍:0.1Hz15MHz頻率準(zhǔn)確度:士0.02%波形:三角波,方波,正弦波頻率范圍:100kHz15

5、00MHz輸出電平范圍:(-35+16dBmSSB噪聲:<-120dBc/Hz(偏離載頻20kHz頻率范圍:10MHz26.5GHz頻率準(zhǔn)確度:士0.02%輸出電平范圍:(-40+16dBm頻率范圍:900MHz1800MHz電平范圍:(-300dBm相位誤差:<0.5°頻率誤差:<2.5Hz輸入阻抗:10M準(zhǔn)確度:士10mV帶寬:DC100MHz垂直刻度:0.5V5V/Div測量功能:脈沖寬度,時(shí)間間隔Delta-T測量準(zhǔn)確度:<450ps(200ns/div頻率范圍:1GHz士1MHz電平范圍:0dBm士5dB相位噪聲:<-131 dBc/Hz (頻

6、偏100 kHz<-145 dBc/Hz (頻偏1 MHz<-147 dBc/Hz (頻偏5 MHz<-149 dBc/Hz (頻偏10 MHz頻率范圍:100kHz 7GHz電平準(zhǔn)確度:<士1.8dB (100kHz3.0GHz頻率準(zhǔn)確度:<士10kHz 7GHz衰減范圍:011dB頻率范圍:50MHz士1MHz準(zhǔn)確度:士0.010dB衰減范圍:0110dB頻率范圍:50MHz士1MHz準(zhǔn)確度:士0.020dB(040dB,士0.065dB(50100dB,士0.075dB(110dB。頻率范圍:DC3GHz頻率范圍:50MHz士1MHzVSWR:1.1:150

7、MHz頻率范圍:100kHz3GHzVSWR:1.2:13G Hz頻率范圍:9kHz26.5GHz標(biāo)稱插入損耗:6dB輸出跟蹤:<0.25dB等效輸出駐波比:1.22:1頻率范圍:2GHz15GHz定向性:>16dB最大VSWR:1.35:1傳輸臂損耗標(biāo)稱值:<1.5dB耦合臂損耗標(biāo)稱值:10dB4 檢定項(xiàng)目和檢定方法4.1 外觀及工作正常性檢查晰,旋轉(zhuǎn)靈活,定位正確,無影響正常工作的機(jī)械損傷。寬、視頻帶寬、平均功能、輸人衰減、參考電平、掃描時(shí)間、游標(biāo)功能、電平顯示線等各項(xiàng)功能正常。4.2 參考頻率的檢定 圖1 參考頻率檢定*以下只針對ESA系列頻譜儀(沒有選件1D5S=fm

8、ax/2 (1*以下只針對ESA系列頻譜儀(有選件1D55分鐘預(yù)熱誤差=(f5f60/10 (215分鐘預(yù)熱誤差=(f15f60/10 (3 4.3 頻率讀數(shù)準(zhǔn)確度的檢定 圖2 頻率讀數(shù)準(zhǔn)確度CW, 1.490 GHz (Agilent E4401B and E4411BCW, 1.5 GHz (其他設(shè)置發(fā)射電平:POWER LEVEL, 10 dBmFREQUENCY, 1.490 GHz (Agilent E4401B and E4411BFREQUENCY, 1.5 GHz (其他SPAN, 20 MHz按Peak Search (or Search,記錄峰值頻率f u。Delta=f

9、uf s (4式中:f s設(shè)定的標(biāo)準(zhǔn)頻率值。4.4 游標(biāo)計(jì)數(shù)準(zhǔn)確度的檢定FREQUENCY, 1.490 GHz (Agilent E4401B and E4411BFREQUENCY, 1.5 GHz (其他SPAN, 10 MHzBW/Avg, Re s BW, 100 kHz (ManFreq Count, Marker Count (OnResolution (Man, 1 Hz按Peak Search (or Search,等待計(jì)數(shù)(可能需要幾秒鐘,記錄計(jì)數(shù)器頻率讀數(shù)fc并記錄于報(bào)告相應(yīng)表格。4.5掃頻寬度的檢定 圖3 掃頻寬度檢定掃頻器CW=頻譜儀頻率范圍×9/10,電平

10、為-5dBm信號發(fā)生器CW=頻譜儀頻率范圍/10,電平為0dBmPeak Search (or SearchMarker, DeltaPeak Search (or SearchNext Peak兩個(gè)游標(biāo)應(yīng)該在第二和第九條垂直顯示刻度線上。FREQUENCY, Start Freq, 10 MHzStop Freq, 110 MHzSweep, Sweep (Cont掃頻器CW,100MHz,POWER LEVEL,-5dBm信號發(fā)生器FREQUENCY, 20 MHz,AMPLITUDE, 0 dBmPeak Search (or SearchMarker, DeltaPeak Search

11、 (or SearchNext Peak兩個(gè)游標(biāo)應(yīng)該在第二和第九條垂直顯示刻度線上。4.6 噪聲邊帶的檢定 圖4 噪聲邊帶的檢定FREQUENCY, 1000 MHzAMPLITUDE, 0 dBm (50 Input onlyAMPLITUDE, 6 dBm (75 Input onlyAM OFFFM OFFFREQUENCY, 1 GHzSPAN, 10 MHz(寬偏頻噪聲邊帶測量為1MHzAMPLITUDE, Attenuation 10 dB (ManPeak Search (or SearchFREQUENCY, Signal Track (OnSPAN, 50 kHz(寬偏頻噪聲

12、邊帶測量為10kHzBW/Avg, 1 kHz(根據(jù)報(bào)告相應(yīng)設(shè)置為100HzVideo BW, 30 Hz (ManFREQUENCY, Signal Track (OffDet/Demod, Detector, SampleSweep, Sweep Time, 5 secSingle等待一次掃描結(jié)束后,按Peak Search (or Search鍵。Marker, DeltaMore, Function, Marker Noise (or NoiseAMPLITUDE, 10 dBm(寬偏頻噪聲邊帶測量為-40dBmFREQUENCY, CF Step, 10 kHz(根據(jù)報(bào)告相應(yīng)設(shè)置為2

13、0kHz,30kHz,98kHz(寬偏頻噪聲邊帶測量設(shè)置為99.8kHz,980kHz,5MHz,9.99MHz Center Freq,SPAN, Zero SpanSingle(寬偏頻噪聲邊帶測量設(shè)置為BW/Avg, Average On 10, Enter記錄游標(biāo)指示的噪聲電平幅度,即為10kHz的上邊帶噪聲。繼續(xù)按下列設(shè)置測試-10kHz的噪聲邊帶壓縮:FREQUENCY, Center Freq, Single記錄游標(biāo)指示的噪聲電平幅度,即為-10kHz的下邊帶噪聲。4.7 系統(tǒng)相關(guān)邊帶的檢定FREQUENCY, 500 MHzAMPLITUDE, 0 dBm (50Input on

14、lyAMPLITUDE, 6 dBm (75Input onlyAM OffFM OffFREQUENCY, 500MHzSPAN, 10 MHzPeak Search (or SearchFREQUENCY, Signal Track (OnSPAN, 200 kHzBW/Avg, 1 kHzVideo BW, 30 Hz (ManFREQUENCY, Signal Track (OffCF Step, 130 kHz (ManSinglePeak Search (or SearchMarker, DeltaFREQUENCY, SinglePeak Search (or SearchFRE

15、QUENCY, , SinglePeak Search (or Search記錄marker delta顯示的電平幅度于報(bào)告相應(yīng)表格。4.8 剩余調(diào)頻的檢定FREQUENCY, 1000 MHzAMPLITUDE, 10 dBm (50Input onlyAMPLITUDE, 4 dBm (75Input onlyAM OFFFM OFFFREQUENCY, Center Freq, 1 GHzSPAN, 1 MHzAMPLITUDE, Ref Level, 9 dBm (50Input onlyAMPLITUDE, 39.8 dBmV (75Input onlyScale/Div, 2 dB

16、BW/Avg, Re s BW, 1 kHzPeak Search (or SearchSPAN, Span Zoom, 5 kHzPeak Search (or Search, Marker, Marker Ref Lvl, Marker, OffSinglePeak Search (or SearchMeas Tools, Delta如果調(diào)節(jié)旋鈕無法達(dá)到±0.3的精度,則按如下設(shè)置再重新測量:Sweep, Sweep (ContSPAN, 2 kHzBW/Avg, Video BW, 30 Hz (ManMarker, OffPeak Search (or SearchMeas

17、ToolsDeltaMarker, NormalMarker , Mkr CFSingleBW/Avg, Video BW (Man, 1 kHzSPAN, Zero SpanSweep, Sweep Time100 ms, Single顯示的跡線應(yīng)該位于參考電平下方大概5格距離處,如果不是,按Sweep, Sweep (Cont, FREQUENCY,調(diào)整旋鈕使顯示跡線位于參考電平下方大概5格距離處,按Single,Peak Search (or Search,Pk-Pk Search,記錄marker delta (Mkr1顯示的電平幅度的絕對值,記為Deviation(dB。f(Hz=S

18、lope(Hz/dB×Deviation(dB(5 *以下為有選件1DR和1D5的頻譜儀另外需要檢定的操作FREQUENCY, Center Freq, 1 GHzSPAN, 1 MHzAMPLITUDE, Ref Level, 9 dBm (50Input onlyAMPLITUDE, 39.8 dBmV (75Input onlyScale/Div, 2 dBPeak Search (or SearchSPAN, Span Zoom, 5 kHzBW/Avg, Re s BW, 10Hz(ManSPAN, 100HzPeak Search (or Search, Marker,

19、Marker Ref Lvl, Marker, OffPeak Search (or SearchMeas Tools, DeltaMarker, NormalMarker , Mkr CFSingleBW/Avg, Video BW (Man, 10HzSPAN, Zero SpanSweep, Sweep Time20 ms, Single顯示的跡線應(yīng)該位于參考電平下方大概5格距離處,如果不是,按Sweep, Sweep (Cont, FREQUENCY,調(diào)整旋鈕使顯示跡線位于參考電平下方大概5格距離處,按Single,Peak Search (or Search,Pk-Pk Search

20、,記錄marker delta (Mkr1顯示的電平幅度的絕對值,記為Deviation(dB。f(Hz=Deviation(dB×0.426(Hz/dB(64.9掃描時(shí)間的檢定 圖5 掃描時(shí)間的檢定FREQUENCY, 500 MHzSPAN, 10 MHzSPAN, Span Zoom, 50 kHzSignal Track (OffSPAN, Zero SpanBW/Avg, Re s BW, 3 MHzSweep, Sweep Time, 5 msAMPLITUDE, Scale Type (LinPeak Search (or SearchMore, Search Para

21、meters (or Search CriteriaPeak Excursion, 3 dBSinglePeak Search (or Search, 0, s,Meas Tools, Next Pk RightMarker, DeltaPeak Search (or Search按8次Next Pk Right鍵,記錄marker delta (Mkr1顯示的時(shí)間t,按公式(7計(jì)算掃描時(shí)間準(zhǔn)確度:=100×(t-0.8×Sweep Time/Sweep Time (7式中:Sweep Time頻譜儀掃描時(shí)間,即5ms。根據(jù)報(bào)告中的掃描時(shí)間重新設(shè)置測量,記錄數(shù)據(jù)。*以下是為

22、有選件AYX,快速時(shí)域掃描,或者選件B7D,DSP和快速ADC的頻譜儀需要另外檢定的操作4.10 顯示刻度保真度的檢定 圖6 顯示刻度保真度的檢定*以下是對數(shù)刻度的檢定System, Alignments, Auto Align, OffFREQUENCY, 50 MHzSPAN, 45 kHzBW/Avg, 3 kHzBW/Avg, Video BW, 1 kHzPeak Search (or SearchBW/Avg, Average (On5, EnterPeak Search (or Search記錄marker delta ( Mkr1于對應(yīng)表格中。CLFE=ATTactua l +

23、 Mkr1-ATTref (8式中:ATTactual 步進(jìn)衰減器實(shí)際衰減量;ATTref 步進(jìn)衰減器在0dB 處的實(shí)際衰減量。ILFE= CLFE (測量衰減量-CLFE (前一衰減量 (9SPAN, 150 HzBW/Avg, 10 Hz (ESA-E Series onlyBW/Avg, 100 Hz (ESA-L Series onlyBW/Avg, Video BW, 3 HzPeak Search (or Search *以下是線性刻度的檢定System, Alignments, Auto Align, OffFREQUENCY, 50 MHzSPAN, 10 kHzBW/Avg,

24、 3 kHzAMPLITUDE, Scale Type (LinInput/Output (or Input , Input Z Corr (50 (75 Input onlyPeak Search (or Search Mkr1Ideal (mV =1000/10ATTref ATTactual -100.05(+ (10式中:ATTactual 步進(jìn)衰減器實(shí)際衰減量;ATTref 步進(jìn)衰減器在0dB 處的實(shí)際衰減量。LFE (% of REF =100×( Mkr 1-Mkr1Ideal /223.6(mV (11SPAN, 100, Hz (ESA-E Series onlyS

25、PAN, 300, Hz (ESA-L Series onlyBW/Avg, 10 Hz (ESA-E Series onlyBW/Avg, 100 Hz (ESA-L Series onlyVideo BW, 1 HzPeak Search (or Search*以下是針對有選件1DR的頻譜儀需要另外測量的0 SPAN對數(shù)保真度FREQUENCY, 50 MHzSPAN, 100 Hz (ESA-E Series onlySPAN, 500 Hz (ESA-L Series onlyBW/Avg, 10 Hz (ESA-E Series onlyBW/Avg, 100 Hz (ESA-L S

26、eries onlyPeak Search (or SearchMarker >,Marker > CFSPAN, Zero Span4.11 輸入衰減器開關(guān)/切換不確定度的檢定System, Alignments, Auto Align, OffFREQUENCY, 50 MHzSPAN, 100 kHzAMPLITUDE, 55 dBm (50 Input onlyAMPLITUDE, 6.2 dBmV (75 Input onlyAMPLITUDE, Attenuation, 10 dBAMPLITUDE, Scale/Div, 2 dBBW/Avg, 30 kHzBW/Av

27、g, Video BW, 100 HzATT Error=ATTactual(55dB-55dB-ATTactual(XdB-XdB (12 式中:ATTactual(55dB步進(jìn)衰減器設(shè)置在55dB位置處的實(shí)際衰減量;ATTactual(XdB步進(jìn)衰減器設(shè)置在XdB位置處的實(shí)際衰減量。Switching Error= Mkr1-Mkr1Ideal-ATT Error (13式中:Mkr1Ideal理想狀態(tài)下頻譜儀marker delta ( Mkr1的值。4.12 參考電平準(zhǔn)確度的檢定*以下是對數(shù)顯示刻度模式下的測量System, Alignments, Auto Align, OffFRE

28、QUENCY, 50 MHzAttenuation, 10 dB (ManScale/Div, 1 dBSPAN, 50 kHzBW/Avg, 3 kHzVideo BW, 30 HzAMPLITUDE, 25 dBm (50 Input only(E4401B,E4411BAMPLITUDE, 20 dBm(E4402B,E4403B,E4404B,E4405B,E4407BAMPLITUDE, 28.75 dBmV (75Input only (E4401B,E4411BSinglePeak Search (or SearchMarker, DeltaSPAN, 150 HzBW/Avg,

29、 10 HzVideo BW, 1 Hz*以下是線性顯示刻度模式下的測量AMPLITUDE, 25 dBm (50 Input only(E4401B,E4411BAMPLITUDE, 20 dBm(E4402B,E4403B,E4404B,E4405B,E4407BAMPLITUDE, 28.75 dBmV (75 input onlyAMPLITUDE, Scale Type (LinAMPLITUDE, More, Y Axis Units (or Amptd Units, dBm(50 input onlyAMPLITUDE, More, Y Axis Units (or Amptd

30、Units, dBmV(75 input onlySPAN, 50 kHzBW/Avg, 3 kHzVideo BW, 30 HzSweep, Sweep ContMarker, OffSinglePeak Search (or SearchMarker, DeltaSPAN, 150 HzBW/Avg, 10 HzVideo BW, 1 Hz4.13 分辨率帶寬轉(zhuǎn)換不確定度的檢定 圖7 分辨率帶寬轉(zhuǎn)換不確定度的檢定Input/Output (or Input, Amptd Ref (On (E4401B, E4411BInput/Output (or Input, Amptd Ref Out

31、 (On (E4402B,E4403B, E4404B, E4405B, E4407, E4408BFREQUENCY, Center Freq, 50 MHzSPAN, 5 kHzAMPLITUDE, More, Y Axis Units (or Amptd Units, dBmAMPLITUDE, 25 dBm (E4401B, E4411BAMPLITUDE, 19 dBm (E4402B, E4403B, E4404B, E4405B,E4407B, E4408BAMPLITUDE, Scale/Div, 1 dBBW/Avg, 1 kHzBW/Avg, Video BW, 300 H

32、zPeak Search (or SearchMarke r, Mkr CFMarker, DeltaPeak Search (or SearchMarke r, Mkr CFPeak Search (or Search記錄marker delta ( Mkr1幅度值于報(bào)告相應(yīng)表格中。FREQUENCY, Center Freq, 50 MHzSPAN, 10 kHz4.14 絕對幅度準(zhǔn)確度(參考設(shè)置的檢定 圖8 功分器/衰減器跟蹤誤差的測量 圖9 絕對幅度準(zhǔn)確度的檢定FREQUENCY, 50 MHzAMPLITUDE, 1 dBm (4dBm for 選件1DS(50 Input only

33、*針對E4401B和E4411BAMPLITUDE, 2.3 dBm (8.3dBm for 選件1DS(75 Input only *針對E4401B和E4411BAMPLITUDE, +6 dBm (4dBm for 選件1DS*針對E4402/03/04/05/07/08BRF ONAM OFFFM OFFFREQUENCY, Center Freq, 50 MHzSPAN, 2 kHzBW/ Avg, Re solution BW, 1 kHz(ManBW/Avg, Video BW, 1 kHz (ManAMPLITUDE, More, Y Axis Units, dBm (50 I

34、nput onlyAMPLITUDE, More, Y Axis Units, dBmV (75 Input onlyAMPLITUDE, Ref Level, 25 dBm(30 dBm for選件1DS(50 Input onlyAMPLITUDE, Ref Level, +28.75 dBmV(+18.75 dBmV for選件1DS(75 InputonlyAMPLITUDE, Attenuation, 10 dB(0dB for 選件1DSAMPLITUDE, More, Int Preamp (On(*只針對有選件1DS的設(shè)置AMPLITUDE, Scale Type (LogDe

35、t/Demod, Detector, SampleAMPLITUDE, More, Y Axis Units (or Amptd Units, VoltsPeak Search (or Search4.15 完整的絕對幅度準(zhǔn)確度的檢定4.15.1 如圖10連接儀器。 圖10 源的準(zhǔn)確度測量4.15.2 設(shè)置步進(jìn)衰減器衰減量為0dB,獲得兩個(gè)衰減器在50MHz&0dB位置的實(shí)際衰減總量RefAtt0dB。4.15.3 Preset信號發(fā)生器,設(shè)置輸出頻率50MHz,輸出電平12dBm4.15.4 調(diào)整信號發(fā)生器輸出電平,使得功率計(jì)讀數(shù)為0.1dBm±0.2dB,記錄此時(shí)功率計(jì)讀

36、數(shù)Amptd0dBm。4.15.5 如圖11連接儀器。 圖11 完整絕對幅度準(zhǔn)確度的檢定4.15.6 Preset頻譜儀,按System, Alignments, Align Now, All,結(jié)束后按Return, Auto Align, Off。4.15.7 繼續(xù)按照下列步驟設(shè)置頻譜儀:FREQUENCY, Center Freq, 50 MHzSPAN, 6 kHzBW/Avg, Re s BW, 1 kHzAMPLITUDE, More, Y Axis Units (or Amptd Units, dBmAMPLITUDE, Ref Level, 0 dBmAttenuation, 1

37、0 dB (Man4.15.8 按照報(bào)告中的參數(shù)設(shè)置10dB步進(jìn)衰減器,按Single,Peak Search (or Search,記錄游標(biāo)顯示幅度(Mkr1。4.15.9 如果步進(jìn)衰減器設(shè)為0dB,則按公式(16計(jì)算其幅度準(zhǔn)確度(AMPTD Accuracy。AMPTD Accuracy=Mkr1-Amptd0dBm(16如果步進(jìn)衰減器設(shè)為0dB以上時(shí),按公式(17計(jì)算器幅度準(zhǔn)確度(AMPTD Accuracy。AMPTD Accuracy= Mkr1-(Amptd0dBm-ActualTotalATT+RefAtt0dB(17式中:ActualTotalATT步進(jìn)衰減器在相應(yīng)衰減量位置時(shí)

38、的實(shí)際總衰減量。4.15.10 按AMPLITUDE, Ref Level,設(shè)置參考電平為-20dBm/-40dBm/-50dBm,并分別按照報(bào)告相應(yīng)參數(shù)設(shè)置10dB步進(jìn)衰減器,重復(fù)測量計(jì)算,并記錄數(shù)據(jù)。4.16 分辨率帶寬準(zhǔn)確度的檢定 圖12 分辨率帶寬準(zhǔn)確度的檢定FREQUENCY, 50 MHzSPAN, 7.5 MHzAMPLITUDE, Scale/Div 1 dBAMPLITUDE, Y Axis Units (or Amptd Units, dBmBW/Avg, 5 MHzBW/Avg, Video BW, 30 Hz4.17 頻率響應(yīng)的檢定*以下是頻率100kHz及以上的測量,

39、如果有選件1DS,要分別測量預(yù)放(Int Preamp開關(guān)兩種狀態(tài)下的頻率響應(yīng) 圖13 源/功分器準(zhǔn)確度的測量檢定要在功分器與頻譜儀間加一個(gè)20dB固定衰減器 圖14 100kHz以上頻率響應(yīng)的檢定FREQUENCY, Center Freq, 100 kHz (50 InputFREQUENCY, Center Freq, 1 MHz (75 InputCF Step, 100 MHzSPAN, 20 kHzInput/Output (or Input, Coupling (DC(只針對帶有選件UKB的頻譜儀AMPLITUDE, More, Int Preamp (Off (On (Opti

40、on 1DS onlyAMPLITUDE, More, Y Axis Units (or Amptd Units, dBmAMPLITUDE, Ref Level, 5 dBm 30 dBm(在Int Preamp (On狀態(tài)下Attenuation, 10 dB (Man 0 dB (Man(在Int Preamp (On狀態(tài)下Scale/Div, 1 dB 2 dB(在Int Preamp (On狀態(tài)下BW/Avg, Re s BW, 3 kHz (ManVideo BW, 3 kHz (Man*以下是頻率100kHz及以下的測量,有選件1DP的跳過此測量 圖15 100kHz以下頻率響應(yīng)

41、的檢定Function :Synchronous ac VoltsMath :dBmRE S Register :50Front/Rear Terminals :FrontRange :Auto4.18 其他輸入相關(guān)雜散相應(yīng)的檢定*以下針對E4401B和E4411B 圖16 其他輸入相關(guān)雜散相應(yīng)的檢定FREQUENCY, Center Freq, 500 MHzSPAN, 200 kHzAMPLITUDE, Attenuation, 10 dB (ManBW/Avg, Re s BW, 1 kHzPeak Search (or Search, Marke r, Mkr Ref LvlPeak

42、Search (or Search, Marker, DeltaSingleFREQUENCY, Center Freq, 100 MHzAMPLITUDE, 5 dBm(50 InputAMPLITUDE, 48.75 dBmV (75 InputMarker, NormalSweep, Sweep (ContPeak Search (or Search, Meas Tools, Mkr Ref LvlPeak Search (or Search, Meas Tools, DeltaSingle*以下針對E4402/03/04/05/07/08B 圖17 其他輸入相關(guān)雜散相應(yīng)的檢定FREQU

43、ENCY, Center Freq, 2 GHzSPAN, 200 kHzAMPLITUDE, Ref Level 10 dBmAMPLITUDE, Attenuation 0 dBm (ManBW/Avg, Re s BW, 1 kHzMarker, Select Marker (1Peak Search (or SearchMarkerDeltaMarker, Select Marker (2Peak Search (or SearchMarkerDeltaMarker, More, Marker All OffAuto CoupleSPAN, 1 MHzAMPLITUDE, Ref Le

44、vel, 10 dBmAMPLITUDE, Attenuation, 0 dBSweep, Sweep (ContMarker, More, Marker All OffAmplitude, Presel Center4.19 雜散響應(yīng)(包括三階交調(diào)失真與二次諧波失真的檢定*以下是三階交調(diào)失真的檢定 圖18 三階交調(diào)失真的檢定FREQUENCY, Center Freq, F1 MHz(F1為報(bào)告列表中指示頻率FREQUENCY, CF Step, 50 kHz (ManSPAN, 20 kHzAMPLITUDE, More, Y Axis Units (or Amptd Units, dBm

45、AMPLITUDE, Ref Level, 5 dBm (50 Input onlyAMPLITUDE, Ref Level, 10 dBm (75 Input onlyAMPLITUDE, Attenuation, 5 dB (Man (50 Input onlyAMPLITUDE, Attenuation, 0 dB (Man (75 Input onlyBW/Avg, 1 kHz (ManBW/Avg, Video BW, 300 Hz (ManPeak Search (or Search, More, Search Param, Peak Excursn, 3 dB/ Peak Sea

46、rch (or Search/ Marker,Mkr CF/ SPAN, 500 Hz/ BW/Avg, Res BW, 30 Hz,Video BW, 10 HzPeak Search (or SearchMeas ToolsMkr CF, DeltaFREQUENCY,如果RBW1kHz,則按SPAN, 4 kHz。TOI=-17dBm-Worst Distortion Amplitude/2 (21式中:-17dBm針對50Input,75Input為-36.75dBmV。*以下是E4401B和E4411B二次諧波失真的檢定 圖19 二次諧波失真的檢定FREQUENCY, 40 MHzA

47、MPLITUDE, 10 dBm (50 Input onlyAMPLITUDE, 4.3 dBm (75Input onlyFREQUENCY, Center Freq, 40 MHzSPAN, 1 MHzAMPLITUDE, 10 dBm (50 Input onlyAMPLITUDE, 44 dBmV (75Input onlyAttenuation Auto Man 10 dBBW/Avg, 30 kHzSPAN, 50 kHzBW/Avg, 1 kHzVideo BW Auto Man, 100 Hz待兩次掃描結(jié)束后再按:Peak Search (or SearchMkr, Mkr

48、CF StepMarker, DeltaFREQUENCY, Center Freq,Peak Search (or Search記錄marker delta ( Mkr1幅度值即為二次諧波壓縮(SHS。SHI=-20dBm-SHS (22式中:-20dBm針對50Input,75Input為34dBmV。*以下是E4402B和E4403B二次諧波失真的檢定 圖20 二次諧波失真的檢定0.1dB,記錄功率計(jì)在600MHz的讀數(shù),在頻譜儀上按Marker, Off。FREQUENCY, Center Freq, 300 MHzSPAN, 100 kHzAMPLITUDE, Ref Level,

49、10 dBmAMPLITUDE, Attenuation, 10 dB (ManBW/Avg, Re s BW 1 kHz (ManVideo BW, 1 kHz (ManMarkers, OffPeak Search (or Search, Marker, DeltaFREQUENCY, 600 MHzBW/Avg, Average, 10待平均結(jié)束后按Peak Search (or Search,記錄marker delta ( Mkr1作為二次諧波壓縮(SHS,按Marker, Off。/ AMPLITUDE, Ref Level, 0 dBm/ AMPLITUDE, Attenuati

50、on, 10 dB (ManPeak Search (or SearchMarker, DeltaFREQUENCY, Center Freq, 1.8 GHz(或其他頻率的兩倍功分器,按Peak Search (or Search,AMPLITUDE,Pre sel Center,再重新接入濾波器。BW/Avg, Video BW, 30 Hz (ManBW/Avg, Average, 10待平均結(jié)束后按Peak Search (or Search,記錄marker delta ( Mkr1作為二次諧波壓縮(SHS,按Marker, Off。*另:對于3.1GHz的SHI計(jì)算需要增加下列步驟

51、:FREQUENCY, 6.2 GHzSPAN, 0 HzAMPLITUDE, Ref Level, 40 dBmAMPLITUDE, Attenuation, 10 dBBW/Avg, Re s BW 1 kHzVideo BW, 30 HzSweep, Sweep time, 5 sBW/Avg, Average, 10待平均結(jié)束后按Peak Search (or Search,記錄游標(biāo)幅度讀數(shù)作為6.2GHz的噪聲電平(Noise Level。4.20 增益壓縮的檢定 圖21 增益壓縮的檢定FREQUENCY, Center Freq, 50 MHz (或列表中其他值SPAN, 150

52、kHz (或列表中其他值A(chǔ)MPLITUDE, More, Y Axis Units (or Amptd Units, dBmAMPLITUDE, Ref Level, 10 dBm, Attenuation 0 dBAMPLITUDE, Scale/Div, 10 dBBW/Avg, Re s BW, 30 kHz (或列表中其他值BW/Avg, Video BW, 300 Hz (或列表中其他值4.21 平均顯示噪聲電平的檢定 圖22 平均顯示噪聲電平的檢定Input/Output (or Input, Amptd Ref (OnFREQUENCY, Center Freq, 50 MHzS

53、PAN, 2 kHzAMPLITUDE, 25 dBm (50 Input only(只針對E4401/11BAMPLITUDE, 28.75 dBmV (75 Input only (只針對E4401/11BAMPLITUDE, 20 dBm(只針對其他型號AMPLITUDE, Attenuation, 10 dBBW/Avg, Re s BW, 1 kHzBW/Avg, Video BW, 1 kHzDet/Demod, Detector, SampleSinglePeak Search (or Search記錄幅度讀數(shù)作為參考幅度(Ref Amptd。AMPLITUDE, Attenuation, 0 dBSPAN, 20 kHzBW/Avg, Re s BW, 1 kHzSinglePeak Search (or Search記錄幅度值作為1kHz RBW的測量幅度(Meas Amptd(1kHz RBW。Rel Lvl Offset(1kHz RBW=Ref Amptd-Meas