是德科技 N2831A InfiniiMax III+ 系列探头放大器，8GHz
N2831A InfiniiMax III+ 系列探头放大器，8 GHz
特点
带宽
8 GHz（-3 dB）
Tr = 54.25 ps（10-90%）
输入范围
直流衰减比：10:1 或 5:1
输入电压范围：2.5 Vpp 或 ±1.25 V（5:1 衰减比）；5 Vpp 或 ±2.5 V（10:1 衰减比）
输入共模范围：±7 VDC（100 Hz），±1.25 V（>100 Hz）（5:1 衰减比）；±2.5 V（> 100 Hz）（10:1 衰减比）
偏置范围：±16 V（探测单端信号时）
输入阻抗
直流输入电阻：R diff = 100 kΩ ± 2%，R se = 50 kΩ ± 2%
大于 10 kHz 时的输入电阻：R diff = 1 kΩ，R se = 500 Ω
输入电容：C diff = 32 fF，C se = 44 fF（使用 ZIF 探头）
连通性
N2848A InfiniiMax III QuickTip 探头和 N5445A InfiniiMax III 点测探头
N5439A InfiniiMax III ZIF 探头
N5444A InfiniiMax III 2.92 mm/3.5 mm/SMA 探头
N5441A InfiniiMax III 焊入式探头
N2831A 系列 InfiniiMax III+ 探测系统是新一代 InfiniiMax 探测系统，在探头测量功能和易用性方面均有极大扩展，能够全面地测量差分信号。 探测系统内置 InfiniiMode 技术，用户无需更改探针连接即可切换差分、单端和共模探测模式。
N2831A 系列探头的 InfiniiMode 技术提供以下工作模式：
A – B（差分）
A – 接地（信号单端 A）
B – 接地（信号单端 B）
(A + B)/2 – 接地（共模）
InfiniiMax III+ 可与所有 InfiniiMax III 探头搭配使用，并支持 InfiniiMax III+ 的完整带宽。
N280XA InfiniiMax III | N283XA InfiniiMax III+ | MX003XA InfiniiMax 4 | |||||
450 Ω probe heads | 200 Ω probe heads | N5444A 2.92 mm | 450 Ω probe heads | N5444A 2.92 mm | 450 Ω probe heads | N5444A 2.92 mm | |
DC input resistance | Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% | Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% | 55 Ω to Vterm | Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% | 55 Ω to Vterm | Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% 55 Ω to Vterm | 55 Ω to Vterm |
Input resistance > 10 kHz | Rse=500 Ω each inputto ground, Rdiff=1 kΩ and Rcm=250 Ω | Rse=500 Ω each inputto ground, Rdiff=1 kΩ and Rcm=250 Ω | 50 Ω to .901*Vterm | Rse=500 Ω each inputto ground, Rdiff=1 kΩ and Rcm=250 Ω | 50 Ω to .901*Vterm | Rse=500 Ω each input to ground, Rdiff=1 kΩ and Rcm=250 Ω | 50 Ω to .901*Vterm |
Input voltage range (differential or single-ended), mains isolated | 1.6 Vpp, ± 0.8 V (HD2&3 < – 38 dbc),2.5 Vpp, ± 1.25 V (HD2&3 < –34 dbc) | 0.8 Vpp, ± 0.4 V (HD2&3 < – 38 dbc), 1.6 Vpp, ± 0.8 V (HD2&3 < – 34 dbc) | 1.6 Vpp, ± 0.8 V (HD2&3 < – 38 dbc),2.5 Vpp, ± 1.25 V (HD2&3 < –34 dbc) | 2.5 Vpp or ±1.25 Vat 5:1 attenuation, 5.0 Vpp or ± 2.50 V at 10:1 attenuation | 2.5 Vpp or ± 1.25 Vat 5:1 attenuation 5.0 Vpp or ± 2.50 V at 10:1 attenuation without violating max input power | 1.6 Vpp, ± 0.8 V (HD2&3 < – 38 dbc), 2.5 Vpp, ± 1.25 V (HD2&3 < –34 dbc) | 1.6 Vpp, ± 0.8 V (HD2&3 < – 38 dbc), 2.5 Vpp, ± 1.25 V (HD2&3 < –34 dbc) |
Max input power | N/A | N/A | 125 mW calculated by {[rms(vin- vterm)]^2/55]} for eachinput | N/A | 125 mW calculated by {[rms(vin- vterm)]^2/55]} for eachinput | N/A | 125 mW calculated by {[rms(vin- vterm)]^2/55]} for each input |
Input common moderange | ± 2 VDC to 250 Hz, ± 1.25 V > 250 Hz | ± 6 VDC to 250 Hz, ± 0.65 V > 250 Hz | ± 6 VDC to 250 Hz, ± 1.25 V > 250 Hz without violating max input power | ± 7 VDC to 100 Hz, ± 1.25 V > 100 Hz at 5:1 attenuation, ± 2.5 V > 100 Hz at 10:1 attenuation | ± 6 VDC to 100 Hz, ± 1.25 V > 100 Hz at 5:1 attenuation, ± 2.5 V > 100 Hz at 10:1 attenuation without violating max input power | ± 2 VDC to 250 Hz, ± 1.25 V > 250 Hz | ± 6 VDC to 250 Hz, ± 1.25 V > 250 Hz without violating max input power |
DC attenuation ratio | 6:1 | 3:1 | 6:1 | 5:1 or 10:1 Automatically selected based on volts/division (all modes) | 5:1 or 10:1 Automatically selected based on volts/division (all modes) | 6:1 | 6:1 |
Offset range (for probing a single-ended signal) | ± 16 V | ± 8 V | ± 6 V without violating max input power | ± 16 V | ± 6 V without violating max input power | ± 16 V | ± 6 V without violating max input power |
Input referred noise spectral density | 23.9 nV/rt (Hz) | 12.0 nV/rt (Hz) | 23.9 nV/rt (Hz) | Diff 5:1 atten 33.5 nV/rt (Hz) | 23.9 nV/rt (Hz) | 23.9 nV/rt (Hz) | |
Diff 10:1 atten 53.9 nV/rt (Hz) | |||||||
SE A or B 5:1 atten 27.8 nV/rt (Hz) | |||||||
SE A or B 10:1 atten 47.7 nV/rt (Hz) | |||||||
CM 5:1 atten 21.8 nV/rt (Hz) | |||||||
CM 10:1 atten 38.4 nV/rt (Hz) | |||||||
Input referred noise example | 4 mVrms with 28 GHz probe head and 30 GHz probe amp | 2 mVrms with 28 GHz probe head and 30 GHz probe amp | 4 mVrms | 4.5 mVrms in diff mode 5:1 atten with >= 18 GHz probe head and 13 GHz probe amp | 4.5 mVrms in diff mode 5:1 atten with 30 GHz N5444A probe head and 13 GH | 4 mVrms with 28 GHz probe head and 30 GHz probe amp | 4 mVrms |
Maximum input voltage | 18 Vpeak mains isolated | 18 Vpeak mains isolated | 8 Vpeak without violating max input power | 18 Vpeak mains isolated | 8 Vpeak without violating max input power | 18 Vpeak mains isolated | 8 Vpeak without violating max input power |
