24
N7020A User’s Guide
2
Using the N7020A
Requirements for Optimum Probe Performance
Low Source Impedance Required
The N7020A is designed explicitly for measuring DC power supplies. In order to
maintain a flat frequency response across the probe's bandwidth, the DUT must
have extremely low source impedance, like that of a power rail. The N7020A has a
non-flat input impedance that transitions from 50 k
Ω
at DC to 50
Ω
at 1 MHz and
above. Therefore, if the DUT impedance is not low, it will divide with the probe's
impedance unequally across frequency, causing a non-flat measurement. The
recommended DUT impedance should be much less than 1 ohm. At 1 ohm, the
DC-to-AC non-flatness is about 2%.
Figure 5
shows the non-flatness for DUT
impedances of 0
Ω
, 1
Ω
, 25
Ω
, and 50
Ω
.
Figure 5
Frequency Response (Probe with N7022A Main Cable) Versus DUT Impedance
Содержание N7020A
Страница 1: ...Keysight N7020A Power Rail Probe User s Guide ...
Страница 22: ...22 N7020A User s Guide 1 General Information ...
Страница 32: ...32 N7020A User s Guide 2 Using the N7020A Figure 10 ESD Workstation ...
Страница 36: ...36 N7020A User s Guide 3 Calibrating ...
Страница 47: ...Performance Plots 5 N7020A User s Guide 47 Figure 17 Input Impedance Equivalent Model ...
Страница 48: ...48 N7020A User s Guide 5 Performance Plots ...
Страница 52: ...52 N7020A User s Guide 6 Performance Verification ...
Страница 54: ...54 N7020A User s Guide Index ...