4 53210A Input Signal Conditioning
116 Keysight 53210A User’s Guide
When the signal includes a DC offset, the absolute value of a relative threshold is
a function of the input coupling (AC or DC).
Figure 4-5 Input Coupling and Relative Threshold Levels.
For example, a 3 Vpp input signal with a 2 VDC offset and DC coupling would
have a Vmax: value of 3.5V and a Vmin value of 0.5V (Vmax, Vmin, and Vpp are
viewable on the front panel). With AC coupling, Vmax and Vmin would be +
1.5V
respectively.
If a 30% relative threshold is specified for the DC-coupled signal described above,
the corresponding (absolute) value is 1.4V. The same relative threshold for an
AC-coupled signal has an absolute value of -0.6V.
The absolute value of any relative threshold level can be queried using:
INPut[1]:LEVel[:ABSolute]?
or computed as:
Vmin + (% threshold x Vpp)
level w/DC coupling: 0.5 + (0.30 x 3) = 1.4V
level w/AC coupling: -1.5 + (0.30 x 3) = -0.6V
AC coupling
DC coupling
0%
100%
100%
0%
0V
(Vmax:)
(Vmin:)
(Vmax:)
(Vmin:)
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