Keysight 53230A - Figure 4-5 Input Coupling and Relative Threshold Levels

53220A/53230A Input Signal Conditioning 4
Keysight 53220A/53230A User’s Guide 145
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 1.4 V. The same relative threshold for an
AC-coupled signal has an absolute value of -0.6 V.
The absolute value of any relative threshold level can be queried using:
INPut[{1|2}]:LEVel[{1|2}][:ABSolute]?
or computed as:
Vmin + (% threshold x Vpp)
level w/DC coupling: 0.5 + (0.30 x 3) = 1.4 V
level w/AC coupling: -1.5 + (0.30 x 3) = -0.6 V
AC coupling
DC coupling
0%
100%
100%
0%
0V
(Vmax:)
(Vmin:)
(Vmax:)
(Vmin:)