Keysight N9038A, Service Manual, Page: 134 / 745

134 Keysight N9038A MXE Service Guide
Input Selection & Level Control
Input Selection & Level Control Section Purpose
A23 Limiter Assembly
This assembly is used to protect the rest of the instrument from large transient
signals that are often produced by Line Impedance Stabilization Networks
(LISN) which are used for making conducted emissions measurements.
Control for this assembly comes from the A21 RF Preselector Input assembly.
A23 Limiter Assembly Connections
The connections to and from the A23 Limiter assembly are as listed in Table
4-1 and as illustrated in Figure 4-1 below.
Figure 4-1 A23 Limiter Assembly Connections
Table 4-1 A23 Limiter Assembly Signals
Port Description To/From Cable
J102 IF Input RF Input J2 W26
J103 RF Output SW1 Cal Switch P1 W27
J108 JTAG Programming A21 RF Preselector Input Assembly J602 W1
P2 RF Input LED Control A1A5J1 & A1A6J1 W6