Keysight Technologies N6700, Руководство пользователя

Страница: 43 / 128

Installation 2
Keysight N6700 User’s Guide 43
path for any injected currents. In this case, the return path is created by
the low side of the scope probe, which is connected to the load circuit
common and also to the scope’s chassis. For this and similar cases, the
following steps by order of preference, will help mitigate common mode
current spikes appearing at the output when the power system is turned
on or off by the AC line switch:
1
Install a ferrite core (Keysight p/n 9170-2131) on the power cord to
insert additional impedance in the current path. This ferrite core is now
installed inside N6701A and N6702A mainframes.
2
Install a separate “bonding” wire from the load’s common point, to
the ground terminal of the power system. This provides a lower
impedance path that helps direct injected currents away from the
DC output leads (and the sensitive load).
3
Break the return path through the external equipment. For example,
instead of the single-ended scope shown in the figure, you can use a
differential scope with a floating input or you can connect an
isolated measuring instrument to the load.
NOTE
Disconnecting the load from the output before switching the power
system on or off will always protect the load from common mode
currents.
+S
+
-S
+
N6700 Modular
Power System
Scope
probe
1
3
2