9100A/9200A/9400
Introduction and Operating Instructions 2-9
If specified at the time of purchase, the instrument will be supplied
with the switch set to the required voltage level however, it is
always considered good practice to check the setting before
connecting the instrument to the wall socket.
Mains Fuse
The Mains fuse protects the mains input voltage from over current
and overload conditions. Fuse rating is specified in the manual and
instructions how to replace the fuse are given in Chapter 1. Always
replace the fuse with the same type and rating as specified in the
manual.
Note that there are two types of fuses used for various mains
voltage settings. Therefore, to avoid blowing fuses, always check
that your AC voltage selector switch is set to the appropriate
voltage setting before connecting the instrument to the wall socket.
Unipolar Mode
Selector
The unipolar mode selector switch selects between two basic
operating modes, normal and unipolar. Information on these modes
is given in the following. The Model 9400 is operating in normal
mode when the switch is set to its outside position. The instrument
is operating in unipolar mode when the switch is pushed in and the
front panel Unipolar indicator illuminates.
Output Monitor
Connectors
The output monitor connectors duplicate the signal at the front
panel output connectors except the output signal is divided by 100.
These outputs are used for monitoring the output signal with low
voltage sensors.
The bandwidth of the output monitor connectors is the same as
specified for the main output connectors. There are four
connectors, designated as Channel 1 through 4, one for each
output channel.
Grounding
Considerations
Understanding how to connect your ground path could be critical to
preserving the integrity of your output signal. If you are using a
single-ended output then it will probably be safe for you to connect
the circuit ground to case ground. However, in applications
requiring floated ground connection, it is imperative that the
amplifier ground be made floating as well. Since the model 9400
has its signal ground always connected to the case ground, it is
recommended that you consult the factory for a special version of
