Chapter 1
PORTRAYAL
What’s in This
Chapter
This chapter contains general and functional description of the
Model 9250 dual/differential wideband power amplifier. It also
describes the front and rear panel connectors and its operational
modes. It also and provides description of all features available with
the instrument.
Introduction
The Model 9250, as shown in Figure 1-1, is a bench-top, 2U, half
19” rack size, fully metal case dual channel amplifier. The
instrument can be configured to be used as two, single-ended
independent channels, or as a one input with two differential
outputs.
The inputs to the amplifiers be configured to match different source
impedances such as 50
Ω
, 75
Ω
, or 1M
Ω
and the outputs can be
configured to match different load impedances such as 50
Ω
, 75
Ω
,
or 600
Ω
.
There are three inputs for each channel:
1. Main input. This input is located on the front panel is normally
be used for signal inputs.
2. Auxiliary input. This input is located on the rear panel and can
be used as a summing input.
3. DC Offset input. This input is also located on the rear panel and
can be used for offsetting the signal level within the specified
output level window.
The outputs are located on the front panel. There are two outputs,
one for each channel. When the 9250 is configured as two
separate amplifiers, the outputs generate amplified signals within
the range of 40Vp-p into open circuit or 20Vp-p into matching load
impedance. The bandwidth of the outputs is around 20MHz for
large signals. Small signal bandwidth can reach 50MHz.
The 9250 can be configured as a differential amplifier. In this case,
the channel 2 input is disabled and channel 1 input is amplified and
distributed differentially to both outputs. In this case, channel 1
output generates in-phase signal while channel 2 outputs an