User Manual 9250
Portrayal 1-5
Note
Channel 1 Input only is used when the Model 9250
is configured to operate in differential mode.
Channel 2 Input
This input connector accepts signals within the range of DC to over
20 MHz and amplifies them by a fixed gain. The gain is normally
x10 however, this number may be different if you ordered the
amplifier with different gain setting. Input impedance is factory pre-
conditioned and has one of the following values: 50
Ω
, or 1M
Ω
.
1M
Ω
input impedance can be used for low frequency signals (up to
100kHz) however, higher frequencies require 50
Ω
termination at
the input of the amplifier to eliminate standing waves and
reflections in the input cable, which can cause excessive ringing
and aberrations at the output.
The amplifier input can not tolerate high voltage on its 50
Ω
resistance. Therefore, before applying the cable to the input
connector, make sure your signal will not exceed input rating, as
specified in Appendix A of this manual.
Note
Channel 2 Input is disabled when the 9250 is
configured to operate in differential output mode.
Channel 1 Output
The channel 1 output connector outputs amplified signals. When
the 9250 is configured as two separate amplifiers, this output
connector generates amplified signals that are applied to the
channel 1 input connector. If the instrument is configured for
differential output, this channel generates normal, non-inverted
signals while the other output connector generates the inverted
signal at 180
°
phase offset.
Gain at this output is fixed at 10 (or another gain factor that was
specified at the time of your purchase). Output source impedance
is one of: 50
Ω
, 75
Ω
or 600
Ω
.
Tip
Knowing your source impedance is very important
because the output gain accuracy is calibrated to
specific source impedance and therefore, any
unmatched load impedance may have an affect on