64 Chapter 2
Front-Panel Key Reference
AMPLITUDE Y Scale
Ext Amp Gain Adds a positive or negative preamplifier gain value, which is subtracted
from the displayed signal. (Use negative values for gain and positive
values for loss.) The function is similar to the Ref Lvl Offset function,
however with the
Ext Amp Gain function, the attenuation may be
changed depending on the preamplifier gain entered. A preamplifier
gain offset is used for measurements that require an external
preamplifier or long cables. The offset is subtracted from the amplitude
readout so that the displayed signal level represents the signal level at
the input of the preamplifier. The preamplifier gain offset is displayed
at the top of the screen and is removed by entering zero. The
preamplifier gain offset can only be entered using the numeric keypad.
The preamplifier gain value is not affected by an instrument preset or a
power cycle.
Key Access:
AMPLITUDE Y Scale, More
Max Mixer Lvl
Allows you to change the maximum input mixer level from 6.99 dBµV
to 116.99 dBµV (10 dBm to −100 dBm) in 10 dB steps using the step
keys, and 1 dB steps using the knob. In addition, you may use the
keypad to specify a value. (The default unit of measure is dBµV,
however you can change the unit of measure by first pressing Y Axis
Units
key and selecting the appropriate key.) The mixer level is equal to
the reference level minus the attenuator setting. As the reference level
changes, the input attenuator setting is changed to keep the power
levels of on-screen signals less than the selected level at the input
mixer. When
Preset Type is set to Factory, pressing Preset resets the
maximum input mixer level to 97 dBµV.
Key Access:
AMPLITUDE Y Scale, More
IF Gain
Auto Fixed
When using digital resolution bandwidths (RBW < 1 kHz), the analyzer
uses IF Gain autoranging to set the optimum signal gain for digital
processing. This technique produces the maximum measurement range
without overloading the digital system. To increase measurement
speed, select IF Gain (Fixed). This setting decreases the display range to
70 dB, so you may have to adjust the reference level to ensure complete
view of the signal.
Key Access:
Amplitude, More, More
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