Chapter 2 33
Instrument Functions: A - L
AMPLITUDE / Y Scale
Instrument Functions: A - L
2.1 AMPLITUDE / Y Scale
Activates the Reference Level function and displays the Amplitude menu keys. These
functions control how data on the vertical (Y) axis is displayed and corrected, and control
instrument settings that affect the vertical axis.
2.1.1 Ref Level
Enables you to adjust the absolute amplitude represented by the top graticule line on the
display (the reference level). Ref in the upper left corner of the display, indicates the
current value. The
Amplitude, Y Axis Units setting determines the Reference Level units. To
change the reference level, use the front-panel step keys, knob, or numeric keypad.
Key Path:
AMPLITUDE / Y Scale
Dependencies/
Couplings: If you reduce the Attenuation setting, the analyzer may have to lower the
Reference Level to maintain the proper level at the top of the screen. If you
then increase Attenuation, the Reference Level does not increase to its
previous value.
When the input attenuator is auto-coupled,
Attenuation (Auto), its setting
may be affected by changes in the reference level setting. See
“Attenuation” on page 34.
Reference level is affected by: Attenuation, Preamp, Ext Amp Gain,
Reference level offset, Max Mixer Level, Y-Axis Units.
State Saved: Saved in Instrument State
Factory Preset: 0 dBm
Range: Determined by the settings of the input attenuator, reference level offset,
external amplitude gain, and whether the preamp (Option 1DS) is on or
off.
Examples:
−170 dBm to 30 dBm with zero reference level offset
−180 dBm to 20 dBm with 10 dB ext amp gain
−160 dBm to 40 dBm with 10 dB reference level offset
−170 dBm to 0 dBm with preamp on (Option 1DS)
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