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Key Function Descriptions
Key Descriptions
Appears only when NORMLIZE ON OFF is set to
RANGE LVL
ON.Activates the dynamic-range-level function, which
corresponds to the top of the display in dBm. RANGE
LVL ensures that the displayed range is
compression-free by adjusting the input attenuator and
IF gain accordingly. RANGE LVL is equivalent to REF
LVL, which is commonly used in signal-analysis
measurements.
When in normalized mode, NORM REF LVL and
NORM REF POSN affect the value of the top of the
display (that is, the top of screen does not necessarily
represent the gain compression limit). If the actual
measured signal is beyond the gain compression limit,
or below the bottom line of the graticule, the error
message ERR 903 A > DLMT will appear. Adjusting
RANGE LVL until the error message disappears,
assures the user that the measured signal level is no
longer beyond the measurement limits of the
instrument. If the signal of interest is both above the
gain compression limit and below the bottom line of the
graticule, changing RANGE LVL does not clear the
error message. Refer to Chapter 2 for a measurement
example using RANGE LVL.
ERR 904 B > DLMT appears in normalized mode only if
any one of the following conditions occur:
• Any data point of the calibration trace is off-screen.
• No calibration has been performed after a preset.
• Trace B is blank.
To ensure valid calibration trace data, readjust
analyzer settings, turn normalize off, and perform a
CAL THRU or CAL OPN/SHRT operation.
RANGE LVL can be adjusted from +30 dBm to −120
dBm using the data keys, step keys, or the knob.
Front-panel key access:
Displays the value of the oscillator frequency which is
RAW OSC FREQ
used to generate the fractional N frequency. The
fractional N frequency is one-half of the raw oscillator
frequency divided by the post scaler. See the
POSTSCLR softkey.
Front-panel key access:
268
or
AMPLITUDE
AUX CTRL
CAL
Chapter 4
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