Tektronix TDS5000B Series

TDS5000B Online Programmer Guide
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MATH<x>:SPECTral:REFLevel
Description
This command specifies the vertical position of the output data from the
spectral analyzer on the display screen for the specified math wave-
form. The numerical value represents the position at the top of the dis-
play graticule. The Math waveform is specified by x, which ranges
from 1 through 4 for four--channel instruments or 1 through 2 for two--
channel instruments. This command is equal to selecting Spectral Setup
from the Math menu, choosing the Mag tab and then entering a value in
the Reference Level box.
Group
Math
Related Commands
MATH<x>:SPECTral:REFLEVELOffset
Syntax 1
MATH<x>:SPECTral:REFLevel <NR3>
Syntax 2
MATH<x>:SPECTral:REFLevel?
Argument
H <NR3>
This is the position that represents the top of the display screen grati-
cule. The range depends on the units and both the MATH<x>:VERTi-
cal:SCAle and MATH<x>:VERTical:POSition settings.
Example 1
MATH1:SPECTral:REFLevel -10
This sets the top of the display screen to be a reference level of --10 dB.
If the vertical scale is LINEAR, then the vertical units will be the same
as the input waveform.
Example 2
MATH1:SPECTral:REFLevel?
This query might return
:MATH1:SPECTRAL:REFLEVEL 2.0000E+01
indicating that the top of the display screen is set to a reference level of
20 dB.