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TDS5000B Online Programmer Guide

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MATH<x>:SPECTral:REFLEVELOffset

Description

This command sets or returns the spectral level offset used for calculat-

ing the dB value for the specified math waveform. The Math waveform

is specified by x, which ranges from 1 through 4 for four--channel in-

struments or 1 through 2 for two --channel instruments. Changing the

reference level offset causes the spectral waveform to move vertically,

with respect to zero dB. 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 Offset box.

Group

Math

Related Commands

MATH<x>:SPECTral:REFLevel

Syntax 1

MATH<x>:SPECTral:REFLEVELOffset {DBM|<NR3>}

Syntax 2

MATH<x>:SPECTral:REFLEVELOffset?

Arguments

H DBM

This specifies the reference level used for calculation to be equivalent

to1mWinto50Ù(ZerodBwilloccuratthislevel).

H <NR3>

This specifies the reference level used for calculation of the decibel

value when the output units are Log.

Example 1

MATH1:SPECTral:REFLEVELOFFset 0.5

This sets the reference level for the Log calculation for decibel to be

0.5. dB = A x Log(y/<NR3>) where A is 10 if the input units are watts

and A is 20 if the input units are otherwise.

Example 2

MATH1:SPECTral:REFLEVELOffset DBM

This sets the decibel reference to be equivalent to 1 mW into 50 Ù. The

reference level numerical value will depend on the input units. If the

units are volts, the value is set to 0.2236 V; if the units are amperes, the

value is set to 40 µA; if the units are watts, the value is set to 0.001 W.

Tektronix TDS5000B Series Online Programmer Guide

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