Section 9 Details on Device Messages
9-36
9.27 DMK [∆ Marker]
■ Function
Sets the ∆ marker with a wavelength and reads the differences in wavelength and
level between the ∆ marker and the trace marker.
Header Program Query Response
DMK DMK λ DMK ? ∆ λ , ∆ l
∆ f , ∆ l
■ • Value of λ
λ is a wavelength value.
The unit is nm or THz. Input a wavelength down to the fourth decimal place and
input a frequency down to the fifth decimal place.
Data range: Start wavelength ≤ λ ≤ Stop wavelength
• Value of ∆λ
∆λ is the difference in wavelength between the ∆ marker and the trace marker.
The unit is always nm. A value is output down to the fourth decimal place.
• Value of ∆f
∆f is the value of the frequency of ∆λ.
• Value of ∆l
∆l is the difference in level between the ∆ marker and the trace marker. The level
difference andthe unit on the specified scale are output.
When the log scale is selected, a value is output down to the second decimal
place. When the linear scale is selected, a value is output down to the third deci-
mal place.
If analysis is impossible, –1 is output. (Linear scale only)
■ Suffix
∆l
Log scale: DB
Linear scale: No unit
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