Rohde & Schwarz R&S ZVA 8 - Page 219

R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.57 E-6
Contains operators for arithmetic operations and mathematical functions. The following table
l
ists how the operators act on a complex quantity z = x + jy.
+, -, *, /
Basic arithmetic operations
()
Grouping parts of an expression
linMag
|z| = sqrt ( x
2
+ y
2
)
dBMag
dB Mag(z) = 20 * log|z| dB
Arg
Phase  (z) = arctan ( Im(z) / Re(z) )
Re, Im
x, y (Real and Imag)
log, ln
Common (base 10) or natural (base e) logarithm
Min, Max
Smaller or larger values of all points of two traces, e.g. Min(Trc1,Trc2)
StimVal
Stimulus value
*)
tan, atan, sin, asin, cos, acos
Direct and inverse trigonometric functions.
*) The function StimVal can be used for all sweep types. Please note that
-
as with all user math operands
-
only the numerical value without unit
is processed in the user math formula.
• In frequency sweeps StimVal provides the stimulus frequency in Hz, which may be
converted into a dB value (for dB Mag trace format).
• In power sweeps, StimValprovides the voltage in V that results from the source power
in dBm. To obtain the correct source power in dBm (for dB Mag trace format), Result is
Wave Quantity must be enabled. Note that, due to the conversion into a dBm value, the
source power depends on the reference impedance of the port associated with the
measured wave quantity, to be set in the Port Configuration dialog.
• In time sweeps, StimVal is the stimulus time in s.
• In CW mode sweeps, StimVal is the number of the point.
• Numeric Value
extends the Define Math dialog and opens the numeric input panel (toggle function):
The numeric input panel supports the entry of numeric values and constants. In addition to the
numbers 0 to 9, the decimal point and the constants j (complex unit), pi (approx. 3.14159) and e
(approx. 2.71828), it contains the following buttons:
• +/- changes the sign
• Exp defines a number in exponential representation, e.g. 12 exp 3 for 12*10^3 =
12000.
Products of numbers and constants may be entered in abbreviated form, e.g. 2e for 2*e.