MDO3000 Programmer Manual.pdf - 第443页
Commands Listed in Alphabetical Order T able 2-56: Math expression elements (cont.) Element Description Example +,-,*,/ Addition, subtraction, multiplication, and division operators < “Less than” operator :MATH:DEF IN…
Commands Listed in Alphabetical Order
Table 2-56: Math expression elements (cont.)
Element Description Example
TOVershoot<wfm> Total overshoot is the summation of
positive overshoot and the absolute
value of negative overshoot.
Trigonometric operations on expressions
ABS(<expr>) Absolute value of (<expr>)
:MATH:DEFINE
"ABS(CH2-CH1)"
COSINE(<expr>) Absolute value of (<expr>)
:MATH:DE
FINE "COSine(CH1)"
DEG(<expr>) Converts (<expr>) from radians to
degrees
:MATH:DE
FINE "CH1 *
DEG(VAR1)"
DIFF(<expr>) Differential of (<expr>)
Executes a differentiation operation on
the expression that follows. Measures
the slope of a curve at each point on the
input waveform.
:MATH:DEFINE "DIFF(CH1)"
:MATH:DEFINE
"DIFF(
ABS(CH1))"
EXP(<expr>) Base of natural logarithm constant "e"
raised to the power of (<expr>)
:MATH:DEFINE
"EXP(DIFF(CH1))"
FFT(<expr>) Executes a Fast Fourier Transform
operation on the expression that follows.
Calculates the set of frequencies that
are present in the input waveform.
NOT
E. If the FFT operator
is used, it needs to be the
outer-most operator.
:MATH
:DEFINE "FFT(CH1)"
:MATH:DEFINE
"FFT(CH1+CH2)"
:MAT
H:DEFINE "FFT(CH1+
INT(CH2))”
Not acceptable:: :MATH:DEF INE
“CH
1 + FFT(CH2)”
INTG(<expr>) Integral of (<expr>)
Executes an integration operation on
th
e expression that follows. Measures
the accumulated area under the input
waveform.
:MATH:DEFINE "INTG(CH1)"
:MATH:DEFINE
"INTG(CH1+CH2)"
LOG(<expr>) Base 10 logarithm of (<expr>)
:MATH:DEFINE "LOG(CH1)"
RAD(<expr>) Converts (<expr>) from degrees to
radians
:MATH:DEFINE
"RAD(PHASE(CH1,CH2))"
SQRT(<expr>) Square root of (<expr>)
:MATH:DEFINE
"SQRT(SINE(CH1))"
SINe<expr>) Sine of (<expr>)
:MATH:DEFINE
“SINE(CH1+CH2)”
TAN(<expr>) Tangent of (<expr>)
:MATH:DEFINE "TAN(CH1)"
TRE(<expr>) Trend plot of <expr>
:MATH:DEFINE
"TRE(PERIOD(CH1))"
User-defined variables
VAR1, VAR2
Specify the variables using the
MATHVAR:VAR<x> command.
:MATH:DEFINE "VAR1+CH1"
Relational and logical operators
2-412 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Table 2-56: Math expression elements (cont.)
Element Description Example
+,-,*,/
Addition, subtraction, multiplication, and
division operators
<
“Less than” operator
:MATH:DEFINE "(CH1 < CH2)"
>
“Greater than” operator
:MATH:DEFINE "(CH1 > CH2)"
<=
“Less than or equal to” operator
:MATH:DEFINE "(CH1 <=
CH2)"
>=
“Greater than or equal to” operator
:MATH:DEFINE "(CH1 >=
CH2)"
!= “Not equal to” operator
:MATH:DEFINE "(CH1 !=
CH2)"
==
“Equal to” operator
:MATH:DEFINE "CH1== CH2"
|| Logical “OR” operator
:MATH:DEFINE "(CH1 != CH2)
|| (CH3 == CH4)"
&& Logical “AND” of expressions
:MATH:
DEFINE "(CH1 != C H2)
&& (CH3 == CH4)"
!( “NOT” function, which changes
non-zero values to zero, and zero
value
sto1.
:MATH:DEFINE "(CH2- CH1) *
!(CH1 >= CH2)"
+-, 0-9, ., 0-9, E , +-, 0-9
Spec
ifies a numeric value in (optional)
scientific notation (for example:
2.34E-9).
:MATH:DEFINE "1E2"
Examples
Some examples of DUAL math expressions are as follows:
MATH1:DEFINE "CH1+CH2" adds the Ch 1 waveform and Ch 2 waveform,
storing the results in Math 1.
MATH:DEFINE? might return :MATH1:DEFINE "CH2*REF2" as the expression
t
hat defines Math 1.
Some examples of
FFT math expressions are as follows:
MATH:DEFINE "FFT(CH1)"
MATH:DEFINE "FFT(REF1)"
MATH:DEFINE "FFT(RF_NOR MAL)"
Some examples of ADV anced math expressions are as follows:
MATH:DEFINE "AMPLITUDE( CH1) * ( VAR1 + CH 2) - CH3"
MATH:DEFINE "SINE(CH1)* (VAR1+CH2)*CH3 - CAREA(C H4)"
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-413
Commands Listed in Alphabetical Order
MATH:DEFINE "I
NTG(1+CH1) + SINE(CH1)*(VAR1+CH2)*CH 3 -
CAREA(CH4)"
Some examples of SPE CTRUM math expressions are as follows:
MATH:DEFIN
E "RF_NOR MAL - RF_ AVERAGE"
MATH:DEFINE "RF_NORMAL * RF_AVERAGE"
MATH[1]:HORizontal:POSition
This command specifies the math horizontal display position for FFT or (non-live)
math reference waveforms.
Group
Math
Syntax
MATH[1]:HORizontal:POSition <NR3>
MATH[1]:HORizontal:POSition?
Arguments
<NR3> is a floating point number that specifies the % of the math waveform that
precedes center screen. It can vary from 0.0 to 100.0.
Examples
MATH:HORIZONTAL:POSITION 10 sets the horizontal position to 10% pretrigger
MATH[1]:HORizontal:SCAle
This command specifies the math horizontal display scale for FFT or for dual
math waveforms that have source waveforms that are reference waveforms. The
horizontal scale of a dual math waveform with a channel source waveform is set
through the command.
Group
Math
Syntax
MATH[1]:HORizontal:SCAle <NR3>
MATH[1]:HORizontal:SCAle?
Arguments
<NR3> is a floating point number that specifies the math horizontal scale, in
seconds.
2-414 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual