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Commands Listed in A lphabetical Order T able 2-56: Math expression elements (cont.) Element Description Example FREQuency(<wfm>) The fi rst cycle in a waveform or gated region. Frequency is the reciprocal of the pe…

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Commands Listed in Alphabetical Order
Table 2-56: Mat
h expression elements
Element Description Example
CH1-CH4
REF1-REF4
Specifies an an
alog channel or
reference waveform as the data source.
Referenced as <wfm> in the math
operators de
scriptions.
:MATH:DEFINE "FFT(C H1)"
Automatic m
easurements of waveforms
See also MEASUrement:IMMed:TYPe and MEASUrement:MEAS<x>:TYPe .
AMPlitude(<wfm>)
Thehighval
ue less the low value
measured over the entire waveform or
gated region.
:MATH:DEFI
NE
"AMPlitude(CH1)"
AREa(<wfm>)
Area measurement is a voltage over
time measurement. It returns the area
over the en
tire waveform or gated region
in volt-seconds. Area m easured above
ground is positive; area measured
below gro
und is negative.
:MATH:DEFINE "AREA( CH1)"
BURst(<
wfm>)
Burst wi
dth: the duration of a burst
(a series of transient events) and is
measured over the entire waveform or
gated re
gion.
:MATH:DEFINE "BURST (CH1)"
CARea(
<wfm>)
Cycle a
rea: a voltage over time
measurement. The measurement is the
area over the first cycle in the waveform
or the fi
rst cycle in the gated region
expressed in volt-seconds. The area
above the common reference point
is pos
itive, and the area below the
common reference point is negative.
:MATH:DEFINE "CAREA (CH1)"
CMEan(<wfm>) Cycle mean: the arithmetic mean over
the first c ycle in the w aveform or the
first
cycle in the gated region.
:MATH:DEFINE "CMEAN (CH1)"
CRM
s(<wfm>)
Cyc
le RMS: the true Root Mean Square
voltage o ver the first cycle in the
waveform or the first cycle in the gated
reg
ion.
:MATH:DEFINE "CRMS( CH1)"
DE
Lay(<wfm>,<wfm>)
Th
e time between the mid reference
(default 50%) a mplitude point of two
different waveforms. See also P hase.
:MATH:DEFINE
"D
ELAY(CH1,CH2)"
FA LL(<wfm>) The time required for the falling edge
o
fthefirst pulse in the waveform
or gated region to fall from the high
reference value (default = 90%) to the
l
ow reference value (default = 10% ) of
the final value.
:MATH:DEFINE "FALL( CH1)"
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-409
Commands Listed in Alphabetical Order
Table 2-56: Math expression elements (cont.)
Element Description Example
FREQuency(<wfm>) The first cycle in a waveform or gated
region. Frequency is the reciprocal of
the period; it is measured in hertz (Hz)
where one Hz is one cycle per second.
:MATH:DEFINE
"FREQUENCY(CH1)"
HIGH(<wfm>) This value is used as 100% whenever
high reference, mid reference, or low
reference values are needed, such as
in fall time or rise time measurements.
Calculate u sing either the min/max
or histogram method. The min/max
method uses the maximum value
found. The h istogram method uses the
most common value found above the
midpoint. This value is measured over
the entire waveform or gated region.
:MATH:DEFINE
"HIGH(CH1)*CH2"
LOW(<wfm>) This value is used as 0% whenever
high reference, mid reference, or low
reference values are needed, such as
in fall time or rise time measurements.
Calculate u sing either the min/max
or histogram method. The min/max
method uses the minimum value
found. The h istogram method uses the
most common value found below the
midpoint. This value is measured over
the entire waveform or gated region.
:MATH:
DEFINE "LOW(CH1)"
MAXimum(<wfm>)
The most positive peak voltage. Max is
measured over the entire waveform or
gated region.
:MATH:DEFINE
"MAXIMUM(CH1)"
MEAN(<wfm>)
The arithmetic mean over the entire
waveform or gated region.
:MATH:DEFINE "MEAN(CH1)"
MINImum(<wfm>)
The most negative peak voltage. Min is
measured over the entire waveform or
gated region.
:MATH:DEFINE
"MINIMUM(CH1)"
NDUty(<wfm>) Negative duty cycle: the ratio of the
negative pulse width to the signal period
expressed as a percentage. The duty
cycle is measured on the first cycle in
the waveform or gated region.
:M
ATH:DEFINE "NDUTY(CH1)"
NOVershoot(<wfm>)
Negative overshoot: this is measured
over the entire waveform or gated
region and is expressed as: Negative
Overshoot = (Low – Minimum) /
Amplitude x 100%.
:MATH:DEFINE
"NOVERSHOOT(CH1)"
2-410 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
NWIdth(<wfm>)
Negative pulse width: the distance
(time) between the mid reference
(default 50%) amplitude points of a
negative pulse. The measurement is
made on the first pulse in the waveform
or gated region.
:MATH:DEFINE "NWIDT H(CH1)"
PDUTy(<wfm>) Positive duty cycle: the ratio of the
positive pulse width to the signal period
expressed as a percentage. duty cycle
is measured on the first cycle in the
waveform or gated region.
:MATH:DEF
INE "PDUTY(CH1)"
PERIod(<wfm>) The time required to complete the first
cycle in a waveform o r gated region.
Period is the reciprocal of frequency
and is measured in seconds.
:MATH:DEFINE "PERIO D(CH1)"
PHAse(<wfm>) The amount of time that one waveform
leads or lags another waveform,
expressed in degrees where 360°
makes up one waveform cycle. See
also Delay.
:MATH:DEFINE
"PHASE(CH1,CH2)"
PK2pk(<wfm>) Peak to peak: the absolute difference
between the maximum and minimum
amplitude in the entire waveform or
gated region.
:MATH:DEFINE "PK2PK (CH1)"
POVershoot(<wfm>)
Positive overshoot: this is measured
over the entire w aveform or gated
region and is expressed as: Positive
Overshoot = (Maximum – High) /
Amplitude x 100%.
:MATH:DEFINE
"POVERSHOOT(CH1)"
PWIdth(<wfm>) Positive pulse width: the distance (time)
between the mid reference (default
50%) amplitude points of a positive
pulse. The measurement is made on
the first pulse in the waveform or gated
region.
:MATH:DEFINE "PWIDT H(CH1)"
RISe(<wfm>) The time required for the leading edge
of the first pulse in the waveform
or gated region to rise from the low
reference value (default = 10%) to the
high reference value (default = 90%) of
the final value.
:MATH:DEFINE "RISE( CH1)"
RMS(<wfm>) The true Root Mean Square voltage
over the entire w aveform or gated
region.
:MATH:DEFINE "RMS(C H1)"
SINe<wfm> Sine measurement of <wfm>
:MATH:DEFINE "SINE( CH1)"
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-411