18-35
Measure Commands
OMAMplitude
<value> is the width of the first negative pulse on the screen using the mid-threshold levels of
the waveform. If SENDvalid is ON, the <result_state> is returned with the measurement
result. Refer to Table 18-4 on page 18-39 for a list of the result states.
Example 10 OUTPUT 707;”:SYSTEM:HEADER OFF”
20 OUTPUT 707;”:MEASURE:NWIDTH?”
OMAMplitude
Command :MEASure:OMAMplitude [<source>]
On NRZ optical signals, measures the difference (absolute value) between the optical power
of a one pulse and the optical power of a zero pulse. Use this command on single-valued
waveforms in Oscilloscope mode. Measurements can be made on square waves and any other
PRBS pulse train as long as three edges are present on the display. If less than three edges
are displayed, the message
Edge? is shown on the display. To measure OMA, the average
power level of the center 20% between the first two edges is determined as well as the aver-
age power level of the center 20% between the second two edges. If the measurement is per-
formed on an electrical signal, the measurement units are reported in volts.
Restrictions Oscilloscope mode. Software revision A.07.00 and above.
<source> {CHANnel<N> | FUNCtion<N> | WMEMory<N>}
<N> For channels, functions, and waveform memories: 1, 2, 3, or 4.
Query :MEASure:OMAMplitude? [<source>]
The query returns the measured optical modulation amplitude of the specified source.
Returned Format [:MEASure:OMAMplitude] <value>[,<result_state>]<NL>
<value> is the ratio of overshoot to amplitude, in percent. If SENDvalid is ON, the
<result_state> is returned with the measurement result. Refer to Table 18-4 on page 18-39
for a list of the result states.
Example 10 OUTPUT 707;”:SYSTEM:HEADER OFF”
20 OUTPUT 707;":MEASURE:OMAMPLITUDE?"
OVERshoot
Command :MEASure:OVERshoot [<source>]
Measures the overshoot of the first edge on the screen. Sources are specified with the MEA-
Sure:SOURce command or with the optional parameter following the OVERshoot command.
The algorithm is:
If the first edge onscreen is rising, then
overshoot = (Local Vmax - Vtop) / Vamplitude
else
overshoot = (Vbase – Local Vmin) / Vamplitude.
Mode Oscilloscope mode only
<source> {CHANnel<N> | FUNCtion<N> | WMEMory<N>}
<N> For channels, functions, and waveform memories: 1, 2, 3, or 4.
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