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18-15
Measure Commands
FREQuency
Measures the time at the upper threshold of the falling edge, measures the time at the lower
threshold of the falling edge, then calculates the fall time. Sources are specified with the
MEASure:SOURce command or with the optional parameter following the FALLtime com-
mand. The first displayed falling edge is used for the fall-time measurement. Therefore, for
best measurement accuracy, set the sweep speed as fast as possible while leaving the falling
edge of the waveform on the display.
Fall time = time at lower threshold point – time at upper threshold point.
<source> is {CHANnel<N> | FUNCtion<N> | RESPonse<N> | WMEMory<N> | CGRade} where
CHANnel<N>, FUNCtion<N>, RESPonse<N> and WMEMory<N> apply in Oscilloscope and
TDR modes only, and CGRade in Eye mode only. <N> for channels, functions, TDR responses
and waveform memories is 1, 2, 3, or 4.
Mode All instrument modes.
Query :MEASure:FALLtime?[<source>]
The query returns the fall time of the specified source.
Returned Format [:MEASure:FALLtime] <value>[,<result_state>]<NL>
<value> is the time at lower threshold – time at upper threshold. If SENDvalid is ON, the
<result_state> is returned with the measurement result. Refer to Table 18-3 on page 18-30
for a list of the result states.
Example 10 OUTPUT 707;”:SYSTEM:HEADER OFF”
20 OUTPUT 707;":MEASURE:FALLTIME?"
FREQuency
Command :MEASure:FREQuency [<source>]
Measures the frequency of the first complete cycle on the screen using the mid-threshold lev-
els of the waveform (50% levels if standard measurements are selected). The source is speci-
fied with the MEASure:SOURce command or with the optional parameter following the
FREQuency command.
The algorithm is:
If the first edge on screen is rising, then
frequency = 1/(time at second rising edge – time at first rising edge)
else,
frequency = 1/(time at second falling edge – time at first falling edge).
<source> is {CHANnel<N> | FUNCtion<N> | WMEMory<N>}. <N> for channels is dependent
on the type of plug-in and its location in the instrument. For functions: 1 or 2. For waveform
memories (WMEMORY): 1, 2, 3, or 4.
Mode Oscilloscope mode only
Query :MEASure:FREQuency? [<source>]
The query returns the measured frequency.
Returned Format [:MEASure:FREQuency] <value>[,<result_state>]<NL>