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FUNCTION REFERENCE 5 - 75
TIME MEASUREMENTS
Description:
Time measurements can be made using the cursors or using automated,
calculated measurement routines. Cursors operate in the
analog
mode as well as
in the
digital
mode.
Calculated time measurements are available in the digital mode only.
Using the
cursors
, three time interval readouts can be selected:
- ∆T gives the time interval (seconds) between the cursors.
-1∆T gives an inverted readout of the time interval, and is read in Hz.
- ∆T-ratio gives a percentage (%) that can be reset by using the ∆T=100% softkey.
For more details, refer to CURSORS READOUT.
In the
digital
mode, the MEASURE menu accesses automatic time
measurements. This menu is reached via the key sequence ‘MEASURE >>
MEAS 1(2) >> time’. The TRACK control us used to select the type of
measurement and the ∆ control is used to select the waveform.
The result of the measurement is displayed in the top left corner of the screen.
The following measurements are
possible:
(Refer to section MEASURE MENU
for details of signal parameters).
- freq (FREQUENCY).
Measures the reciprocal of the PERIOD of the signal. Frequency is calculated
between the first and third mesial of the signal. At least one complete signal
period must be acquired to get a valid measurement.
ST6744
1−
DISTAL
MESIAL
PROXIMAL
RISE
FALL
PULSE
PERIOD
freq =
time of 3rd mesial - time 1st mesial
1