Stanford Research Systems SR785, Operating Manual And Programming Reference

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4-96 Tachometer Input Menu
SR785 Dynamic Signal Anaylzer
Command: TALV(?) {f}
Tach Slope
Sets the slope with which the tachometer signal must pass through the tachometer level
to trigger the tachometer [Rising, Falling].
Command: TASL(?) {i}
Hold Off Enable
Enables or disables tachometer holdoff. When tachometer holdoff is enabled, the
tachometer is prevented from triggering after a tach pulse has been received for a time
specified by the Tach Hold Off.
If the tachometer signal is not noisy in the region near the tachometer trigger threshold, it
should not be necessary to use the holdoff. If the signal is noisy, i.e. passes through the
threshold several times for a given tachometer pulse, set the holdoff time long enough to
prevent retriggering for each tach pulse.
Command: TAHO(?) {i}
Tach Hold Off
Specify the interval during which the tachometer input is prevented from triggering when
tachometer hold off is enabled.
For a noisy tachometer signal, the tachometer holdoff time should be set long enough so
that the tachometer triggers only once for each pulse on the tachometer input.
Command: TAHD(?) {f}
Show Tach
Specifies whether the RPM corresponding to the tachometer input should be displayed in
the RPM indicator location.
When the measurement group is Order, Show Tach is always On. Likewise, if the trigger
mode is RPM Arm , Show Tach is always on.
If Show Tach is off, the indicator is displayed in the same position as the RPM
indicator.
Command: TASH(?) {i}