Fluke PM3370B user manual Hold OFF

FUNCTION REFERENCE 5 - 37

Key sequence:

Toggle key to select positive or negative glitch detection.

Toggle softkey to select positive or negative glitch detection.

Softkey pair to select the additional trigger condition.

Control to adjust the conditional time or the beginning of the range.

Control to adjust the end of the range.

HOLD OFF

Description:

The HOLD OFF control determines the hold off time.

In the analog mode, the hold off time is an additional ‘dead’ time after each timebase sweep during which the MAIN TB trigger is inhibited. Variable HOLD OFF enables the user to synchronize the display rate to the signal being examined. This eliminates the problem of ‘double’ triggering on pulse train information as shown in the figure.

For most signals the hold off must be minimal (0%), so that the sweep repetition rate can be the highest permitted by the trigger signal. Turning the HOLD OFF control clockwise increases the hold off time. When the hold off time is set longer than is necessary to synchronize the signal, loss of light output will result.

In the digital mode, the variable hold off time serves a similar function, and the extra time is used for processing previously captured data.

In digital mode, triggering on certain pulses can be achieved via the logic trigger mode ’pattern’. For details refer to the LOGIC TRIGGER function.