Manualshelf

User`s guide

ManualsBrandsAgilent Technologies ManualsMultimeter34410A
771772773774775776777778779780
Remarks
This command is supported by the 34411A and L4411A, but not the
34410A.
The 34411A/L4411A provides the pre-trigger feature for all measurement
functions except CONTinuity and DIODe test.
Use the SAMPle:COUNt command to set the sample count (the total
number of samples to take), and then use the SAMPle:COUNt:PRETrigger
command to set the pretrigger sample count (the number of pretrigger
samples to take). For example, you could set the sample count to 50,000,
and then set the pretrigger sample count to 20,000. In this case, up to
20,000 samples are taken before the trigger, and then 30,000 samples are
taken after the trigger is detected.
But, of course, the sample count and pretrigger count do not affect
when the trigger occurs. If the memory allocated for pretrigger
samples fills up, the oldest readings are discarded. In our example, up
to 20,000 pretrigger samples may be taken. This means that the
20,000 most recent pretrigger samples will be saved, even if more
than 20,000 samples occur before the trigger.
On the other hand, the trigger might occur before the pretrigger count
is satisfied. In this case, only the actual pretrigger samples taken are
saved.
In all cases, after the trigger is received, only sample count minus
pretrigger count readings are taken. In our example, the pretrigger
count is set to 20,000. Even if the trigger occurs after 5 pretrigger
samples have been taken, only 30,000 post-trigger samples will be
taken. This is because memory was reserved for 20,000 pretrigger
samples (out of the sample count = 50,000).
If a trigger occurs during a measurement, that measurement is considered
to be a pretrigger sample.
After setting the sample count and pretrigger sample count, you must
place the meter in the "wait-for-trigger" state using the INITiate or READ?
command. An external trigger will be buffered until the meter is in the
"wait-for-trigger" state.
The pretrigger sample count must be less than the sample count set with
the SAMPle:COUNt command (in fact, there must be at least one post-