User`s guide

246 53220A/53230A User’s Guide
7 Formats and Data Flow
DATA:POINts?
The reading count can be read before the total reading count is reached
(TRIGger:COUNt x SAMPle:COUNt).
Setting a Reading Threshold in Memory
The following command allows you to set a reading threshold in the counter’s
volatile memory:
DATA:POINts:EVENt:THReshold <count>
DATA:POINts:EVENt:THReshold? (query form)
- when count number of readings have entered reading memory, bit 12 (Rdg
Mem Threshold) in the Standard Operation Register is set to ‘1’. By monitoring
this bit, readings can be transferred from memory to the output buffer once a
given number of measurements have occurred.
Once the threshold is reached, the number of readings in memory must drop
below the threshold level in order to detect when the threshold is reached
again.
Memory Threshold Example
(Note, this example is also contained on the Agilent 53210A/53220A/53230A
Product Reference CD ROM.)
This program sets up the counter to take 1,250,000 readings. Because volatile
reading memory capacity is 1,000,000 readings, readings will be over-written
(memory overflow) if data is not retrieved before memory fills. To prevent
memory overflow, a reading threshold is set and monitored. When the number
of readings in memory reaches the threshold, all readings in memory at that
time are retrieved.