Model 6220/6221 Reference Manual Averaging Filter, Math, and Buffer 6-17
Return to Section 6 topics
1. TRACe:NOTify <NRf>
<NRf> = 1 to (TRAC:POIN -1)
Use this command to specify the number of stored readings that will set bit B6
(Trace Notify) of the Measurement Event Register. With Service Request
Enable Register properly configured, an SRQ will be generated when the
specified Trace Notify value is exceeded. See Section 11 for details on status
structure.
The maximum valid parameter value for this command is one less than the
present buffer size (which can be set by the TRACe:POINTs command). For
example, assume a delta test is configured to store 1000 readings. For this
buffer size, the maximum valid parameter value for TRACe:NOTify is 999
(1000-1). When an invalid parameter value is specified, the command is
ignored and causes error -222 Parameter data out of range.
When the delta test is configured for infinite cycles, Bit B6 (Trace Notify) of the
measurement event register will clear after the 65,536th reading is stored and
the buffer wraps around to the beginning.
2. TRACe:FEED <name> parameters:
SENS1 – Pre-math delta readings are stored in the buffer.
CALC1 – Post-math delta readings. These are the results of the mX+b or
m/X+b (see "Math," on page 6-9 for details).
NONE – Disables the buffer.
3. TRACe:FEED:CONTrol <name> parameters:
NEXT – Enables the buffer and turns on the asterisk (*) annunciator. After the
buffer fills, the asterisk annunciator turns off.
NEVer – Disables the buffer.
4. TRACe:TSTamp:FORMat <name> parameters:
ABSolute – Each timestamp is referenced to the first reading stored in the
buffer.
DELTa – Timestamps provide the time between each buffer reading.
Note that the timestamp will only appear in a buffer reading is TSTamp is one
of the selected data format elements. See Section 13 for details on Format.
5. Buffer read commands:
TRACe:DATA? – Use this read command to return all stored buffer readings.
The data elements that are included for each buffer reading depends on the
selected elements for FORMat:ELEMents command (see Section 13 for
details).
TRACe:DATA:TYPE? – Use this query command to determine what kind of
readings are stored in the buffer. It returns NONE (no reading in buffer), DELT
(Delta readings), DCON (Differential Conductance readings, or PULS (Pulse
Delta readings).
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