TRACe:POINts?
Syntax
TRACe:POINts? {(@<channel>)|<slot>}, <name>
Description
This command returns the number of points (samples) used by the trace waveform.
Used With:
34950A Digital I/O Module (digital output channels only)
34951A Isolated DAC Module
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<channel> |
Numeric |
One channel in the form (@sccc). Select from s101 through s104, s201 through s204. |
This is a required parameter |
|
<slot> |
Discrete |
{1|2|3|4|5|6|7|8} |
This is a required parameter |
|
<name> |
ASCII String |
A previously-defined trace name consisting of up to 12 characters. |
This is a required parameter |
Remarks
The specified trace must have been previously assigned to a channel in the specified slot (see SOURce:DIGital:MEMory:TRACe command for the 34950A or SOURce:FUNCtion:TRACe[:NAME] command for the 34951A).
Each bank on the 34950A has its own memory (64K bytes each) for use in buffered output transfers. You can download up to 32 traces into each bank.
You can store up to 512,000 trace points per 34951A module.
For the 34950A, if you change the width of a bank (see CONFigure:DIGital:WIDTh command), all traces in memory are cleared.
A Factory Reset (*RST command), Instrument Preset (SYSTem:PRESet command), and Card Reset (SYSTem:CPON command) deletes the trace from memory and removes all trace name associations.
Return Format
The query command reads the number of trace samples (34950A) or trace points (34951A) used by the specified trace. The number of samples (points) is returned in the form "+100".
Examples
The following program segment downloads a 32-sample count-up trace to memory on channel 101 on the 34950A in slot 3 and then reads the number of trace samples.
TRAC:DIG:FUNC
(@3101),COUN,DOUT1,32 !Download
32-sample trace to memory
SOUR:DIG:MEM:TRAC DOUT1,(@3101) !Assign
trace to channel 101
TRAC:POIN? (@3101),DOUT1
Typical Response: +32
The following program segment downloads a 100-point sine waveform to memory on the 34951A in slot 4 and then reads the number of trace points.
TRAC:FUNC 4,SIN,
TEST_SINE, 100 !Download
100-point sine to memory
SOUR:FUNC:TRAC TEST_SINE,(@4001) !Assign
trace to channel 1
TRAC:POIN? 4,TEST_SINE
Typical Response: +100
See Also
SOURce:DIGital:MEMory:TRACe