Fluke PM-3394B, PM-3380B, PM-3390B, PM-3370B Reading trace acquisitions, The trace acquisition flow

USING THE COMBISCOPE INSTRUMENTS 3 - 29

3.4.2Reading trace acquisitions

Once acquisitions are completed, the resulting traces ares placed in TRACe memory, as shown in the following figure.

@1

@2

@3

@4

INPut

INPut[1]

INPut2

INPut3

INPut4

SENSe

:VOLTage[1]

:VOLTage2

:SWEep

:VOLTage3

:VOLTage4

Main Time Base

TRACe

memory

CH 1

CH 2

CH 3

CH 4

ST7160

Figure 3.10 The trace acquisition flow

The last acquired trace at input channel 1 is placed in the TRACe memory element named CH1. The trace acquired at channel 2 in CH2, etc. This trace data can be read by using the TRACe[:DATA]? query.

Example:

TRACe? CH2 Returns the trace that was last acquired at input channel 2.

When new acquisitions are executed, the previously stored traces are not automatically saved, but overwritten by the new result. When these traces need to be saved, they have to be copied into other TRACe memory elements, before a new acquisition is initiated. Refer to section 3.10.2 "Copying traces to memory" for a description about how to copy traces.

As response to the TRACe? query the data is returned as block data. Section 3.4.3 "Conversion of trace data" specifies the coding of this data and describes how to convert this data into voltage values.