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USING THE COMBISCOPE INSTRUMENTS 3 - 47
3.9.1.4 Check the result of the post processing function.
The results of the post processing functions :MATH
:TRANsform:FREQuency
:TRANsform:HISTogram
are stored in M1_1 for CALCulate1 and in M2_1 for CALCulate2, regardless of
the input (feed) trace.
The results of the post processing functions :FILTer:FREQuency
:INTegral
:DERivative (or :DIFFerential)
are stored in M1_n or M2_n, depending of the input source. When CHn or Mi_n
is the input trace for CALCulate1, the result is placed in M1_n (n = 1, 2, 3, 4).
When CHn or Mi_n is the input trace for CALCulate2, the result is placed in M2_n
(n = 1, 2, 3, 4).
Example:
Send
→ CALCulate2:FEED "CH3"
Send
→ CALCulate2:INTegral:STATe ON
’The result is that the integral of the channel 3 trace is placed in M2_3.
When the result of a calculation is saved in a trace memory location, the other
trace locations of the same memory register are used by the calculate process.
Data stored in these locations may be destroyed. For example, a CALculate1
process that stores the result in M1_2, may also destroy the contents of M1_1,
M1_3, and M1_4. The result of a CALCulate function that is stored in a trace
memory can be read into the controller by using the TRACe? query.
Example:
Send
→ TRACe? M2_1 ’Requests for M2_1 trace
Read
← <trace_buffer> ’Reads M2_1 trace
Note: The result of a CALCulate block can be used as source for the other
CALCulate block, but not
as source for the same CALCulate block.
PROGRAM EXAMPLE:
DIM response AS STRING
*
1033 ’
Dimensions trace buffer
CALL Send(0, 8, "CALCulate2:FEED ’CH3’", 1) ’
Channel 3 = source CALC2
CALL Send(0, 8, "CALCulate2:TRANsform:FREQuency:WINDow HAMMing", 1)
CALL Send(0, 8, "CALCulate2:TRANsform:FREQuency:STATe ON", 1)
’
Enables FFT-Hamming
CALL Send(0, 8, "TRACe? M2_1", 1) ’
Requests for M2_1 trace
CALL Receive(0, 8, response$, 256) ’
Reads the M2_1 trace