Fluke PM-3370B Setting, Trace Point Frequencies, Fs = sampleindex * 1250 / TRACePOINts * MTB

USING THE COMBISCOPE INSTRUMENTS									3 - 53
SUMMARY OF CALCULATED OFFSET VALUES:
ATTENUATOR					dBm-50Ω:		dBm-600Ω:		dBμV:
SETTING:			Vrms:
5	V/div	+	11.18034	+	33.9794	+	23.187588	+ 140.9691
2	,,	+	4.4721359	+	26.0206	+	15.228787	+ 133.0103
1	,,	+	2.236068	+	20.0	+	9.2081872	+ 126.9897
0.5	,,	+	1.118034	+	13.9794	+	3.1875874	+ 120.9691
0.2	,,	+	0.4472136	+	6.0206	-	4.771213	+ 113.0103
0.1	,,	+	0.2236068		0.0	-	10.791813	+ 106.9897
50	mV/div	+	0.1118034	-	6.0206	-	16.812413	+ 100.9691
20	,,	+	0.0447214	-	13.979392	-	24.771206	+	93.010308
10	,,	+	0.0223607	-	20.0	-	30.791813	+	86.989708
5	,,	+	0.0111803	-	26.020632	-	36.812444	+	80.96907
2	,,	+	0.0044721	-	33.97947	-	44.771282	+	73.01023

Note: The PROGRAM EXAMPLE on the next page shows how it is programmed.

TRACE POINT FREQUENCIES:

The horizontal frequency values (in Hz per point) are calculated from the trace sample index (point number of the sample in the trace), the acquisition length (TRACe:POINts), and the MTB (calculated from the SENSe:SWEep:TIME) by the following equation:

Fs = (<sample_index> * 1250) / (TRACe:POINts * MTB * 50)

Restriction: Only trace sample data can be queried from trace memories; no trace administration data, such as acquisition length and MTB value. This means that these values must be queried from the actual input channel signal, which is taken as the source for the FFT process. So, take care that the acquisition length nor the MTB is changed between activating the post processing function and reading the trace memory where the post processing trace is stored.