Function generator 1: Noise waveform, 50 Ohm, 10 Vpp
	Function generator 2: sinewave, 50 Ohm, 10 kHz, 10 mVpp, burst mode, 1100 cycles/burst, 2ms burst interval
	
	Connections:
	
	FG1 -------17 Ohm-----+
	                      |
	                      +-------17 Ohm----------+---- to ai0 of pci-6221 (pin 68)
	                      |                       |
	FG2 -------17 Ohm-----+                     50 Ohm
	                                              |
	                                         Analog Ground (FG1, FG2 and pci-6221 agnd (pin67)

	pci-6221 ai0 analog input (single-ended mode) has GigaOhm resistance.
	Direct signals and power spectra can be acquired using the TDS1012B scope and the burst TTL trigger signal from FG2. 20 MHz bandwidth filter is on.
	Synchronous signals acquired using the pci-6221 and the burst TTL trigger signal from FG2 to a digital input, pfi0 (pin 11 and digital ground pin 12).
	
	Using ain_nidaqmx_synchronous.py (SynchronousBurstWaveform function), synchronous signals in burst mode were taken using 1000 samples per burst (versus the 1100 actually in the burst), 
	and a variable number of delay values (phase shifts) over 1/2 or 1 cycle.
	
	Using Marina to acquire data yields a power spectrum that clearly distinguishes the 10 kHz signal from the noise spectrum.
	Using 100 ksps and acquiring 100 ksamples takes only 1 sec.  The analog input range was specified as 0.2, 
	a value which is occassionally exceeded by the noise in the time domain.