Physical Setup
	
Chassis is on the bench in the EE shop.
	powered with a dual channel power supply with +/-18 (+18.1, -18.1)
	Current draw on positive leg is 200 mA, 100 mA on negative leg. Consistent with test report.
	Once powered on,
		All expected lights turn on.
	Connected DB25 breakout to front of chassis "Preamp Chamber Interface".
		DCPD A channel: +leg = pin 5, -leg = pin 18, BNC shields both connected to GND = pin 13.
		(DCPD B channel: +leg = pin 1, -leg = pin 14, BNC shields both connected to GND = pin 13.)
	Connected DB9 breakout to back of chassis "To AA/ADC Whitened Output"
		DCPD A channel: +leg = pin 1, - leg = pin 6, BNC shields both connection to GND = pin 5.
		(DCPD B channel: +leg = pin 2, - leg = pin 7, BNC shields both connection to GND = pin 5.)

Remember, 1:10 whitening filter is ON with the Whitening Disable relays OFF.


SR785 Setup (by hand, didn't want to waste time figuring out GPIB setup)

First, disconnect the SRC OUT from the differential amplifier.
Then factory reset the machine.

System
	Preset
		ENTER

Then setup the settings as below.

Display Options
	Display: Live
	Format: Dual
	RPM Frequency: OFF
	Grid: ON
	Grid Div: 10
	Phase Suppress: 0.0e+00
	d/dx window (%): 0.5

Display Setup
	TOP TRACE
	Measure Group: Swept Sine
	Measurement: Freq. Resp
	View: Linear (Magnitude, i.e. not in dB)
	Units: 
		dB Units: OFF
		Pk. Units: OFF
		Phase Units: deg
		dBm. ref impedance: 50

	BOTTOM TRACE
	Measure Group: Swept Sine
	Measurement: Freq. Resp
	View: Phase
	Units:
		dB Units: OFF
		Pk. Units: OFF
		Phase Units: deg
		dBm Ref. Impedance: 50

Freq
	Start: 102.4 kHz 
	Stop: 0.1 Hz 
	Repeat: Single Shot (don't continuously repeat sweep once done)
	Type: Log (log-spaced frequency vector)
	Auto Res.: OFF
	# of points: 200
	
Source
	Auto Level Ref: OFF
	Amplitude: 1.0 V_pk
	Source Ramp Rate 1 V/sec, but
	Source Ramping OFF 
	Offset 0.0 V

Input Setup 
	Input Source: Analog
	Input Configs:
		CH 1 & 2 (Both Channels)
		Mode: A-B (positive legs into A, negative legs into B)
		Coupling: DC	('cause AC coupling filter corner is 0.16 Hz)
		AA filter ON
		Wt filter OFF
		Autorange UP ONLY

		Input Range (for 1.0 V source amplitude, 150 ms / 3 cycle integration):
		CH1: +2 dBVpk
		CH2: +22 dBVpk

	Transducer Params: (all as default; unused in this style of measurement)
	Tach Input: (all as default; unused in this style of measurement)
	Playback Config: (all as default; unused in this style of measurement)
	
	Auto Offset OFF
		
Average Setup 
	Step / Impulse response of a basic 1:10 zpk filter is 0.1 sec. 
		(there's probably some math that would predict that for me, but I tossed it into matlab and asked it to do it for me.)
	Adding a 10 kHz pole *shortens* the impulse *time*, but increases the impulse *amplitude*.
	So, a settle time of order 0.1 seconds is in order.

	Frequencies higher than 0.1 sec = 10 Hz should use settle time, and below 10 Hz should use cycles (and one cycle should be plenty). 

	## Given above discussion, increased these params from 2023-01-30 measurements
	Settle Time = 150 ms (148.44 ms) (up from 100 ms)
	Settle Cycles = 1
	Integration Time = 150 ms (148.44 ms) (up from 50 ms)
	Integration Cycles = 2
with freq = [0.1 102.4e3] and 200 points, this takes 484 seconds ~= 60 minutes

Output
	Hard Copy Button ASCII Dump
	Bitmap Printer PC X 8 Bit
	Bitmap Area Graphs
	Vector / Plotter PostScript (doesn't matter, unused)
	Destination Disk File
	File Start Number 0
	

Good deal. 

Starting with A channel, whitening OFF.