Meas Setup:
- UK Satamp D0900900, S1100173
- Suspension Satellite Amplifier Test Board: D1000878, ensuring 
	. series resistor connected to PD K (cathode) is 240 kOhm-ish.
	. INPUT and NOISE OUTPUT knobs are in sync to match input and output channels.
- Dual output DC power supply (set to +/-18V).
- SR785 (no need for accessory box this time).

(0) w/ DC power supply output OFF, set up banana to 3W3 power cable, and that voltage between pin 1 and pin 2 is +18V, and between pin 3 and pin 2 is -18V. 
Then 
SHUT OFF POWER SUPPLY OUTPUT

(1) Use ribbon cable, or some other D25F (at D1000878) to D25M (at D0900900), 
to connect D1000878 J1 to D0900900 J1 VACUUM TANK

(2) Use ribbon cable, or some other D25M (at D1000878) to D25F (at D0900900), 
to connect D1000878 J2 to D0900900 J2 ANALOGUE RACK

(3) Connect DC power supply to 3W3 P1, turn ON output to DC power supply. Wait ~5 seconds, then confirm that the FAULT lights go OFF (instead of RED), and that +5V and +/-14V power supply lights are ON (green). 

(4) SR785 SRC Setup 
Make sure SR785 SRC is OFF and/or not driving anything.

Use BNC T and two BNC cables to connect SR785 source to 
	- CH1 A, (CH1 B terminated with 50 Ohm BNC terminator)
	- D1000878 BNC INPUT (J5).

(5) SR785 Readback Setup
Use wonky clip-doodle setup:
	(a) Attach 1x BNC-to-Clip-Lead adapter to D1000878 BNC NOISE OUTPUT (J7). 
		The red clip is PD Whitened Out (+), and the black clip is PD Whitened Out (-)
	(b) Using 2x more BNC-to-Clip-Lead adapters, connect 
		- 2x red signal clips to (a) adapter's black and red clips
		- 2x black shield clips to shield of BNC INPUT from (4).
	(c) Keeping track of which of the 2x adapters is attacted the (a) adapter's red clip, use BNC to BNC cables to connect 
		- PD Whitened Out (+) to CH2 A
		- PD Whitened Out (-) to CH2 B

Ready to measure!

SR785 Settings Setup

Display Options
	Display Live
	Format Dual
	RPM frequency OFF
	Grid ON
	Grid Div 10
	Phase Suppress 00e+00
	d/dx window 0.5%

Display setup -- 
	TOP TRACE
	Measurement Group Swept Sine
	Measurement Freq. Resp.
	View Log Mag
	Units >
		dB Units OFF
		Pk. units OFF
		Phase units DEG
		dBm. ref: 50

	BOTTOM TRACE
	Measurement Group Swept Sine
	Measurement Freq. Resp.
	View Phase
	Units >
		dB Units OFF
		Pk. units OFF
		Phase units DEG
		dBm. ref: 50

Freq setup
	Start 1 kHz (sweeps down in frequency)
	Stop 0.05 Hz (set up everything with a 1 Hz lower limit for staters)
	Repeat Single Shot
	[Frequency Spacing] Type log
	Auto resolution OFF
	# points 50 pts
	
Source setup -- 
Remember -- UK Satamp D0901284-v4 has max gain of 27.67 [V/V] above ~20 Hz, so scale input voltage accordingly! 
The D1000878-v1 I have has R2 set to 242 kOhm.
D0900900, S1100173 has (R102, R202, R302, R402) = (120.1, 120.1, 120.1, 120.0).


SR785 SRC
	Autolevel ref OFF
	Amplitude == +0.3 V_pk single ended
		Means PD K input gets a current of V = I R
		I_IN = V_SRC / R_series 
		     = +0.3 [V_pk_SE] / 242e3 Ohm 
		     = 1.2397e-06 [A_pk], 
		and that's read out by the TIA stage as
		V_TIAOUT = - I_IN * R_TIA 
		         = - V_SRC (R_102/R_series)
		         = - 0.1489 [V_pk_SE]
		and the Whitening Stage has
		V_WHOUT = G * V_TIAOUT
		where max ( |G| ) = - 27.7 [V/V]
			= +4.1241 [V_pk_SE]
		which is mapped to each leg of the differential driver, so
		V_OUT+ = -1 * V_WHOUT
		V_OUT- = +1 * V_WHOUT
		V_OUT = (V_OUT+) - (V_OUT-)
		      = -8.2482 [V_pk_DIFF]
		
		But, connected as described above with 
			. V_OUT+ connected to CH2 A,
			. V_OUT- connected to CH2 B,
		each SE input sees +4.1241 [V_pk_SE], 
		which is below the 5V max input of the SR785 inputs.
		
	Source Ramping OFF, but
	Source Ramp Rate 1 V/sec
	Offset 0.0 V

Input Setup -- 
	Input Source - Analog
	Input Config (both channels)
		Mode A-B (positive legs into A, negative into B)
		Coupling DC << high pass for SR785 AC coupling is 0.16 Hz, plan on measuring down to 0.05 Hz, so turn it off.
		AA filter ON
		Wt filter OFF
		Autorange UP ONLY
	CH1 input range 
		-10 dBVpk (for V_SRC = 0.3 [V_pk_SE])
	CH2 input range 
		+26 dBVpk
	Tnsdcr Params (all as default; not used)
	Tach Input (all as default; not used)
	Playback Config (all as default; not used)
	Auto Offset OFF

Average Setup --
	Settle Time 1 s ^^^^^
	Settle Cycles 2 ^^^^^
	Integration Time 2000 [ms] ****
	Integration Cycles 5 *****
	(1 Hz lower freq bound means measurement takes 172s)
	(0.5 Hz // 305 s)
	(0.2 Hz // 676 s)