Standard settings¶

Standard measurement conditions and GUI defaults. The values come from config.py (standard conditions fixed by measurements in 2026-07) and the GUI source code.

Sensor and bias¶

Item	Value	Notes
HV (sensor bias)	−190 to −195 V (at a sensor temperature of 33 °C). Changed with temperature. Limit −220 V	Matsusada P4L650-0.1, manual. The reference value in the GUI status bar is −185 V
LV (readout board)	6.0 V (fixed)	Rohde & Schwarz NGP800 series, manual. CH1
Current limits	HV 1.0 mA, LV 1.0 A	Normal currents: HV about 0.4–5 µA (display 0.0 mA), LV about 0.450 A
Power-on order	After the other equipment, LV → HV	The other equipment can be powered on in any order
Readout	C1=J8, C2=J7, C3=J6, C4=J5	Standard sensor

Oscilloscope (contents of [★ Apply Standard Settings ★])¶

Item	Value
Trigger	Source EXT, coupling DC, slope POS, level 410 mV
Timebase	1 ns/div
Horizontal offset	−53 ns (display range +48 to +58 ns)
Vertical	C1–C4: 50 mV/div, offset +100 mV (display range −300 to +100 mV)
Input coupling	DC 50 Ω (D50)
Averaging	OFF
Sampling	10 GS/s (setting in the analysis note)

Laser¶

Item	Value	Notes
Trigger source	internal (ts=0)	The laser is the reference clock
Rep. rate	1 MHz	The GUI standard since the 2026-11-01 version (the preset reads "1 MHz (standard)"). In older versions the initial value was 1.25 MHz
TUNE	manual 50 %	Adjusted to MIP-equivalent at 1 MHz. 0 % strongest, 100 % weakest
One-click setting	[★ Apply Standard Settings (1 MHz / TUNE manual 50% = MIP equiv.) ★]	Sends the three items above (internal, 1 MHz, manual 50 %) in one go. The values come from `laser_freq_hz`, `laser_tune_auto` and `laser_tune_percent` in `config.py`
Camera light	OFF during measurement	Operated by hand inside the dark room
TUNE optimization: single-CH target	200 mV (PKPK)
TUNE optimization: adjacent 2-ch sum target	64 mV	MIP-equivalent value at the strip midpoint from the DESY beam test (2026)
TUNE optimization: tolerance / coarse sweep step	±1 mV / 2 %	Fine sweep in 0.5 % steps

Stage¶

Item	Value
Travel	2 µm/pulse (X, Y and Z, confirmed)
Speed	Start 1000 pps, max 10000 pps (= 20 mm/s), acceleration 200 ms
Jog steps	2, 4, 10, 20, 50, 100, 500, 1000, 5000 µm

Alignment¶

Item	Value
Z Focus	Range ±20 µm, step 2 µm, mode "Min amplitude (focus)"
Z measurement position	On silicon, 80 µm beside the electrode center
X-edge detection position	50 µm beside the electrode center
X design offset (signal edge → frame edge)	632 µm
Fine finishing	1-pulse (2 µm) steps, 4 reads per point (median), up to 2 verifications
Full calibration points (standard sensor)	X = −5.3, −9.9 mm, Y = C2, C4

Tilt coefficients (defaults for the standard sensor)¶

Coefficient	Value
dZ/dX	−0.02 µm/mm
dZ/dY	+3.79 µm/mm
dY/dX	+7.67 µm/mm

Auto scan¶

Item	Default
Fast axis Y	+750 → −2250 µm, 10 µm steps
Slow axis X	−632 → −9999 µm, 500 µm steps
Position step for 1D + TUNE	50 µm (set automatically when the mode is selected)
TUNE sweep	50 → 90 %, 5 % steps
Sequence	2000 segments/point
Settle / Timeout	0.5 s / 60 s
Z tracking	Coefficients (focus at origin)
Rot. tracking (Y)	ON
Snake (bidirectional)	ON (2D)
prefix	`scan`
Laser ON at start / Laser OFF at end	OFF / ON

Network and connections¶

Device	Address
Control PC, oscilloscope, stage, NAS	LAN. IP addresses and user names: Internal information (password protected)
Oscilloscope	VICP
Laser PiLAS DX	COM5 (19200 baud, 8N1, CR terminated)
Camera	Device index 0