Metrology

• Metrology

  Everything metrology & Calibration related. This is where the Voltnuts hang out.

• Sticky Topics

• [INDEX] Metrology section quick guide

  Started by TiN on 14 Dec, 2016 04:47
  Last post by KungFuJosh on 29 Dec, 2025 16:25

  Views: 161956, Replies: 13

• Topics

• K2001 ADC

  Started by GigaJoe on 17 Sep, 2025 17:09
  Last post by GigaJoe on 22 Jun, 2026 02:47

  Views: 10820, Replies: 109

• Experimental HP 3458A CAL-RAM backup, decoder and GPIB read/write tool

  Started by kvez on 21 Jun, 2026 00:03
  Last post by TERRA Operative on 21 Jun, 2026 23:22

  Views: 396, Replies: 8

• "NU180" - A U180 drop-in replacement for the 3458A.

  Started by Zondar on 20 Aug, 2025 21:02
  Last post by Zondar on 21 Jun, 2026 16:01

  Views: 88200, Replies: 905

• Claude designs a 1 ohm standard resistor, how would you do it?

  Started by aronake on 21 Jun, 2026 06:13
  Last post by aronake on 21 Jun, 2026 13:43

  Views: 376, Replies: 5

• Analog frontends for DMMs approaching 8.5 digits - Discussions

  Started by Echo88 on 17 Sep, 2022 23:26
  Last post by Kleinstein on 21 Jun, 2026 08:11

  Views: 173294, Replies: 433

• Symmetricom S200 Teardown/upgrade to S250

  Started by SoundTech-LG on 05 Oct, 2017 14:52
  Last post by Astralix on 20 Jun, 2026 21:21

  Views: 104633, Replies: 210

• 1PPS errors with 33250A and 33622A arbs

  Started by openloop on 14 Jun, 2026 13:53
  Last post by Renate on 20 Jun, 2026 17:54

  Views: 451, Replies: 7

• Ultra Precision Reference LTZ1000

  Started by quarks on 12 Jan, 2013 16:42
  Last post by iMo on 20 Jun, 2026 15:30

  Views: 1888781, Replies: 3489

• Low Thermal E.M.F. Binding Post TBP3

  Started by branadic on 29 Dec, 2022 21:25
  Last post by aronake on 20 Jun, 2026 15:28

  Views: 43304, Replies: 109

• HP 34401A hacks and upgrades

  Started by cellularmitosis on 26 Apr, 2018 00:48
  Last post by Kleinstein on 19 Jun, 2026 21:06

  Views: 47015, Replies: 243

• Controlling HP S-parameters test set(8513/14/15/16/17) with custom FW

  Started by klondike on 15 Jun, 2026 02:39
  Last post by rplabs on 19 Jun, 2026 11:45

  Views: 219, Replies: 2

• AD587LW - 10V precision travel standard

  Started by Andreas on 11 Mar, 2018 21:01
  Last post by Andreas on 18 Jun, 2026 13:56

  Views: 71178, Replies: 171

• A Low-Cost 20-bit Precision Voltage Source: 10µV Steps with a 16-bit DAC

  Started by BD1QMP on 15 Apr, 2026 14:08
  Last post by laosiji141 on 18 Jun, 2026 13:28

  Views: 2910, Replies: 27

• WinGPIB - Windows GPIB App (multi-purpose)

  Started by IanJ on 18 Nov, 2018 21:02
  Last post by IanJ on 18 Jun, 2026 12:27

  Views: 372105, Replies: 1093

• Sound Meter Calibrators

  Started by mendip_discovery on 25 Jul, 2021 16:04
  Last post by Henrik_V on 18 Jun, 2026 07:00

  Views: 5372, Replies: 13

• Teardown: Standard Resistors

  Started by zlymex on 10 Mar, 2016 03:11
  Last post by trobbins on 17 Jun, 2026 23:50

  Views: 248101, Replies: 345

• How does resistor drift ppm/C and johnson noise affect circuit noise?

  Started by ballsystemlord on 14 Jun, 2026 03:47
  Last post by TimFox on 17 Jun, 2026 14:39

  Views: 812, Replies: 24

• HP 3458A repair - Convergence error with wierd workaround

  Started by IanJ on 16 Jun, 2026 17:52
  Last post by Kleinstein on 17 Jun, 2026 11:10

  Views: 304, Replies: 8

• Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x

  Started by zlymex on 28 Sep, 2016 11:39
  Last post by analityk on 17 Jun, 2026 06:53

  Views: 341958, Replies: 705

• HP 3458A — non-converging rundown, single-slope only: is this faulty U180?

  Started by vf33184 on 11 Jun, 2026 22:49
  Last post by Kleinstein on 17 Jun, 2026 04:06

  Views: 1006, Replies: 19

• Advice on building a Coaxial Current Shunt

  Started by hazzer on 05 Apr, 2026 08:43
  Last post by tszaboo on 15 Jun, 2026 10:26

  Views: 1944, Replies: 23

• HP3458A data acquisition sw

  Started by Timeok on 10 Jun, 2026 12:39
  Last post by IanJ on 15 Jun, 2026 09:40

  Views: 584, Replies: 6

• DC Source Calibrator using inductive voltage divider?

  Started by Birb on 03 May, 2026 15:32
  Last post by Kleinstein on 15 Jun, 2026 07:26

  Views: 2201, Replies: 13

• DMM7510 Coax transformer

  Started by Echo88 on 05 Nov, 2021 12:31
  Last post by xmjacky on 13 Jun, 2026 13:28

  Views: 10063, Replies: 23

• Advantest R6581 Schematic Diagrams

  Started by Mickle T. on 08 Apr, 2018 20:07
  Last post by Aipham on 13 Jun, 2026 06:50

  Views: 12577, Replies: 47

• Chinese Metrology accessories list

  Started by PascalNE on 15 May, 2025 22:04
  Last post by PascalNE on 12 Jun, 2026 15:22

  Views: 26351, Replies: 159

• LM399 based 10 V reference

  Started by fmaimon on 14 Apr, 2013 20:21
  Last post by GigaJoe on 12 Jun, 2026 14:34

  Views: 901744, Replies: 1508

• L&N K4 7554 potentiometer & L&N K5 7555 potentiometer manuals

  Started by trobbins on 05 Jun, 2026 11:02
  Last post by Vgkid on 10 Jun, 2026 17:25

  Views: 710, Replies: 3

• Noise source for noise figure measurements

  Started by Timeok on 27 Jul, 2023 12:31
  Last post by Timeok on 10 Jun, 2026 12:19

  Views: 9649, Replies: 25

• Dual atomic clock experiment

  Started by iMo on 25 Apr, 2025 06:30
  Last post by grx on 09 Jun, 2026 20:31

  Views: 8521, Replies: 44

• Group buy - low thermal EMF LEMO connector for nanovoltmeter (34420/2182)

  Started by balage on 05 Sep, 2019 18:30
  Last post by aronake on 09 Jun, 2026 12:20

  Views: 11194, Replies: 35

• ADR1399 reference

  Started by branadic on 11 Apr, 2022 09:33
  Last post by Andreas on 08 Jun, 2026 18:36

  Views: 248870, Replies: 423

• Keithley 2461 digitizer trigger model

  Started by owiecc on 08 Jun, 2026 09:06
  Last post by owiecc on 08 Jun, 2026 12:36

  Views: 441, Replies: 1

• ADR1001 - Ovenized Voltage Reference System

  Started by iMo on 23 Sep, 2022 09:57
  Last post by iMo on 07 Jun, 2026 18:56

  Views: 262122, Replies: 522

• Tinsley SLIDEWIRE #4264 info?

  Started by NANOJOLTS on 04 Jun, 2026 17:31
  Last post by Gyro on 05 Jun, 2026 19:28

  Views: 786, Replies: 6

• 3458 Dallas chip replcement

  Started by Louis_C on 05 Jun, 2026 00:37
  Last post by laichh on 05 Jun, 2026 08:06

  Views: 738, Replies: 3

• Sampling with 3458A Book (UK group Buy??)

  Started by mendip_discovery on 04 Jun, 2026 18:22

  Views: 693, Replies: 0

• Joulescope an interesting device

  Started by Overspeed on 02 Jun, 2026 09:43
  Last post by Psi on 03 Jun, 2026 10:29

  Views: 1050, Replies: 5

• Seeking NMI-Grade & Boutique Metrology Equipment Suppliers

  Started by marcus.viegas on 01 Jun, 2026 17:30
  Last post by CalibrationGuy on 02 Jun, 2026 14:30

  Views: 930, Replies: 3