LCR calibration & reference board

This is a board to test the capabilities of LCR meters, like my DER-EE DE-5000 LCR-meter.

3D model (KiCad)

Components

Capacitors:

  • 10 pF, 100 pF, 1 nF, 10 nF MLCC in 0603 size with 1% tolerance and C0G dielectric
  • 100 nF, 1 uF MLCC in 0603 size with 10% tolerance and X7R dielectric (50VDC rating to minimize DC bias effect)
  • 1000 uF electrolytic capacitor, 20% tolerance
  • 100 uF tantalum polymer capacitor, also 20% tolerance

Resistors:

  • 10R, 100R, 1k, 10k, 100k, 1M in 0603 size with 0.1% tolerance and 25ppm/°C

Inductor:

  • 10 uH inductor in 0805 size with 2% tolerance

Diodes:

  • One standard diode and a red, green and blue LED in 0603 size (bottom right)

Calibration can be performed with the short and open contacts. Open calibration is useful when measuring capacitors, short calibration is useful when measuring resistors.

Slots between the capacitors help to reduce parasitic capacitance because the \epsilon_r of air is factor 4-5 lower than the \epsilon_r of FR4.

Measurements with DER-EE DE-5000 LCR-meter

Capacitor values100 Hz1 kHz10 kHz100 kHz
10 pF510,9 10,911,06
100 pF101101,4 101,44101,45
1000 pF (1 nF)10031006,5 1005,91006,2
10 nF10,11910,113 10,11210,109
100 nF102,95101,61 100,3897,42
1000 nF1044,4973,9 842,7801,8
100 uF (tantal)101,1698,37 96,5O.L
1000 uF (electrolytic)1015.3896O.LO.L
Values at different measurement frequencies. Each row has the same unit, which is given in the very left cell. O.L means over limit, capacitive reactance is too low. That does not matter since in practice 1000 uF electrolytic capacitors won’t be operated at 100 kHz.

There is also a 120Hz setting for the measuring frequency which I skipped. Why is there a 100Hz/120Hz setting? The frequency on the output side of a full-wave bridge rectifier (where the big chonky electrolytic capacitors are placed) is double the frequency value on the input side. Well the EU has a 50Hz AC grid, the USA has a 60Hz grid, therefore the 100Hz/120Hz option.


Resistor values in Ohmfmeas = 10 kHz
109,957
10099,87
1k0,9995
10k9,996
100k99,92
1M0,9982
Values at different measurement frequencies. Each row has the same unit, which is given in the very left cell.

Inductor value100 Hz1 kHz10 kHz100 kHz
10 uH1310,611,1711,096
Values at different measurement frequencies. Each row has the same unit, which is given in the very left cell.

The forward voltage measurements were carried out with a Voltcraft VC265 multimeter. According to the manual, the maximum applied voltage in the diode test function is 1.48V. The red LED lights up very weakly, the green and blue one obviously stay dark.

DeviceMeasured forward voltage in V
Standard diode0,561
LED red
LED green
LED blue

Part numbers of components used

CapacitorsManufacturer part number
10 pFGCM1885C2A100FA16J
100 pFGCM1885C2A101FA16D
1 nFGCM1885C2A102FA16D
10 nFGRM1885C1H103JA01J
100 nFUMK107AB7105KA-T
1 uFUMK107AB7105KA-T
100 uF TantalTCJB107M006R0055
1000 uF ElectrolyticECA-1CM102B

ResistorsManufacturer part number
10CRT0603-BY-10R0ELF
100RT0603BRD07100RL
1kRT0603BRD131KL
10kRT0603BRD1010KL
100kRT0603BRD07100KL
1MRT0603BRD071ML

Inductor Manufacturer part number
10 uHAISC-0805F-100G-T

DiodesManufacturer part number
General Purpose DiodeBAV16W_R1_00001
LED red150060RS75000
LED green150060GS75000
LED blue150060BS75000

More pictures

Fixate the PCB on the table, so it does not move while working with the stencil
Applying solder paste with stencil
Components placed
Soldering the PCB
How to quickly get somewhat decent pictures: Open up text editor, turn screen brightness to 100% and put a sheet of paper on the keyboard. Voilà.