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Keithley 199 Digital board

asanza·keithley_199·hw.kicad/KeithleyUpgrade.kicad_pcb

Keithley 199 Digital board layout, top view — open source PIC board by asanza

About the Keithley 199 Digital board

Keithley 199 Digital board is an open source PIC PCB design by asanza, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 85 × 60 mm, with 74 components from 38 distinct parts.

Its main chip is the PIC32MX350F128L, from the PIC family. Other key parts include the 24AA256, FT230x, MIC2981, LM2936 and TMP275. By type, the board carries 24 resistors, 22 capacitors, 8 ICs, 7 diodes, 5 connectors and 1 transistor.

It belongs with the test & measurement and displays & leds designs in this gallery.

From the project

Upgrades for an old Keithley 199 multimeter

This is an upgrade replacement for the digital control board on Keithley 199 multimeters.

The Keithley 199 is a digital multimeter built in the nineties. It is capable of current, voltage and resistance measurements and also provides a gpib interface for remote control.

These multimeters contains three electronic circuit boards, one which contains the analog circuitry, including analog signal conditioning and analog digital converter, a display board which contains the user interface, and a digital control board, with a processor who controls display, gpib interface and analog digital…

Keithley 199 Digital board, from the project README
From the project README

Main components on the Keithley 199 Digital board

24AA256FT230xPIC32MX350F128LMIC2981LM2936TMP2754050

Keithley 199 Digital board bill of materials (BOM)

74 components, 38 distinct parts.

QtyPartRefs
1
24AA256
U1
1
FT230x
U2
1
PIC32MX350F128L
U3
2
MIC2981
U4, U5
1
LM2936
U6
1
TMP275
U7
1
4050
U8
1
BC850
Q1
1
CRYSTAL_SMD_4POL
X1
1
DEBUG_PORT
J1
1
DISPLAY_BOARD
J14
2
TP1
P8, P9
1
CONN_8
P18
1
USB
JP1
1
TRIGGER
K1
2
82
RP1, RP2
1
CONT
SP1
4
DIODE
D1, D2, D3, D4
3
LED
D5, D6, D7
1
INDUCTOR_SMALL
L1
Show 18 more
QtyPartRefs
2
47p
C1, C2
9
100n
C3, C4, C10, C12, C14, C15, C16, C18 +1
1
4u7
C5
2
18p
C6, C7
1
10u
C8
3
10n
C9, C19, C21
2
220u/10v
C11, C22
2
10u
C13, C17
2
4K7
R1, R8
2
27
R2, R3
1
10K
R4
2
1k75
R5, R6
1
220
R7
8
10k
R9, R10, R12, R14, R15, R16, R17, R23
2
100
R11, R13
1
R
R18
1
4K7
R19
4
220
R20, R21, R22, R24

Keithley 199 Digital board design files

The KiCad project lives in the asanza/keithley_199 repository on GitHub; these links point at the commit this page was built from.

Keithley 199 Digital board: common questions

What microcontroller does the Keithley 199 Digital board use?

The Keithley 199 Digital board is built around the PIC32MX350F128L, from the PIC family.

How big is the Keithley 199 Digital board?

The Keithley 199 Digital board measures 85 × 60 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Keithley 199 Digital board?

74 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keithley 199 Digital board design files?

From the asanza/keithley_199 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Keithley 199 Digital board design in my own project?

Yes, under the terms of its GPL-3.0 license, which asanza chose for the repository.

Can I test firmware for the Keithley 199 Digital board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug PIC firmware against it before you order a PCB.

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