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Keithley1950

openscopeproject·Keithley1950

Keithley1950 PCB layout, top view — open source board by openscopeproject
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About the Keithley1950 PCB

Keithley1950 is an open source PCB design by openscopeproject, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 60 × 80 mm, with 83 components from 43 distinct parts.

Other key parts include the TLE2072, LM339, 74LS138, AD8436 and ULN2003. By type, the board carries 27 resistors, 24 capacitors, 8 transistors, 7 ICs, 7 relays and 7 diodes.

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

From the project

Keithley 195A DMM Option 1950

Keithley Instruments 195A Digital Multimeter is a 5½ digit resolution 200 000 count instrument that was manufactured in the 80's, possibly early 90's. It was available in two configurations: base model that only had DC Volts and Ohms measurements and model with 1950 option, which added DC/AC Amps and AC TRMS Volts measurements.

Keithley DMM line has long replaced 195/196/199 series with newer models but these still show up on Ebay and other outlets and they offer great performance for reasonable prices. Unfortunately most of the 195A models available online are the ones without 1950 Option.

Keithley1950, from the project README
From the project README

Main components on the Keithley1950

TLE2072LM33974LS138AD8436ULN200374HC4094

Keithley1950 bill of materials (BOM)

83 components, 43 distinct parts.

QtyPartRefs
2
TLE2072
U1, U7
1
LM339
U2
1
74LS138
U3
1
AD8436
U4
1
ULN2003
U5
1
74HC4094
U6
5
MMBFJ111
Q1, Q2, Q3, Q4, Q7
3
MMBT3906
Q5, Q6, Q8
1
Conn_01x14
J1
1
Conn_01x03
J2
1
Conn_01x02
J3
4
Relay_SP2P
K1, K2, K4, K5
3
Relay_SP3P
K3, K6, K7
7
S3M
D1, D2, D3, D4, D5, D6, D7
3
47uF
C1, C2, C3
1
470pF
C4
10
.1uF
C5, C6, C8, C11, C13, C14, C15, C16 +2
1
10uF
C7
1
10uF
C9
1
1uF
C10
Show 23 more
QtyPartRefs
1
3.3uF
C12
1
610pF
C19
1
110pF
C20
2
5pF
C21, C24
1
47pF
C22
1
0.1uF
C23
6
10k
R1, R2, R16, R18, R22, R27
1
470R
R3
5
100k
R4, R7, R8, R11, R28
1
430R
R5
1
47R
R6
1
43R
R9
1
4R7
R10
1
4R3
R12
1
5R1
R13
1
R47
R14
1
R43
R15
1
0R1
R17
1
10M
R19
1
2k
R20
1
27k
R21
1
3k
R24
2
1M
R25, R26

Keithley1950 design files

The KiCad project lives in the openscopeproject/Keithley1950 repository on GitHub; these links point at the commit this page was built from.

Keithley1950: common questions

How big is the Keithley1950 PCB?

The Keithley1950 measures 60 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keithley1950?

83 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keithley1950 design files?

From the openscopeproject/Keithley1950 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Keithley1950 design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which openscopeproject chose for the repository.

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