Open-source hardware replacement scanner cards for the Keithley 2000 and 2001 Digital Multimeters. Designed by Arwid Vasilev · PCB Outline by Patrick Baus · V1.0 · March 2026
Drop-in replacement PCBs for the Keithley 2000-SCAN and 2001-SCAN scanner cards. They plug directly into the existing card slot using the original card-edge connector and provide the same 10-channel switching matrix using modern relays and shift-register control logic.
Four variants are available covering different relay types, instruments, and connector styles.
| Property | Value |
|---|---|
| Target Instrument | Keithley 2000 |
| Relay | Omron CA6V-2-D5V / G6BK-2-D2V |
| Output Connector | 2x 12-position screw terminals (5.08 mm) |
| Max Voltage | 200 VDC / 125 VAC |
| Max Current | 1 A |
| Measurement | Voltage & Resistance ONLY |
| Earth Isolation | 350 V peak |
| Property | Value |
|---|---|
| Target Instrument | Keithley 2000 |
| Relay | Panasonic TQ2-L2-5V (magnetic latching, x11) |
| Output Connector | 2x 12-position screw terminals (5.08 mm) |
| Max Voltage | 125 VDC / 125 VAC |
| Max Current | 1 A |
| Measurement | Voltage & Resistance ONLY |
| Earth Isolation | 220 V max |
Uses Panasonic magnetic latching relays - hold state without continuous coil current, reducing power and heat.
| Property | Value |
|---|---|
| Target Instrument | Keithley 2000 |
| Relay | Panasonic TQ2-L2-5V (magnetic latching, x11) |
| Output Connector | DB25 female + 3-pin screw terminal (OUT B) |
| Max Voltage | 90 VDC (PCB/connector limited) |
| Measurement | Voltage & Resistance ONLY |
| Special Use | Test fixture / DUT wiring via DB25 cable |
All 10 channel H/L lines routed to a DB-25 female connector for use with custom test fixtures.
| Property | Value |
|---|---|
| Target Instrument | Keithley 2001 |
| Relay | Omron G6SK-2-DC5V (x9 relay) + solid-state (x2) |
| Output Connector | 2x 12-position screw terminals (5.08 mm) |
| CH 1-4, CH 6-9 Max Voltage | 110 VDC / 125 VAC rms / 1 A (relay input) |
| CH 5 + CH 10 Max Current | 50 mA (solid-state input) |
| Earth Isolation | 350 V peak |
| Extra Protection | GDT transient suppressors on solid-state channels |
| Part | Description |
|---|---|
| TPIC6B595DWR (x3) | 8-bit power shift register, SOIC-20, drives relay coils directly |
| TPS3808G01DBVR | Voltage supervisor, clears relay state on power loss |
| 3511232BFRS0BNA1 | Keithley card-slot edge connector |
| TQ2-L2-5V | Panasonic 5V magnetic latching relay (Panasonic variants) |
| G6SK-2-DC5V | Omron 5V signal relay (2001 variant) |
| SMD2921-300N | GDT transient suppressor, 300V (2001 variant) |
Each folder contains:
Gerber_*.zip- PCB fabrication files, upload directly to JLCPCB / PCBWayBOM_*.xlsx- Bill of materials with LCSC part numbers for JLCPCB SMT assemblyPickAndPlace_*.xlsx- Pick and place centroid file for SMT assemblySCH_*.pdf- Schematic*.epro- EasyEDA Pro project file
Note: Through-hole relays and the card-edge connector (CN1) require hand soldering.
WARNING: Omron variants - MAX 200 VDC / 125 VAC / 1 A - 350 V PEAK TO EARTH MAXIMUM Panasonic variants - MAX 125 VDC / 125 VAC / 1 A - 220 V TO EARTH MAXIMUM DB25 variant - MAX 90 VDC - VOLTAGE & RESISTANCE ONLY 2001 Omron solid-state channels (CH5, CH10) - MAX 50 mA
- Power off the Keithley completely before inserting or removing the card.
- Select the correct variant for your instrument (2000 vs. 2001).
- Voltage and resistance measurement only - not rated for current switching through the matrix.
| Circuit & PCB Design | Arwid Vasilev - github.com/arwidcool |
| PCB Outline | Patrick Baus |
| EDA Tool | EasyEDA Pro |
Version 1.0 - March 2026