DM44
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The Tektronix DM44 is a 3½-digit digital multimeter module with manual range switching and LED readout that attaches to the top of the 464, 465, 466, and 475. It replaced the DM40 and DM43.
Key Specifications
| DC V Range | 200 mV to 1.2 kV in 5 decade steps |
|---|---|
| DC V Accuracy | 0.1% of reading, ±1 Count |
| DC V Input Resistance | 10 MΩ, Removable internal wire strap to increase input resistance to 1000 MΩ on 200 mV and 2 V Ranges |
| Max. Input | ±1200 V (DC + peak AC) between positive input and Common input/chassis, ±500 V (DC + peak AC) to Chassis |
| Resistance Range | 200 Ω to 20 MΩ in 6 decade steps |
| Resistance Accuracy | 200 Ω to 2 MΩ, 0.25%, ±1 count; 20 MΩ, 0.30%, ±1 count |
| Temperature Range | −55 °C to +150 °C (with P6430 Probe) |
Links
- Lazy Electrons Tektronix 475A & DM44 Repair Page
- Tek 475A / DM44 repair by vintageTek Museum @ YouTube
Pictures
475 with DM44
466 with DM44
Inputs (side panel)
DM44 Board Top View - Installed in a 475A
DM44 PCB/Module Side view
DM44 PCB/Module Front view
DM44 PCB/Module Top view
DM44 PCB/Module PCB Trace side
DM44 Install - Cutout in 475A Case
DM44 installed in a 475
DM44 Connectors to detach for removal from 475
Underside of DM44
