DM44
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.
- DM44 Description (PDF)
- Tektronix 465 and DM44 Operators Instruction Manual
- Tektronix DM44 Manual (PDF)
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 1000MΩ on 200mV and 2V 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 (with HP6430 Probe) | −55 °C to +150 °C |
Links
- Lazy Electrons Tektronix 475A & DM44 Repair Page
- 040-0814-02: Installation of DM44 on 465 B052300 - B251074
- 040-0815-01: Installation of DM44 on 465 B251075 & up
- 040-0944-00: Installation of DM44 on 465B
- 040-0817-01: Installation of DM44 on 475
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
