DM44

Manuals – Specifications – Links – Pictures

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

Documents Referencing DM44

Document	Class	Title	Authors	Year	Links
Tekscope 1976 V8 N3.pdf	Article	Taking the Delay out of Delaying Sweep Measurements	Bill Law	1976	DM44

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