DM44

The Tektronix DM44 is a digital multimeter module that attaches to the top of the 464, 465, 466, and 475. It replaced the DM40 and DM43. It is a 3½ Digit Multimeter.

• DM44 Description (PDF)
• Tektronix 465 and DM44 Operators Instruction Manual
• Tektronix DM44 Manual (PDF)

Key Specifications

DC V Range	0 to 1.2kV in 5 Steps
DC V Resolution	100μV
DC V Accuracy	0.1% of reading, ±1 Count
DC V Input Resistance	10MΩ, Removable internal wire strap to increase input resistance to 1000MΩ on 200mV and 2V Ranges
DC V Maximum Input Voltages, All Ranges	±1200V (DC + Peak AC) Between Positive input and Common input/Chassis
DC V Maximum Floating Voltage on COMMON	±500V (DC + Peak AC) to Chassis
Resistance Range	0 to 20MΩ in 6 Ranges
Resistance Resolution	0.1Ω
Resistance Accuracy 200Ω and 2kΩ Range	within 0.25%, ±1 count + Probe Resistance
Resistance Accuracy 20kΩ,200kΩ and 2MΩ Ranges	within 0.25%, ±1 count
Resistance Accuracy 20MΩ Range	within 0.30%, ±1 count
Resistance Response Time 200Ω and 200kΩ Range	Within 1 Second
Resistance Response Time 2MΩ and 20MΩ Range	Within 5 Seconds
Temperature Range (with HP6430Probe)	-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

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  475 with DM44

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  466 with DM44

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  Inputs (side panel)

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  DM44 Board Top View - Installed in a 475A

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  DM44 PCB/Module Side view

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  DM44 PCB/Module Front view

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  DM44 PCB/Module Top view

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  DM44 PCB/Module PCB Trace side

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  DM44 Install - Cutout in 475A Case

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  DM44 installed in a 475