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The '''Tektronix DM44''' is a digital multimeter module that attaches to the top of the
{{Plugin Sidebar
[[464]], [[465]], [[466]], and [[475]]. It replaced the [[DM40]] and [[DM43]]. It is a 3½ Digit Multimeter.
|manufacturer=Tektronix  
|series=464
|type=DM44
|summary=DMM top for [[464]]/[[465]]/[[466]]/[[475]]
|image=Tek 475 with dm44.jpg
|caption=DM44 on top of a [[475]] scope
|introduced=1975
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-2036-00.pdf|Tektronix DM44 Manual]]
* [[Media:070-2038-00.pdf|Tektronix 465 and DM44 Operators Manual]]
* [https://w140.com/tek_dm44_description.pdf DM44 Description]


* [http://w140.com/tek_dm44_description.pdf DM44 Description (PDF)]
* [https://hakanh.com/dl/docs/kitinstructions/040-0814-02.pdf 040-0814-02]: Installation of DM44 on [[465]] B052300 - B251074
* [[Media:Tektronix_070-2038-00_465_Oscilloscope_and_DM44_Digital_Multimeter_Operators_Instruction_Manual_First_Printing_July_1976.pdf | Tektronix 465 and DM44 Operators Instruction Manual]]
* [https://hakanh.com/dl/docs/kitinstructions/040-0815-01.pdf 040-0815-01]: Installation of DM44 on [[465]] B251075 & up
* [[Media:DM44 070-2036-00.pdf|Tektronix DM44 Manual (PDF)]]
* [https://hakanh.com/dl/docs/kitinstructions/040-0944-00.pdf 040-0944-00]: Installation of DM44 on [[465B]]
* [https://hakanh.com/dl/docs/kitinstructions/040-0817-01.pdf 040-0817-01]: Installation of DM44 on [[475]]
}}
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]].


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | DC V Range | 0 to 1.2kV in 5 Steps }}
{{Spec | DC V Range           | 200 mV to 1.2 kV in 5 decade steps }}
{{Spec | DC V Resolution  | 100μV }}
{{Spec | DC V Accuracy         | 0.1% of reading, ±1 Count }}
{{Spec | DC V Accuracy   | 0.1% of reading, ±1 Count }}
{{Spec | DC V Input Resistance | 10 MΩ, Removable internal wire strap to increase input resistance to 1000 MΩ on 200 mV and 2 V Ranges}}
{{Spec | DC V Input Resistance | 10MΩ, Removable internal wire strap to increase input resistance to 1000MΩ on 200mV and 2V Ranges}}
{{Spec | Max. Input           | ±1200 V (DC + peak AC) between positive input and Common input/chassis, ±500 V (DC + peak AC) to Chassis }}   
{{Spec | DC V Maximum Input Voltages, All Ranges | ±1200V (DC + Peak AC) Between  Positive input and Common input/Chassis }}
{{Spec | Resistance Range     | 200 Ω to 20 MΩ in 6 decade steps }}
{{Spec | DC V Maximum Floating Voltage on COMMON |  ±500V (DC + Peak AC) to Chassis }}   
{{Spec | Resistance Accuracy   | 200 Ω to 2 MΩ, 0.25%, ±1 count; 20 MΩ, 0.30%, ±1 count }}
{{Spec | Resistance Range | 0 to 20MΩ in 6 Ranges }}
{{Spec | Temperature Range     | −55 °C to +150 °C (with [[P6430]] Probe) }}
{{Spec | Resistance Resolution | 0.1Ω }}
{{Spec | Resistance Accuracy 200Ω and 2kΩ Range | within 0.25%, ±1 count + Probe Resistance }}
{{Spec | Resistance Accuracy 20kΩ,200kΩ and 2MΩ Ranges | within 0.25%, ±1 count }}
{{Spec | Resistance Accuracy 20MΩ Range | within 0.30%, ±1 count }}
{{Spec | Resistance Response Time 200Ω and 200kΩ Range | Within 1 Second }}
{{Spec | Resistance Response Time 2MΩ and 20MΩ Range | Within 5 Seconds }}
{{Spec | Temperature Range (with HP6430Probe) |-55 °C to +150 °C }}
{{EndSpecs}}
{{EndSpecs}}


==Links==
==Links==
* [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]  
* [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]  
* [http://hakanh.com/dl/docs/kitinstructions/040-0814-02.pdf 040-0814-02]: Installation of DM44 on [[465]] B052300 - B251074
* [https://www.youtube.com/watch?v=WPgkVThknYo Tek 475A / DM44 repair] by vintageTek Museum @ YouTube
* [http://hakanh.com/dl/docs/kitinstructions/040-0815-01.pdf 040-0815-01]: Installation of DM44 on [[465]] B251075 & up
{{Documents|Link=DM44}}
* [http://hakanh.com/dl/docs/kitinstructions/040-0944-00.pdf 040-0944-00]: Installation of DM44 on [[465B]]
* [http://hakanh.com/dl/docs/kitinstructions/040-0817-01.pdf 040-0817-01]: Installation of DM44 on [[475]]


==Pictures==
==Pictures==
Line 44: Line 49:
DM44-Circuit01.jpg | DM44 installed in a 475
DM44-Circuit01.jpg | DM44 installed in a 475
DM44-Removal01.jpg | DM44 Connectors to detach for removal from 475
DM44-Removal01.jpg | DM44 Connectors to detach for removal from 475
DM44-Underside.jpg | Underside of DM44
</gallery>
</gallery>


[[Category:Digital multimeters]]
[[Category:Digital multimeters]]
[[Category:Specifications needed]]
[[Category:Specifications needed]]
[[Category:Introduced in 1975]]

Latest revision as of 07:01, 12 October 2023

Tektronix DM44
DMM top for 464/465/466/475
DM44 on top of a 475 scope

Compatible with 464

Produced from 1975 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
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

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

    475 with DM44

  • 466 with DM44

    466 with DM44

  • Inputs (side panel)

    Inputs (side panel)

  • DM44 Board Top View - Installed in a 475A

    DM44 Board Top View - Installed in a 475A

  • DM44 PCB/Module Side view

    DM44 PCB/Module Side view

  • DM44 PCB/Module Front view

    DM44 PCB/Module Front view

  • DM44 PCB/Module Top view

    DM44 PCB/Module Top view

  • DM44 PCB/Module PCB Trace side

    DM44 PCB/Module PCB Trace side

  • DM44 Install - Cutout in 475A Case

    DM44 Install - Cutout in 475A Case

  • DM44 installed in a 475

    DM44 installed in a 475

  • DM44 Connectors to detach for removal from 475

    DM44 Connectors to detach for removal from 475

  • Underside of DM44

    Underside of DM44

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