DM44: Difference between revisions

Latest revision as of 08:01, 12 October 2023

Tektronix DM44

DMM top for 464/465/466/475

Compatible with 464

Produced from 1975 to (?)

Manuals

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

(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

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

@@ Line 22: / Line 22: @@
 {{BeginSpecs}}
-{{Spec | DC V Range  | 200 mV to 1.2 kV in 5 decade steps }}
+{{Spec | DC V Range            | 200 mV to 1.2 kV in 5 decade steps }}
-{{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 1000MΩ on 200mV and 2V Ranges}}
+{{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 | Max. Input |  ±1200 V (DC + peak AC) between positive input and Common input/chassis, ±500 V (DC + peak AC) to Chassis }}
+{{Spec | Max. Input            | ±1200 V (DC + peak AC) between positive input and Common input/chassis, ±500 V (DC + peak AC) to Chassis }}
-{{Spec | Resistance Range | 200 Ω to 20 MΩ in 6 decade steps }}
+{{Spec | Resistance Range      | 200 Ω to 20 MΩ in 6 decade steps }}
-{{Spec | Resistance Accuracy | 200 Ω to 2 MΩ, 0.25%, ±1 count; 20 MΩ, 0.30%, ±1 count }}
+{{Spec | Resistance Accuracy   | 200 Ω to 2 MΩ, 0.25%, ±1 count; 20 MΩ, 0.30%, ±1 count }}
-{{Spec | Temperature Range (with HP6430 Probe) |−55 °C to +150 °C }}
+{{Spec | Temperature Range     | −55 °C to +150 °C (with [[P6430]] Probe) }}
 {{EndSpecs}}
@@ Line 34: / Line 34: @@
 * [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]
 * [https://www.youtube.com/watch?v=WPgkVThknYo Tek 475A / DM44 repair] by vintageTek Museum @ YouTube
+{{Documents|Link=DM44}}
 ==Pictures==