DM504A: Difference between revisions

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{{TM500 | mfg=Tektronix | type=DM504A | function=autoranging digital multimeter | class=multimeter | image=Tek dm504a.jpg | introduced=1989 | discontinued=(?) | an=an |
{{TM500 | mfg=Tektronix | type=DM504A | function=4½ digit autoranging digital multimeter | class=multimeter | image=Tek dm504a.jpg | introduced=1989 | discontinued=(?) | an=an |
designers=  
designers=  
|manuals=
|manuals=
* [[Media:070-6945-00.pdf|Tektronix DM504A Manual]]
* [[Media:070-6945-00.pdf|DM504A Operator Manual 070-6945-00]]
* [[Media:070-7135-00.pdf|DM504A Service Manual 070-7135-00]]
{{ROM Images}}
* [[Media:160-5426-05.bin|160-5426-05]] / [[Media:160-5426-03.bin|160-5426-03]] / [[Media:160-5426-00.bin|160-5426-00]] (27C64) ''please add''
}}
}}
==Specifications==
{{BeginSpecs}}
 
{{Spec | DC Voltage    | 200 mV to 1000 V in decade steps, ±0.05%; Input resistance 10 MΩ (200 kΩ in 0.2 and 2 V ranges if V<sub>in</sub> >12 V) }}
* 4-1/2 Digit Autoranging DMM
{{Spec | AC Voltage    | 200 mV to 500 V in decade steps, ±0.6%; Input resistance 10 MΩ // 100 pF }}
* True RMS AC Functions
{{Spec | DC current    | 200 μA to 2 A in decade steps, ±0.1% }}
* Modes: DC Volts, AC Volts, DC mA, AC mA, Ohms, and Temperature  
{{Spec | AC current    | 200 μA to 2 A in decade steps, ±0.6% }}
* 0.07% DC Voltage Accuracy
{{Spec | Resistance    | 200 Ω to 20  MΩ in decade steps, 0.05% (0.1% in 2 and 20 MΩ ranges }}
{{Spec | Temperature  | −62 °C to +230°C with [[P6602]] 2-wire PT-100 probe }}
{{Spec | Display      | 4½ digits, red LED, 2/s update rate }}
{{Spec | Features      |
* Modes: DC Volts / mA, AC Volts/ mA (True RMS), Ohms, and Temperature  
* Diode Test and Audible Continuity (Beeper) Modes
* Diode Test and Audible Continuity (Beeper) Modes
}}
{{EndSpecs}}


==Links==
==Links==
* [http://www.barrytech.com/tektronix/tektm500/tekdm504a.html DM504A @ barrytech.com]
* [http://www.barrytech.com/tektronix/tektm500/tekdm504a.html DM504A @ barrytech.com]
* [https://youtube.com/watch?v=b-xhF_-hiqM DM504A repair] by VintageTEK Museum @ YouTube
{{Documents|Link=DM504A}}
==Internals==
The DM504A has no rear interface I/O. The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 V<sub>AC</sub> windings.
The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and a 1N827 temperature-compensated zener reference.  The DM504A is software-calibrated, storing cal constants in a 93C46 EEPROM.  Calibration is triggered by pressing Up and Down buttons simultaneously while the internal cal jumper is in the "enabled" position.


==Pictures==
==Pictures==
Line 24: Line 40:
Tek-DM-504A-RH_Interor-No_Shield.jpg | DM504A RH Interior with HV shield removed
Tek-DM-504A-RH_Interor-No_Shield.jpg | DM504A RH Interior with HV shield removed
</gallery>
</gallery>
==Components==
{{Parts|DM504A}}

Latest revision as of 04:06, 1 August 2024

Tektronix DM504A
4½ digit autoranging digital multimeter
Tektronix DM504A

Produced from 1989 to (?)

Manuals
ROM Images
File Pos. Checksum
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DM504A is an 4½ digit autoranging digital multimeter plug-in for the TM500 system.

Key Specifications

DC Voltage 200 mV to 1000 V in decade steps, ±0.05%; Input resistance 10 MΩ (200 kΩ in 0.2 and 2 V ranges if Vin >12 V)
AC Voltage 200 mV to 500 V in decade steps, ±0.6%; Input resistance 10 MΩ // 100 pF
DC current 200 μA to 2 A in decade steps, ±0.1%
AC current 200 μA to 2 A in decade steps, ±0.6%
Resistance 200 Ω to 20  MΩ in decade steps, 0.05% (0.1% in 2 and 20 MΩ ranges
Temperature −62 °C to +230°C with P6602 2-wire PT-100 probe
Display 4½ digits, red LED, 2/s update rate
Features
  • Modes: DC Volts / mA, AC Volts/ mA (True RMS), Ohms, and Temperature
  • Diode Test and Audible Continuity (Beeper) Modes

Links

Documents Referencing DM504A

(no results)

Internals

The DM504A has no rear interface I/O. The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 VAC windings.

The circuit is based on an 80C31 microcontroller with a Texas Instruments TL500C integrating A/D front-end and a 1N827 temperature-compensated zener reference. The DM504A is software-calibrated, storing cal constants in a 93C46 EEPROM. Calibration is triggered by pressing Up and Down buttons simultaneously while the internal cal jumper is in the "enabled" position.

Pictures

  • DM504A

    DM504A

  • DM504A

    DM504A

  • DM504A LH Interior with HV shield in place

    DM504A LH Interior with HV shield in place

  • DM504A RH Interior with HV shield in place

    DM504A RH Interior with HV shield in place

  • DM504A LH Interior with HV shield removed

    DM504A LH Interior with HV shield removed

  • DM504A RH Interior with HV shield removed

    DM504A RH Interior with HV shield removed

Components

Some Parts Used in the DM504A

Part Part Number(s) Class Description Used in
AD737 156-3506-00 Monolithic integrated circuit RMS/DC converter DM504A
Intel 8031 Monolithic integrated circuit 8-bit microcontroller 11A33 • 571 • DM504A • DM511 • DM5110
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