DM504A: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 26: Line 26:
==Internals==
==Internals==
The DM504A has no rear interface I/O.
The DM504A has no rear interface I/O.
The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and an ICL8069 reference.  There is a 93C46 EEPROM (cal constants?)
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.  There is a 93C46 EEPROM (cal constants?)


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 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.

Revision as of 03:57, 18 November 2023

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 circuit is based on an 80C31 microcontroller with a Texas Instruments TL500C integrating A/D front-end and a 1N827 temperature-compensated zener reference. There is a 93C46 EEPROM (cal constants?)

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.

Pictures

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