DM504A: Difference between revisions
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{{TM500 | mfg=Tektronix | type= | {{TM500 | mfg=Tektronix | type=DM504A | function=4½ digit autoranging digital multimeter | class=multimeter | image=Tek dm504a.jpg | introduced=1989 | discontinued=(?) | an=an | | ||
manuals=[ | designers= | ||
|manuals= | |||
* [[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'' | |||
}} | }} | ||
{{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) }} | |||
{{Spec | AC Voltage | 200 mV to 500 V in decade steps, ±0.6%; Input resistance 10 MΩ // 100 pF }} | |||
{{Spec | DC current | 200 μA to 2 A in decade steps, ±0.1% }} | |||
{{Spec | AC current | 200 μA to 2 A in decade steps, ±0.6% }} | |||
* Modes: DC Volts, AC Volts | {{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== | ||
<gallery> | <gallery> | ||
Tek dm504a.jpg | DM504A | |||
Tek dm504a 34.jpg|DM504A | |||
Tek-DM-504A-LH_Interor-With_Shield.jpg | DM504A LH Interior with HV shield in place | |||
Tek-DM-504A-RH_Interor-With_Shield.jpg | DM504A RH Interior with HV shield in place | |||
Tek-DM-504A-LH_Interor-No_Shield.jpg | DM504A LH 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 05:06, 1 August 2024
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 |
|
Links
- DM504A @ barrytech.com
- DM504A repair by VintageTEK Museum @ YouTube
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 LH Interior with HV shield in place
-
DM504A RH Interior with HV shield in place
-
DM504A LH 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 | 571 • DM504A • DM511 • DM5110 |