DM504A: Difference between revisions
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. | 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 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 04:54, 18 November 2023
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
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 an ICL8069 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
-
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 |