DM504A: Difference between revisions

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-{{TM500 | mfg=Tektronix | type=DM504 | function=autoranging digital multimeter | class=multimeter | image=Tek dm504a.jpg | introduced=(?) | discontinued=(?) |
+{{TM500 | mfg=Tektronix | type=DM504A | function=4½ digit autoranging digital multimeter | class=multimeter | image=Tek dm504a.jpg | introduced=1989 | discontinued=(?) | an=an |
-designers= |manuals=[http://w140.com/DM-504A_Instruction-Oct_88-Service_Manual-Sept_88-OCR.pdf Tektronix DM-504A Manual (PDF)]
+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:160-5426-00.bin|160-5426-00]] (27C64) ''please add''
 }}
-The '''DM504A''' was introduced in 1989.
+{{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 Vin > 12 V) }}
-==Specifications==
+{{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%;  }}
-* 4-1/2 Digit Autoranging DMM
+{{Spec | AC current    | 200 μA to 2 A in decade steps, ±0.6%;  }}
-* True RMS AC Functions
+{{Spec | Resistance    | 200 Ω to 20  MΩ in decade steps, 0.05% (0.1% in 2 and 20 MΩ ranges }}
-* Modes: DC Volts, AC Volts, DC mA, AC mA, Ohms, and Temperature
+{{Spec | Temperature   | −62 °C to +230°C with [[P6602]] 2-wire PT-100 probe }}
-* 0.07% DC Voltage Accuracy
+{{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
+}}
+{{EndSpecs}}
 ==Links==
 * [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==
 <gallery>
-File:Tek dm504a.jpg | DM504A
+Tek dm504a.jpg | DM504A
 Tek dm504a 34.jpg|DM504A
-File:Tek-DM-504A-LH_Interor-With_Shield.jpg | DM504A LH Interior with HV shield in place
+Tek-DM-504A-LH_Interor-With_Shield.jpg | DM504A LH Interior with HV shield in place
-File:Tek-DM-504A-RH_Interor-With_Shield.jpg | DM504A RH Interior with HV shield in place
+Tek-DM-504A-RH_Interor-With_Shield.jpg | DM504A RH Interior with HV shield in place
-File:Tek-DM-504A-LH_Interor-No_Shield.jpg | DM504A LH Interior with HV shield removed
+Tek-DM-504A-LH_Interor-No_Shield.jpg | DM504A LH Interior with HV shield removed
-File: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>
+==Components==
+{{Parts|DM504A}}