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-* [http://w140.com/smb/DC504_SM.pdf Tektronix DC504 Manual (OCR, PDF)]
+{{TM500 | mfg=Tektronix | type=DC504 | function=80 MHz, 5-digit frequency counter | class=counter | image=Tek dc504 on.jpg  | introduced=1975 | discontinued=1983 |
-* [http://w140.com/smb/DC504A_SM.pdf Tektronix DC504A Manual (OCR, PDF)]
+designers= |manuals=
+* [[Media:070-1670-01.pdf|DC504 Manual]] (OCR)
+}}
+It was superseded by the [[DC504A]] in 1984.
+{{BeginSpecs}}
+{{Spec|Frequency Range      | DC (AC coupled: 10 Hz) to at least 80 MHz }}
+{{Spec|Sensitivity          | 20 mV<sub>RMS</sub> sine wave below 15 MHz, 35 mV<sub>RMS</sub> to 50 MHz, derated down to 175 mV<sub>RMS</sub> at 80 MHz}}
+{{Spec|Input impedance      | 1 MΩ // 20 pF}}
+{{Spec|Trigger Level Range  | −1.5 V to +1.5 V}}
+{{Spec|Frequency Resolution | kHz ranges: 0.1 Hz; 1 Hz and 10 Hz (7 digit resolution possible in overflow kHz position); MHz ranges: 100 Hz, 1 kHz (9 digit resolution possible in overflow kHz position) }}
+{{Spec|Period resolution    | ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms}}
+{{Spec|Display Time         | Variable  ~0.1 s ... ~10 s and HOLD mode}}
+{{Spec|Standard Time Base   | 1 MHz, ±1×10<sup>-5</sup> from 0°C to +50°C, ±1×10<sup>-5</sup> per month, Adjustable to within 1×10<sup>-7</sup>}}
+{{Spec|Opt. 1 Time Base     | 5 MHz, ±1×10<sup>-7</sup> from 0°C to +50°C, ±1×10<sup>-7</sup> per month, Adjustable to within 1×10<sup>-9</sup>}}
+{{EndSpecs}}
+An internal "RPM" mode switch stretches gate times sixfold, giving a longest gate time of 1 minute with a display scaled in revolutions per minute.
+==Links==
+{{Documents|Link=DC504}}
+==Rear Interface==
+<small>
+{|
+|-
+| 28B − Gate Out, Totalize Start/Stop || 28A − Hold
+|-
+| 27B − Decimal point                 ||
+|-
+|                                     || 26A − /Reset
+|-
+|                                     || 25A − TS1 (digit select 1, MSD)
+|-
+| 24B − Scan clock out                || 24A − TS2 (digit select 2)
+|-
+| 23B − Overflow                      || 23A − TS3 (digit select 3)
+|-
+| 22A − TS4 (digit select 4)          ||
+|-
+| 21B − BCD out 2                     || 21A − TS5 (digit select 5, LSD)
+|-
+| 20B − BCD out 8                     ||  20A − BCD out 4
+|-
+| 19B − Latch Out (Data Good)         ||   19A − BCD out 1
+|-
+|                                     ||  17A – Signal Input GND
+|-
+|                                     ||  16A − Signal input
+|-
+|                                     ||  15A – External Clock GND
+|-
+|                                     ||  14A − External Clock (GND on 15A)
+|}
+</small>
+==Internals==
+The DC504 uses a [[Mostek MK5009]]P PMOS oscillator/counter IC to control gate times.
+The first counter stage is a [[Signetics 82S90]] 85(100) MHz decade counter, followed by four 7490 decade counters, 7475 latches, and 7401s to multiplex the output/display.
+==Pictures==
 <gallery>
-File:Tek dc504a.JPG|DC504A
+Tek dc504 front.jpg|DC504
+Tek dc504 on.jpg |DC504
+Tek dc504 display.jpg|DC504
+Tek dc504 input.jpg|DC504
+Tek dc504 rear1.jpg|DC504
+Tek dc504 rear2.jpg|DC504
+DC504-inside-component-side.jpg|DC504 inside; component side
+DC504-inside-copper-side.jpg|DC504 inside; copper side
 </gallery>
-[[Category:TM500 counter plugins]]
+==Components==
-[[Category:Frequency counters]]
+{{Parts|DC504}}
-[[Category:Description needed]]
-[[Category:Specifications needed]]
-[[Category:Image needed]]