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{{TM500 | mfg=Tektronix | type=DC504A | function=100 MHz frequency counter | class=counter | image=DC504A_Front_Panel.jpg | introduced=1975 | discontinued=1993 |
{{TM500 | mfg=Tektronix | type=DC504 | function=80 MHz, 5-digit frequency counter | class=counter | image=Tek dc504 on.jpg | introduced=1975 | discontinued=1983 |
manuals=
designers= |manuals=
* [http://w140.com/smb/DC504_SM.pdf Tektronix DC504 Manual (OCR, PDF)]
* [[Media:070-1670-01.pdf|DC504 Manual]] (OCR)  
* [http://w140.com/smb/DC504A_SM.pdf Tektronix DC504A Manual (OCR, PDF)]
}}
}}
It was superseded by the [[DC504A]] in 1984.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}}


==Specifications==
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.
* 5 Digit LED Display
 
* Frequency Range
==Links==
** DC coupled: 0 Hz to at least 80 MHz
{{Documents|Link=DC504}}
** AC coupled: 10 Hz to at least 80 MHz
 
* Sensitivity (sine wave):
==Rear Interface==
** 20 mV RMS (56,6 mV_pp) below 15 MHz
<small>
** 35 mV RMS (99 mV_pp) at or below 50 MHz
{|
** 35 mV RMS @ 50 MHz derated down to 175 mV RMS (495 mV_pp) @80 MHz
|-
* Input impedance: 1 MΩ; 20 pF
| 28B − Gate Out, Totalize Start/Stop || 28A − Hold 
* Trigger Level Range: -1,5V to +1,5 V
|-
*Maximum Resolution
| 27B − Decimal point                ||
**Frequency kHz Positions: 0,1 Hz; 1 Hz and 10 Hz (Seven digit resolution possible in overflow kHz position)
|-
**Frequency MHz Positions: 100 Hz and 1 kHz (Nine digit resolution possible in overflow kHz position)
|                                    || 26A − /Reset
**Period msec Positions: 1µs and 10 µs
|-
**Period sec Positions: 10 ms; 1ms and 0,1 ms
|                                    || 25A − TS1 (digit select 1, MSD)  
*Trigger Error: 0,5% of one cycle at min, trigger sensitivity
|-
*Internal Standard Time Base (1 MHz)
| 24B − Scan clock out                || 24A − TS2 (digit select 2)
** Stability: 0°C to +50°C after 30 min warm up: 1E-5
|-
** Long Term Drift: 1E-5 per month
| 23B − Overflow                      || 23A − TS3 (digit select 3)
** Accuracy: Adjustable to within 1E-7
|-
*Internal Time Base Option 1 (5 MHz)
| 22A − TS4 (digit select 4)         ||
** Stability: 0°C to +50°C after 30 min warm up: eE-7
|-
** Long Term Drift: 1E-7 per month
| 21B − BCD out 2                    || 21A − TS5 (digit select 5, LSD)
** Accuracy: Adjustable to within 5E-9
|-
* Display Time: Variable  ~0,1 sec ... ~10 sec and HOLD mode
| 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==
==Pictures==
<gallery>
<gallery>
File:Tek dc504a.JPG | DC504A (intr. 1984)
Tek dc504a front.jpg|DC504A
Tek dc504 front.jpg|DC504
Tek dc504 front.jpg|DC504
Tek dc504 on.jpg|DC504
Tek dc504 on.jpg |DC504
Tek dc504 display.jpg|DC504
Tek dc504 display.jpg|DC504
Tek dc504 input.jpg|DC504
Tek dc504 input.jpg|DC504
Tek dc504 rear1.jpg|DC504
Tek dc504 rear1.jpg|DC504
Tek dc504 rear2.jpg|DC504
Tek dc504 rear2.jpg|DC504
Tek dc504a.jpg|DC504A
DC504-inside-component-side.jpg|DC504 inside; component side
DC504-inside-component-side.jpg|DC504 inside; component side
DC504-inside-copper-side.jpg|DC504 inside; copper side
DC504-inside-copper-side.jpg|DC504 inside; copper side
DC504A_Left_Internal.jpg|DC504A Internal Left Side
DC504A_Right_Internal.jpg|DC504A Internal Right Side
DC504A_3-4_View.jpg|DC504A 3/4 view.
</gallery>
</gallery>
==Components==
{{Parts|DC504}}

Latest revision as of 05:05, 1 December 2023

Tektronix DC504
80 MHz, 5-digit frequency counter
Tektronix DC504

Produced from 1975 to 1983

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DC504 is a 80 MHz, 5-digit frequency counter plug-in for the TM500 system.

It was superseded by the DC504A in 1984.

Key Specifications

Frequency Range DC (AC coupled: 10 Hz) to at least 80 MHz
Sensitivity 20 mVRMS sine wave below 15 MHz, 35 mVRMS to 50 MHz, derated down to 175 mVRMS at 80 MHz
Input impedance 1 MΩ // 20 pF
Trigger Level Range −1.5 V to +1.5 V
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)
Period resolution ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms
Display Time Variable ~0.1 s ... ~10 s and HOLD mode
Standard Time Base 1 MHz, ±1×10-5 from 0°C to +50°C, ±1×10-5 per month, Adjustable to within 1×10-7
Opt. 1 Time Base 5 MHz, ±1×10-7 from 0°C to +50°C, ±1×10-7 per month, Adjustable to within 1×10-9

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 Referencing DC504

Document Class Title Authors Year Links
070-2088-00.pdf Book TM500 Series Rear Interface Data Book 1975 AF501 • AM501 • AM502 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DM501 • DM502 • FG501 • FG502 • FG503 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • TG501
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976 AF501 • AM501 • AM502 • AM511 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DD501 • DM501 • DM502 • FG501 • FG502 • FG503 • FG504 • LA501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • SG504 • SW503 • TG501 • TR501 • TR502

Rear Interface

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)

Internals

The DC504 uses a Mostek MK5009P 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

  • DC504

    DC504

  • DC504

    DC504

  • DC504

    DC504

  • DC504

    DC504

  • DC504

    DC504

  • DC504

    DC504

  • DC504 inside; component side

    DC504 inside; component side

  • DC504 inside; copper side

    DC504 inside; copper side

Components

Some Parts Used in the DC504

Part Part Number(s) Class Description Used in
2N4249 151-0342-00 Discrete component PNP Si low noise amp. DC501 • DC502 • DC503 • DC503A • DC504 • DC504A • DC505 • DC505A • DC508 • DC508A • DC509 • DC510
Mostek MK5009 156-0410-00 Monolithic integrated circuit oscillator/counter DC504
Signetics 82S90 156-0482-01 Monolithic integrated circuit 85(100) MHz decade counter DC504
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