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{{TM500 | mfg=Tektronix | type=DC504 | function=100 MHz, 5-digit frequency counter | class=counter | image=Tek dc504 on.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=
* [[Media:070-1670-01.pdf|DC504 Manual]] (OCR, PDF)
* [[Media:070-1670-01.pdf|DC504 Manual]] (OCR)  
* [[Media:070-4291-00.pdf|DC504A Manual]] (OCR, PDF)
}}
}}
The DC504A has 6 digits.
It was superseded by the [[DC504A]] in 1984.
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec|Frequency Range | 0 Hz (AC coupled: 10 Hz) to at least 80 MHz}}
{{Spec|Frequency Range     | DC (AC coupled: 10 Hz) to at least 80 MHz }}
{{Spec|Sensitivity (sine wave) | 20 mV<sub>RMS</sub> below 15 MHz, 35 mV<sub>RMS</sub> to 50 MHz, derated down to 175 mV<sub>RMS</sub> at 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|Input impedance     | 1 MΩ // 20 pF}}
{{Spec|Trigger Level Range| −1.5 V to +1.5 V}}
{{Spec|Trigger Level Range | −1.5 V to +1.5 V}}
{{Spec|Maximum 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|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|Maximum period resolution| ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms}}
{{Spec|Period resolution   | ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms}}
{{Spec|Trigger Error| 0.5% of one cycle at min. trigger sensitivity }}
{{Spec|Display Time         | Variable  ~0.1 s ... ~10 s and HOLD mode}}
{{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>}}
{{SpecGroup|Internal Standard Time Base (1 MHz)}}
{{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>}}
{{Spec|Stability| 0°C to +50°C after 30 min warm up: 1×10<sup>-5</sup>}}
{{Spec|Long Term Drift|1×10<sup>-5</sup> per month}}
{{Spec|Accuracy|Adjustable to within 1×10<sup>-7</sup>}}
{{SpecGroup|Internal Time Base Option 1 (5 MHz)}}
{{Spec|Stability | 0°C to +50°C after 30 min warm up: 1×10<sup>-7</sup>}}
{{Spec|Long Term Drift| 1×10<sup>-7</sup> per month}}
{{Spec|Accuracy| Adjustable to within 5×10<sup>-9</sup>}}
{{EndSpecs}}
{{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==
==Pictures==
===DC504===
<gallery>
<gallery>
Tek dc504 front.jpg|DC504
Tek dc504 front.jpg|DC504
Line 36: Line 70:
DC504-inside-copper-side.jpg|DC504 inside; copper side
DC504-inside-copper-side.jpg|DC504 inside; copper side
</gallery>
</gallery>
===DC504A===
 
<gallery>
==Components==
Tek dc504a.JPG | DC504A (intr. 1984)
{{Parts|DC504}}
Tek dc504a front.jpg|DC504A
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>

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
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976

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

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