DC503A: Difference between revisions
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{{TM500 | mfg=Tektronix | type=DC503A | function=125 MHz, | {{TM500 | mfg=Tektronix | type=DC503A | function=125 MHz, 8-digit frequency counter | class=counter | image=dc503a.jpg | introduced=1981 | discontinued=1993 | ||
|designers=Roland Crop;Jim Geddes | |designers=Roland Crop;Jim Geddes | ||
|manuals= | |manuals= | ||
* [[Media:070-2971-00.pdf|DC503A Manual]] (OCR) | * [[Media:070-2971-00.pdf|DC503A Manual]] (OCR) | ||
* [[Media:TM_9-6625-474-14.pdf|DC503A Military Manual]] | * [[Media:TM_9-6625-474-14.pdf|DC503A Military Manual]] | ||
}} It replaced the [[DC503]] in 1981. | }} | ||
It replaced the [[DC503]] in 1981. | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Frequency Range | | {{Spec|Resolution | 8 digits}} | ||
{{Spec | Frequency Range | DC (AC coupled: 10 Hz) to ≥125 MHz }} | |||
{{Spec | Impedance | 1 MΩ paralleled by approx. 27 pF}} | {{Spec | Impedance | 1 MΩ paralleled by approx. 27 pF}} | ||
{{Spec | Sensitivity | 20 mV<sub>RMS</sub> | {{Spec | Sensitivity | 20 mV<sub>RMS</sub> sine to 100 MHz, 35 mV<sub>RMS</sub> sine to 125 MHz }} | ||
{{Spec | Max Input Voltage | 1× Atten: 200 V<sub>peak</sub>, 400 V<sub>p-p</sub> @ DC − 50 kHz; 200 V<sub>peak</sub>, ≤(20/f) V<sub>p-p</sub> @ 50 kHz − 1.33 MHz; 200 V<sub>peak</sub>, ≤15 V<sub>p-p</sub> @ 1.33 – 125 MHz }} | {{Spec | Max Input Voltage | 1× Atten: 200 V<sub>peak</sub>, 400 V<sub>p-p</sub> @ DC − 50 kHz; 200 V<sub>peak</sub>, ≤(20/f) V<sub>p-p</sub> @ 50 kHz − 1.33 MHz; 200 V<sub>peak</sub>, ≤15 V<sub>p-p</sub> @ 1.33 – 125 MHz }} | ||
{{Spec | Max Input Voltage | 5× Atten: 200 V<sub>peak</sub>, 400 V<sub>p-p</sub> @ DC − 5 MHz; 200 V<sub>peak</sub>, ≤(2000/f) V<sub>p-p</sub> @ 5 − 100 MHz; 200 V<sub>peak</sub>, ≤20 V<sub>p-p</sub> @ 100 – 125 MHz }} | {{Spec | Max Input Voltage | 5× Atten: 200 V<sub>peak</sub>, 400 V<sub>p-p</sub> @ DC − 5 MHz; 200 V<sub>peak</sub>, ≤(2000/f) V<sub>p-p</sub> @ 5 − 100 MHz; 200 V<sub>peak</sub>, ≤20 V<sub>p-p</sub> @ 100 – 125 MHz }} | ||
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Tek dc503a on.jpg|DC503A | Tek dc503a on.jpg|DC503A | ||
Tek dc503a left internal.jpg|DC503A left internal | Tek dc503a left internal.jpg|DC503A left internal | ||
DC503A right.jpg | right internal | |||
DC503A left.jpg | left internal (Opt.01) | |||
</gallery> | </gallery> | ||
==Components== | ==Components== | ||
{{Parts|DC503A}} | {{Parts|DC503A}} |
Latest revision as of 10:14, 6 December 2023
The Tektronix DC503A is a 125 MHz, 8-digit frequency counter plug-in for the TM500 system.
It replaced the DC503 in 1981.
Key Specifications
Resolution | 8 digits |
---|---|
Frequency Range | DC (AC coupled: 10 Hz) to ≥125 MHz |
Impedance | 1 MΩ paralleled by approx. 27 pF |
Sensitivity | 20 mVRMS sine to 100 MHz, 35 mVRMS sine to 125 MHz |
Max Input Voltage | 1× Atten: 200 Vpeak, 400 Vp-p @ DC − 50 kHz; 200 Vpeak, ≤(20/f) Vp-p @ 50 kHz − 1.33 MHz; 200 Vpeak, ≤15 Vp-p @ 1.33 – 125 MHz |
Max Input Voltage | 5× Atten: 200 Vpeak, 400 Vp-p @ DC − 5 MHz; 200 Vpeak, ≤(2000/f) Vp-p @ 5 − 100 MHz; 200 Vpeak, ≤20 Vp-p @ 100 – 125 MHz |
Options
- Opt. 01 — OCXO
Links
- Tektronix DC503A Frequency Counter OCXO Mod by NFM @ YouTube
Documents Referencing DC503A
Rear interface
27B − Decimal point | |
26B – Remote Start | 26A − /Reset |
25A − TS1 (digit select 1, MSD) | |
24B − Scan clock out | |
23B − Overflow | |
22B − Ch.B Level | 22A − Ch.A Level |
21B − BCD out 2 | 21A − TTL Clock Input |
20B − BCD out 8 | 20A − BCD out 4 |
19B − Latch Out (Data Good) | 19A − BCD out 1 |
17B – Ch B Input | 17A – Ch A Input GND |
16B – Ch B Input GND | 16A − Ch A Input |
15B – 10 MHz Ref Out | 15A – Clock GND |
14A − External Clock In |
Internals
The DC503A is implemeted in a mix of ECL, TTL, and MOS ICs. uses an LS7031 6-digit counter IC, and two 74LS288 PROMs that encode decimal point position and annunciators.
Pictures
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DC503A
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DC503A
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DC503A left internal
-
right internal
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left internal (Opt.01)
Components
Some Parts Used in the DC503A
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 |