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{{TM500 | mfg=Tektronix | type=DC502 | function=550 MHz frequency counter | class=counter | image=Tek dc502 opt1 1.jpg | introduced=1972 | discontinued=1977 | manuals=
{{TM500
* [[Media:DC502 070-1412-00.pdf|Tektronix DC502 Manual (PDF)]]
|mfg=Tektronix
|type=DC502
|function=550 MHz frequency counter
|class=counter
|image=Tek dc502 opt1 1.jpg
|introduced=1972
|discontinued=1977
|designers=Jim Geddes
|manuals=
* [[Media:070-1412-00.pdf|Tektronix DC502 Instruction Manual 070-1412-00]] (OCR)
* [[Media:050-1276-00.pdf|DC501, DC502, DC503 Service Note 050-1276-00]]
}}
}}
It measures frequencies from 10 Hz to 550 MHz or totalizes events up to the readout capacity of 10<sup>7</sup>-1 at the maximum rate of 550 MHz.
It measures frequencies from 10 Hz to 550 MHz or totalizes events up to the readout capacity of 10<sup>7</sup>−1 at the maximum rate of 550 MHz.
 
==Specifications==
 
* Direct Counting to 110 MHz
* 7 Digit LED Display
* Manual Start/Stop (Totalize)
* Gate times: 0.01 s, 0.1 s, 1.0 s, and 10 s
* DIRECT INPUT:
** Frequency range: 10 Hz to 110 MHz
** Input impedance: 1 MΩ
** Sensitivity: 300 mV<sub>p-p</sub> (100 mV<sub>rms</sub> sine wave)
** adjustable trigger level range
* &divide;10 PRESCALE INPUT:
** Frequency range: 50 MHz to 550 MHz
** Sensitivity: 500 mV<sub>p-p</sub> (170 mV<sub>rms</sub> sine wave)
** Input impedance: 50 &Omega;


{{BeginSpecs}}
{{Spec|Resolution      | 7 digits}}
{{Spec|Frequency range | 10 Hz to 110 MHz (Direct input); 50 MHz to 550 MHz (÷10 input) }}
{{Spec|Sensitivity    | 300 mV<sub>p-p</sub> or 100 mV<sub>rms</sub> sine (Direct input); 500 mV<sub>p-p</sub> or 170 mV<sub>rms</sub> sine (÷10 input) }}
{{Spec|Input impedance | 1 MΩ (Direct input); 50 Ω (÷10 input) }}
{{Spec|Gate time      | 0.01 s, 0.1 s, 1.0 s, or 10 s }}
{{Spec|Stability      | 1×10<sup>−5</sup> (10 ppm) standard, 5×10<sup>−7</sup> (0.5 ppm) with Opt.01}}
{{Spec|Features|
* 7-digit LED Display, automatic decimal point and leading zero blanking
* manual Start/Stop (Totalize)
* adjustable trigger level on direct input
}}
{{Spec|Options|
* Opt.01 – TCXO
* Opt.07 – to display [[SW503]] marker ([[Media:Tekscope_1976_V8_N1.pdf|Tekscope V.8 N.1 p.20]] and [[Media:070-2051-00.pdf|070-2051-00 p. 5-3]] – more information needed)
}}
{{EndSpecs}}
The manual totalizing mode with front panel start stop control is available in both inputs; from the prescale input, 1 displayed count per 10 input events will result.
The manual totalizing mode with front panel start stop control is available in both inputs; from the prescale input, 1 displayed count per 10 input events will result.
Measurement display is accomplished with 7 segment LEDs in a seven digit readout. The decimal point is automatically positioned by the measurement interval selected, and leading zeroes (those to the left of the most sig digit or those to the left of the decimal point) are blanked.


LEDs indicate when the gate is armed, and whether displayed numbers are in kHz or MHz, and when register overflow occurs.  
LEDs indicate when the gate is armed, and whether displayed numbers are in kHz or MHz, and when register overflow occurs.  


A standard internal 1 MHz clock is provided with 1 &times; 10<sup>-5</sup> (10 ppm) stability, but an "Option 01" 5 MHz clock is also available which provides 5 &times; 10<sup>-7</sup> (0.5 ppm) stability. That option includes additional circuitry to divide the clock frequency by 5 in order to obtain 1 MHz.
The internal clock is 1 MHz. The Opt.05 high stability oscillator runs at 5 MHz with an additional by-5 divider.


==Links==
==Links==
{{Documents|Link=DC502}}
{{PatentLinks|DC502}}


* [http://www.barrytech.com/tektronix/tektm500/tekdc502.html DC502 @ barrytech.com]
==Rear Interface==
<small>
{| class="wikitable"
|-
! Connector Pin
! Signal
|-
| 28B      || Second decimal point output
|-
| 27B      || MHz light output
|-
| 27A      || Internal Scan Clock Disable
|-
| 26A      || /RESET
|-
| 25B      || External Scan Clock input
|-
| 25A      || Time Slot Zero
|-
| 24B      || Internal Scan Clock output (2 kHz)
|-
| 23B      || Overflow
|-
| 22B      || MSD output
|-
| 21B      || BCD output 2
|-
| 20B      || BCD output 8
|-
| 20A      || BCD output 4
|-
| 19A      || BCD output 1
|-
| 19B      || Data Good
|}
Data is output serially by digit.
</small>


==Pictures==
==Pictures==
Line 39: Line 86:
Tek sw503 dc502 sg504 dc508a mr501 tm515.png|DC502 in [[TM515]] with other TM500 gear
Tek sw503 dc502 sg504 dc508a mr501 tm515.png|DC502 in [[TM515]] with other TM500 gear
</gallery>
</gallery>
==Components==
{{Parts|DC502}}


[[Category:TM500 counter plugins]]
[[Category:TM500 counter plugins]]
[[Category:Frequency counters]]
[[Category:Frequency counters]]

Latest revision as of 04:54, 6 October 2024

Tektronix DC502
550 MHz frequency counter
Tektronix DC502

Produced from 1972 to 1977

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

The Tektronix DC502 is a 550 MHz frequency counter plug-in for the TM500 system.

It measures frequencies from 10 Hz to 550 MHz or totalizes events up to the readout capacity of 107−1 at the maximum rate of 550 MHz.

Key Specifications

Resolution 7 digits
Frequency range 10 Hz to 110 MHz (Direct input); 50 MHz to 550 MHz (÷10 input)
Sensitivity 300 mVp-p or 100 mVrms sine (Direct input); 500 mVp-p or 170 mVrms sine (÷10 input)
Input impedance 1 MΩ (Direct input); 50 Ω (÷10 input)
Gate time 0.01 s, 0.1 s, 1.0 s, or 10 s
Stability 1×10−5 (10 ppm) standard, 5×10−7 (0.5 ppm) with Opt.01
Features
  • 7-digit LED Display, automatic decimal point and leading zero blanking
  • manual Start/Stop (Totalize)
  • adjustable trigger level on direct input
Options

The manual totalizing mode with front panel start stop control is available in both inputs; from the prescale input, 1 displayed count per 10 input events will result.

LEDs indicate when the gate is armed, and whether displayed numbers are in kHz or MHz, and when register overflow occurs.

The internal clock is 1 MHz. The Opt.05 high stability oscillator runs at 5 MHz with an additional by-5 divider.

Links

Documents Referencing DC502

Document Class Title Authors Year Links
Tekscope 1972 V4 N3 May 1972.pdf Article TM500 series - A New Dimension in Plug-in Instrumentation Bob Ragsdale 1972 TM500 system • TM501 • TM503 • FG501 • FG502 • RG501 • PG501 • SG502 • DC501 • DC502 • PS501 • PS502 • PS503
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
070-2088-04.pdf Book TM500 Series Rear Interface Data Book 1985 AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010

Patents that may apply to DC502

Page Title Inventors Filing date Grant date Links
Patent US 3562464A Cam actuated switch having movable and fixed contacts on circuit board Howard Vollum • Willem H Verhoef • Tony Sprando 1968-10-07 1971-02-09 Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504

Rear Interface

Connector Pin Signal
28B Second decimal point output
27B MHz light output
27A Internal Scan Clock Disable
26A /RESET
25B External Scan Clock input
25A Time Slot Zero
24B Internal Scan Clock output (2 kHz)
23B Overflow
22B MSD output
21B BCD output 2
20B BCD output 8
20A BCD output 4
19A BCD output 1
19B Data Good

Data is output serially by digit.

Pictures

  • DC502 in TM515 with other TM500 gear

    DC502 in TM515 with other TM500 gear

Components

Some Parts Used in the DC502

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
2N4851 151-0504-00 • 151-0504-01 Discrete component silicon unijunction transistor DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • LA501 • R1330 • 212 • 214 • 4002A • 4623 • 4631 • 4632 • 4633A • 4634 • 4701 • 4701R • 670-0696-01 • 670-1274-00 • 670-1981-00 • 670-1981-01 • 7D01 • 7D12 • 7L12
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