DC508A

Tektronix DC508A
1.3 GHz counter Tektronix DC508A Produced from 1980 to 1983 Manuals DC508A Manual 070-3638-00 (Manuals are OCRed PDF files unless noted otherwise)

The Tektronix DC508A is a 1.3 GHz counter plug-in for the TM500 system.

It replaced the previous DC508 version (1978), extending the frequency range to 1.3 GHz.

Key Specifications

Frequency Range	10 Hz – 100 MHz direct; 100 MHz – 1.3 GHz via prescaler, gate times 8 ms to 8 s in decade steps
Input	15 mV_RMS, 1 MΩ // 25 pF, max. 400 V peak (derate above 0.75 MHz); prescaler, 20 mV_RMS, 50 Ω input, fused, max. 7 V peak; rear interface, 125 mV_RMS 10 Hz – 50 MHz, ≤4 V peak
Resolution	9 digits
Gate times	1 ms to 10 s in decade steps; plus totalize mode
Functions	Frequency, events

Option 1 − High accuracy time base
Option 7 − Accepts rear panel control signals from a TR502 or SW503 to measure a marker frequency. Resolution and gating remote control circuitry is added to the DC508(A). Requires a TM503 - option 7 or an appropriately modified mainframe. This option inherently also adds option 1.

Document	Class	Title	Authors	Year	Links
Tekscope 1980 V12 N4.pdf	Article	New Products		1980	4634 • TR503 • FG507 • DC508A • 8550 • S-3275
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

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 • 067-0938-00 • 1401 • 1401A • 1405 • 1501 • 214 • 2101 • 2701 • 2703 • 26G3 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A22N • 5A26N • 5A38 • 5A45 • 5A48 • 5B10N • 5B12N • 5B31 • 5B40 • 5B42 • 5B44 • 7A15 • 7A16A • 7A18 • 7A18A • 7A19 • 7A22 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7CT1N • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DC508 • DC508A • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG503 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504 • SG505 • T912 • T921 • T922 • T922R • T932 • T935

The DC508A uses an off-the-shelf Plessey SP8611B divide-by-4 counter IC (Tek part number 156-1302-01) as the prescaler, which is rated to 1.5 GHz.

Better pictures needed - please contribute

Part	Part Number(s)	Class	Description	Used in
155-0119-00	155-0119-00	Monolithic integrated circuit	9-decade latch, 5-digit BCD counter and multiplexer	DC508 • DC508A
2N4249	151-0342-00	Discrete component	Si PNP low-noise transistor	5A18N • 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
2N5060	151-0503-00	Discrete component	30 V, 0.8 A thyristor (SCR)	CG551AP • C-50 • C-51 • C-52 • C-53 • C-70 • DC505 • DC505A • DC508 • DC508A • 1240 • 1241 • 212 • 213 • 214 • 4014 • 4015 • 4025 • 4027 • 4105 • 4106 • 4107 • 4109 • 4111 • 450 • 4623 • 4631 • 4632 • 4633A • 485 • 5D10 • 5223 • 7D10 • 7D11 • 7L12 • 7L13 • 7L14 • 7L18 • 7912AD • 91HS8
Plessey SP8611B	156-1302-01	Monolithic integrated circuit	1.3 GHz divide-by-4 prescaler	DC508A