DC505

Tektronix DC505
225 MHz counter/timer Tektronix DC505 Produced from 1974 to 1976 Manuals Tektronix DC505 Manual (OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix DC505 is a 225 MHz counter/timer plug-in for the TM500 system.

It was superseded by the DC505A in 1976.

Key Specifications

Frequency range	0 Hz (DC coupled) / 10 Hz (AC coupled) to 225 MHz
Sensitivity	50 mV_RMS to 150 MHz, 100 mV_RMS to 225 MHz (sine)
Resolution	7 digits
Gate time	0.01 s to 10 s in decade steps
Stability	Standard: 1×10⁻⁵; Opt.1: 5×10⁻⁷ (0°C to +50°C, after 30 min warm-up)
Long-term drift	Standard: 1×10⁻⁵ per month; Opt.1: 5×10⁻⁷ per month
Features	Two input channels (BNC connectors) Functions: Frequency, frequency ratio, period, interval, pulse width, events
Options	Opt.1: 5 MHz TCXO (with ÷5 divider)

Links

Documents Referencing DC505

Document	Class	Title	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
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 DC505

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	Connector Pin	Signal
		27A	Internal Scan Clock Disable
26B	Manual Start-Stop	26A	/RESET
25B	Internal Scan Clock Out	25A	Time Slot Zero
24B	Internal Scan Clock Out
23B	Overflow
21B	BCD output 2
20B	BCD output 8	20A	BCD output 4
19B	Data Good	19A	BCD output 1
		14A	Ext Clock Input Int 1 MHz out via 200 Ω

Data is output serially by digit.

Internals

An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements.

The DC505 uses a mix of ECL and TTL dividers and logic, and a Mostek MK5007 four-decade counter/latch/multiplexer (U700). Unlike the similarly-specified 7D15, it employs no Tek made custom ICs. The first counter decade is implemented as a divide-by-2 ECL flip-flop (U342, MC1670) followed by a five-stage ring counter made with MC10131 ECL flipflops, and some logic to BCD-encode the count result. A similar circuit exists in the reference divider chain.

In the power supply, a 723 regulator provides +5 V from the 17.5 V_AC mainframe rails using the mainframe's NPN pass transistor. Its output includes a zener/SCR crowbar circuit. Another 723 provides +15 V from the +33 V rail. A discrete regulator using the PNP pass transistor produces –10 V from the –33 V rail.

Pictures

Better pictures needed - please contribute

Components

Some Parts Used in the DC505

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 MK5007	156-0409-00	Monolithic integrated circuit	four-decade BCD counter with latches and output multiplexer	213 • DC505 • DC505A