DC505: Difference between revisions

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{{TM500 | mfg=Tektronix | type=DC505 | function=225 MHz counter/timer | class=counter | image=Tek dc505.jpg | introduced=1974 | discontinued=1981 | designers= |manuals=
{{TM500 | mfg=Tektronix | type=DC505 | function=225 MHz counter/timer | class=counter | image=Tek dc505.jpg | introduced=1974 | discontinued=1976 |  
* [[Media:070-1665-00.pdf|Tektronix DC505 Manual]] (OCR, PDF)
|manuals=
* [[Media:070-1984-00.pdf|Tektronix DC505A Manual]] (OCR, PDF)
* [[Media:070-1665-00.pdf|Tektronix DC505 Manual]] (OCR)
}}
}}
 
It was superseded by the [[DC505A]] in 1976.
==Specifications==
{{BeginSpecs}}
{{Spec | Frequency range | 0 Hz (DC coupled) / 10 Hz (AC coupled) to 225 MHz }}
{{Spec | Sensitivity    | 50 mV<sub>RMS</sub> to 150 MHz, 100 mV<sub>RMS</sub> to 225 MHz (sine) }}
{{Spec | Resolution      | 7 digits }}
{{Spec | Gate time      | 0.01 s to 10 s in decade steps }}
{{Spec | Stability      | Standard: 1×10<sup>−5</sup>; Opt.1: 5×10<sup>−7</sup> (0°C to +50°C, after 30 min warm-up) }}
{{Spec | Long-term drift | Standard: 1×10<sup>−5</sup> per month; Opt.1: 5×10<sup>−7</sup> per month }}
{{Spec | Features        |
* Two input channels (BNC connectors)
* Two input channels (BNC connectors)
* 225 MHz
* Functions: Frequency, frequency ratio, period, interval, pulse width, events
* Functions: Frequency, frequency ratio, period, interval, pulse width, events
* Count: 7 digits
}}
* Gate time: 0.01 s to 10 s in decade steps
{{Spec | Options |
* Opt.1: 5 MHz TCXO (with ÷5 divider)
}}
{{EndSpecs}}


==Links==
==Links==
* [http://www.barrytech.com/tektronix/tektm500/tekdc505.html DC505 @ barrytech.com]
* [http://www.barrytech.com/tektronix/tektm500/tekdc505.html DC505 @ barrytech.com]
{{Documents|Link=DC505}}
==Rear Interface==
<small>
{| class="wikitable"
|-
! 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<br />Int 1 MHz out via 200 Ω
|}
</small>
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<sub>AC</sub> 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==
==Pictures==
<gallery>
<gallery>
Tek dc505.jpg | DC505
Tek dc505.jpg
Tek dc505a.jpg | DC505A
DC505 left.jpg
DC505 right.jpg
DC505 front 2.jpg
</gallery>
</gallery>
{{BetterPics}}
==Components==
{{Parts|DC505}}

Latest revision as of 06:21, 4 March 2024

Tektronix DC505
225 MHz counter/timer
Tektronix DC505

Produced from 1974 to 1976

Manuals
(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 mVRMS to 150 MHz, 100 mVRMS 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 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

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 VAC 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