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Tour inside HP5245L

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norEL:
Here is a tour inside my HP5245L frequency counter.
Specs.

Range: dc to 50MHz
Gate time: 1us to 10sec in decade steps.
Accuracy: +- 1count +- time base accuracy.

Period average measurements.

Range: dc to 1MHz for single period; dc to 300KHz for multiple period.
Periods averaged: 1 period to 100 000 periods in decade steps.
Accuracy: +- 1count +- 1 time base accuracy +- trigger error

Mainframe measurement functions: frequency, period, period average, ratio and scaling.

Signal input

Sensitivity: 100mV rms.
Coupling: AC and DC.
Impedance: 1Mohm in parallel with approx. 25pF all ranges.
Attenuation: step attenuator provides nominal sensitivities of 0.1, 1 and 10V rms
Trigger level: continuously adjustable over +- 3V multiplied by  the setting of the sensitivity switch.
Time base: 10MHz oscillator, aging rate <3 x 10000000000/day.
Display: 8digits.
Operating temperature range: -20*C to +65*C.
Weight: net. 14,4kg (32lb) without plug-in.
Size: 133H x 425W x 416D mm.
Price when it was new: $5000

The tour is two parts, one from above and one from underside.
Part one:

Part two:

tekfan:
Nice one! I've got the same counter with the 0.3-3GHz plugin. Very nice and useful retro counter (sadly not reciprocal). Not a single IC in this one. Only discrete transistors. The digit storage was done by means of neon lamps and selenium? photocells. There are about 10 lamps hidden in the black plastic behind each nixie tube. The last digit receives the full 50MHz so it is a special selected module.

Amazingly mine was made in England around 1975. Imagine that HP still made completely discrete counters when high speed logic was already available for some time.
Wen was your HP5245L made

norEL:

--- Quote from: tekfan on October 18, 2011, 07:20:25 pm ---Nice one! I've got the same counter with the 0.3-3GHz plugin. Very nice and useful retro counter (sadly not reciprocal). Not a single IC in this one. Only discrete transistors. The digit storage was done by means of neon lamps and selenium? photocells. There are about 10 lamps hidden in the black plastic behind each nixie tube. The last digit receives the full 50MHz so it is a special selected module.

Amazingly mine was made in England around 1975. Imagine that HP still made completely discrete counters when high speed logic was already available for some time.
Wen was your HP5245L made

--- End quote ---

It's a very nice counter! It is hard to find a production date on mine, the pcb's got different dates on them, but the earliest date is OCT. 1972. But if it was made in 1972??
I have a plug-in on mine too, but not absolutely sure about the specs. hard to find some info.. What is the model number on your 3GHz plug-in?

tekfan:
This is a very nice site for old HP and Tek test equipment:
http://www.barrytech.com/

Go to: HP components > counters

There's a nice list of many HP counters and plugins

I've got the 5254A plugin.

I think this is the manual for your plugin:
http://www.kennethkuhn.com/hpmuseum/scans/hp5262a.pdf

norEL:

--- Quote from: tekfan on October 18, 2011, 09:28:03 pm ---This is a very nice site for old HP and Tek test equipment:
http://www.barrytech.com/

Go to: HP components > counters

There's a nice list of many HP counters and plugins

I've got the 5254A plugin.

I think this is the manual for your plugin:
http://www.kennethkuhn.com/hpmuseum/scans/hp5262a.pdf

--- End quote ---

Thank you for the link`s!! I have tried to find some info on the plug-in since I got the counter. So I am very happy now! Now I have to read and learn  :D
My plug-in is 5263A but look`s identical too the 5262A.

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