7D15: Difference between revisions
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title=Tektronix 7D15 | | title=Tektronix 7D15 | | ||
summary=225 MHz Frequency Counter | | summary=225 MHz Frequency Counter | | ||
image=Tek 7d15. | image=Tek-7d15-front.jpg | | ||
caption=Tektronix 7D15 | | caption=Tektronix 7D15 | | ||
introduced=1973 | | introduced=1973 | | ||
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The '''Tektronix 7D15''' is a 225 MHz frequency counter plug-in for [[7000-series scopes]]. | The '''Tektronix 7D15''' is a 225 MHz frequency counter plug-in for [[7000-series scopes]]. It is optimized for timing measurements, having a 100 MHz oscillator and interval measurement averaging capability. It has two inputs and can measure frequency, period or time difference. | ||
The front panel uses [[Connectors#SMB|SMB connectors]] for arming, clock in/out and reset signals. | The front panel uses [[Connectors#SMB|SMB connectors]] for arming, clock in/out and reset signals. | ||
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==Internals== | ==Internals== | ||
The 7D15 uses a number of Tek-made custom chips. The [[155-0086-00]], [[155-0087-00]] and [[155-0088-00]] legend generators are specific to this plug-in. The [[155-0090-00]] or [[155-0171-00]] four decade counter/latch/DAC chips implement the lower six counter digits. For the topmost two digits, the 7D15 employs ECL counters. ECL logic requires a -5 V supply, which a switching regulator (board A8) generates from the -15 V rail. | |||
The 5 MHz signal from the (non-ovenized) internal reference crystal oscillator is divided down to a 1 MHz master clock. Optionally, the 1 MHz can be supplied externally as well. An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements. | |||
==Links== | ==Links== | ||
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<gallery> | <gallery> | ||
File:Tek 7d15 front.jpg | File:Tek-7d15-front.jpg | 7D15 front | ||
File:Tek 7d15. | File:Tek-7d15-left.jpg | 7D15 left side. Note -5 V switching regulator (board A8) on the far left. | ||
File:Tek-7d15-right.jpg | 7D15 right side | |||
</gallery> | </gallery> | ||
Revision as of 05:15, 30 April 2015
The Tektronix 7D15 is a 225 MHz frequency counter plug-in for 7000-series scopes. It is optimized for timing measurements, having a 100 MHz oscillator and interval measurement averaging capability. It has two inputs and can measure frequency, period or time difference.
The front panel uses SMB connectors for arming, clock in/out and reset signals.
Specifications
please add
Internals
The 7D15 uses a number of Tek-made custom chips. The 155-0086-00, 155-0087-00 and 155-0088-00 legend generators are specific to this plug-in. The 155-0090-00 or 155-0171-00 four decade counter/latch/DAC chips implement the lower six counter digits. For the topmost two digits, the 7D15 employs ECL counters. ECL logic requires a -5 V supply, which a switching regulator (board A8) generates from the -15 V rail.
The 5 MHz signal from the (non-ovenized) internal reference crystal oscillator is divided down to a 1 MHz master clock. Optionally, the 1 MHz can be supplied externally as well. An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements.
Links
Pictures
please add
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7D15 front
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7D15 left side. Note -5 V switching regulator (board A8) on the far left.
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7D15 right side
