7D15
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
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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
Prices
| Year | 1973 | 1976 | 1980 | 1984 | 1990 |
|---|---|---|---|---|---|
| Price | $1,475 | $1,600 | $2,200 | $3,200 | $4,400 |
| 2015 value | $7,840 | $6,640 | $6,300 | $7,270 | $7,950 |
Pictures
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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
