Products > Test Equipment
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fourfathom:
I've got a bunch of homebrew test gear.  The photo shows a 10W RF attenuator, a resistive 4-way splitter, and a Time Interval Counter (TIC) of my own design and build.  The TIC has this inside:


* A 100MHz internal clock (a PLL inside a gate-array), which can be locked to either an internal 10MHz TCXO, or an external reference (such as the Bodnar GPSDO I usually use).
* Four inputs, AC or DC coupled, 50 Ohm or 10 Meg termination, >100 MHz input response.  Any of the four inputs can be used as the external reference clock
* Selectable divide-by-ten prescaler, settable 32-bit divider for each of the four measurement channels,  Rising/falling edge selection
* Timestamp capture for each measurement channel, 10 ns resolution. Event / Interval / Period / Frequency calculation and reporting
* An internal NCO / mixer / filter which provides high-resolution measurements of  narrowband high-frequency inputs (example: < 10 milliHz resolution of a 10 MHz input at a 10 Hz measurement rate)
* OLED display (the photo shows the screensaver, a scrolling sinewave to reduce OLED pixel burn)
* USB "serial port" control and reporting interface to external programs.  About 50 measurements per second max reporting rate (serial port limitations)
The chart photo shows a frequency vs temperature measurement I made this morning, testing the TCXO in a ham transceiver.  The chart shows a frequency of about 100 Hz; this is actually the difference between the 25 MHz TCXO and the internal NCO.  This shows that the TCXO frequency is varying by about 3Hz.  I used a modified "Reptile Incubator" with a homebrew controller as a temperature chamber.  Notice the frequency "retrace" as the temperature cycles up and down.

I've got lots more homebrew gear, but I had these photos handy.
paul@yahrprobert.com:

--- Quote ---GPIB / USB adapter.
--- End quote ---
Very nice GPIB adapter.  What design is that? It looks similar to the Galvant design.
dobsonr741:
DDS function generator based on AD9833, VCA822, TLV5618, Raspberry Pi Pico. Controllable by SCPI and a UI, has a bonus +/-3V programmable voltage source with 12 bit resolution. Attenuator down to -60dB.
MrYakimovYA:
8 channel thermometer. DS18B20 as a sensor. Raspberry Pi Pico (clone) inside.
MrYakimovYA:
High Resistance Standard. For calibration of a picoammeter that I'm developing. Upper red banana jack was replaced with BNC later.
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