Lecroy DDA-120 Jitter measurement
December 2, 2011 - filed under: Test Equipment
I acquired this machine for a month from Seagate Singapore but this set do not have the JTA software option for jitter measurement. I have asked Lecroy for the cost of JTA option but they want to charge me 5k USD ! Anyway DDA-120 is for disk drive analysis and it has a simple jitter measurement using period@level function. Also it has period, frequency, sigma and histogram function which is good enough to do some clock signal jitter measurment as below:
I have also taken some measurements of DAC chips as in attached file. They are WM8804, CS8416, DIR9001; SRC: CS8421, SRC4192 & AD1896. The measurement is on the MCLK (master clock) of the DAC FDA-1 in different test version durng development.
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hp 6632A System DC Power Supply
November 15, 2011 - filed under: Test Equipment
This is a very old machine used for automatic tester with HPIB control capability. There is some very good old transistors as shown. The transformer is still EI type and thus the set very heavy even the size is not big! The bad thing about this supply is too noisy for lab use due to fan noise. But it is a very low noise and high speed power supply from 0 to 20V and 5A maximum. If you want to change the input AC voltage, you have to open the set and select by two switches near the IEC socket.
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hp 3324A function generator photos
November 14, 2011 - filed under: Test Equipment
I acquired this function generator in Oct 2011 and here is some internal photos to share. My set is with the internal 10Mhz reference oscillator option.
