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.
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Tektronix P6247 probe repair and internal photos
October 12, 2011 - filed under: Test Equipment
I won this lot of 5 pcs Tektronix P6247 differential probes about 2 years ago from Seagate Singapore sales.
1. Out of 5, only two probe tip heads are working and thus I am able to recover two probes in full working conditions after repairs and adjustments. Thus it is a real bargain for me!
2. One box is with two burnt logic ICs inside and no way I can repair it! What I can do is just repair the connection cable.
3. Another box is working but with X10 not functioning. Guess there is some logic defective inside.
4. The other box is with unknown conditions as I have not tested it with a working probe tip head. Believe it is working conditions as I check the voltage at probe tip socket is normal conditions.
5. All the 5 connection wires were repaired. The usual defective point is the probe head joining point loose and control wires may be broken or intermittent connection. I peel off more plastic of the coaxial cable ground and wrap it with some ground shielding cable and then solder the ground wire onto the frame of the tip socket end. After that wire connection is checked one by one by multimeters.
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This P6247 differential probe is very good for testing high frequency signal as it only has below 1pF capacitance value. It also has x1 and x10 selection, AC and DC mode plus the bandwith limit of 200Mhz. I use that with a tek 1103 probe power supply and then I can connect it to any measurement equipment with 50 ohm termination like oscilloscope, frequency meter, spectrum analyzer etc…
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Here I put up some photos which will be very easy to understand more about the repair:
