Archive for the ‘Test Equipment’ Category

hp 5334A Frequency Counter 100MHz

Sunday, July 23rd, 2017

Pick up this in junk yard for a low price and found inside all corrosive due to battery leakage!  After I do a cleaning and washing on the main PCB and replace all 6 pcs 100uF 15V cap with new Panasonic FC capacitors,  the set can work as it is.  Gone through performance check and all ok, self diagnostic also all OK, frequency can measure up to 105 MHz and level down to 35mVpp which is a bit better than spec.  Date code of part is mostly at year 1986, this this is a 30 years old hp equipment and is still working fine!  Made in USA.


Leader 1507A Repair (3-51FT-A Replacement)

Saturday, July 1st, 2017

This digital signal generator was stored for too long time and the internal battery was leaking and corroded the PCB near by.  After removing the battery (Nicad 3-51FT-A) and cleaning the PCB, power on test show that there was no display on the front panel.  One 1k resistors was also replaced in the charging circuit and put back a 3.7V 110mAh Ni-Polymer rechargeable battery, but the set still could not power on.  Note that the battery was got from ebay China seller with only SGD$0.9 and free shipping!  It is a 110mAh capacity and the original batter is 80mAh capacity.

After measuring the rail voltage, it was find that the two 5V supply after the regulator JRC 7805A was not at normal voltage, one close to zero and another one 4.5Vdc. Replacing the two regulators with Toshiba 7805S regulator and the set is back to normal.  Here are some photos for the repaired set.

NI PXIe-8370, PCIe-8371, PXI-GPIB upgrade

Saturday, November 26th, 2016

I was using NI PXIe-8105 embedded controller in my NI PXIe-1062Q chassis but the speed is too slow.  Recently I have acquired the controller card PXIe-8370 (about 800MB/s; pcie x 4).  The PCIe-8371 card can be put  in my computer PCIe x 16 slot (for VGA card) and function perfectly. Mother Board is Gigabyte H77N ITX version. OS is WIN7 64bit version and both the NI and audio precision system two cascade is working fine with an I5-3570K CPU.  The fan noise of the NI chassis is even lower then before and the power loading is lesser without the embedded controller!


Without the embedded controller, I lost some I/O like parallel port, GPIB etc… and thus I have to get one more PXI-GPIB card.  Later I find out my Agilent 82357B USB – GPIB controller is also working fine in with NI system.  In the past, I plug the USB into PXIe-8105 but cannot make it work properly!  Thus the PXI-GPIB card become excess!

Key sight DSO-X 3024T firmware update

Friday, November 25th, 2016

Update: 3rd July, 2017

Further updated firmware to 07.11.2017061225 version.

Keysight has released new firmware 04.08 for DSO-X 3024T and here are the photos of upgrade process.  The whole process take about 5-6 mins.


Audio Precision USB APIB Adapter (inside photos)

Saturday, November 19th, 2016

I am using PCMCIA to APIB to control my AP system two cascade under winxp.  The PC is celeron with PCMCIA slot and thus is running very slow.  One way is to use a PCI to PCMCIA adapter if PC is to be upgraded.  I just have one i5  – 3570K with 8GB ram and ITX Mother Board and thus no PCI slot!

Recently I saw a old AP USB to APIB adapter on ebay for about US$350 and thus I think it is time to upgrade the speed of the AP system. 

Here is some photos inside the adapter.

USB interface – Cypress CY7C68014A-128AXC

74ATC240 / 74ACT245

4420P-G01 / 4816P 

See photos for details.