Archive for December, 2015

National Instruments PXIe-1062Q, PXIe-8105 & PXI-4130

Saturday, December 12th, 2015

These were newly acquired in Nov 2015 from eBay.


PXIe-1062Q: for both PXI and PXIe cards with power supply.

PXIe-8105: controller for the system with upgrade to IDE 120 GB SSD from Kingspec (China) and 4 GB (2 x 2GB) DDR2 RAM.  Actually I found all on hand DDR2 ram with higher speed with work on this controller.  BIOS has also been updated to the latest version 1.3.3.  Speed wise is ok fast now with SSD and 4GB ram under window 7 32bit.



PXI-4130: SMU with two output: +/-20V max 2A and 9V 1A.  This supply can be programmed to check transistors or FETs under Labview.

The total cost is about USD$1500 but if getting a SMU with dual output will be much more expensive!

I shall learn and try to develop a program to sort the mosfet 2SK1530 / 2SJ201 soon.  Sorting of the Toshiba 2SK170 / J74 is also very good as the speed is supper fast and reading is stable with no oscillation concern.

USB GPIB adaptor 82357B from Agilent has big issue to link up with other equipment on the NI controller even I follow the steps as what is advised by Aglient website.  Finally I get the original NI GPIB cable Type X13 183285-02 and every things works perfectly.  No wonder the price of second hand USB-GPIB cable from Agilent is half of that from NI!

Changing the 3V back up battery in the PXIe-8105 controller must need reset the reset jumper pins or else the controller cannot boot up at all.


Suntex EC-4110 conductivity transmitter repair

Saturday, December 12th, 2015

The is a meter used in DI water conductivity monitoring and failure symptom is no display.  Quick analysis show that the Switch Mode power supply inside has no output.  Thus it should be an easy fix but …


The switch mode power supply provide about 10W to the controller and thus it is stack on top of bigger pcb using some pin header.  The AC main filter, fuse, current limit etc are house on the bottom bigger pcb and the whole SWPS is on the small PCB.  The design is using a DIP-7 pin IC as the switch but the part number of it is masked (removed).  Thus the circuit need to be traced by reverse engineering as shown on the draft.  After searching on internet, the only match part is from ROHM BM2Pxx4 series IC.  Thus I decided to get in the BM2P014 for trial.  Other problem seen in the power supplier PCB is one 10u 400V capacitor swell on top and after removing it found capacitor value 99% gone.  Thus I also order two Nichicon 105 degC grade for replacement.  When I first replace the IC BM2P014, the supplier seems to output voltage but about 2 minutes, there is no more output and thus the NEW IC is spoil!  So left only one ICs on hand a bit worry not to get it repaired!  After looking around, I remove the capacitor at pin 5 (Vcc supplier filter) and also found no capacitance value!  Thus I concluded that the failure is caused by poor filter of the Vcc supply and then kill the ICs after some time.  Due to that I also change all the E-cap on the output side of the supply and measurement show that most of the capacitors are out of spec with lower capacitor value due to prolong use of the meter (non stop).  I just wonder why the meter use such low grade unbranded so call 105 degC capacitors inside this industry meter!  The cost to get replacement for this meter is about US$650 !!!

PCB Assembly:

IMG_2070SMPS with DIP-7 IC and two 10u 400V capacitors removed:


Draft circuit of the SMPS:IMG_2130

Components ordered from Mouser:IMG_2115

Defective parts from SMPS:


Final repaired power supply:IMG_2125

Note the output of power supply is +12V 0V -12V; Ve is oV and Vf is 24V.