R&S NGMO2 Front Connectors
The Rohde Schwarz NGMO2 is one of the lab power supplies that I use most. Having the connectors on the back is not convnient most of the times. I always wanted to have the NGMO2-B0 option that consists on a box that is attached to the bottom of the power supply and provides power and […]
Rohde & Schwarz FSIQ IF-Filter Module Repair
The result of buying a “defekt” FSIQ unit from eBay Germany was that I ended up with a huge instrument lying around for months, with little hopes of ever getting it repaired. The RF CONVERTER module had a (unrepairable for me) YIG unit and I managed to get a used, but working, RF CONVERTER module. […]
Tektronix MDO3014 50 Ohm inputs repair
My MDO3014 oscilloscope seemed to work fine with the high impedance probes but when I checked the inputs at 50 ohm with the fast risetime pulse generator from Leo Bodnar (link) the traces did not look right… three of them clearly showed ringing: Checking the input impedances The first thing […]
HP 8752A LCD KIT
The 8752A VNA is a wonderful instrument, but it has many years on its back, and you may find yourself with a barely readable, or funky-looking screen due to aged CRT. I have an article dedicated to the CRT to LCD conversion I devised for the HP 8920A. But that was me doing my best […]
DSO-X Colorblind hack
I suffer the most common type of colorblindness, the red-green type, and more specifically, deuteranopia. This essentially means that I have difficulty telling colors with red and green components from each other. If you can’t see anything but a bunch of dots here (as I do) but you believe you can see correctly, you may […]
Lecroy LT342 Repairs
I managed to get a cheap “for parts” oscilloscope that arrived with a dark screen, damaged CH1 BNC connector and broken ground terminal. One knob was missing and the floppy drive did not work. The encoders where hard to use, very erratic. You turned them fast and nothing moved and you turned them slowly and […]
HP 8920A LCD conversion
The 8920A Radio Communications Test Set is a wonderful instrument but it has a terrible CRT display. The screen surface is very light and, unless you are in a dark room, it leaves little room for contrast when something appears on the display. I have been avoiding using it because the display was difficult to […]
HP 6632B OLED display
The HP 6632B is a very nice power supply and it can be had cheap but since it is now quite old the VFD display will very probably have a few segments severly worn-out which makes reading it difficult. Finding a replacement VFD for a reasonable amount is not possible, I believe HP replaced the […]
HP 8753ES LED Backlight
The 8753ES VNA is a wonderful instrument, but it has many years on its back, and you may find yourself with a barely readable screen due to poor backlight. I have a dedicated article on converting to LED backlight the Sharp LCD module that Agilent used in the 8753ES (Sharp LQ084V1DG21). But in this one, […]
HP 70004A Repair
I bought this cheap 70004A color display as faulty. I was happy to find it actually worked… or so it did for a few months. One day, it refused to turn on. I could see the power LED flash briefly upon turn-on and then… silence (pretty easy to tell with your eyes closed if this […]