Archive for the ‘Teardowns’ Category.

EDC/Krohn-Hite MV216A DC Voltage Standard Teardown and Tempco Measurement

In this blog post, we are going to take a look at Electronic Development Corporation’s (EDC, acquired by Krohn-Hite in 1998) MV216A battery/external powered DC voltage standard and also measure its voltage reference’s temperature coefficient (tempco). A teardown video is also included towards the end. MV216A is a six decade precision DC voltage standard, it can output from 0.1µV in 100mV range all the way up to 11.1111V in 10V range. Voltage standards of this caliber are usually used as calibrators to calibrate multimeters and other test instruments. Continue reading ‘EDC/Krohn-Hite MV216A DC Voltage Standard Teardown and Tempco Measurement’ »

Keithley 706 Scanner Teardown

I bought this Keithley 706 scanner on eBay a while ago. This scanner can take up to ten different scanner cards and is typically used in an automated testing environment. In this blog post, I will show some of the teardown pictures and a couple of the scanner cards (7064, 7152) included in this unit. A quick teardown video is included towards the end. Continue reading ‘Keithley 706 Scanner Teardown’ »

Teardown of a Cisco CSS 11503 Content Services Switch

This old Cisco switch was on its way to the dumpster at my work place, so I thought I would rescue it. After all, while there are plenty of teardowns of consumer grade networking gear on the internet, teardowns of enterprise level network equipment have been hard to come by. So at the very least it would be a good opportunity to take a good peek inside. Continue reading ‘Teardown of a Cisco CSS 11503 Content Services Switch’ »

Wavetek 859 50 MHz Pulse Generator Teardown

In this blog post, let us take a look at a Wavetek 859 50 Mhz pulse generator. This pulse generator was made back in the 1980’s and has long been obsolete since. I got this unit next to nothing as it was not working and I was told that multiple boards might have failed. Even though it might not be repairable, we can still learn quite a bit from a teardown. If you just wanted to watch the teardown video instead of reading through the post, you can scroll down to the bottom. Continue reading ‘Wavetek 859 50 MHz Pulse Generator Teardown’ »

Amrel PPS-2322 Programmable Power Supply Teardown

I picked up an Amrel PPS-2322 programmable power supply from eBay recently. You probably have not heard of the Amrel brand before as American Reliance (Amrel) no longer makes power supplies nowadays. Its power supply division was acquired by AMETEK Programmable Power, a subdivision of AMETEK back in 2010. While Amrel power supplies had been discontinued, Amrel branded electronic loads are still being actively developed and sold by AMETEK. Continue reading ‘Amrel PPS-2322 Programmable Power Supply Teardown’ »

Keithley 614 Electrometer Teardown

In this blog post, we will take a look inside a 1980 vintage Keithley 614 Electrometer. While it was designed and built more than three decades ago, its performance is still pretty impressive (10 fA current resolution) even compared with today’s modern standards. Its performance was only rivaled by Keithley 617 in its days. Continue reading ‘Keithley 614 Electrometer Teardown’ »

Wavetek 1045 RF Power Meter Teardown

I bought a Wavetek 1045 RF power meter off eBay a few weeks ago. It came with a 13787 detector which is capable of measuring RF power between -50 dBm to 10 dBm with a frequency range of 1 MHz to 18 GHz. Continue reading ‘Wavetek 1045 RF Power Meter Teardown’ »

HP 8642B Teardown Pictures

In my last post, I showed my LED backlight mod of the HP 8642B synthesized signal generator. And during the process, I also showed some pictures of the A1 (keyboard and LCD) module and A2 (modulator) module alone with an intriguing Easter egg message in the firmware. In today’s post, I will do a full teardown of each module and take a closer look at what’s inside. Continue reading ‘HP 8642B Teardown Pictures’ »

Wavetek 907 Repair, YIG Oscillator Teardown

As I mentioned in my previous posting, there was an issue with my Wavetek 907 microwave frequency generator. While everything was fine during my initial testing, the frequency display is now stuck with an out-of-range display and the adjustable frequency range is limited to between around 6.9 Ghz to 7.9 Ghz (instead of all the way up to 11 Ghz). My initial suspicion was that the PTC heater inside the YIGGunn oscillator was malfunctioning. But as it turned out, it was something else. Continue reading ‘Wavetek 907 Repair, YIG Oscillator Teardown’ »

Wavetek 907 Signal Generator Teardown

Since I just got myself an HP 5350B microwave counter and I had fixed it up, I thought it would be great if I could get a SHF generator to test out the counter in the microwave range. So when I saw a super cheap Wavetek 907 for sale on eBay, I simply could not pass it up. Continue reading ‘Wavetek 907 Signal Generator Teardown’ »

MF 10A Analog Multimeter Teardown

Dave did an analog multimeter teardown in his latest episode. I have a Chinese made MF 10A multimeter bought back in the 90’s and thought I’d do a teardown to take a look at what is inside. Continue reading ‘MF 10A Analog Multimeter Teardown’ »

Keithley 197 Teardown and Repair

A few days ago, I bought a Keithley 197 sold as “unknown working condition” on the cheap. The seller said that some of the keys on the meter were unresponsive. I figured that I’d try fixing it if I could. After all, these 5 ½ meters still fetch well over $100 on eBay and for a fraction of that price, I was willing to give it a shot. Continue reading ‘Keithley 197 Teardown and Repair’ »

HP 6113A Teardown And Calibration

A couple of weeks ago I did a teardown of HP 6181C — a precision DC current source made in the late 70’s and early 80’s. This time around, I am going to show some pictures of an HP 6113A precision DC power supply and do a basic calibration using my Keithley 196 multimeter. Continue reading ‘HP 6113A Teardown And Calibration’ »

HP 6181C DC Current Source Teardown

HP 6181C is a lab grade 0 to 250 mA current source manufactured back in the late 70’s and early 80’s. There does not seem to be any pictures on the Internet for this particular model so I thought I would do a teardown here. Continue reading ‘HP 6181C DC Current Source Teardown’ »

Tektronix 2213 Teardown Pictures

I love old Tektronix analog oscilloscopes and I could not seem get enough of them. So when I saw a cheap “untested, unknown working condition” Tektronix 2213 listed on eBay recently, I just could not resist the temptation to grab it. Continue reading ‘Tektronix 2213 Teardown Pictures’ »