It came at a relatively dirt-cheap price and free shipping and a guarantee. So, it arrived not exactly DOA but not working. I contacted the seller who promptly refunded all of my money and told me to keep the unit. Here is a couple of videos I posted to demo the problem.
|Published (Last):||1 September 2004|
|PDF File Size:||13.94 Mb|
|ePub File Size:||5.11 Mb|
|Price:||Free* [*Free Regsitration Required]|
Daikora The manuals for the hp A are widely available from the Agilent website and other manual down load sites, so we have not re-scanned or re-posted ho here. The first chopper stabilized circuits used a galvanic break of neon bulbs to cadmium sulphide cds photo cells. Skip to main content. Fortunately, we had two suitable replacements on hand and all is well now. Although not a fixed rule, the later models can be generally identified by a white neon bulb front panel power light indicator, the more modern hp logo black and blue silk screen painted on the panel, the black toggle power switch not the metal toggleand a fuse holder with the light grey insert the removable part on the rear panel.
Best Selling in Voltmeters See all. The original 10 MegaOhm input R was provided by a nuvistor vacuum tube in a small metal can RF amplifier. If the description says needle moves and the picture shows a needle indication above the first mark, plan on a high likelihood of repair! Ratings and Reviews Write a review. We hope to earn your business.
Note the wire positions and colors and remove the wire plugs from the gold posts. Discounts may be offered for reduced service levels. Please correct the issue indicated and resubmit or contact us via email or toll free at and we will be happy to assist you with this request.
Error Sending Request We are very sorry but an error on the server is preventing your request from being processed. Yes No Are you willing to prepay your order by check or wire transfer to avoid credit card fees?
I do not know what serial numbers changed over from the nuvistor to the JFET input, or from the neon bulb chopper to the intersil integrated chopper might be in the manual changes somewhere; I think the came out aroundnot sure. Please let us know which of these you would be willing to consider for the price discount. Jim Williams passed away the same Sunday that I was writing my first notes on high crest factor measurements.
True, temperature gradients across a chip can be an issue. Recently, the availability of late model e. Early and mid production models used the traditional numbering scheme A nnnnn. The fear of sockets in uV circuits a in our opinion over-rated. In the process of the repair, we changed out the chopper stabilized amplifier and added a high quality 14 pin socket  In fact, the repaired unit is somewhat more stable less noisy than the working unit, which makes us wonder if due to the improved LTC part?
See also their main gallery. Additional Info Please let us know any information that will help us fill your requirement such as urgency, quantity needed, etc. I concede that by the nV region as noted in the LTC data sheet a socket can be problematic, however by the uVs with no significant air flow in a closed box, socket to pin thermocouples are less of an issue yes, it can depend on the particular metals and pin plating since all of the pins are at the same or a relatively constant temperature.
As well documented, for example, by Jim Williams and Todd Owen of LTC , average responding meters do not directly measure noise correctly. Since then, we have been investigating low cost solutions for low level H; measurements. Correct Issue Close a. Most 10 Related.
HP Agilent Diagrams, Schematics, Service Manuals
What Makes a Better Voltmeter? It was the galvanometer quality which made the difference between a more or less accurate, comfortable, and pleasant to use instrument. The story below describes the technology used by Hewlett Packard to manufacture, in-house, most types of galvanometer that were included in the manufacturing of analog meters. Meter assembler, adjusts the axial position of a moving coil. Instead of pivots and jewels, the moving coil in a taut band meter is suspended on a platinum alloy band-eliminating friction and insuring excellent repeatability.
HP 3400A Operating And Service Manual