Various modifications and circuit improvements of HP A 6½-digit system DMM. This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-. Packard’s former test and measurement, semiconductor products and. HP – A. info tech (non contractuel). HP – Agilent – Keysight A Digital Multimeter HP Agilent A Multimeter, Calibrated with 30 day Warranty.
|Published (Last):||24 April 2005|
|PDF File Size:||19.42 Mb|
|ePub File Size:||6.95 Mb|
|Price:||Free* [*Free Regsitration Required]|
Now we can disconnect everything, assemble parts back and turn on for warming up and final tests, to make sure that meter reports still PASSED after a day or two. Input amplifier ready for testing.
To be fair, contrast of this LCD got bit worse, but readings are still clearly visible. If there is lack of compensation, then amplifier will work normally when input voltage is zero or less then 0. This was accomplished with three spiffy PCBs stacked on top of one another. Wondering, if that is design issue of HP A, or 3457q particular unit trait.
Inner protection shields Image 7: Learn More – opens in a new window or tab. Replacement foil resistors S The power consumption was a bit higher than the previous version, but this was to be expected with the exceptionally brighter display — and well worth it at that. Any international shipping is paid in part to Pitney Bowes Inc.
One solution to this that we have seen before is a hack where someone decided to add a backlight onto their cheap multimeter. Basic DCV accuracy is specified better than 5 ppm. More details presented below. Please let us know which of these you would be willing to consider for the price discount. Reading the full details the hack is even more impressive. Suspects are listed below: Urge to attach something generating light to aid readout visibility is very hard to resist.
Shields locked in place. This item will ship to United Statesbut the seller has not specified shipping options.
HP – A AGILENT multimeter | eBay
Either one of three different optional assemblies may be used with the A for different measurement capabilities. Redistributions of article must retain the above copyright notice, this list of conditions, link to this page https: As result there is no mechanical switch on front panel to change terminal side manually.
Remaining two LED s had current limited by inline resistor, insulated 3457 hidden by thermal-shrink tube. This item may be a floor model or store return that has been used.
LED supply power connections. I really hope that he makes this into a kit. You are commenting using your Facebook account.
Email required Address never made public. DIY voltage-current curve plot detector. To my opinion, this was bit overdue addition, as previous model, A even with official specifications without any tweaks can be more precise and less noisy than A.
I used middle sweet spot device for replacement Q We will notify you as soon as this item is available for purchase. R help to maintain balance when input is shorted, or in other words — cancel out voltage offset. Offer AccuSource Electronics is always happy to consider reasonable offers on our test instruments.
| Tweaks and mods for HP A digit DMM
Note that A conversion from ADC is actually 7 digits, but least digit is averaged out and not reported to the front-end, nor 3457s GPIB port remote controller. After Q replacement with faster curve than original and U more gain input amplifier circuitry started to oscillate with frequency around kHz.
Email to friends Share on Facebook – opens in a new window or tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab Add to watch list. R6 and R14 with their protection 4357a prevent gates from excessive current. HP A can also use optional expansion card with multiplexer scanner, to add up to 10 channels 3457 input signals. That yp each modification test is full reassembly, few hours warmup and then multiple hours for datalogging each low range separately!
See terms – opens in a new window or tab. People who viewed this item also viewed. In addition, these two channels can be used as external device actuator channels.
On an device that can read down to 7. HP A U hybrid. Input amplifier after my modifications. In-Stock Notification Request Sent Your request to be notified when this product is back in stock has been sent to our sales department.
Different non-modified HP A performance test, as returned after calibration adjustment, 4-wire resistance.
3457A Digital Multimeter
Designed so that software written for today’s multimeter will fit tomorrow’s, HPML only asks you to define the parameters necessary to accomplish your measurement. Have you ever been so frustrated hhp a digital display that you wanted to rip the whole thing out and create a better one? This item will be shipped through h; Global Shipping Program and includes international tracking.
That is exactly what [xi] did. Interest will be charged to your account from the purchase date if the balance is not paid in full within 6 months.
Add to watch list Remove from watch list.