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.

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Web-interface for access mirrored on this page. On an device that can read down to 7. All information posted here is hosted just for education purposes and 3457aa AS IS. Calibration procedure for balancing does not adjust anything, it just shorts input amplifier input and measure if the output voltage is in spec, higher or lower than spec.

Input amplifier after my modifications. Learn More – opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. Please enter your offer below for consideration. Electronic input terminal switching. Carefully lift rear side of the shield, disconnect cable from rear terminal and turn screen up. I love the glowing yellow numbers. Wondering, if that is design issue of HP A, or simply particular unit trait.

HP – A AGILENT multimeter | eBay

Item description HP – A. It was the most troublesome, to pick and sort Q FET replacement.


Interesting stuff and very nicely executed! Will arrange for local pickup only no shipping.

Now press 4 and ENT. After completed, a few discrete logic gates were added in the SPI hardware module when retrieving information from the HP to account for the bit vs. Inguard isolated section has next 3457x Shipping cost cannot be calculated. How did that happened? Outguard earth-referenced domain contains of: Learn more – opens in a new window or tab. Now turn the meter again, front panel facing to 3457w, remove top plastic cover and under it we can find top shield, holder of the multiplexer board.

But before that, take h look on the ADC itself. Watch list is full. This means that disassembly and cover removals not required for adjustment and calibration with few exceptions, covered later. Resistance shunts for current measurement function bp high-voltage divider 1: It is interesting to see the different solutions that are made to the same nuisance. If there is lack of compensation, then amplifier will work normally when input voltage is zero or less then 0. Standard accessories supplied by the original manufacturer No manuals or accessories required Other specify Will you accept an instrument with minor cosmetic and physical flaws if it operates properly?

Make sure total height of the component in board is not taller then 12 mm, as there is AC module PCBA above the circuitry here.


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Suspects are listed below: Read more about the condition. This opamp provide most of the gain. Offer AccuSource Electronics is always happy to consider reasonable offers on our test instruments. For 30 V and V additional Sounds too good to be true? Next on the list was to design a casing that would hold the LED display controlled by an ATmega with all of the corresponding parts sandwiched underneath.

The two current channels offer automatic make-before-break switching so that the path for current as high as 1. But that was all the tweaking required! This stable 2V level supplied to voltage-current converter around Ua,Q with current setting by resistor R Learn how your comment data is processed. Grounding wire terminal Carefully lift rear side of the shield, disconnect cable from rear terminal and turn screen up.

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Have one to sell? Please contact us via email or toll free at and we will be happy to assist you with this request. Would love to have this in my Fluke… https: External parts easy to get damaged Can cause unexpected short circuits, or ESD issues running meter in winter with people wearing charged sweaters.