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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If you would like to support us by making a donation please click the Paypal button: Hmm, hold on a moment? HP 3457q can also use optional expansion card with multiplexer scanner, to add up to 10 channels for input signals. But that was all the tweaking required!
The A combines superb analog measuring capability with equally powerful measurement management. Check the table below with uncertainty calculations.
3457A Digital Multimeter
This stable 2V level supplied to voltage-current converter around Ua,Q with current setting by resistor R The item may have some signs of cosmetic wear, but is fully operational and functions as intended. Carefully insert isolated flat screwdriver to fit the pot port.
Read more about the condition. 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. Likely, largest contributors to h; performance are C Q U U Suspects are listed below:. Either one of three different optional assemblies may be used with the A for different measurement capabilities.
Sampling rate was equal to 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? Reading the full details the 3547a is even more impressive. Learn More – opens in a new window or tab. Unable to Process Offer Your offer was received but we are unable to process it for the following reason: Low ranges like 0.
HP A overview Image 2: COTO relay for front end. View Cart My Account. Original reference schematics Hmm, hold 3457z a moment?
Add to watch list. I did not want to risk full disassembly, due to risk of killing the only working display.
| Tweaks and mods for HP A digit DMM
Additional Info Please let us know any information that will help us fill your requirement such as urgency, quantity needed, etc. Perhaps because of this note in service manual typical calibration in the service shops does not include this calibration either.
Reference voltage source is same module from A, using LM ovenized buried zener circuit. Note that A conversion from ADC is actually 7 digits, but least digit is averaged out and not reported to the front-end, nor the GPIB port remote controller.
This is little tricky.
Agilent / HP A for sale $ | | AccuSource Electronics
This item may be a floor model or store return that has been used. Closest to the base range is 3 V, which is not best case for sensitive measurements, such as 7V reference output. 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. Modifications worklog Some might think that HP A is ancient technology instrument, and it should be very easy just to swap some opamps and components to modern high-performance devices, and everything will become much better.
HP Journal archive, issue February. Also as bonus HP promoted ability to get 7th digit from special register access. Areas np A have worse spec marked in red color.
Free Local Pickup See details. Description Included Accessories Available Options 6. Modifications for A input amplifier. Interesting stuff and very nicely executed! It is interesting to see the different solutions that are made to the same nuisance. Electronic input terminal switching. It would be interesting to see if the changes in power consumption, heat, or electrical noise changed the calibration.
This information is displayed on the screen and operator is expected to adjust R for best result. For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab.
Redistribution and use of this article 3457q any images or files referenced in it, in source 357a binary forms, with or without modification, are permitted provided that the following conditions are met:. In fact, there are several mods already out there that simply add a backlight.
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