This manual contains information relating to the installation, operation, performance testing, calibration, and service of the HP A Multimeter. The information. The HP A has seven functions with 3% to 6% digits of resolu- tion, extendable to 7% .. (). Opt Extra Operating and Service Manual. +$ Hp A Pdf User Manuals. View online or download Hp A Operating Instructions Manual, Service Manual.

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Also this unit has least weight in class, due to use of plastic instead of metal as covers material.

Redistributions of files in binary form must reproduce the above copyright notice, this list of conditions, link to this page https: HP A rear view on modified screen. This allows to experiment easy without risk of damaging the board taking everything apart for each component swap. U hybrid design block diagram.

Input amplifier ready for testing. HP Journal archive, issue February. Electronic input terminal switching.


Rear Terminal Offset Test To be fair, contrast of this LCD got bit worse, but readings are still clearly visible. More details presented below. HP A rear view on modified screen Result at night. HP A input amplifier after all modifications.

Preparation For Use Even with shorted input, when reference noise irrelevant to ADC! RMS noise data measurements Note, that on low voltage ranges 0.

Different non-modified HP A performance test, as returned after calibration adjustment, 4-wire resistance.

Sampling rate was equal to 0. Vos adjustment trimmer access port in shield cover. I used middle sweet spot device for replacement Q I did not want to wait, so adapter board bodge to the rescue to fit two chips in DIP 8 socket.

Ac Voltage Function I had no problems with self-test, as I had calibrated the balance during initial repairs and troubleshooting in meter, before any modifications. Rear Lnput Performance Tests standard Instrument Table below present measured data after calibration adjustment and performance verification. Pair Q and operation of this stage usually higher working current produce less noise. Inguard isolated section has next circuits: 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.


HP 3457A Manuals

Backlight boards with LED diodes installed on mount frame to position light for the edge of display glass. Special circuitry protects calibration data from unauthorized or random overwrite.

Redistribution and use of this hhp3457a or any images or files referenced in it, in source and binary forms, with or without modification, are permitted provided that the following conditions are met:. On alternating voltage, A is much weaker than older A.

File:HP A operating – Hive13 Wiki

Additional temperature sensor and output BNC port for it. Input amplifier after my modifications. HP A with hp3475a installed.

In no event shall the author, xDevs.