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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One kind person my kind regards presented me with thin copper foil with adhesive layer. This was required to enable trimpot RP1 setting for both negative and positive gate voltage.

Don’t have an account? Since all microchips in HP A are in thru-hole type DIP style, all replaced components are carefully desoldered and positions on the board populated with high-quality collet-type sockets. manuak

File:HP 3457A operating manual.pdf

Base range, which is 3. We sincerely promise to do better next time. Outguard earth-referenced domain contains of: R trimpot adjutment for offset correction. Important feature, mankal from previous A, is ability to select front or rear terminal input by remote GPIB command. Replacement foil resistors S After Q replacement with faster curve than original and U more gain input amplifier circuitry started to oscillate with frequency around kHz.


Now disconnect one of grounding wires, that connect top shield screen to bottom.

File:HP A operating – Hive13 Wiki

Electronic input terminal switching Image Frequency Counter Performance Tests RMS deviation was calculated, in ppm scale from the average. Ac Voltage Performance Tests This means that disassembly and cover removals not required for adjustment and calibration with few exceptions, covered later.

Preparation For Use HP A front face. Many of inteface and overall design ideas in this meter are used as a base mxnual later HP A monsters.

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. Dc Current Offset Calibration Now turn the meter again, front panel facing to us, remove top plastic cover and under it we can find top shield, holder of the multiplexer board.

Disconnect everything from the meter, including mains, GPIB and input cables. Often modification result was negative performance got worseso reverse modification was required to determine what went wrong. That makes possibility of rear back-light impossible. Sounds too good to be true?


3457A Digital Multimeter

Perhaps because of this note in service manual typical calibration in the service shops does not include this calibration either.

Redistributions of article must retain the above copyright notice, this list of conditions, link to this page https: Details and modifications were tested on actual single HP A unit, and may or may not work in your particular instrument. Changing The Security Code As result of such complex arrangement A front-end does have more input noise compared to A, and also does not have 1: Final test data rainbow with all tested FET s: Hp3547a are listed below: Dc Volts Gain Calibration Urge to attach something generating light to aid readout visibility is very hard to resist.

Also each function and mode can be configured either from front panel or remotely over GPIB interface.