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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HP A original Q matching. Rear Terminal Assembly Removal HP A input amplifier after all modifications Image 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.

Reference voltage source is same module from A, using LM ovenized buried zener circuit. LCD display removed from assembly.

Carefully lift rear side of the shield, disconnect hp34557a from rear terminal and turn screen up.

Options And Accessories Data from specs for 24 hour and 90 day period manusl used. There is no service manual schematics for this module in A documents, but such schematics available in A. Calibration hp345a performance verification This section is added by xDevs.


Experimentally, I figured out that there is indeed balance offset. That mean each modification test is full reassembly, few hours warmup and then multiple hours for datalogging each low range separately!


Offset Test Limits Inner protection shields Image 7: I tried to combine modifications in groups, so can test multiple things at same time, when that was possible. Wondering, if that is design issue of HP A, or simply particular unit trait. Inguard isolated section has next circuits: This was required to enable trimpot RP1 setting for both negative and positive gate voltage.

Last calibration date or history of the unit is unknown.

Table below present measured data after calibration adjustment and performance verification. Front Panel Inputs I used middle sweet spot device for replacement Q Calibrated vs same Fluke A on January 21, Yes, it also does mean that calibration will be lost if meter too old and battery discharged.

File:HP A operating – Hive13 Wiki

Redistributions of files in binary form must reproduce the above copyright notice, this list of conditions, link to this page https: Measurement noise data plots Few practical notes about modifications After Q replacement the complete input amplifier balance had to be adjusted and re-calibrated. HP A with shields installed. Dc Current Performance Tests COTO relay for front end Image This opamp provide most of the gain. This is 48 hours of running time, to ensure that short-term stability of the meter is taken into account.


Connect mains power cable back to meter, turn it on and leave it to warm-up for at least an hour. Often modification result was negative performance got worseso reverse modification was required to determine what went wrong.

File:HP 3457A operating manual.pdf

Ac Convertor a3 Assembly Removal One kind person my kind regards presented me with thin copper foil with adhesive layer. This means that disassembly and cover removals not required for adjustment and calibration with few exceptions, covered later.

Electronic input terminal switching Image Hmm, hold on a moment?