There is a 2. Some useful information about calibration procedure can be found here. This means we will not be doing expensive boards swap unless absolutely unavoidable. Hp A Manual Pdf You might get the hint here, right?

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Vulabar Get the item you ordered or get your money back. The tightest ratio tolerance is approximately 0. You are covered by the eBay Money Back Guarantee if you receive an item that is not as described in the listing.

The condition of the gpa is good with light wear. There is a 2. This board was missing, so I had to buy replacement manuql secondary market. Except missing A9 DCV reference board, everything is there, no missing parts on boards. Thanks Colby for firmware dumps. Dirty and nasty, but not hopeless. Calculate Varies based on location and shipping method.

Learn More — opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Installation note for covers this operation in detail. Add to watch list Remove from watch list. These handle input terminals switching and range function selection. I have bought Mmanual replacement before, just in case, so it could come handy.

Normally functioning circuit with opamp cannot have such huge offset mV! Hp A Manual Pdf Today electronics test instrumentation part become further split and is known by brand Keysight Technologies.

Now install new FRAM adapters into meter, check correct orientation. After swap receivers with external trigger link, main isolation link working now without any problem. Learn more — opens in a new window or tab. I did also ACAL and it passed without problems. If you change the oven temperature, you will lose the 10V calibration, as the LTZ A will change its reference voltage. For additional information, see the Global Shipping Program terms and conditions — opens in a new window or tab.

Replaced manaul one by desoldering with solder wick and thorough cleaning board with isopropyl alcohol. Meter started to throw RAM errors… Gotcha! Auto calibration increases the gain stability to greater than 0. Inguard power supply board, top and bottom view.

Journal sourced from HP Labs journal archive. Board is redesign to reuse modern components but fully compatible firmware-wise. Inguard isolation interface block-diagram. Temperature coefficient tests Since meter is not mine, and available for limited amount of time, only this test for temperature coefficient of 10V DCV range function was performed. No additional import charges at delivery!

A1 DC board overview. Broken transformer, disassembly attempt. The original A fan filter is no longer available.

Estimated on or before Tue. The replacement fan filter uses three unique parts. Note screws from each board and chassis elements, it will help you later to assemble all back in right order. Learn more — opens in new window or tab. The final requirement of the resistor network is hpq it maintain the ratios of the six slopes throughout the life of HP A.

This item will be shipped through the Global Shipping Program and includes international tracking. Swerlein, Hewlett Packard Co. Related Articles.


HP 3458A Repair Manual

Galkis Refer to eBay Return policy for more details. Sides of chassis after cleaning. This MCU is orderable from Keysight. Firmware update was successful. Often this easy operation can spot obvious failures, such as blown MOSFET s, burnt resistors or missing parts, saving time for further repair. U measurement scope captures. For minimal test meter would need to have boards A4,A5,A6,A3 assembled and properly connected.


HP 3458A Technical Manual

Fenrizshura All these steps are shown in schematics below: HP A is back into good service and owners happy use. Therefore, the ambient temperature has to be limited to max. Cleaning PCB required due electrolyte corrosion and solder mask damage Now I am really glad that we did not cut corners here, and removed them. Few final touches will be done prior to final assembly, but we can work with this.


3458A Digital Multimeter, 8 ½ Digit

Mikaran But since we have nothing better, I will copy this data into new Dallas Mankal so we can use it as starting point. It does seem to be working, at least signal is there. Discussion on repair of this meter Radiokot. Remove mains socket and BNC ports and prepare manuap.



Hope this giving you idea how much it can go as today, even for broken meter with unknown condition, and why is it mxnual. Add to watch list. For additional information, see the Global Shipping Program terms and conditions — opens in a new window or tab. HP digital outguard PCBtop and bottom view Meter digital brain, firmware, calibration ROM and digital interface circuits are located on this dual-layer board. As usual, all photos are clickable for high-resolution version. Be careful with front panel assembly, as vacuum display glass is fragile. Total man-hours spent on this project around hoursgive or take few.

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