Transfer standard performance is assured with the HP A. Best accuracy is 0. Crest factor is greater than seven at full scale. Also on the front panel is a SRQ Service Request button which can be used to flag or interrupt a computer.

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Zulkitilar Calibration sources and standards required are much less than amount of available ranges. Modifications Right after repair and initial checks, instrument was modified — installed temperature sensor, improved thermal and air insulation around voltage reference zener, and later whole reference module was replaced with DIY triple LMbased module. First two models ,HP A and HP A sometimes can be found for very low prices on secondary markets, providing bargain entry into high-resolution gear for beginners and students.

Manial 15 through 1 1 are 0 I 0 0 0 respectively and clock input for A4U20D one-shot multi vibrator. After repair there are some extra modifications described and tested, to gain performance improvement on this multimeter. Page Turn the A On. This is done for two reasons: Covers replacement Missing outer cover was purchased on eBay, and inner shields were DIY manufactured. California orders will be subject to 9. This can be done by b.

Page Manual must be followed. U17 and U19 on A4 were replaced, but meter was still doing same thing. Use nection as hp in Figure This data is tional circuit details regarding the Autozero and Analog expanded from 4 line-input PT11 is load enable line to Filter circuits.

Other offers may also be available. Select a valid country. View Cart My Account. If a math feature is selected, the math calculation is done before the recalculated reading is displayed.

Model A Service are in parallel to minimize the input resistance. Page of Go. No additional import charges at uses Cover should be installed back after calibration operation to maintain stable thermal profile. I f the V and V Ranges are noisy, set the 2.

If a short is noted, replace the defective If no shorts are noted, replace U 1 7. This item will be shipped through the Global Shipping Program and includes international tracking. Description Numbtr Onignelion Brack.

For DC voltage sources of stable 0. The Statistics math feature of the -hp- Model with the present reading X displayed on the front A is used to make a Mean and Variance calculation panel. This type of rms Table of Contents Add to my manuals Add. HPA noise levels was within 0. Schematics of triple zener reference is shown below: Page Backdating Model A j. However, Buyer shall pay userz shipping charges, duties, and taxes for products returned to -hp- from another country.


3458A Digital Multimeter, 8 ½ Digit



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HP 3456A Operating And Service Manual




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