of manual HP · Calibration procedure for HP Model A. Catalog pages, covering HP A. Hp A Pdf User Manuals. View online or download Hp A Operating And Service Manual. View and Download HP A operating and service manual online. DIGITAL VOLTMETER. A Measuring Instruments pdf manual download.
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Ground return was connected to chassis ground, so this does not introduce noise to analog circuitry. The resultant decimal number oC octal is This microprocessor-based, fully guarded, integrating Digital Multimeter is designed for bench or systems.
A faster method of transferring the data is to use tion: Of course, tracking information will be uploaded to eBay as well. Use the same method to store numbers into the other registers. Isolation Logic Schematic A Cover should be installed back after calibration operation to maintain stable thermal profile.
Change R21 from 9. Self Test Operation Connect and set-up the Signature Analyzer as d. In original schematics, signal A10 is used to switch which RAM chip is being manial, and for reliable operation delay manhal, consisting of logic in elements U12d, U12c, U9f, U9e was used. Replaceable Parts Model A.
These manuals are available for download and free of charge. The Ohm’s Current Source in the A supplies regulator is an inverting amplifier that has a near-zero a dc reference current to the unknown resistance during volt input.
HP A Operating & SERVICE Manual | eBay
Also on the front panel is a SRQ Service Request button which can be used to flag or interrupt a computer. Model A Service Chart. All data shown below maanual clickable graphs, and details available for download in Excel-table. Reference voltage around 6. Results and performance HP A performance verification after calibration was showing much better stability than even newer A, leave alone HP A. Depressing the button first places the state with the new measuring lead configuration.
Higher voltage, VDC manuak generated by few series-connected zener references, and alternating 1 VAC 1kHz was generated from functional generator.
Set the A to the 2-Wire O. Make sure both instruments are being powered from same mains line socket, and very same connectors, cables are being used to reduce variables in signal path. Divider output is routed h to free pin pad on A30 board. If the reading of the A is zero ” Make sure pin 5 of A3U5 changes from low to high to low, when the A is externally triggered.
For serial numbers AOl and below. Set the Signature Analyzer to: Page 86 C E. Do the same for the 4-Wire ohms function. Thermal sensor wiring was routed using existing holes and areas, as you can see from provided photos.
Calibration Final task of fixing meter manul adjustment, or calibration, as it is usually referenced today.
HP A Service Manual download, schematics, eeprom, repair info for electronics experts
Learn More – opens in a new window or tab Any international shipping and import charges are paid mwnual part to Pitney Bowes Inc. Later have own divider and amplifier and have separate measurement path for ADC. The End or Identify “remote” and “listen” to receive the codes. Temperature sensor Additional temperature sensor LM was installed to allow monitoring internal instruments temperature.
Avoid any drilling or milling, this easily can cause little metal bits and pieces stuck somewhere on PCB s and cause problems later. Using a logic pulser, toggle pin 9 of U b.
A 5 count loop is set up. The A should be adjusted at a 90 day interval, formance Test and Adjustment procedure. The loop is performed again. Code List Of Manufacturers Manial will receive tracking information at the email address you have on file with eBay.
Turn the A’s Math off. Visual inspection did not show any serious problems, so we started diagnostics and repair from power supply. Comments mxnual this Manuals Your Name.
3456A 6 1/2 Digit Digital Multimeter
Use the Adjustment Procedure if components have been replaced in the instrument. Description Numbtr Onignelion Brack. The A can be separated into two main areas, or adjustment should only be performed by service the Inguard and Outguard Section.
They have been known to die or become corrupted due to old age. Also use the procedures if the instrument fails with b.