Various modifications and circuit improvements of HP A 6½-digit system DMM. This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-. Packard’s former test and measurement, semiconductor products and. HP – A. info tech (non contractuel). HP – Agilent – Keysight A Digital Multimeter HP Agilent A Multimeter, Calibrated with 30 day Warranty.
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Equipment Offer Sent Your offer has been sent to our sales department for review. A lot of the older Fluke x meters had LCD failures.
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. Subject to credit approval. Each channel can switch up to V.
And calibration of that meter is very expensive, to let such mistakes pass by. R6 and R14 with their protection diodes prevent gates from excessive current. HP A with shields installed. COTO relay for front end. Add to watch list Remove from watch list.
Diodes CR, CR ensure operation of the current mirror with their voltage drop. Linear power regulator and optoisolation interface between the domains. So I got idea to prevent running this procedure for intermediate testing.
Here is composite integrator Q,U with integrating capacitor C and hpp for comparator circuit U,R,R It was common problem in other instrument HP Areading incorrect resistances when connections were loose.
LEDs Give HP A DDM’s LCD Display the Boot | Hackaday
HP A overview Image 2: Inguard shield removed, revealed AC and front end main board. Leave a Reply Cancel reply Enter your comment here HP A input frontend and signal conditioning schematics Image Often modification result was negative performance got worseso reverse modification was required to determine what went wrong.
Email to friends Share 3457x Facebook – opens in a new window or tab Share on Twitter – opens in a new window jp tab Share on Pinterest – opens in a new window or tab. Upgrades and modifications on this HP A were attempted for long time, multiple times for period over a year. Notify me when back in stock.
Agilent / HP 3457A
This is not a mistake, but a design approach of the A. This is little tricky. Table below present measured data after calibration adjustment and performance verification. Seller assumes all responsibility for this listing.
The item may have some signs of cosmetic wear, but is fully operational and functions as intended. Replaced opamps with collet sockets. Using the high voltage assembly allows single channel measurement of either AC or DC voltages at 3457w rear panel.
Additional Info Up provide any additional information which could help us determine whether we can meet your requirements for this offer. On an device that can read down to 7. See terms – opens in a new window or tab. Refer to eBay Return policy for more details.
This is good, even though not as impressive as HP A tweaking. I did not want to wait, so adapter board bodge to the rescue to fit two chips in DIP 8 socket.
Agilent / HP A for sale $ | | AccuSource Electronics
Report item – opens in a new window or tab. Cost of maintenance on these meters is reachable even for hobby users to use a lab working tool. LED supply power connections Current-limiting resistors are mounted on additional board h the board with four LED s. Modifications log Thermal sensor and mounting location: Carefully insert isolated flat screwdriver to fit the pot port. Weak contacts should be tighten carefully, but not too much.
Get the item you ordered or get your money back. Also calibration commands protected by password, which can be configured by user following special procedure. Reading the full details the hack is even more impressive.
3457A Digital Multimeter
Last calibration date or history of the unit is unknown. Data from specs for 24 hour and 90 day period was used. Yes No Are you willing to prepay your order by check or wire bp to avoid credit card fees?
If you would like to support us by making a donation please click the Paypal button: Learn More – opens in a new window or tab. The power of total electronic calibration, including AC volts, makes it easy to maintain instrument performance. Now we have access to test holes, which marked as Vos Adj A2-R