| Products > Test Equipment |
| HP 973A & 974A Multimeter Service Manual anyone? |
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| CatalinaWOW:
I can't speak to how either of the companies involved made their decisions about document retention, but I have encountered a phenomenon that definitely affects publicly held companies in the US. Product liability lawsuits are a real thing. And deleting documents relative to a pending lawsuit is obstruction of justice. So lawyers at some companies have recommended that ALL documentation be destroyed after a fixed period. If the documents don't exist they can't be used against you, and if it is a general policy not aimed at a specific lawsuit it is difficult to prove that the intent is obstruction rather than just eliminating storage costs or other valid reason. The recommended fixed interval varies but I have seen numbers ranging from 5 years to 25 years. One more thing to thank our legal system for. I am a firm subscriber to the observation that 99.3% of lawyers spoil it for the whole profession. |
| AMR Labs:
Speaking of lawyers... Another thing that I was wondering about is why did HP not disclose any technical information on these rebranded Yokogawa DMM series during the period when a lot of other documentation of older discontinued equipment was being made public by HP themselves. After all this was a product sold in the US with a HP badge. Maybe HP never even got to see schematics or service manuals at all, or they where only provided by Yokogawa with a convenient NDA in place. |
| dseyst:
I have a 974a also. You can find a user/calibration manual at xdevs.com but I haven't been able to find the schematics yet. Yokogawa made a 7544 02 model which is very similar to the 974a. There is one 7544 02 for sale on ebay right now but the asking price is $199. |
| AMR Labs:
Thanks for the input. However the user manual (or rather leaflet) that includes a very short calibration procedure is widely available from many other sources, if I remeber correctly even from HP themselves. But as you mention unfortunately not so for any service manual or even schematics, hence the reason for this post. I tried searching on ebay for "yokogawa 7544" but nothing relevant came up, even by adding the last "02" to the model. Can you provide a link or ebay item number? Out of curiosity I would like to compare it with the 974A. The price you mention seems way out of line to the usual norm, should be more like between $50-100 and that is for the one with the HP badge, complete with yellow holster, test leads etc. I doubt that a Yokogawa even if in good shape "like new" condition will ever sell higher than the HP counterpart, and definitively not at that price level. I have been monitoring ebay for 974A's for the better part of 4 years, passively as of late, as I do not think I will need to buy yet another one but always curious of what will come up next. On the other hand if something really nice out of the ordinary comes up like the last one in pristine like new never used condition in the original box with test leads and at the right price I could simply not pass on it, hence 974A #4. That one now sits in the closet as a back up unit, as I really don't have much more need or space on the bench for it besides the other four. |
| Kosmic:
For reference, this is the Yokogawa 7544 02. Interesting that the accuracy is 0.04% and not 0.05% like the HP 974a. And the features (Averaging and etc) are not exactly the same. |
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