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really not up to the task
B&K Precision has been around a long time, and they provide some good products, and some that are less good. This is less good. (Software ver 1.1, for reference. Purchased mid 2021, but originally delivered in 2016 to the first owner, by the supplied paperwork. May have been old stock)
As a meter, it works. The unit I purchased was used, but it still meets the specifications for accuracy for all functions and ranges except resistance, where it is slightly out of spec. Not surprising given the unit is several years old. It isn't an HP, after all, and the price isn't either. If all I cared about was basic standalone use, this would be fine. The speed is ok, it has good averaging options (running average over a queue of n, or acquire n and average), and the math functions I have tried do their job. I haven't checked the statistics results, and there have been reported issues there. The front panel connectors are ok and the control buttons responsive.
But the selling point to me was the RS-232/USB connectivity. (WINDOWS ONLY USB driver is in the B&K site. It is an RS-232 to USB bridge providing a virtual serial port to a windows machine) Here, it fails miserably. The manual clearly states that there is no handshaking for the communication, but that the echo option serves the same purpose. Check for character echo, and if it isn't, then resend. Unfortunately, the first character sent when the meter isn't ready- the first not echoed- triggers an error state on the meter. This abandons the operation in process, at least some of the time, and has unspecified time to resolve. It also leave the meter in an unspecified state, sometimes leading to the subsequent valid command triggering an error, or being outright ignored. The SCPI implementation is, as documented, minimal and not to the spec (no exception tree, for example) but the actual behaviour of the meter does not match the documentation. For example, init triggers readback of the reading, without a fetch?. The following fetch? gives no response. This occurs when storing to the buffer, as well. The B&K provided software has problems, and on several computers worked the first start after install, and would never sync again, either failing to acquire the port or failing to synch leaving the meter in a recurring error cycle. The software for the 5491A DID work, but doesn't do the graph or store data sets.
The front panel menu is buggy, sometimes displaying incorrect options. It will also display random text during normal operation when on remote.
The VFD is Quite readable, with large, bright characters. I'd class it as at least as good as the 14 and 16 segment Agilent meters when new (34401A for example), and the characters are larger. Turning off display doesn't power it down (saving operating hours for the VFD) but only stops updates. The meter operates faster this way, but the main benefit is lost.
The meter does not have documentation for field calibration, and the cal menu is locked out. Yes, I have tried all 10^4 codes, and none unlock it. None do. (about 3 six packs over a week to try them all. It isn't an exciting time)
My particular unit will not read the lowest range for 4-wire resistance (100ohm), though is fine on all others and reads fine on the 2-wire 100ohm range. I have not opened the unit to debug, but would guess this is a repairable hardware issue.
The B&K tech support has been helpful, as has been my experience with other of their products, even those several decade old, but they can't fix poor design. B&K doesn't manufacture this, or the replacement, but spec it from another manufacturer. The list price was around $700US (depending on when). I took a chance at a much lower price, and would not again for even less.Vollständige Rezension lesen
Bestätigter Kauf: Ja • Artikelzustand: gebraucht • Verkauft von: electronicspart...
The unit seems to be working fine, checking AC and DC voltage, AC current, and resistance. Thanks!
The unit seems to be working fine, checking AC and DC voltage, AC current, and resistance.
Thanks!
Bestätigter Kauf: Ja • Artikelzustand: gebraucht • Verkauft von: ndlw928
Folding carry handle. Excellent condition for being used. Came with Probes.
About the same size as my Fluke 8840A DMM.
Bestätigter Kauf: Ja • Artikelzustand: gebraucht • Verkauft von: paragonnt