Re: [volt-nuts] HP-3458A NVRAM

Actually, it could make a difference depending on when the processor tries to access the memory on start up. The Maxim app note mentions that many legacy programs designed for the DS1220Y may not work with the DS122AD, hence the reason for the question. I really would like to hear from someone

[volt-nuts] Unable to zero 3420B on 10**5 sensitivity

The first step of the calibration instructions 5-38 a) ask me to select the 1V range, and x10**5 sensitivity and to zero the meter using the front panel zero pot. I couldn't get that to zero. The next step which was to zero at x1 sensitivity using A4R16 works just fine. I checked and replaced

Re: [volt-nuts] HP-3458A NVRAM

In message , Randy Evans writes: >Does anyone know if the DS1220AD will work as a direct replacement for >the DS1220Y >NVRAM chip currently installed in the HP-3458A? There is a timing >difference between the two

[volt-nuts] HP-3458A NVRAM

Does anyone know if the DS1220AD will work as a direct replacement for the DS1220Y NVRAM chip currently installed in the HP-3458A? There is a timing difference between the two devices, as explained in Maxim AN 202. "the "Y" parts had a reset timeout on the order of milliseconds while the "AD"

Re: [volt-nuts] Prema 6048 Cal switch confusion

An aside: The 27C256 EPROMS in these meters are specific to each individual meter as they hold the factory calibration constants for that specific meter in EPROM (i.e. not generic calibration values). That's why the sticky labels over the EPROM window have the meter serial number written on

Re: [volt-nuts] Prema 6048 Cal switch confusion

Just to follow up on this thread ... I received an M48Z02-150PC1 NVRAM in the post yesterday. I installed into the meter set to "Cal" and powered on - thus loading default constants into it. I then read this NVRAM and compared to what I had previously read from the DS1220Y. VERY similar with