[Test-Equipment] Need help on HP-8970A

[Ed White WA3BZT]

Hi Gang:
Well got the Noise figure meter and head working great
Here is what happen.
In shipping the button batter came loose (did not fall out but just 
loose but still in place when I turned it on) this allowed it to loose 
the calibrate info stored in memory. So E 26 is a possible dead button 
battery or loose button battery.  Second after the E 26 failure I did a 
33 SF and it would not calibrate this was due to the fact the Noise Com 
NC3108 was not able to do the calibration. Tried another head and it did 
the Cal.  all working great. I then used the NC3108 and it works great. 
So if you have this problem like I had ( see below) try using another 
noise head.
Final outcome "not all noise heads are able to preform the 33 SF"
Hope this helps others that have this problem.
Ed
WA3BZT


Ed White WA3BZT wrote:
> Hi Gang:
> Need help to figure out what is going on with a HP-8970A Noise Figure 
> Meter and Noise head
> When I turn on the meter with the head connected to the input and 
> power I see the following
> All lights lite test
> 4 dashes then E 26
> I then key in 33.0 and press the  Special function
> I get 4 dashes then E 13
> The noise head is a Noise Com NC3108 (opt 4 [ 28 VDC])
> What do I need to do to fix this problem
> The unit worked before I received it (Trusted friend) and we are 
> wondering if something happen in shipping. I have looked at all the 
> boards nothing out of place everything seams to be there.
>
> Any help for the users of the noise meter will be a great help
> Ed
> WA3BZT
>
>