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

[Stan W1LE]

Hello Ed,

E26   IF attenuators no calibrated.   Not calibrated for Correct Measurement

SP33.0 in the HP8970A: 
Perform IF attenuator calibration. Refer to the Calibration, IF 
Attenuators Detailed Operating instruction
See page 3-47 of the HP8970A manual.

General Remedy: Repeat Calibration.

If the IF Attenuator Calibration is not successfully completed, error 
E13 is displayed,
with 4 dashes in the NF window

What is the condition of the memory backup battery ?
If it has depleted, prior IF attenuator calibration memory will be lost
and possibly a E80, memory failure, will occur.

What is the result of entering the ENR cal data into memory and 
calibrating  ?

Did the noise source work before ? 

Do you have detailed current ENR vs frequency calibration data ?

The biggest problem with old units is the internal battery depletes.

Stan, W1LE   Cape Cod



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
>
>
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