[Test-Equipment] HP 428b Probe Info

Mon, 12 Apr 2004 05:26:42 -1000

George,
  That probe head has 4 coils in it arranged as a balanced bridge circuit.  
Quoting HP, "The probe head is a specially designed second harmonic 
flux-gate type of magnetometer used to measure the magnetic field around a 
wire carrying direct current."  I think the probability of building one is 
nil.  I have a hunch it was difficult even for HP because why is this the 
only lab-type clamp on DC milliamp meter ever marketed considering its 
usefulness?  If anyone else knows of another enlighten us.  I think it's 
safe to say the probe IS the meter.  Don't buy without one.  I can't recall 
ever seeing just a probe offered on the e-place.

pete

>From: George KB2Z <[email protected]>
>To: "test-equipment-mailman.qth.net" <[email protected]>
>Subject: [Test-Equipment] HP 428b Probe Info
>Date: Fri, 09 Apr 2004 17:01:54 -0400
>
>Good afternoon all,
>I am looking to buy an inexpensive HP 428b clamp on ma meter.
>The only ones I see in my price range never have the probe.
>Would anyone on the list have an inexpensive or surplus probe,
>or a scan of the probe/specs info from the manual?
>Can a probe be built from something like a split or halved, ferrite toroid 
>and a clothespin?
>Thanks in advance, George
>
>
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