OK, using GPIB, I have set up a UDK for NULL, which is good. I have one for MATH OFF. The dB UDK is a little tricky - I can make it convert my readings to dB, but it defaults to a reference of 1 volt so I get dBV. If I do dBm the same happens because the default is a Z=50.
SMATH will allow a different reference to be set, but in my case for dB the reference can be any voltage. I want to read a voltage and call it zero dB for starts. Then when the signal level or frequency is changed I can see the difference. I was thinking a combination of dB and null would do it, like you can using the HP 34401A.
Not quite sure yet, but there may be a way to have a UDK to take a reading, store it in a register, then use SMATH to recall that value as the ref and MATH DB to convert subsequent readings to dB bases on the stored value. Hopefully all this without writing software.
Steve
From: Frank Stellmach frank.stellmach@freenet.de
To: volt-nuts@febo.com
Sent: Thursday, April 23, 2015 3:27 PM
Subject: [volt-nuts] HP 3458A user-defined keys
Hi Steve,
according to the manual, DEFKEY is also accessible from the front panel.
I assume, you may just assign the wanted functions by accessing the
normal command menu, after entering "DEFKEY x,"
Anyhow, programming the keys via GPIB is much more handy..
Frank
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OK, using GPIB, I have set up a UDK for NULL, which is good. I have one for MATH OFF. The dB UDK is a little tricky - I can make it convert my readings to dB, but it defaults to a reference of 1 volt so I get dBV. If I do dBm the same happens because the default is a Z=50.
SMATH will allow a different reference to be set, but in my case for dB the reference can be any voltage. I want to read a voltage and call it zero dB for starts. Then when the signal level or frequency is changed I can see the difference. I was thinking a combination of dB and null would do it, like you can using the HP 34401A.
Not quite sure yet, but there may be a way to have a UDK to take a reading, store it in a register, then use SMATH to recall that value as the ref and MATH DB to convert subsequent readings to dB bases on the stored value. Hopefully all this without writing software.
Steve
From: Frank Stellmach <frank.stellmach@freenet.de>
To: volt-nuts@febo.com
Sent: Thursday, April 23, 2015 3:27 PM
Subject: [volt-nuts] HP 3458A user-defined keys
Hi Steve,
according to the manual, DEFKEY is also accessible from the front panel.
I assume, you may just assign the wanted functions by accessing the
normal command menu, after entering "DEFKEY x,"
Anyhow, programming the keys via GPIB is much more handy..
Frank
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