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"Waiting for Clean Sweep" on HP8722A Network Analyzer?

Hi,

 

I am trying to get the frequency list from my HP8722A Network Analyzer (in order to use it later to put together a .s2p file. The 8722A doesn't handle that format because it's too old).

The way it behaves has me extremely confused right now.

 

If I run my program right after power up, it runs fine, I get the freq list as expected.

 

If I first recall a calibration state then run my program, the 8722A displays "WAITING FOR CLEAN SWEEP" and won't respond to anything else.

 

However, if after loading the Cal state, I manually send the same commands, one after another, I get the expected freq list.

 

As you can see from the attached VI, the commands are

'star 200 mhz;stop 38000 mhz;poin 401'

'outpliml'

 

I am very perplexed. Can anybody help me out?

Thank you very much,

 

Nicolas

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