Dear Group,I recently obtained a used HP5370B. Running through the operator checks in the Operating and Service Manual (figure 3-4) it seems to be operating perfectly.
I am trying to use it to compare two 1pps signals - one from a GPS receiver and one derived from a fairly decent 10MHz OCXO. The GPS signal is applied to the start channel and the derived to the stop channel.
As long at there is always a positive or always a negative time difference between the two 1 pps signals the result makes perfect sense. There appears to be about a 2 to 3 usec jitter in the 1pps from the GPS (this is expected given the design of the receiver).
If I put the 5370B in the +/-TI mode I expected to see both + and - small time differences when the two signals are closely aligned - and mainly I do. Typically the difference is + or - a usec or less. Occasionally however the 5370B displays very near to a +1 or -1 second (999.999 xxx ms or -1.000 000 xxx s for example) reading. Needless to say this plays havoc with trying to measure a mean value of the alignment. The 5370B is clearly measuring the "outside" between the pulse pair when I want it measure the "inside" (or short time interval) between the pulse pair.
Is this normal behavior? Is there a setup that I am missing to make it do what I want?
Thanks for any insight you might give me! Best regards, -- Bob Smither, Ph.D. [email protected] ========================================================================== "Liberty means responsibility. That is why most men dread it." - George Bernard Shaw ========================================================================== Circuit Concepts, Inc. 281-331-2744
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