Tony,
I would suggest using the clean 10 Hz data and ignore the data with all those
gaps. In a pinch you can make use of irregular data but it's usually such a
pain it's not worth it.
To calculate the peak continuous sample rate you have to include all the
measurement overhead; this would include Hyperterminal as well as the Prologix
itself, not just the documented 5370B timing.
To get a realtime report of measurement rate use my command line comlog.exe
tool (under www.leapsecond.com/tools/) instead of hyperterminal. If your com
port# is 17, the command is:
comlog /quick /ts:i 17,9600 -
This will give you microsecond timings for each read from the serial port.
/tvb
----- Original Message -----
From: "Tony Greene" <[email protected]>
To: <[email protected]>
Sent: Sunday, February 23, 2014 10:25 AM
Subject: [time-nuts] HP5370B Dead Time in TI Mode
> Greetings,
>
> I have run some time interval test and it did not quite calculate correctly.
> I used a TADD2 that is configured for 2 outputs at 100 Hz, 2 outputs at 10
> Hz, and two outputs at 1 PPS. The HP5370B clock output was used as the input
> for the TADD2. The output of the TADD2 was feed to both time interval inputs
> using a tee. I am using a ProLogix GPIB/USB adapter and hyperterminal in
> windows to capture the data. The object of the test was to make a baseline
> noise floor measurement.
>
> The 5370B manual shows there must be a minimum of 330 microseconds between
> measurements. If the unit is put in the time interval binary mode via the
> GPIB, the unit can output up to a 6 Khz rate on measurements. The 5370B
> manual does not state what the instrument can output on the GPIB, in normal
> use (meaning, not in the time interval binary mode - just plain talk mode).
>
> I made some measurements using 100 hz to both inputs and in one hour, the
> data file shows only 51437 samples. This equates to 14.288 samples per
> second.
>
> I made some measurements using 10 Hz to both inputs and in one hour, the data
> file shows 35988 samples. This basically works out to 10 samples per second,
> as expected.
>
> Knowing the results at 100 hertz, how can one tell a program such as Stable32
> or Plotter about the dead time between measurements ? Or would it be best to
> keep the inputs at a maximum rate of 10 PPS, and say thats the limits in the
> normal TI mode ?
>
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