Manual Integrator Supercal 531 06-06-2011 76
(Command ‚l’: parameter flow + tv/tr of the test items), resp. the locally defined test duration (pa-
rameter time).
For all test modes TK/TT/RKS/RTS the corresponding parameters are extracted from the com-
mand ‚r’ in case the test rig PC does not send any CURRENT parameters (‚l’).
Checking of several test points before carrying out the calibration:
Measuring method V (volume): minimum flow distance of the test points: 50% Qnenn
Maximum volume error of the test item: 50%
The following influences have to be taken into consideration when evaluating the precision of the
detected errors or adjustment processes:
Time measurement:
on the basis of the PC-Timer: resolution 833ns, software rounding to 1ms, in general, stability
higher than 100ppm (normal quartz)
Jitter transmission time Nowacom:
This is only important for the time measurement from the beginning to the end of the test (and
thus for the calculation of the current flow).
It is not possible to state an absolute deviation because the duration depends on the driver ver-
sion and the response time of the programme of the test rig.
Maximal empirically detected anomalies are at < 25ms,
typical durations are at 0...4 ms with the combination NowaCom-driver CNOWA V1.01 / test rig
programme CALRPS V4.28.
Meter-specific influences:
Communication times / delays at start / stop, etc., have to be considered individually for each
meter type.
Parameterisation:
For each meter, the parameterisation data are filed in clear-text format in the sub-folder ‚SC531’.
The file extension is ‚.PRM’.
The parameterisation files are structured line by line.
The format is:
‚option = value’.
Example:
Parameterisation file „SC531\PT100.PRM“.
First line: PT = PT100 (possible indication: PT100 or PT500)
Overview of the test sequence volume measurement ‚V’:
NowaStart
Instantaneous values received by test rig
NowaStop
Readout of current ultimate meter volume
Calculation of test volume, interim storage and transmission to the test rig
Errors received by test rig
Check if run is permissible value point with current test mode. If “Yes” (JA): Save under the giv-
en index.
Request „adjustment by test rig“: checking of the own measured values of the test points for
suitability for the adjustment. In case of feedback signal „YES“: carry out adjustment
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