SIL B12-10C Programming Manual

Minimum threshold or Low-level cut-off
The percentage of full scale below which the output signal is cut-off
to zero. This is applicable only to successful measurements within
the period defined by the Static State Timeout.
Minimum: 0.1, Maximum: 100, Default: 1
Tip...
This parameter is more suitable for measurements that
are typically well above 1Hz. As the sampling period is a
minimum of one second, it will take at least this time for
the output to clip to zero if such a measurement suddenly
stops.
NOTE: For correct functioning of the configuration software,
one place of decimal only may be entered.

Averaging count

Spurious input signals are attenuated by averaging the number of
input measurements specified by the Averaging Count. The
Averaging Count is the number of measurements used for
calculating the running average.
Minimum: 1 (no digital filtering), Maximum: 20, Default 5
Change threshold
(%)
To enable a rapid response to a change in the input signal, the most
recent input measurement is continuously compared with the
running average. If the change in input is greater than that specified
by the Change Threshold parameter, the current averaging cycle is
abandoned and a new one started.
Minimum: 0 (no averaging), Maximum: 100, Default: 10

Input and output readings

With an input signal connected, the input measurement (Hz) and
output value (% of FSD) are displayed by the software.
NOTES:
(I) Storing or reading parameters will cause the current
measurement of the input signal to be abandoned. The
software will generate a warning if a new measurement has not
taken place since the last computer reading taken.
(ii) Parameter settings are restricted by the software to valid
limits. Notification is given by the software in the event of
range errors.
(iii) Fractional precision outside valid limits will be truncated on
downloading to the instrument.
(iv) A warning will be given by the software if the minimum
threshold setting corresponds to a time greater than the
combined static state timeout for high and low states.
(v) Measurements outside of defined input range are clipped to
(% of FSD) limits with the exception of a 2.3% over-range which allows
measurements and outputs of up to 102.3% of full scale.

Troubleshooting

If no response is received from the F to A Converter, check the
following:
¨ The USB driver and programming software has been correctly
installed
¨ The Programme Protect Switch is set to the 'P' position.
¨ The correct COM port has been chosen.
¨ IR Link connections are secure.
¨ The F to A Converter is powered up.
¨ The IR Link Transceiver is positioned correctly.
¨ There are no other infrared sources which may temporarily
disrupt communications.
SIL
®
FREQUENCY TO ANALOGUE
CONVERTER
Programming Guide
For the following types B12-10C, C16-10 and
superceded types 107-10b and B12-10b
Document Ref: PGC16-10.vp Rev 2
STROUD INSTRUMENTS LTD.
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Telephone: +44 (0)1453 765433 Fax No: +44 (0)1453 764256
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