Chapter 1. Programming Site Data
24 DigitalFlow™ GF868 Programming Manual (1-Channel)
1.10.1 Setting Transducer Signal Limits (cont.)
The amplitude discriminator measures the size of the transducer signal received by the Model GF868. The default
value for this parameter is 14 and values from 0 to 100 are acceptable. The E5: AMPLITUDE error message appears when
the amplitude discriminator falls below the programmed AMP. DISCRIM LOW value. See the Service Manual for a
discussion of error codes.
8. Press [ENT] to accept the current Amp. Discrim High value or enter a new value and press [ENT].
IMPORTANT: Consult the factory before performing this step.
The amplitude discriminator measures the size of the transducer signal received by the Model GF868. The default
value for this parameter is 34 and values from 0 to 100 are acceptable. The E5: AMPLITUDE error message appears when
the amplitude discriminator exceeds the programmed AMP. DISCRIM HIGH value. See the Service Manual for a discussion
of error codes.
9. Press [ENT] to accept the current Delta T Offset value or enter a new value and press [ENT].
IMPORTANT: Consult the factory before performing this step.
An offset between the upstream and downstream transit times is specified at this prompt. The default value for this
parameter is 0 sec and values from –1000 to 1000 sec are acceptable.
10. Press [ENT] to accept the current Skan T Offset value or enter a new value and press [ENT].
At this prompt, specify a time measurement offset that compensates for any shift resulting from cross-correlation. The
default value for this parameter is 58 sec and values from –500 to 500 sec are acceptable.
Note: If you enter a value of 0 for this command, you enable a special mode of operation, ACTIVE SKAN T-OFFSET,
that dynamically calculates the offset.
11. Press [ENT] to accept the current % of Peak value or enter a new value and press [ENT].
The percentage of peak used to calculate the transit times and Delta T is specified at this prompt. The default value for
this parameter is 50% and values from 1 to 100% are acceptable.
12. Use the [ and [F1]-[F4] keys to select one of the preset values for the XMIT Sample Size from the option bar.
IMPORTANT: Consult the factory before performing this step.
Both the upstream and downstream transducers transmit ultrasonic pulses in bursts, which consist of a series of
transmit pulses. XMIT SAMPLE SIZE determines how many bursts are sent in one direction before sending in the other
direction. The default value for this parameter is 8 and values of 2, 4, 8, 16 and 32 are acceptable.
13. Press [ENT] to accept the current M>S_Switch value or enter a new value and press [ENT].
IMPORTANT: Consult the factory before performing this step.
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