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16. As the salt wave travels past the EC.T probe(s), observe the EC.T trace rise
and fall
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. The derived Q will change as the EC.T changes. The EC.T may
take a very long time (>1hr) to reach BG EC.T, when the derived Q does
not change much with time. QiQuac shows the change in the derived Q
for each new measurement of EC.T. When this value alternates about zero,
it can be assumed to have reached BG EC.T. If time constraints (helicopter
for example) prevent this, there will be more uncertainty in the derived Q.
You can also zoom in on the Y-axis so better see trends.
17. Push the button at any time to access the context menu, which has 8
options. Push and hold at most options to return to the SDIQ (except Adj
Pre-BG_ECT)
a. Finish SDIQ: Select this to finish the SDIQ and bring up the SDIQ
Summary card. Data will continue to log until you leave the sum-
mary card. When you Finish an SDIQ, a line is written to the SDIQ_
Summary file in the directory. You can back out of the Summary
Card by pushing and holding the button.
b. Adj Pre-BG_ECT: You can almost always achieve a lower Uncer-
tainty by selecting Adj Pre-BG_ECT. Two vertical bars will appear
indicating the period being averaged for the Pre-BG_ECT. Move
these closer to the start of the Breakthrough Curve and watch the
Uncertainty and Q change. Turning slowly will change the bars by
BG_N/10 records and turning quickly will change by BG_N. Push
the button to accept the new Pre-BG_ECT period. This function
adjusts the Pre-BG_ECT for the Displayed channel. After finishing
with one channel, turn the dial counter-clockwise to change the
displayed channel and repeat. The difference between the pre-
and post-wave BG EC.T will be taken into account in the derived Q
and associated uncertainty
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.
i. If Ch2 is currently Displayed, and if Use Ch2 AS 3U/S is “1”
then a single thick bar appears. This is the point of injection.
Adjust this to the approximate time of injection.
ii. If Auto Adj. Pre-BGECT is set to a non-zero integer in Set-
up>Meta Settings, then the Pre-BGECT may already be at the
base of the Breakthrough Curve.
c. Adj Mass: Use this to adjust the mass in realtime. This is often the
case if you weigh the mass after starting the SDIQ.
d. Enter Stage: This value is currently not used for anything in the
SDIQ (we hope to integrate Rating Curves in future firmware) but
you can enter the stage here as a way to record it on the SDIQ. It is
written to the end of the Summary file record.
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If “Auto Adj. Pre-BGECT” is set to a non-zero integer, the QiQuac will Quack and adjust the Pre-BGECT to the start of the pulse. The EC.T label
will change from “ECT:” to “ECT=”
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The Q%Unc uses the Standard Deviation of the entire BG EC.T sample. If the Pre- and Post-samples vary significantly (i.e. incomplete trace)
this will be reflected in the diagnotic.
C H A P T E R 3: OPE R AT ION
