This page last updated July 18, 2001
for a special discussion of resetting problems
with the AquaCalc during measurements.
You may download an electronic version of the AquaCalc Pro Manual in Adobe Acrobat format, or contact us to request a printed version.
The Basic version of the AquaCalc 5000 firmware has a problem with two line segment meter rating curves. The intercept value (the fifth constant) is a fixed value of 2.2 and cannot be changed by the user. This two-segment feature was originally intended to be used only with ice-meters having a two-segment curve and a cross-over of 2.2. Please see the revised Basic firmware instructions for Using Non-Standard / User-Defined Meters for more information. You may contact Customer Support for information on an upgrade that will fix this problem.
In addition to AquaCalc’s Digital Magnetic Head for the Pygmy current meter, all meters that have mechanical or optical switches. This includes
While many of the standard meter's rating curves are built in to the AquaCalc, you can always add custom meter rating curves as additional meters.
The firmware version of your AquaCalc is displayed in the opening screens when the AquaCalc is first turned on. Please click here for more information and examples.
A: Check and test the AquaCalc’s meter cable connections. Are you trying to take a measurement in Station 1 position? The AquaCalc does not permit making a velocity measurement in Station 1.
Make sure that your measurement time is greater than zero. Very short measurement times (those less than 3 seconds) may measure so quickly that you can not see the display change.
A: No. As long as the 3 volt lithium backup battery is good, you will not lose stored data when you remove the 9 volt battery.
A: The AquaCalc 5000 uses 2 batteries: A 9-volt, and a backup battery. The AquaCalc Pro uses two 9V batteries. The 9 volt batteries should be replaced soon after the “low battery” message appears in the display. This message first appears when voltage in the battery has dropped to roughly 6.5 volts. The 3-volt lithium backup battery (coin cell) in the AquaCalc 5000 should be checked once a year. It needs to be replaced only if it tests less than 3 volts. Important: AquaCalc’s transect and measurement information stored in memory will be lost when removing the 3-volt backup battery, unless a good 9-volt battery is installed and the unit is turned on before the backup-battery (coin cell) is removed!
There are two primary reasons:
If you frequently perform measurements in turbulent flow conditions, you should consider updating your firmware EPROM to the latest version which has greatly improved turbulent flow handling capabilities.
Your slip rings or brushes may be dirty. Clean the slip ring and carbon contact on the reel.
The Advanced firmware (formerly know as the Professional Series) includes additional features not found in the Basic Series. Some of these include:
In addition, the Advanced (version H) firmware includes many additional features requested by the USGS’s HIF program, designed to ensure the accuracy and integrity of measurements. This version produces warning flags both on the display and in the output that identify if the wrong meter, suspension weight, or measurement was used for the stream conditions based on USGS measurement techniques guidelines.
The word “station” has a slightly different meaning when using an AquaCalc 5000 than you may be used to. A traditional “station” (vertical) is a position in a stream cross-section identified by a distance. Several measurements (observations) can be made at different depths at that same distance.
In the AquaCalc 5000, a station is the same as an observation. So, in the AquaCalc you can have two “stations”, each at a different depth, but both at the same distance. In the AquaCalc 5000, a station is an individual measurement (observation) at a given distance and depth. Two measurements (0.2 and a 0.6) taken at a given distance are both defined as stations.
To account for the Edge of Water, the AquaCalc 5000 will not measure at the first or the last vertical locations. This helps to define the edge-of water correctly.
See the Trouble-shooting section of your manual for more details, or contact Support.