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2. Turn the unit on and a reading will appear in the front display window. The last digit
may change one or two digits while reading. Press the "Store" button to record the
value displayed. If the no reading displays or the reading is unstable see section 5
for troubleshooting suggestions. The thermistor will be read and output directly in
degrees centigrade.
3. The unit will automatically turn itself off after approximately 2 minutes to conserve
power.
4.3 Operation of the GK-404 Readout Box
The GK404 is a palm sized readout box which displays the Vibrating wire value and the
temperature in degrees centigrade.
The GK-404 Vibrating Wire Readout arrives with a patch cord for connecting to the
vibrating wire gages. One end will consist of a 5-pin plug for connecting to the socket on
the bottom of the GK-404 enclosure. The other end will consist of 5 leads terminated
with alligator clips. Note the colors of the alligator clips are red, black, green, white and
blue. Only the red and black clips are used. Connect first to the red and black leads of
the 4500HT cable (pressure) and then to the green and white leads (temperature).
Use the POS (Position) button to select position B and the MODE button to select Dg
(digits).
Other functions can be selected as described in the GK404 Manual.
The GK-404 will continue to take measurements and display the readings until the OFF
button is pushed, or if enabled, when the automatic Power-Off timer shuts the GK-404
off.
The GK-404 continuously monitors the status of the (2) 1.5V AA cells, and when their
combined voltage drops to 2V, the message Batteries Low is displayed on the screen.
A fresh set of 1.5V AA batteries should be installed at this point
5
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