Taking Readings; Gk-404 Readout Box; Operating The Gk-404; Figure 11 - Lemo Connector To Gk-404 - Geokon 4200 Series Instruction Manual

5. TAKING READINGS

5.1 GK-404 Readout Box

The Model GK-404 Vibrating Wire Readout is a portable, low-power, handheld unit that is
capable of running for more than 20 hours continuously on two AA batteries. It is designed for
the readout of all Geokon vibrating wire gages and transducers, and is capable of displaying the
reading in either digits, frequency (Hz), period (µs), or microstrain (µε). The GK-404 also
displays the temperature of the transducer (embedded thermistor) with a resolution of 0.1 °C.

5.1.1 Operating the GK-404

Before use, attach the flying leads to the GK-404 by aligning the red circle on the silver
"Lemo" connector of the flying leads with the red line on the top of the GK-404 (Figure
11). Insert the Lemo connector into the GK-404 until it locks into place.
Connect each of the clips on the leads to the matching colors of the sensor conductors,
with blue representing the shield (bare).
To turn the GK-404 on, press the "ON/OFF" button on the front panel of the unit. The
initial startup screen will be displayed. After approximately one second, the GK-404 will
start taking readings and display them based on the settings of the POS and MODE
buttons. The unit display (from left to right) is as follows:
• The current Position: Set by the POS button. Displayed as a letter A through F.
• The current Reading: Set by the MODE button. Displayed as a numeric value
followed by the unit of measure.
• Temperature reading of the attached gage in degrees Celsius.
Use the POS and MODE buttons to select the correct position and display units for the
model of strain gage purchased (see Section 5.4).
The GK-404 will continue to take measurements and display readings until the unit is
turned off, either manually, or if enabled, by the Auto-Off timer.
For more information, consult the GK-404 manual.

Figure 11 - Lemo Connector to GK-404

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