Geokon 1300, Instruction Manual

Page: 11 / 22

5
3. TAKING READINGS
3.1. Operation of the GK-401 Readout Box
The GK-401 is a basic readout for all vibrating wire transducers used in the Model A-9
Retrievable Extensometer.
Connect the Readout using the flying leads or in the case of a terminal station, with a connector.
The red and black clips are for the vibrating wire gage, the green or blue clip for the shield drain
wire. The GK-401 cannot read the thermistor (see Section 3.4).
1. Turn on the Readout. Turn the display selector to position "B". Readout is in "digits" (see
Equation 1).
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. Record the value displayed. If zeros are displayed
or the reading is unstable see section 6 for troubleshooting suggestions.
3. The unit will automatically turn itself off after approximately 4 minutes to conserve power.
3.2. Operation of the GK-403 Readout Box
The GK-403 can store gage readings and also apply calibration factors to convert readings to
engineering units. Consult the GK-403 Instruction Manual for additional information on Mode
"G" of the Readout. The following instructions will explain taking gage measurements using
Mode "B".
Connect the Readout using the flying leads or in the case of a terminal station, with a connector.
The red and black clips are for the vibrating wire gage, the white and green clips are for the
thermistor and the blue for the shield drain wire.
1. Turn on the Readout. Turn the display selector to position "B". Readout is in digits (see
Equation 1).
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 6 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.