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FIGURE 26: Lemo Connector to GK-404
20 | TAKING READINGS | GEOKON
6.
TAKING READINGS
6.1 STRAIN GAUGE READOUT POSITIONS
Model
2:
Readout Position
Display Units
Frequency Range
Mid-Range Reading
Minimum Reading
Maximum Reading
TABLE 2: Strain Gauge Readout Positions
Note: When reading the 4150, the reading may continue to change slightly due
to a coil heating effect. Record the reading within the first few seconds of
exciting the gauge.
6.2 GK-404 VIBRATING WIRE READOUT
The Model GK-404 VW Readout is a portable, low-power, hand-held unit that is
capable of running for more than 20 hours continuously on two AA batteries. It
is designed for the readout of all
capable of displaying the reading in 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.
FIGURE 25: GK-404 Readout
6.2.1 OPERATING THE GK-404
26:
1.
Attach the flying leads by aligning the red circle on the silver Lemo
connector with the red line on the top of the GK-404 (see Figure 26). Insert
the Lemo connector into the GK-404 until it locks into place.
2.
Connect each of the clips on the leads to the matching colors of the sensor
conductors, with blue representing the shield (bare).
3.
To turn on the GK-404, press the On/Off button on the front panel of the
unit. The initial startup screen will display.
4.
After a delay, 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 through F.
4100 / 4150
4100-8 / 4150-4
(Standard Range)
(5,000 Microstrain)
E
B
microstrain (με)
digits
1400-3500 Hz
1400-3500 Hz
2500 με
6500
1000 με
3500
4000 με
9500
vibrating wire instruments, and is
GEOKON
4100-9 / 4150-5
(10,000 Microstrain)
B
digits
1400-3500 Hz
6000
2500
10,000
25:
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