Showa 5683, Operation Manual

Page: 24 / 68

３−３
the digital monitor (3), and then the cable length compensation (indication of the rate of
damping) and auto-balancing are performed. If there is a cable disconnection or short, the
examination results are indicated on the digital monitor (3) repeatedly. The contents to be
indicated are listed on the pages from 3-4 to 3-5. Following the indicated results (page 3-5),
repair the cable or bridge. After the repair, press BAL again for at least five seconds to check
for failures.
The cable length compensation automatically calculates the voltage drop occurring in the
cable connecting between the amplifiers and measurement point (bridge), saving this
calculation data into the internal memory. The power supply to the bridge is provided after
this adjustment. As a result, high-accuracy strain measurement is available without
considering the conductor resistance generated by the cable.
After the cable length compensation is made, the initial balance is made, and then the green
LED in the middle illuminates. For further fine-tuning, turn the BAL knob (4) clockwise or
anti-clockwise. The adjustment range is an output of
±
1 V.
* The cable length compensation data is stored in the internal memory until the BAL
switch is pressed, even if the power switch (19) is turned on or off. The wire length
function is set to off or non-adjustment by the dip switch on the bottom face of the
amplifiers.
* For more information on bridge check function and cable length compensation, see
the pages from 3-5 to 3-7.
(7) In response to the magnitude of the strains anticipated, apply a calibration value using the
calibration setting knob (12) first, and then start measuring.
The measuring range can be checked after applying a calibration value using the calibration
value application switch (14). The measuring ranges for the amplifiers are described in
Measuring Ranges for Models 5683/5684 on page 3-4.