WPI SI-BAM21-LC, Инструкция по эксплуатации

Страница: 11 / 20

SI-BAM21-LC
World Precision Instruments 7
3. Gently slide the tissue mounting hooks up on the pin that extends from the arm of the
micrometer. Some mounting hooks require an adapter ( Fig. 6 ).
If you are using one of the mounting hooks (type 1-8), which is designed for use with the
SI-KG4A , SI-KG4B and SI-KG7B force transducers, you must first slide the mounting
hook into the adapter ( Fig. 6 ) before sliding the adapter into the pin of the micrometer
arm. When the SI-KG2 force transducer is used with the large mounting hooks (types
9-11), no adapter is needed.
Fig. 6—The mounting hook slides into the adapter before it is installed in the micrometer assembly.
4. Set the Gain switch on the front panel of the SI-BAM21-LC to the gain (X1-X10) that is
suitable for the mass being used for the calibration of the selected transducer.
5. With no weight suspended from the transducer, press and release the Zero button
on the SI-BAM21-LC . Use the multimeter or data acquisition system to monitor the
transducer output signal from the SI-BAM21-LC . A reading of 0.0VDC ±50mV should
be seen. Remember that the zeroing error is larger with higher gains. Use the Offset
Adjustment switch to move the baseline of the recording closer to zero if a smaller
offset error is desired.
NOTE : When the Zero button is pressed, the zeroing LED illuminates to indicate that
the zeroing function is processing.
6. Use the Offset Adjustment switch to adjust the baseline to zero. Press and hold the
toggle switch to the left, if you want to raise the baseline. Or, press and hold the toggle
switch to the right to lower the baseline. If the baseline is more than 0.3V above zero,
the High LED illuminates, and if it is less than –0.3V, the Low LED illuminates. When the
baseline is within 0.3V of zero, the LEDs are off.
NOTE : Once the baseline is zeroed to the desired position, do not touch the Offset
Adjustment switch until the calibration procedure is completed.
7. From the point on the tissue mount of the transducer where the tissue will be attached,
suspend a known mass that is close to the maximum range for the amplification factor
and force transducer being used. In the example for the SI-KG4 force transducer, a
weight less than 5.0g is used for X1 or less than 0.5g for X10.
NOTE : Mass in grams can be converted to force in Newtons (N) by multiplying the weight
hung on the transducer by gravitational acceleration. Since force equals mass times
acceleration (F=ma), a 0.5g weight is equal to 4.9mN (0.0005kg * 9.8m/s
2
= 0.0049N).
Make sure that the mass used to calibrate the transducer amplifier creates a force that
falls within the operating range of the force transducer and amplification factor you
selected.
Tissue hook to transducer or adapter
Adapter for motor or
micrometer