OHAUS CKW-55, Service Manual

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1-2
CHAPTER 1 INTRODUCTION
1.2 TOOLS AND EQUIPMENT
1.2.1 Standard Tools and Test Equipment
The service shop should contain the following equipment:
1. Digital Voltmeter (DVM).
2. Megohmeter
3. Standard Electronics tool kit.
4. Desk magnifier on a stand.
5. Grounding mat and clip.
6. Flat blades and holder.
1.2.2 Special Tools
To service the CKW-55 Indicator, the following equipment is recommended:
1. A Load Cell Simulator
2. A computer
3. RS232 Cable Printer SF42 PN 80500574
4. RS232 Cable/PC 25-pin PN 80500553
5. RS232 Cable/PC 9-pin PN 80500552
1.3 CALIBRATION MASSES REQUIRED
The calibration masses required is dependent on the capacity and readability of the base used. The masses
required to test the CKW-55 Indicator when connected to an Ohaus CKW base must meet the requirements
of ASTM Class 4 or OIML F2. The mass values are listed in Table 1-1.
TABLE 1-1. CALIBRATION MASSES
MODEL Span Cal Linearity Cal
Cal in kg: Masses Totaling Masses Totaling
CKW3R55 3kg 1kg & 3kg
CKW6R55 6kg 3kg & 6kg
CKW15L55 15kg 7kg & 15kg
CKW30L55 30kg 15kg & 30kg
NOTE : During span calibration, a new span value may be entered. The span allowable range is 1kg or
1lb to 100% full scale. During linearity calibration a new midpoint value may be entered, the allowable
range is 25% to 75% full-scale capacity (whole numbers only). Values closest to 1/2 span capacity
will result in more accurate linearity.