APPENDIX B
27
14 MM EXTENSION CABLES
A. Electrical
Characteristics
The following specifications apply at 72° F (22° C) with AISI E4140 steel target and when test
equipment with accuracy as specified by Bently Nevada Corporation specification 150980 is
used. Typical is defined as 90% (2 sigma) of extension cables built, and worst case is defined
as 99.7% (3 sigma) of extension cables built.
1. Calibration Range
160 mils (4.06 mm) beginning at -2.0 Vdc,
approximately 20 to 180 mils
(0.51 mm to 4.57 mm)
2. Interchangeability Error with 14 mm System
a.
Average Scale Factor Change
i
Typical
ii
Worst
case
Less than 1.3 mV/mil (51 mV/mm)
Less than 2.4 mV/mil (94 mV/mm)
b.
Voltage Change at Same Gap (Max)
i
At midrange 120 mils 3.0
mm)
ii Near beginning of range, 20
mils (0.51 mm)
3. DC Resistance, Nominal
a.
Center
conductor
b.
Shield
4. Capacitance
5. Characteristic impedance
0.7 Vdc
0.4 Vdc
0.354 ohms/ft (1.16 ohms/metre)
0.017 ohms/ft (0.06 ohms/metre)
15.4 pF/ft (50.5 pF/metre)
95 ohms
Summary of Contents for Bently Nevada 7200 Series
Page 22: ...APPENDIX A 17 Figure A 1 14 mm Probe Ordering Information ...
Page 24: ...APPENDIX B 19 Figure A 3 14mm Extension Cable Ordering Information ...
Page 34: ...APPENDIX C 29 6 APPENDIX C SCALE FACTORS AND SENSITIVITY CURVES ...
Page 36: ...APPENDIX C 31 Figure C 2 Probe and One Foot Cable at Temperature ...
Page 38: ...APPENDIX C 33 Figure C 4 9 Metres Cable at Temperature ...
Page 42: ...APPENDIX C 37 Figure C 8 Effects of Flat Surface Side Clearance ...
