Supa. Rule Cable height meters Feb 2004 Presented by: Gary Carroll Director
Using the Supa. Rule Cable Height Meter
Cable Height Meter • Ultrasonic handheld meter for measurement of • Cable height • Cable sag • Overhead clearance to ground. • Safest method for cable height measurement. • By eliminating cable contact and the use of heavy fiberglass poles
Cable Height Meter Key advantages: • Safety: • No contact with conductors • One simple solution: • One button-one man operation • Easy to use. • Efficient use of resources.
Cable Height Meter Competition • Telescopic rods: • Cumbersome, heavy to carry, break easy. • Accuracy depends heavily on experience of user. • Frequent calibration required. • Laser • Difficult to target conductors. • Accurate units cost € 3, 000€ 5, 000
Cable Height Meter Theory of operation • Sends (ultra) sound wave to target • Measures time to echo • Calculates distance based on speed of sound • Adjusts for air temperature
CHM Operation 1. Select: M(metric) or I (imperial) at the back of unit. 2. Set the CAL mode switch to the WIRE position. 3. Press the ON key to power on 4. Stand directly underneath the conductors(s) to be measured. 5. Press the MEASURE Key to take measurement 6. Press the READ key to display each of the stored wire height differences (Stored Measurements).
CHM Operation Taking a reading: Newer CHMs: Same Functions/ Different Implementation • • • Older CHM had a Clear (C) button, On newer models, to clear screen press Read (W: wire) and Measure (+) buttons together. Older CHM had a battery check button. Newer models have a low battery signal appearing on screen, if battery is low. Older units used (M) measurement to select differences between wires; newer models use READ button. • • • Press Measure (+). Unit automatically captures all wires within the ultrasonic cone. Read measurement by scrolling down the Read (W for wire) button, from 1 (lowest wire) to 2 (spacing in between cable 1 and 2), 3 and up to 6 wires, provided conductors are stacked above each other. If taking reading of wires parallel to each other, a number of separate measurement need to be taken.
Cable Height Meter Models available: Specification • 3 wires: CHM 300 • Accuracy: • 6 wires: CHM 600 • Minimum gap between wires: 150 mm • 3 to 15 m (=10 to 50 ft) • Operating Temp. Range: -10 °C to 40 °C Standard units: • Battery Life (9 V Alkaline type): CHM 300/600 • 3 to 23 m (= 10 to 75 ft) Model “E”: CHM 300/600 E 0. 5% ± 2 digits 50, 000 measurements • Auto power off delay: 3 minutes • Serial number location: underneath battery.
Cable Height Meter
Cable Height Meter • Screen is blank • • • Unit does not measure all wires Check battery is inserted correctly. Open battery door on the bottom rear of the unit. The battery is inserted with the terminals inwards. The + and - symbols on the battery should correspond with the + and - symbols on the inside of the battery compartment. If the display shows - - - Ensure that horizontal distances between wires are within the sonic beam. • Incorrect readings • Ensure CAL mode switch is on correct position, i. e. WIRE for cable height measurement, and WALL for horizontal distance measurement. Ensure no walls or similar obstructions within 2 meters either side of unit, as reflections from these can interfere with correct operation. • • This indicates a “poor target”, and normally happens when the cables are moving due to wind, etc.
Cable Height Meter Do: • • • Position the unit on the ground, directly underneath the conductor to be measured. Align the unit in the direction of the conductor, with the cone , pointing towards the conductor. Keep the unit dry; if wet, leave upside down in a warm area Don’t: • Avoid clutter around conductor to be measured • Avoid water, rain, snow, humidity. • Avoid sudden changes of temperature.
Cable Height Meter Warranty: • 12 months from purchase date. Calibration: • The CAL mode switch allows the user to periodically check the unit, to ensure it is still operating within specification. Date Repair: • Supa. Rule offers repair at a standard rate. • Quick turn around time - less than 1 week from receipt of unit. Return rate: • Under warranty - better than 0. 5% / year; typically 0. 2% Distance Measured Product Life • 5 -10 years • Supa. Rule offers calibration certificate at € 163 / unit.
Cable Height Meter Complementary products: • Dynamic Target (DT 80) with Model CHM 300 DT • Tripod • Leather case
Distance Measurement Feb 2004 Thank You
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