Megger CHM2000 Data sheet

CHM Series

Cable Height Meters

CHM Series

Cable Height Meters

■

Dramatically reduces measuring time

■

Inherently safe

■

Designed for ease-of-use

■

Hand-held portability

■

Calibration and maintenance free operation

■

No physical connection to cables or wires

■

Measures the height of up to six overhead cables

DESCRIPTION

The CHM Series of Cable Height Meters utilize ultrasonic techniques to determine the height of up to six overhead cables and wires. The instruments are designed to address specific measuring requirements on cables up to 75 feet (23 m). The CHM600 (C/N 659600) and CHM600E (C/N 659600E) are designed primarily for power cable applications, while the CHM2000 is designed for telecommunication applications.

The Cable Height Meters emit short bursts of sound which originate from the cone shaped transmitter. The

oprocessor in the instruments calculates the elapsed

micr time for the bursts of sound to be reflected from the cable back to the instruments. The result can be displayed in

e the final

either feet and inches or meters. However

, befor measurement can be displayed, the air temperature must be measured because the speed of sound varies at approximately 0.2 percent per degree Celsius.

A temperature sensor, mounted at the front of the instruments, senses the actual air temperature. This

mation is sent to the micr

infor

oprocessor and incorporated into the algorithm. The distance is then displayed in meters or feet and inches depending on which was selected.

APPLICATIONS

The Cable Height Meters ar

e capable of measuring the lowest cable, provided it is within range. Additionally the spacing between the next five cables can be displayed. This is accomplished by standing directly beneath the cable and aligning yourself longitudinally (looking down

the line). Simply press the “ON” button to power the instrument up and allow the temperature to stabilize. Press the ‘MEASURE’ button and if necessary gently “rock and tilt” the instrument until a stable reading is obtained. Applications include measuring cable heights of:

■

Telephone lines

■

Distribution lines

■

Transmission lines

■

Cable television (installers and contractors)

■

eet lights

Str

■

Sag (lowest point to gr

■

Separation between up to six cables

ound)

The instrument can be used to ensure that OSHA overhead clearance regulations are met at construction sites. It also provides a safer way to measure cable heights on highly congested roadways.

Additionally the Cable Height Meters offer an easy way to check whether the device has r since its pur

chase date. Switching to ‘CAL’ mode also

emained in calibration

allows the instruments to be used indoors.

TURES AND BENEFITS

FEA

■

Ease-of-use

Simple, thr

—

ee button operation ensur

es fast, effective measurements with a minimum of operator training.

■

Compact size — Its light weight and hand-held portability allows easy transport and multiple measurements.

■

Inherently safe — No physical connection to cables or

ires required to obtain measurement.

■

Battery condition indicator — Shows the battery warning symbol when the battery voltage falls to approximately 6

olts.

■

Automatic power off — Conserves battery power when idle after three minutes.

■

Calibration and maintenance free operation — Minimal down time.

■

Pre-selectable measuring modes — Will read in either meters or feet and inches for universal use.

■

Six cable measurement capability — Handles almost any field application.

■

Quicker measurement of cable height — Saves time and money.

SPECIFICATIONS

Resolution

1/4 in. (5 mm) if < 10 m 1/2 in. (10 mm) if > 10 m

Accuracy

Typically less than 0.5% error ±2 digits

Power source

9 volt alkaline leak-proof battery (included)

Operating Temperature

14º F to 104º F (-10º C to 40º C) with compensation over the full range.

Storage

Store in dry area. Do not expose to extreme temperature. Use only leak proof batteries.

Battery Life

> 50,000 Measurements

Dimensions

3 H x 4 W x 8.5 D in. (70 H x 100 W x 205 D mm)

eight

1.1 lb (.5 kg)

CHM Series

Cable Height Meters

(Minimum Cable Size)

odel 1.00 in. 0.50 in. 0.25 in. 0.125 in.

(Cat. No.) 24.4 mm 12.7 mm 6.5 mm 3.2 mm

CHM600 10 to 50 ft. 10 to 50 ft. 10 to 39 ft. 10 to 32 ft. (659600) 3 to 15 m 3 to 15 m 3 to 12 m 3 to 10 m

CHM600E 10 to 75 ft 10 to 50 ft ——— ——— (659600E) 3 to 23 m 3 to 15 m

CHM2000 7 to 35 ft 7 to 35 ft 7 to 35 ft 7 to 32 ft

2 to 10.7 m 2 to 10.7 m 2 to 10.7 m 2 to 9.7 m

Measurement ranges are on the assumption that the air temperature is approximately 68º F (20º C). At lower temperatures, the range increases and conversely, at higher temperatures, the range decreases.

The CHM2000 being used to measur cable

e the height of the over

head

ORDERING INFORMATION

Item (Qty) Cat. No.

Cable Height Meter

35 ft. max. height (telecom application)

50 ft. max. height (power application) 659600

75 ft. max. height (power application) 659600E

Optional Accessory

Leather case for Cat. No. 659600 and 659600E only 659601

chcliffe Road, Dover

Ar CT17 9EN England T (0) 1 304 502101 F (0) 1 304 207342

UNITED STATES

4271 Bronze Way Dallas, TX 75237-1019 USA T 1 800 723 2861 T 1 214 333 3201 F 1 214 331 7399

CHM2000

OTHER TECHNICAL SALES OFFICES

Norristown USA, T Mumbai INDIA, T Sydney AUSTRALIA, Madrid SPAIN and The Kingdom of BAHRAIN.

oronto CANADA,

rappes FRANCE,

ISO STATEMENT

Registered to ISO 9001:2000 Reg no. Q 09250

Registered to ISO 14001 Reg no. EMS 61597

CHMSERIES_DS_

.megger

www Megger is a registered trademark

.com

En_V03