ENGLISH User manual Copyright HT ITALIA 2012 Release EN 2.
HT77N Table of contents: 1. PRECAUTIONS AND SAFETY MEASURES ............................................................... 2 1.1. 1.2. 1.3. 1.4. 2. 3. GENERAL DESCRIPTION ........................................................................................... 4 PREPARATION FOR USE ........................................................................................... 4 3.1. 3.2. 3.3. 3.4. 4. Preliminary instructions ................................................................................
HT77N 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with directive IEC/EN61010-1 relevant to electronic measuring instruments. For your safety and in order to prevent damaging the instrument, please carefully follow the procedures described in this manual and read all notes preceded by the symbol with the utmost attention.
HT77N 1.2. DURING USE Please carefully read the following recommendations and instructions: CAUTION Failure to comply with the Caution notes and/or Instructions may damage the instrument and/or its components or be a source of danger for the operator. Before switching on the clamp, remove the conductor from the clamp jaw. When the instrument is connected to the circuit under test, do not touch any unused terminal.
HT77N 2. GENERAL DESCRIPTION Dear Customer, thank you for choosing one of the instruments in our range. If used according to the instructions given in this manual, the clamp you have just purchased will guarantee accurate and reliable measures. The clamp is designed to guarantee maximum safety, thanks to a newly conceived development, which ensures double insulation and enables the clamp to reach CAT III 300V in compliance with standard IEC/EN61010-1.
HT77N 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Description of the controls CAPTION: 1. Inductive clamp jaw 2. Opening lever 3. /Data/Auto/Peak Hold key 4. Wide/50-60Hz/Compare key 5. Range key 6. LCD display 7. Display backlight sensor Fig. 1: Instrument description 4.1.2. Alignment marks and hand protection Put the conductor as close as possible to the middle of the jaws on the intersection of the indicated marks (see Fig. 2) in order to meet the meter accuracy specifications.
HT77N 4.2. 4.2.1. DESCRIPTION OF FUNCTIONS KEYS /Data/Auto/Peak Hold key Switching on/off Shortly pressing the “ ” key allows switching on the clamp. While switching on, the display shows the charge percentage of the power supply battery. Replace the battery the 0% appears (see § 5.2). To switch off the clamp, press and hold the “ ” key for about 3 seconds.
HT77N 4.2.2. Wide/50-60Hz/Compare key Wide/50-60Hz Shortly pressing the Wide/50-60Hz/Compare key allows enabling the low-pass filter, which has a cutting frequency of approx. 100Hz. When the function is enabled, the full scale is forced in manual mode and the display shows “50-60Hz”. Shortly pressing the Wide/50-60Hz/Compare key again, with enabled function, allows disabling the low-pass filter and going back to the normal measuring mode.
HT77N 4.3. OPERATING INSTRUCTION 4.3.1. AC Current measurement CAUTION Insert the cable in the middle of the clamp jaws, in order to obtain accurate measures. Use the marks as a reference (see 4.1.2) Correct Incorrect Fig. 3: Use of the clamp for AC current measurement 1. Switch on the clamp by pressing the key 2. Select the desired capacity with the Range key or keep in the Autorange mode 3. Open the clamp jaw and insert the cable in the middle of it (see Fig. 3).
HT77N 4.3.2. Leakage current measurement CAUTION Insert the cable(s) in the middle of the clamp jaws, in order to obtain accurate measures. Use the marks as a reference (see § 4.1.2) Fig. 4: Measuring leakage current with direct method in a single phase load Fig. 5: Measuring leakage current with indirect method in a single phase load Fig. 6: Measuring leakage current with direct Fig.
HT77N 5. MAINTENANCE 5.1. GENERAL INFORMATION 1. The instrument you purchased is a precision instrument. While using and storing the instrument, carefully observe the recommendations listed in this manual in order to prevent possible damage or danger during use. 2. Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight. 3. Always switch off the instrument after use.
HT77N 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL CHARACTERISTICS Accuracy indicated as [%reading + (digit number*resolution)] at 23°C±5°C, < 80%RH AC TRMS current Range Resolution 6mA (*) 0.001mA 60mA 0.01mA 600mA 6A 0.1mA 0.001A 60A 0.01A 100A 0.
HT77N 6.1.1. Electrical specifications Conversion type: Sample rate: Temperature coefficient: TRMS 4 times / second 0.2x(accuracy) /°C, <18°C o >28°C 6.1.2. Reference guideline Safety: Insulation: Pollution level: Max height of use: Measurement category: IEC/EN61010-1 double insulation 2 2000m (6562 ft) CAT III 300V 6.1.3. General characteristics Mechanical characteristics Size (L x W x H): Weight (battery included): Jaw opening: Max.
HT77N 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is warranted against any material or manufacturing defect, in compliance with the general sales conditions. During the warranty period, defective parts may be replaced. However, the manufacturer reserves the right to repair or replace the product. The manufacturer declines any responsibility for injury to people or damage to property.