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Summary of Contents for HT Italia HT39
- Page 1 ENGLISH User’s manual © Copyright HT ITALIA 2008 Release EN 1.03 - 04/02/2008...
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Page 2: Table Of Contents
4.2.1. MIN MAX........................9 4.2.2. PEAK/∆ ........................9 4.2.3. RANGE ........................9 4.2.4. HOLD ........................... 9 4.2.5. RS-232 for connection to PC (HT39 only)..............10 4.2.6. BACKLIGHT (HT39 only) ..................10 4.2.7. Disable AutoPowerOFF ..................... 10 4.3. Measurements.....................11 4.3.1. DC Voltage measurement..................11 4.3.2. -
Page 3: Safety Precautions And Procedures
HT37 - HT39 1. SAFETY PRECAUTIONS AND PROCEDURES This instrument conforms with safety Standard EN 61010-1 related to electronic measuring instruments. For your own safety and to avoid damaging the instrument follow the procedures described in this instruction manual and read carefully all notes preceded by this symbol When taking measurements: •... -
Page 4: During Use
HT37 - HT39 • Make sure that batteries are properly installed. • Before connecting the test probes to the installation, make sure that the function selector is positioned on the required measurement. • Make sure that LCD and function selector indicate the same function. -
Page 5: Measuring (Overvoltage) Categories Definitions
HT37 - HT39 1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS The norm EN 61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use, Part 1: General requirements, defines what measuring category, usually called overvoltage category, is. On paragraph 6.7.4: Measuring circuits, it... -
Page 6: General Description
HT37 - HT39 2. GENERAL DESCRIPTION This instrument performs the following measurements: • DC and AC TRMS Voltage. • DC and AC TRMS Current. • Resistance and Continuity test. • Diode test. • Frequency. • Capacitance. All selectable by means of a 10-position function selector (including OFF position). -
Page 7: Preparation For Use
HT37 - HT39 3. PREPARATION FOR USE 3.1. INITIAL This instrument was checked both mechanically and electrically prior to shipment. All possible cares and precautions were taken to let you receive the instrument in perfect conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may have occurred during transport –... -
Page 8: Operating Instructions
HT37 - HT39 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Front panel LEGEND: 1. LCD display. 2. Functions keys (RS-232 keys for HT39 only). 3. Rotary selector. 4. A input AC/DC current measurements. HzVΩµA input for other measurements. 6. COM input. -
Page 9: Function Keys
HT37 - HT39 4.2. FUNCTION KEYS When pressing a key, the corresponding symbol is displayed with a beep. To resume default state turn the selector on another function. 4.2.1. MIN MAX By pressing MIN MAX key, maximum and minimum values are measured. Both values are stored and can be recalled by pressing the same key. -
Page 10: Rs-232 For Connection To Pc (Ht39 Only)
HT37 - HT39 4.2.5. RS-232 for connection to PC (HT39 only) HT39 can be connected to a PC by means of the optional software package mod. SW39 (software + serial cable). To connect HT39 to a PC proceed as follows: Fig. -
Page 11: Measurements
HT37 - HT39 4.3. MEASUREMENTS 4.3.1. DC Voltage measurement CAUTION Maximum input for DC voltage is 1000V. Do not attempt to take any voltage measurement that exceeds the limits. Exceeding the limits could cause electrical shock and damage the multimeter. -
Page 12: Ac Voltage Measurement
HT37 - HT39 4.3.2. AC Voltage measurement CAUTION Maximum input for AC voltage is 750V rms. Do not attempt to take any voltage measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument. Fig. 4: AC Voltage measurement 1. -
Page 13: Dc Current Measurement
HT37 - HT39 4.3.3. DC Current measurement CAUTION Maximum input for DC current is 10A. Do not attempt to take any current measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument. Fig. 5: DC Current measurement 1. -
Page 14: Ac Current Measurement
HT37 - HT39 4.3.4. AC Current Measurement CAUTION Maximum input for AC current is 10A. Do not attempt to take any current measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument. Fig. 6: AC Current measurement 1. -
Page 15: Frequency Measurement
HT37 - HT39 4.3.5. Frequency measurement CAUTION Maximum input for AC voltage is 750V rms. Do not attempt to take any voltage measurement exceeding such limit to avoid the risk of electrical shock and damages to the instrument. Fig. 7: Frequency measurement 1. -
Page 16: Resistance Measurement
HT37 - HT39 4.3.6. Resistance measurement CAUTION Before taking resistance measurements in circuit remove power from the circuit being tested and discharge all capacitors. Fig. 8: Resistance measurement 1. Turn the selector on Ω. 2. Insert the test leads into the jacks, the red plug into HzVΩµA jack and the black plug... -
Page 17: Diode Test And Continuity Test
HT37 - HT39 4.3.7. Diode test and continuity test CAUTION Before taking resistance measurements in circuit remove power from the circuit being tested and discharge all capacitors. Fig. 9: Diode test and test continuity 1. Turn the selector on 2. Insert the test leads into the jacks, the red plug into HzVΩµA jack and the black plug... -
Page 18: Capacitance Measurement
HT37 - HT39 4.3.8. Capacitance measurement CAUTION Before taking any in circuit or capacitance measurement, remove power from the circuit being tested and discharge all capacitors. Use the short test lead pair for measurement in order to reduce the stray capacitance. Before connecting the test capacitor, note the display, which may show a reading other than zero whenever the range is changed. -
Page 19: Maintenance
HT37 - HT39 5. MAINTENANCE 5.1. GENERAL INFORMATION 1. This is a precision instrument. To guarantee its performances be sure to use it according to these instructions and keep it stored on suitable environmental conditions. 2. Do not expose it to high temperatures or humidity or direct sunlight. -
Page 20: Fuse Replacement
HT37 - HT39 5.3. FUSE REPLACEMENT CAUTION Before replacing fuses, disconnect test leads from any energized circuit to avoid electrical shock. LEGEND: 1. Turn OFF the meter and disconnect test leads from input terminals. 2. Remove the protective holster from the meter. -
Page 21: Technical Specifications
HT37 - HT39 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL FEATURES The accuracy is indicated as [% of reading + number of digits]. It is referred to the following environmental conditions: temperature 23°C ± 5°C, relative humidity < 80%. DC Voltage Range... -
Page 22: Electrical Specifications
HT37 - HT39 Resistance Range Resolution Accuracy Open voltage Overload protection ±(1.0%rdg+5dgt) 400.0Ω 0.1Ω 4.000kΩ 0.001kΩ ±(0.7%rdg+2dgt) 40.00kΩ 0.01kΩ 1.3V 600V rms 400.0kΩ 0.1kΩ ±(1.0%rdg+2dgt) 4.000MΩ 0.001MΩ ±(1.5%rdg+5dgt) 40.00MΩ 0.01MΩ Diode test Accuracy Test Open Range Resolution Overload protection (0.4 ÷ 0.8V) -
Page 23: General Data
2006/95/EEC (LVD) and to EMC directive 2004/108/EEC. 6.3. ACCESSORIES Standard accessories • HT37 or HT39 meter. • Test leads. • Battery (fitted). • Instruction manual. Optional accessories • Carrying bag – Code B80. • Software + serial cable (only HT39) – Code SW39. EN - 22... -
Page 24: Service
HT37 - HT39 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is guaranteed for one year against material or production defects, in accordance with our general sales conditions. During the warranty period the manufacturer reserves the right to decide either to repair or replace the product.
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