ENGLISH User manual Copyright HT ITALIA 2012 Release EN 1.
HT401 Table of contents: 1. PRECAUTIONS AND SAFETY MEASURES ............................................................... 2 1.1. Preliminary instructions ..................................................................................................... 2 1.2. During use ......................................................................................................................... 3 1.3. After use .................................................................................................
HT401 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with Directive IEC/EN 61010-1 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.
HT401 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 activating the rotary switch, disconnect the test leads from the circuit under test. When the instrument is connected to the circuit under test, do not touch any unused terminal. Avoid measuring resistance if external voltages are present.
HT401 2. GENERAL DESCRIPTION The instrument HT401 carries out the following measurements: DC and AC TRMS voltage DC and AC TRMS current Resistance and Continuity test Frequency of voltage and current Capacitance Diode test Temperature with type K probe DC/AC voltage measurement with low impedance (AutoV) Each of these functions can be selected using the 10-position rotary switch, including an OFF position. The instrument is also equipped with function keys (see § 4.
HT401 3. PREPARATION FOR USE 3.1. INITIAL CHECKS Before shipping, the instrument has been checked from an electric as well as mechanical point of view. All possible precautions have been taken so that the instrument is delivered undamaged. However, we recommend generally checking the instrument in order to detect possible damage suffered during transport. In case anomalies are found, immediately contact the forwarding agent.
HT401 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Description of the controls CAPTION: 1. LCD display 2. Function keys 3. MODE key 4. Rotary switch 5. Input terminal A 6. Input terminal mA 7. Input terminal measuring V . 8. Input terminal COM Fig.
HT401 4.2. DESCRIPTION OF FUNCTION KEYS The following § describes the functions of the different keys. When pressing a key, the display shows the symbol of the activated function and the buzzer sounds. 4.2.1. RANGE key Press the RANGE key to activate the manual mode and to disable the Autorange function. The symbol “RANGE” appears in the upper left part of the display. In manual mode, cyclically press the RANGE key to change measuring range: the relevant decimal point will / . In Autorange change position.
HT401 4.3. INTERNAL MODES OF INSTRUMENT 4.3.1. PEAK/HOLD mode When operating in PEAK/HOLD function, the instrument records the Max or Min voltage or current peak values. When a new MAX peak value or MIN peak value is detected, the instrument saves the new values. Press the key again to stop recording peak values. Press and hold the MIN/MAX key for 2 seconds to activate the PEAK HOLD mode. Press and hold the MIN MAX key for more than 1 second or turn the selector to exit the function. 4.3.2.
HT401 4.4. OPERATING INSTRUCTIONS 4.4.1. DC Voltage measurement CAUTION The maximum input DC voltage is 1000 V. Do not measure voltages exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument. Fig. 2: DC voltage measurement positions 1. Select or 2. Press the MODE key to activate “DC” or “AC+ DC” modes (see § 4.3.2) 3. Press the RANGE key to activate manual range selection (see § 4.2.1) or use the Autorange feature.
HT401 4.4.2. AC Voltage measurement and Frequency CAUTION The maximum input AC voltage is 1000 V. Do not measure voltages exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument. Fig. 3: AC voltage measurement or position 1. Select the 2. Press the MODE key to activate “AC” or “AC+ DC” modes (see § 4.3.2) 3. Press the RANGE key to activate manual range selection (see § 4.2.1) or use the Autorange feature.
HT401 4.4.3. AC Voltage measurement with low input impedance CAUTION The maximum input AC voltage is 1000 V. Do not measure voltages exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument. Fig. 4: AC voltage with low impedance (LoZ) 1. Select the AutoV LoZ position (see § 4.3.3) 2. Insert the red cable into input lead V and the black cable into input lead COM (see Fig. 4) 3.
HT401 4.4.4. DC Current measurement CAUTION The maximum input DC current is 10A. Do not measure currents exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument Fig. 5: DC current measurement 1. Cut off power supply from the circuit to be measured. or positions Select the Insert the red cable and the black cable into the input terminals mA or A and COM Press the MODE key to activate “DC” or “AC+ DC” modes (see § 4.3.
HT401 4.4.5. AC Current measurement and Frequency CAUTION The maximum input AC current is 10A. Do not measure currents exceeding the limits given in this manual. Exceeding these limits could result in electrical shocks to the user and damage to the instrument. Fig. 6: AC current measurements 1. Cut off power supply from the circuit to be measured. 2. 3. 4. 5.
HT401 4.4.6. Resistance measurement CAUTION Before attempting any resistance measurement, cut off power supply from the circuit to be measured and make sure that all capacitors are discharged, if present. Fig. 7: Resistance measurement 1. Select the position / 2. Insert the red cable into input lead V and the black cable into input lead COM 3. Press the RANGE key to activate manual range selection (see § 4.2.1) or use the Autorange feature.
HT401 4.4.7. Diode and Continuity test CAUTION Before attempting any resistance measurement, cut off power supply from the circuit to be measured and make sure that all capacitors are discharged, if present. Fig. 8: Diode and continuity test 1. 2. 3. 4. 5. 6. 7. 8. Select the position / Press the MODE key to start testing diodes.
HT401 4.4.8. Capacitance measurement CAUTION Before carrying out capacitance measurements on circuits or capacitors, cut off power supply from the circuit being tested and let all capacitance in it be discharged Fig. 9: Capacitance measurement Select the position / Press MODE key to activate capacitance measurement Insert the red cable into input lead V and the black cable into input lead COM Press the RANGE key to activate manual range selection (see § 4.2.1) or use the Autorange feature.
HT401 4.4.9. Temperature measurement Fig. 10: Temperature measurement 1. Select the position 2. Press the MODE key to select measurement in °C or °F 3. Insert the supplied adapter into the input terminals V and COM respecting the red and black colours found on it. 4. Connect the K-type probe to the instrument by means of the adapter, respecting the positive and negative polarity on the probe’s plug. The display shows the value of temperature 5. The message “O.
HT401 5. MAINTENANCE CAUTION 5.1. Only expert and trained technicians should perform maintenance operations. Before carrying out this operations, make sure you have disconnected all cables from the input terminals Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight Always switch off the instrument after use.
HT401 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL CHARACTERISTICS Accuracy is indicated as [% rdg + (dgt number) * resolution] at 23°C ± 5°C,< 80%HR DC Voltage Range Resolution Accuracy 60.00mV 600.0mV 6.000V 60.00V 600.0V 1000V 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V (0.08rdg+10dgt) (0.08rdg+2dgt) Input impedance Protection against overcharge 10M // < 100pF 1000VDC/ACrms Input impedance Protection against overcharge 10M // < 100pF 1000VDC/ACrms AC TRMS Voltage Range Resolution 60.00mV 600.
HT401 DC Current Range Resolution 60.00mA 0.01mA 600.0mA 6.000A 10.00A 0.1mA 0.001A 0.01A Accuracy Measuring time Protection against overcharge (0.8rdg+3dgt) 3min (A) 10min (mA) max 440mA (mA) max 11A (A) Accuracy (50Hz 1kHz) Measuring time Protection against overcharge (1.2rdg+3dgt) 3min (A) 10min (mA) max 440mA (mA) max 11A (A) Accuracy (50Hz 1kHz) Measuring time Protection against overcharge (2.
HT401 Continuity test Range Resolution Accuracy Protection against overcharge 600 0.1 (0.8rdg+5dgt) 1000VDC/ACrms Buzzer activated for R < 30 and deactivated for R > 100 Capacity Range Resolution Accuracy Protection against overcharge 1.000F 10.00F 100.0F 1.000mF 10.00mF 0.001F 0.01F 0.1F 0.001mF 0.01mF (1.2rdg+2dgt) 1000VDC/ACrms Maximum time for reaching results: 0.7s C<1mF; 3s C> 1 mF Temperature with type K probe Range Resolution Accuracy (*) -40.0 400 °C 0.
HT401 6.2. ENVIRONMENT 6.2.1. Environmental conditions for use Reference temperature: 23 ± 5°C (73 ± 41°F) Operating temperature/humidity: -10 ÷ 50°C (14 ÷ 122°F) -10 ÷ 30°C (<80%RH); 30 ÷ 40°C (<75%RH); 40 ÷ 50°C (<45%RH) Storage temperature/humidity: -20 ÷ 60°C (-4 ÷ 140°F) (battery not inserted) Storage humidity: <80%RH (battery not inserted) This instrument satisfies the requirements of Low Voltage Directive 2006/95/EC (LVD) and of EMC Directive 2004/108/EC 6.3. ACCESSORIES 6.3.1.
HT401 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. Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance.
