Operating Instructions METRA HIT 1A/2A Analog Multimeter 3-349-305-15 2/7.
1 2 3 4 5 8 6 7 1 Common connection for all measuring ranges (instrument earth) 2 METRA HIT 2A: connection for highest current measuring range 15 A 3 Connection for resistance measurement and capacitance measurement (negative potential) 4 Connection for all voltage and current ranges except for METRA HIT 2A: here current measuring range up to 1.
Contents Page 1 Safety Features and Precautions ......................................4 2 Application ........................................................................6 3 Description ........................................................................7 4 Operation ..........................................................................8 4.1 4.2 4.3 4.3.1 4.4 4.4.1 4.4.2 4.5 4.6 4.7 4.8 Controls .........................................................................................
1 Safety Features and Precautions You have selected an instrument which provides you with a high level of safety. This instrument fulfills the requirements of the applicable European and national EC guidelines. We confirm this with the CE marking. The relevant declaration of conformity can be obtained from GOSSEN METRAWATT GMBH. The analog/digital multimeter has been manufactured and tested in accordance with safety regulations IEC 61010–1:2001/ DIN EN 61010–1:2001/VDE 0411–1:2002.
• • • • • • • The instrument may only be used for current measurement in power systems if the electrical circuit is protected with a fuse or a circuit breaker with a rating of up to 20 A. In order to conform to the CAT requirements, two fuse links have been fitted for the ranges mA und A. Be prepared for the occurrence of unexpected voltages at devices under test (e.g. defective devices). For example, capacitors may be dangerously charged.
Meaning of symbols on the instrument ! Warning concerning a point of danger (Attention: observe documentation) Continuous, doubled or reinforced insulation CAT II Measuring category II instrument 500 V Ground Fuse Indicates EU conformity 2 Application The multimeter is suited for voltage, current and resistance measurements and for the rough measurement of capacitance.
3 Description The multimeter has measuring ranges for direct and alternating voltage, direct and alternating current and resistance. Capacitance values can be ascertained by rough measurements. All the measuring ranges are selected by means of the central range switch. They are clearly arranged in the rotary section of the switch. A mirror is placed behind the scale for accurate reading of the measured values.
4 Operation 4.1 Controls Measuring range switch The multimeter has only one rotary switch by which all the measuring ranges are selected. The meter can be switched from the direct voltage ranges to the corresponding alternating voltage ranges, or from the direct current ranges to the corresponding alternating current ranges, without switching off the measured value. It must be ensured that the measuring range switch is first set to the highest measuring range when measuring voltage and current.
Potentiometer knob The rotary knob is used to set the full deflection 0 Ω when measuring resistance as described in chapter 4.5 and capacitance according to chapter 4.6. 4.2 Starting the Instrument (Ω Measurement only) Inserting the battery The bottom half must be removed from the instrument in order to install or exchange the battery. ! ➭ Press the catch on the rear of the instrument, using a test point, banana plug or similar object, in the direction of the arrow and remove the lower section.
• If necessary, adjust the set screw on the rear of the instrument with a screwdriver to correct the setting. Battery check ➭ Set the range switch to the „Ω x 1“ position. ➭ Short-circuit connecting sockets „⊥“ and „Ω“ using a measuring lead. ➭ Set the pointer to full deflection position 0 Ω using potentiometer knob. If it is no longer possible to set the full deflection or if the reading does not remain constant after setting, the mignon cell is spent or the pigtail fuse is defective. 4.
4.3.1 DC and AC Voltages up to 500 V ➭ Set range switch to the position 500 V or 500 V . ➭ Plug test leads into the instrument; (black) test lead to socket „⊥“ and (red) lead to socket „+ V, “. For safety reasons, the test leads with shock-protected connection plugs should be used. ➭ Apply the voltage measured to the test leads. For DC voltage, socket „⊥“ must be connected to the negative pole of the measured voltage and socket „+ V,A “ to its positive pole.
4.4 ! Current Measurement Attention! The multimeter must always be connected into the lead the voltage of which is the lowest relative to earth. For safety reasons, the voltage relative to earth must not exceed 500 V CAT II! Observe the overload limits, see tables on page 23. 4.4.1 DC and AC Voltages (METRA HIT 2A: up to 1.5 A) ➭ Set range switch to the position 5 A or 5 A (METRA HIT 2A: 1.5 A or 1.5 A ). ➭ Plug test leads into the instrument; (black) test lead to socket „⊥“ and (red) lead to „+ V, A “.
➭ ➭ If the measuring current is less than 500 mA. set the measuring range switch to lower direct current ranges in the case of direct current, and to lower alternating current ranges in the case of alternating current, until the optimum deflection is obtained. Read off the measured value: METRA HIT 1A: for DC on scale 0 ... 15 V,A , for AC on scale 0 ... 15 V,A . METRA HIT 2A: for DC on scale 0 ... 15 V,A , for AC on scale 0 ... 15 V,A . 4.4.
4.5 Resistance Measurements Resistance is measured with DC voltage from the 1.5 V mignon cell. The table of measuring ranges in chapter 5 gives the maximum measuring currents for full deflection and a battery voltage of 1.5 V. Socket polarity is as follows: Positive pole on socket „⊥“ Negative pole on socket „Ω“ ➭ Set range switch, depending on the measured value expected, to one of the ranges Ω x 1 ... Ω x 1000. ➭ Plug in the test leads to sockets „⊥“ and „Ω“. ➭ Short-circuit the test leads.
! ➭ Attention! Only voltage-free objects may be measured. External voltages falsify the measuring results and might also damage the instrument! Read off the value displayed on the Ω scale and multiply by the factor according to the adjusted measuring range. If possible, the measuring range should be selected in such a way as to obtain a reading in the range 5 ... 50 Ω. The measuring error, in relation to the actual resistance value, is smallest in the middle of the deflection range.
4.6 Estimated Capacitance Measurement Capacitance values can be determined in the resistance ranges by estimated measurement. When doing so, proceed exactly as if measuring resistance in accordance with chapter 4.5. Resistance Rx is to be replaced by the capacitance to be measured, after prior discharge. When the capacitor is connected, the pointer of the instrument swings to a maximum value and then returns to its initial position (mechanical zero point).
4.7 Measurement of Gain and Attenuation In communications engineering, gain or attenuation is almost exclusively given as a logarithm of the ratio between a measured voltage and a given reference voltage in dB. In recurrent networks, it is thereby possible to determine the total gain or attenuation in a simple manner by adding or subtracting the individual values. The reference voltage is 0.775 V (1 mW for 600 Ω); attenuation at this voltage is 0 dB.
Example: For a 1 kHz superposed AC voltage, a series-connected capacitor of Cv = 0.0056 µF = 5.6 nF results for the 50 V measuring range. ! 4.8 Attention! The capacitor is loaded up to the value of the DC voltage component. The load can assume a magnitude that can be lethal and retain this load for quite some time.
5 Technical Characteristics Voltage Measuring Ranges 0.15 V — 3.15 kΩ 0.50 V — 10.00 kΩ — –15 ... + 6 dB 31.50 kΩ 6.50 kΩ 5.00 V – 5 ... + 16 dB 100.00 kΩ 20.00 kΩ 15.00 V + 5 ... + 26 dB 315.00 kΩ 65.00 kΩ 1.50 V 1) Internal Resistance approx. Output 1) Voltage — 50.00 V +15 ... + 36 dB 1.00 MΩ 200.00 kΩ 150.00 V +25 ... + 46 dB 3.15 MΩ 650.00 kΩ 500.00 V +35 ... + 56 dB 10.00 MΩ 2.00 MΩ 0 dB 0.775 V in the range of 1.
METRA HIT 2A: Current Measuring Ranges Voltage Drop approx. Current 0.158 V — 1.5 mA 50 µA 1.16 V 1.21 V 15 mA 1.25 V 1.25 V 150 mA 1.25 V 1.25 V 1.5 A 1.95 V 1.95 V 15 A 0.43 V 0.49 V Resistance Measuring Ranges Resistance Measuring Limits Value at Mid-Scale (Ri) Max. Meas. Current Imax2) approx. Ω x 1 1 Ω ... 1 kΩ 18.00 Ω 83 mA Ω x 10 10 Ω ... 10 kΩ 180.00 Ω 8.3 mA Ω x 100 Ω x 1000 2) 100 Ω ... 100 kΩ 1 kΩ ... 1 MΩ 1.8 0 kΩ 0.83 mA 18.00 kΩ 0.
Reference Conditions Ambient temperature +23 °C ±2 K Position of use horizontal Frequency 40 ... 60 Hz Wave shape for : sinusoidal Relative humidity 40 ... 60% The instrument features half-wave rectification and is calibrated in r.m.s. values. It evaluates the arithmetical mean of a half-wave and indicates different values for undulatory voltage or current, depending on the polarity of connection.
Power Supply Battery for resistance measurement Elektrical Safety Protection class Measuring category Nominal voltage Test voltage Contamination level Fuses 1 mignon cell 1.5 V per IEC LR6/R6 (AA-Size), leak-proof II per IEC/EN 61010-1:2001/ VDE 0411-1:2002 II 500 V 3.5 kV~ 2 replaceable METRA HIT 1A: F1: FF630mA/700V AC (50 kA), 6.3 x 32 F2: FF6,3A/500V AC (50 kA), 6.3 x 32 METRA HIT 2A: F1: FF1,6A/700V AC (50 kA), 6.3 x 32 F2: FF16A/500V AC (50 kA), 6.
METRA HIT 1A: Overload capacity Range loadable up to 0.15 0.5 1.5 5.0 15.0 50.0 150.0 500.0 V– V– V– V– V– V– V– V– 50.0 0.5 5.0 50.0 500 .0 5 000.0 µA – mA – mA – mA – mA – mA – Range 1) 2) 2) 2) 2) 2) 2) 2) — — 1.5 5.0 15.0 50.0 150.0 500.0 V V V V V V 1.0 mA 5.0 mA 10.0 mA 70.0 mA 500.0 mA 3.0 A 5.0 A 3) — 0.5 5.0 50.0 500 .0 5 000.0 mA mA mA mA mA 20 V 50 V 100 V 150 V 250 V 250 V 300 V 500 V loadable up to — — 25 V 2) 50 V 2) 150 V 2) 250 V 2) 300 V 2) 500 V 2) — 5.0 mA 10.0 mA 70.
Mechanical Design Scale length Dimensions Weight Protection type IP XY (1st digit X) 0 1 2 3 4 5 6 24 A, V – 0 ... 5.0: approx. 83 mm A, V – 0 ...15.8: approx. 77 mm A, V 0 ... 5.0: approx. 67 mm A, V 0 ... 15.8: approx. 59 mm Ω ∞ ... 0: approx. 52 mm dB – 15 ... +6: approx. 42 mm 92 x 126 x 45 mm approx. 0.
6 Maintenace 6.1 Battery The state of the battery should be checked from time to time. A discharged or decomposing battery should not be left inside the instrument. The battery should be checked and changed in the manner described in chapter 4.2. 6.2 Housing No special maintenance is required for the housing. Keep outside surfaces clean. Use a slightly dampened cloth for cleaning. Avoid the use of cleansers, abrasives or solvents. 6.
Melting Fuse F1 for the mA Range and 0.15 V Range The inserted F1 melting fuse for the measuring circuit up to 0.5 A (for METRA HIT 1A) or 1.5 A (for METRA HIT 2A) can be checked for continuity in the resistance measuring ranges, preferrably in the Ω x 1 range when removed from the instrument. If the fuse is defective, ∞ is indicated. The melting fuse blows if one of the current measuring ranges or the 0.15 V range is unduly overloaded.
7 Standard Equipment Analog multimeter without battery, without cable set 8 Repair and Replacement Parts Service DKD Calibration Lab and Rental Instrument Service When you need service, please contact: GOSSEN METRAWATT GMBH Service Center Thomas-Mann-Strasse 16-20 90471 Nürnberg • Germany Phone +49-(0)-911-8602-0 Fax +49-(0)-911-8602-253 E-Mail service@gossenmetrawatt.com This address is only valid in Germany. Please contact our representatives or subsidiaries for service in other countries.
Edited in Germany • Subject to change without notice • A pdf version is available on the Internet GOSSEN METRAWATT GMBH Thomas-Mann-Str. 16-20 90471 Nürnberg • Germany Phone +49-(0)-911-8602-0 Fax +49-(0)-911-8602-669 E-Mail info@gossenmetrawatt.com www.gossenmetrawatt.
