SOMOGYI ELECTRONIC SMA 92 Digital Multimeter Instruction Manual

SOMOGYI ELECTRONIC SMA 92 Digital Multimeter

DIGITAL MULTIMETER

OVERVIEW

figure 1

This digital multimeter was designed with a view to comply with the safety requirements of standard EN 61010-1. Compliant with the 600 V CAT III measurement category. Before using this instrument, please read the instruction manual and observe the relevant safety precautions.
CAT IV: Measurements on low voltage power sources. For example, consumption meters, input cabinets, primary surge protection devices.
CAT III: Measurements inside buildings or plants. For example, fixed equipment, distribution panel, cabling, bus bars, switches, surge protection distribution box, etc. CAT II: Measurements on circuits that are directly connected to low voltage circuits. For example, measurements on household appliances, portable devices and similar equipment.
CAT I: Measurements on electric circuits that are not directly connected to mains.

Warning! These operating instructions contain the information and warnings required for the safe use and maintenance of the unit. Read and understand the instructions for use before using the device. Failure to understand the instructions or observe the warnings can result in serious personal injury or property damage. For your safety, please use the probe cable included with the multimeter. Before use, please check that your multimeter is intact and serviceable.
Important warning Read the contents of the instruction manual.
alternating current
direct current
grounding
double grounding (Contact protection class II)
fuse protected. Please replace according to the instructions for use.

MAINTENANCE

In order to split the outer shell of the multimeter or remove the battery compartment first unplug the probe cable. Before opening the multimeter, remove the battery and check that there is no static electricity charge pre- sent to ensure that the multimeter’s components are not damaged. Before opening the multimeter, you should be aware that dangerous voltage may be present in some of the capacitors even if the device is switched off. The calibration, maintenance and servicing of the multimeter should only be performed by a specialist who is completely familiar with the operation of the multimeter and the shock hazard involved. If not planning to use the multimeter for an extended period of time, please remove the battery and avoid storing the unit in excessively warm or humid environments. If necessary, replace the fuse with one matching the parameters below: F1: 5×20 mm, F 250 mA / 600 V
F2: 6×30 mm, F10 A / 600 V
Do not use any abrasives or solvents on the device. Only use a damp cloth or mild detergent for cleaning the unit.

DURING USE

• If the unit is used near strong electromagnetic interference, please note that the multimeter’s operation can become unstable or it may indicate malfunction.
• Never exceed the safety limits which are specified in the instructions for each measurement range.
• Never use the unit without its rear panel fully attached.
• Remove from circuit and discharge the high voltage capacitors before measuring resistance, interruption, diodes or capacity.
• Be very careful when working with bare cables or bus bars.
• If any irregular operation is detected on the multimeter, immediately switch it off and have it serviced.
• If the value to be measured is unknown, check the highest possible measurement range on the multimeter, or whenever possible, select the automatic measurement range mode.
• Before turning the limit selection switch, disconnect the probe cable from the measurement circuit.
• Never perform resistance or interruption measurements on energized circuits.
• When performing measurements on TV sets or circuits with high AC, always remember that there might be high amplitude voltage on the test points, which can damage the multimeter.
• If the voltage to be tested exceeds the effective value of 60 V DC or 30 V AC, work carefully in order to avoid sustaining an electric shock.• If the battery symbol appears on the display, the battery must be replaced immediately. Low battery voltage may result in measurement errors, electric shock, or even injury.
• Keep your fingers away from the connecting sockets.
• Do not use the multimeter in the presence of flammable gas, vapours or dust.
• Before each use, check the unit in order to ensure proper operation (e.g., using a known voltage source).
• When performing CAT II and CAT III voltage measurements, the voltage may not exceed 600 V, respectively.

GENERAL DESCRIPTION

This instrument features a 3½ digit, 7-segment display. It can be used to measure direct current, alternating current, DC voltage, AC voltage, resistance, frequency, diodes and interruption. Capable of saving the maximum value measured, has background illumination, and automatically switches measurement ranges. The reading can be saved on the display. Switches off automatically.

DISPLAY SYMBOLS

PUSHBUTTONS
FUNC If more than one secondary function is available at any given dial setting, this pushbutton can be used to toggle them. Each push of the button shifts to the next function.

MAX Pressing this button will store the highest value measured during measurement on the display. This is also indicated by a MAX symbol. Pressing the button again will clear all data, and the multimeter will exit the function. Note: The actual value is not the peak value.

HOLD Pressing this button will store the measured reading on the display. Pressing the button again or changing functions will cause the instrument to clear the data.
Backlight: Keep the button pressed for 1 second.

Input sockets
COM Common (COM) socket for all quantities to be measured (negative) voltage, resistance, current, frequency, and diode tester input (positive) 10A Current (200 mA – 10 A) input (positive)

FEATURES
Battery saver function
In order to conserve power, the multimeter automatically switches off after approx. 15 minutes if no measurement is performed or function is changed. This is indicated by 5 short beeps 1 minute before switching off then the unit switches off with a beep.

DC voltage measurement ( V)
Connect the red probe cable to the socket, and the black one to the “COM” socket. Set the dial to the DC voltage position. Connect the measurement probes to the circuit to be measured.
Note: The reading can be unstable, especially in the 200 mV measurement range, if the probe cable is not connected to the circuit being measured.

±(0.5% offset + 2 digits)

2 V| 1 mV
20 V| 10 mV
200 V| 100 mV
600 V| 1 V| ±(0.8% offset + 2 digits)

Overload protection: Use of air-gap (for volt-ages over 1500 V)

DC measurement (μA mA A )
Connect the black probe cable to the “COM” socket. Connect the red probe cable and set the selector dial according to the current values to be measured:

Current to be measured| Red probe cable connection (socket)| Dial setting
---|---|---
0 – 2 mA| VΩ Hz

mAμA

| μ A
2 – 200 mA| VΩ Hz

mAμA

| mA
0.2 – 10 A| 10 A| A

Use the “FUNC” pushbutton to set the (DC) function. Interrupt the circuit whose current is to be measured then connect the probe to the points to be measured.

±(1.2% offset +3 digits)

2 mA| 1 µA
20 mA| 10 µA
200 mA| 100 µA
10 A| 10 mA| ±(2.0% offset +5 digits)

Overload protection: an F250 mA / 600 V fuse at the mAμAVΩ Hz socket and an F10 A/600 V fuse at the “10A” socket. Max input current:
socket: 250 mA DC or AC RMS; at “10A” socket: 10 A DC or AC RMS.
If the measured current is greater than 5 A, the duration of continuous measurement should not exceed 10 seconds, and at least 5 minute should elapse between two measurements.

Measurement of AC voltage ( V)
Connect the red probe cable to the socket, and the black one to the “COM” socket.
Set the dial to the AC voltage position. Connect the measurement probes to the circuit to be measured.
Note: The reading can be unstable, especially in the 200 mV measurement range, if the probe cable is not connected to the circuit being measured.

±(1% offset + 3 digits)

20 V| 10 mV
200 V| 100 mV
600 V| 1 V| ±(1.2% offset + 3 digits)

Overload protection: Use of air-gap (for volt-ages over 1500 V)

Measuring range: 40 Hz- 200 Hz
Measurement of AC (μA mA A ) Connect the black probe cable to the “COM” socket. Connect the red probe cable and set the selector dial according to the current values to be measured:

Current to be measured| Red probe cable connection (socket)| Dial setting
---|---|---
0 – 2 mA| VΩ Hz

mAμA

| μ A
2 – 200 mA| VΩ Hz

mAμA

| mA
0.2 – 10 A| 10 A| A

Use the “FUNC” pushbutton to set the AC (AC ) function. Interrupt the circuit whose current is to be measured then connect the probe to the points to be measured.

±(2.5% offset + 5 digits)

2 mA| 1 µA
20 mA| 10 µA
200 mA| 100 µA
10 A| 10 mA

Overload protection: an F250 mA / 600 V fuse at the mAμAVΩ Hz socket and an F10 A/600 V fuse at the “10A” socket. Max input current:
socket: 250 mA DC or AC RMS; at “10A” socket: 10 A DC or AC RMS. If the measured current is greater than 5 A, the duration of continuous measurement should not exceed 10 seconds, and at least 5 minute should elapse between two measurements. Measuring range: 40 Hz – 400 Hz

Frequency measurement
Connect the red probe cable to the socket, and the black one to the “COM” socket. Set the dial to the “Hz” function. Connect the measurement probe to the circuit to be measured.

Input signal level: min. 500 mV

Diode and interruption testing
Diode testing: Connect the red probe cable to the socket, and the black one to the “COM” socket (the red probe is for “+” polarity). Set the dial to the position. Use the “FUNC” pushbutton to set the diode testing ( ) function. Connect the red probe cable to diode’s anode, and the black one to its cathode. The display will show the diode’s approximate forward voltage. If the connection is reversed, “OL” will appear in the display. Interruption testing: Connect the red probe cable to the mAμAVΩ Hz socket, and the black one to the “COM” socket. Set the dial to the position. Use the “FUNC” pushbutton to set the interruption testing ( ) function. Connect the measurement probe to the circuit to be tested. If the circuit is connected to a power source, switch of the power source and discharge the capacitors before starting measurement. Short-circuits (less than 100 Ω) will be indicated by the built-in buzzer.

Resistance measurement (Ω)
Connect the red probe cable to the socket, and the black one to the “COM” socket. (The red probe cable is “+” polarity). Set the dial to the “Ω” position. If the resistor to be measured is connected to a circuit,switch of the power source and discharge the capacitors before starting measurement.

±(0.8% offset + 2 digits)

2 kΩ| 1 Ω
20 kΩ| 10 Ω
200 kΩ| 100 Ω
2 MΩ| 1 kΩ|

±(1.0% offset + 2 digits)

20 MΩ| 10 kΩ

BATTERY AND FUSE REPLACEMENT If the “ “ icon appears on the display, the batteries require replacing. The fuse only needs to be replaced rarely due to errors associated with use. Prior top replacing the battery/fuse, turn off the instrument and unplug the probe cables. For battery replacement, use a screwdriver to remove the screw from the rear panel. For fuse replacement first remove the instrument from its case then remove the screws from the rear panel. Replace the battery/fuse. Observe the correct polarity. Replace the cover and tighten the screws.
Warning: Before opening the instrument, make sure that the probe cable has been removed from the measuring circuit. Replace and tighten the screws so that the device operates in a stable manner during use and accident hazards are avoided.

ACCESSORIES

• instructions for Use probe cable
• 9 V (6F22) battery
• case

DISPOSAL

Waste equipment must be collected and disposed separately from household waste because it may contain components hazardous to the environment or health. Used or waste equipment may be dropped off free of charge at the point of sale, or at any distributor which sells equipment of identical nature and function. Dispose of product at a facility specializing in the collection of electronic waste. By doing so, you will protect the environment as well as the health of others and yourself. If you have any questions, contact the local waste management organization. We shall undertake the tasks pertinent to the manufacturer as prescribed in the relevant regulations and shall bear any associated costs arising.

DISPOSING OFALKALINEAND RECHARGEABLE BATTERIES

Batteries, whether alkaline or rechargeable, must not be handled together with regular household waste. It is the legal obligation of the product’s user to dispose of batteries at a nearby collection center or at a retail shop. This ensures that the batteries are ultimately neutralized in an environment- friendly way.

SPECIFICATIONS

• measurement category: CAT III 600 V
• fuses: 5×20 mm, F 250 mA / 600 V quick blow; 5×20 mm, F 10 A / 600 V quick blow
• ambient temperature and humidity: 0 – 40 °C (<80% relative humidity)
• display: 3 1/2 digit LCD display
• overload protection: PTC protection (in resistance and frequency measurement)
• power supply: 9 V (6F22) battery
• reading over measurement limit: “OL” appears in the display window.
• polarity indication: “-” is displayed for negative polarity.
• exhausted battery: “ “ icon appears on the display.
• dimensions: 140 mm x 67 mm x 30 mm
• weight: approx. 112 g

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