SOMOGYI ELECTRONIC SMA 92 Digital Multimeter Instruction Manual
- June 6, 2024
- SOMOGYI ELECTRONIC
Table of Contents
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.
Measurement limit | Resolution | Accuracy |
---|---|---|
200 mV | 0.1 mV |
±(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.
Measurement limit | Resolution | Accuracy |
---|---|---|
200 µA | 0.1 µA |
±(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.
Measurement limit | Resolution | Accuracy |
---|---|---|
2 V | 1 mV |
±(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.
Measuremen t limit | Resolution | Accuracy |
---|---|---|
200 µA | 0.1 µA |
±(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.
Measurement limit | Resolution | Accuracy |
---|---|---|
20 kHZ | 10 Hz | ±(1.5% offset +5 digits) |
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.
Function | Resolution | Measuring environment |
---|---|---|
1 mV | Measurement current: approx. 1 mA Idle voltage: approx. 1.48 V | |
The built-in buzzer will activate below 100 Ω | Idle voltage less than 500 mV |
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.
Measurement limit | Resolution | Accuracy |
---|---|---|
200 Ω | 0.1 Ω |
±(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