How to Measure 5G, WiFi & RF Electromagnetic Fields with TENMARS TM-190T Malaysia
How to Measure 5G, WiFi & RF Electromagnetic Fields with TENMARS TM-190T Malaysia
WiFi networks, wireless communication equipment and RF transmitters are now common in offices, factories, commercial buildings, server rooms and other facilities across Malaysia.
When investigating electromagnetic fields around these environments, one important question is:
What type of meter should you use?
The TENMARS TM-190T is designed to measure different types of electromagnetic fields, including RF electromagnetic fields from 50 MHz to 10 GHz.
This makes it a useful instrument for technicians who need to investigate RF field levels around wireless and communication equipment.
Can the TENMARS TM-190T Measure WiFi and RF Fields?
Yes. The TM-190T includes an RF electromagnetic field measurement function covering:
50 MHz to 10 GHz
This frequency coverage allows the instrument to respond to many RF sources encountered in modern environments.
Potential applications include checking areas around:
WiFi equipment
Wireless access points
Communication equipment
RF transmitters
Antenna installations
Wireless networking equipment
Telecommunication facilities
However, it is important to understand what the instrument does.
The TM-190T is an electromagnetic field meter, not a spectrum analyser.
It measures RF electromagnetic field strength within its specified operating range. It does not identify a particular WiFi channel, mobile operator or individual RF transmission simply from the field-strength reading.
What About 5G?
The term 5G covers different frequency allocations depending on the network and country.
Therefore, when evaluating any instrument for 5G-related measurements, users should first determine the actual frequency of the RF source they want to investigate.
The TM-190T has an RF measurement range extending to 10 GHz.
If the RF source being investigated operates within the instrument's specified frequency range, the TM-190T can be used to evaluate the RF electromagnetic field present at the measurement location.
For applications requiring identification of individual frequencies, channels or RF signals, more specialised RF analysis equipment may be required.
How to Check RF Fields with the TM-190T
A practical RF investigation normally begins by establishing a reference reading.
Step 1 – Identify the Area
Determine where you want to investigate.
For example:
Near a WiFi access point
Inside a server room
Near communication equipment
Around an antenna installation
At an office workstation
Inside a factory
Near wireless networking equipment
Step 2 – Take a Reading Away from the Suspected Source
Start at a reasonable distance from the equipment.
This gives you a reference measurement that can later be compared with readings closer to the suspected RF source.
Step 3 – Move Gradually Toward the Source
Take measurements at several distances.
For example:
3 metres → 2 metres → 1 metre → closer investigation
The exact measurement procedure should depend on the application and applicable testing requirements.
Recording distance is important because electromagnetic field readings can change significantly according to measurement position.
Why Does the Reading Change When You Move the Meter?
RF field strength is strongly influenced by the location of the meter relative to the source.
Readings may change because of:
Distance from the transmitter
Antenna direction
Walls and building materials
Reflections from metal surfaces
Other RF sources
Equipment operating conditions
Measurement position
Therefore, one reading at one location may not represent the entire room.
For a more useful investigation, take measurements at several positions and record the conditions.
Checking WiFi Equipment
A common application is checking the electromagnetic environment around WiFi equipment.
For example, a technician may compare readings:
Away from the access point → near the access point → at a normal occupied position
This helps establish how the measured RF field changes according to location.
The objective is not simply to find the highest possible number.
A better approach is to understand where the field is present and how readings change with distance and position.
RF Measurement in Offices
Modern offices may contain multiple wireless sources.
These can include WiFi access points, wireless devices and communication equipment.
The TM-190T can be used during an RF field survey to compare different areas such as:
Workstations
Meeting rooms
Server rooms
Network equipment areas
Locations near wireless access points
General occupied areas
Measurements should be documented together with location and distance information whenever meaningful comparison is required.
RF Measurement in Data Centres
Data centres contain a mixture of electrical and communication infrastructure.
This is where the TM-190T becomes particularly useful because it is not limited to RF measurement alone.
The same instrument can investigate:
Low-frequency magnetic fields
AC electric fields
High-frequency RF electromagnetic fields
For facility teams, this allows different electromagnetic field categories to be investigated using one portable meter.
Do Not Confuse RF with Low-Frequency Magnetic Fields
This is one of the most important points when buying an EMF meter.
An electromagnetic field around an electrical installation is not necessarily the same type of field as that generated by wireless communication equipment.
For example:
Electrical panel / transformer / motor
→ Low-frequency electromagnetic investigation may be relevant.
WiFi / wireless transmitter / communication equipment
→ RF measurement is relevant.
The TM-190T supports both types of investigation, which is one of its main advantages over simpler single-function meters.
Why Use a 3-Axis EMF Meter?
For low-frequency magnetic-field measurements, the TM-190T incorporates three-axis measurement.
Instead of relying on a single directional axis, the instrument can evaluate magnetic-field components across multiple directions.
This is useful when the direction of the electromagnetic field is not known before testing.
Common Mistakes When Measuring RF Fields
For better measurements, avoid several common mistakes.
Holding the meter at inconsistent distances
Changing distance can significantly affect the reading.
Taking only one measurement
RF conditions can vary throughout a room.
Assuming every reading comes from one device
Multiple RF sources may be present simultaneously.
Assuming an EMF meter identifies the exact RF signal
The TM-190T measures electromagnetic field strength. It is not intended to replace specialised spectrum analysis equipment when individual signal identification is required.
Who Can Use the TENMARS TM-190T?
Typical users may include:
Electrical technicians
Facility engineers
Industrial maintenance teams
Safety personnel
Building maintenance teams
Data centre technicians
Environmental measurement personnel
RF and communication technicians
Its combination of low-frequency and RF measurement makes it especially practical for users who encounter different electromagnetic environments from site to site.
Looking for TENMARS TM-190T in Malaysia?
MTM Precision Sdn Bhd supplies TENMARS and industrial testing instruments for customers throughout Malaysia.
If you need to measure WiFi, RF electromagnetic fields, electrical equipment or workplace EMF, contact us with your application.
We can help determine whether the TENMARS TM-190T is suitable or whether a different type of instrument is required.
Contact MTM Precision
MTM Precision Sdn Bhd
Showroom & Service Centre – Puchong, Selangor, Malaysia
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
Supporting customers in Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
Contact MTM Precision for TENMARS TM-190T quotation, technical enquiries and EMF meter selection in Malaysia.
19 Sep 2026
