Our Selection of DMM's (Digital Multimeters)

Number of digits:

This specifies how many digits of a measurement signal can be displayed by a DMM.


The DMM shown on the left is 4½ digits with 12000 digits. It shows 4 full digits from 0-9 plus one more (here a 1). From a value of 11999 (for example, 11.999 V), the system switches automatically to the next higher measuring range (100 V).

Mean indicating DMM:

For voltage and current measurement, only pure sinusoidal signals are measured correctly. Due to today's requirements, this is no longer up-to-date. Even an electronic low-voltage transformer delivers extremely distorted sinusoidal signals on the output side. With such a DMM you get no or completely wrong values ​​displayed. Therefore, a DMM with TRMS should be used.

Where may the multimeter be used?

Printed in the instruction manual and on the Digital Multimeter (DMM), you will find information on the environment in which it can be used. The maximum permissible stresses in the ranges (measurement categories) must also be taken into account.

  • CAT I Measurements on circuits not directly connected to the grid, e.g. Batteries etc.

  • CAT II Measurements on circuits electrically connected directly to the low voltage grid. Via plug, e.g. in the household, office, laboratory ...

  • CAT III Measurements in the building installation. Stationary consumers, distribution connection, devices fixed to the distribution panel.

  • CAT IV Measurements at the source of the low voltage installation. Counter, main connection, primary over-current protection devices.

The multimeter may be used in the CAT III range up to 1000V and in the CAT IV range up to 600V.

Three bushings with patented Automatic Bushing Lock (ABS)

All current measuring ranges are routed confusingly over a single socket. The automatic socket lock also prevents incorrect connection of the test leads or the wrong choice of the measured variable. Thus, a risk to the user, the device and the test object due to incorrect operation is largely excluded.
1)  (Patent No. DE 10 2005 062 624, US Pat. No. 7,439,725)

TRMS indicating DMM and bandwidth:

This means that sinusoidal and non-sinusoidal signals are correctly measured and displayed during voltage and current measurements. Just as important as TRMS is the bandwidth! When measuring AC and AC, the frequency range of a signal is important. The example of a halogen-NV-transformer requires a multimeter whose bandwidth is greater than 24 kHz.

Current measurements> 10A::

Current measurements> 10A: Frequently, current measurements must be performed that exceed the measured value of the DMM or the live conductor may or may not be split. A current clamp must be closed at a 90 ° angle around the current-carrying conductor so that the highest measuring accuracy is achieved.

Hall effect current sensors:
for measuring DC and AC currents Important: The output of this clamp is a voltage (volts per ampere). Therefore, set the function switch to VAC + DC! In the setup menu you can set the converter factor for example 1: 1000 V / A and the measured current value will be automatically calculated and displayed.