Saelig Saker-MV ISOVP probe |  Automation world

Saelig Saker-MV ISOVP probe | Automation world

Saelig Company, Inc. announces the availability of the Saker-MV ISOVP Probe, a new voltage probe that enables isolated high-voltage measurements over fiber optic cables. Fiber optic isolation provides high voltage safety and increased signal integrity due to the absence of interference induced by external fields. This also allows for much higher common mode rejection than conventional differential probes. The probe head can be put into standby remotely or even turned off, for increased user safety and battery power savings. The user therefore does not need to reach potentially hazardous high voltage areas to shut down the equipment when no measurements are required. Up to 15m of fiber cable can be installed between the probe head and the receiver. The probe head uses standard 1.5V AA batteries, with LEDs to indicate low battery conditions.

The ISOVP probe has been designed with minimal input capacity to allow for high frequency measurements. Typical analog optical connections are subject to slight variations in power due to misalignments of the connectors, temperature drifts and offset. The Saker-MV probe uses a proprietary algorithm to calibrate the link and eliminate those errors. This increases overall accuracy compared to other optical equipment and saves setup time.

The ISOVP probe can perform “hot” calibrations without disconnecting the input, making access to the high voltage area unnecessary during operation. This means time savings and greater safety for the user. Another useful feature puts the probe system on standby or turns off the probe head from the receiver so that the user does not need to access areas that may be at high voltage during testing. Most high-end oscilloscopes are equipped with proprietary input connectors which force the user to choose accessories provided by the oscilloscope manufacturer, however the ISOVP probe can be used with any oscilloscope with 50 Ohm termination. This gives developers the freedom to use their preferred digital domain and keep overall investment costs down. The probe head is equipped with a standard thread for mounting the camera tripod. This makes it more convenient to place the probe inside close-together cabinets or power modules to maintain adequate safety distances.

Floating measurements have become an important part of modern power electronics and the design of switching elements for IGBTs, MosFETs, thyristors, etc. Gate voltages need to be measured, and modern topologies usually stack these semiconductors to handle higher voltages. Differential probes have been the mainstay in measuring fluctuating voltages. However, they are not truly isolated devices as their bandwidth is small and common mode rejection is limited by both high frequency signals and sources with mismatched impedance. They are often noisy and unsuitable for measuring even low voltages.


  • Low input capacity
  • Hot gain and zero auto calibration
  • Low noise
  • 3m, 7m and 15m cables available
  • Up to 175MHz BW, 200MHz @ -4dB typical
  • Remote standby and shutdown
  • Camera-type mounting thread on the probe head
  • Works with standard AA batteries;

Applications include: power electronics, multilevel power inverter (CHB, NPC, FC), EMC / ESD measurements, floating sensor outputs, differential measurements, partial discharge measurements, high voltage search, wind and electrical systems, etc. Made in Spain by Saker-MV, a specialized probe manufacturer. It is now available from Saelig Company, Inc., technical distributor for Saker-MV.

Leave a Comment

Your email address will not be published.