02/ 2011
BENNING ST 720
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- Switch the tester off.
- Remove all connecting cables from the object.
9.1 Securing the instrument
Under certain circumstances safe operation of the BENNING ST 720 is no longer ensured, for
example in the case of:
- Visible damage of the casing.
- Incorrect measurement results.
- Recognisable consequences of prolonged storage under improper conditions.
- Recognisable consequences of extraordinary transportation stress.
In such cases the BENNING ST 720 must be switched off immediately, disconnected from the
measuring points and secured to prevent further utilisation.
9.2 Cleaning
Clean the exterior of the housing with a clean dry cloth (exception: special cleaning wipers).
Avoid using solvents and/ or scouring agents for cleaning the instrument. It is important to make
sure that the battery compartment and battery contacts are not contaminated by leaking elec-
trolyte.
If electrolyte contamination or white deposits occur in the area of the batteries or battery com-
partment, clean them too with a dry cloth.
9.3 Battery replacement
Before opening the BENNING ST 720, make sure that it is free of voltage!
Electrical danger!
The BENNING ST 720 is supplied by means of six 1.5 V batteries/ type AA (IEC LR6).
A battery replacement (see Figure 9) is required, if the battery symbol appears on the display
unit
8
.
Proceed as follows to replace the batteries:
- Switch the BENNING ST 720 off.
- Put the BENNING ST 720 face down and unscrew the screw of the battery compartment cover.
- Lift off the battery compartment cover (in the area of the housing slots) from the bottom part
of the battery compartment.
- Remove the discharged batteries from the battery compartment.
- Then, insert the new batteries into the battery compartment at the provided places (please
observe correct polarity of the batteries).
- Lock the battery compartment cover into place on the bottom part and tighten the screw.
See figure 9:
Battery/ fuse replacement
Make your contribution to environmental protection! Do not dispose of
discharged batteries in the household garbage. Instead, take them to a
collecting point for discharged batteries and special waste material. Please
inform yourself in your community.
9.4 Fuse replacement
Before opening the BENNING ST 720, make sure that it is free of voltage!
Electrical danger!
The BENNING ST 720 is protected against overload by means of two built-in fuses (16 A, 250 V,
F, D = 5 mm, L = 20 mm) (10019440).
Proceed as follows to replace the fuse (see Figure 9):
- Switch the BENNING ST 720 off.
- Put the BENNING ST 720 face down and unscrew the screw of the battery compartment cover.
- Lift off the battery compartment cover (in the area of the housing slots) from the bottom part
of the battery compartment.
- Laterally lift one side of the defective fuse off the fuse holder by means of a slotted screwdriver.
- Completely remove the defective fuse from the fuse holder.
- Insert the new fuse. Only use fuses of the same nominal current, nominal voltage, nominal
breaking capacity, tripping characteristic and dimensions.
- Lock the battery compartment cover into place on the bottom part and tighten the screw.
See figure 9:
Battery/ fuse replacement
9.5 Calibration
To maintain the specified accuracy of the measurement results, the instrument must be recali
-
brated at regular intervals by our factory service. We recommend a recalibration interval of one
year. Send the appliance to the following address:
BENNING Elektrotechnik & Elektronik GmbH & Co. KG
Service Centre
Robert-Bosch-Str. 20
D - 46397 Bocholt