Correcting Malfunctions - VOLTCRAFT VC-140 Bedienungsanleitung

b) Replacement of the fuse
Ensure to use only fuses of the indicated type and
the indicated nominal current strength as a replace-
ment. The use of mended fuses or the short-circuit-
ing of the fuse holder is inadmissible.
In order to replace the area fuse of the mA current input disconnect
the measuring instrument from the measuring circuit and turn it off.
Remove all the connected cables and test probes. Take a suitable
screwdriver for recessed-head screws and open the housing of the
measuring instrument following the description in the chapter "a)
replacement of the battery". Remove the defective fuse and replace
it with a new fuse of the same type and a nominal current strength of
0,315 A quick-acting, 250 V; usual designation: F0,315A/250V or
F315mA/250V.
After replacing the fuse, close the measuring instrument carefully.
Put the measuring instrument only into operation after closing and
fastening the housing safely with screws.
c) Connection of the instrument leads
Make only use of the supplied instrument leads. Always examine the
condition of the connectors and the test probes before each
connection and make sure that the insulation is not damaged
These instrument leads have only been approved for voltages of up
to 600 V at the most. Your measuring instrument, the VC 140, has
been designed for voltages of up to 600 VDC at the most and
VACrms with galvanic separation from the network, in the overvolta-
ge category I. The utmost caution is advised when you are dealing
with voltages that exceed 25 V AC or 35 V DC.
Never exceed the max. input quantities. Otherwise
the measuring instrument may be damaged which is
dangerous to life.
30

Correcting malfunctions

With the digital multimeter VC 140 you have bought a state of the art
measuring instrument that was constructed in keeping with the
recent technological development. Nevertheless, there may arise
malfunctions. For this reason, the following chapter will give you
information on how to correct some of these malfunctions rather
easily:
Problem
No indication
Current measurement is
not possible
Always observe the safety instructions!
If coverings are opened or parts are removed,
except when this is possible by hand, live parts may
be uncovered. Connecting points may be live, too. If
the device must be opened, it must be disconnected
from all the voltage sources and measuring circuits
before a trimming, maintenance, overhauling or
replacement of parts or subassemblies takes place.
If a trimming, maintenance or repair at the open live
device is unavoidable after that, this work must be
carried out by an expert who is familiar with the
hazards involved and the relevant regulations (VDE-
0100, VDE- 0701, VDE-
0683). Capacitors in the device may still be loaded,
even if the device has been disconnected from all
the volltage sources and measuring circuits.
Possible solution
Has the device been turned-on?
Is the battery used?
Is the HOLD button still pressed?
Is the fuse for the 200 mA current
measurement range defective?
39