Beha-Amprobe MT204-S Manual Del Usuario página 26

Residual voltage / Discharge time measurement
(U , t
RES RES function
• What are residual voltages? Residual voltages are such voltages that exist
even after switch off a machine or a device. This can be caused e.g. by
built in capacitors or subsequent generators. This measurement is
performed using the function "U
• According to EN 60204-1, accessible live parts connected to dangerous
voltage must discharge within 5 seconds (permanently connected
machines) or within 1 second (plugged-in machines) down to 60 V. Proof
of this must be given through tests.
• In the event of non-compliance, additional measures (discharge devices,
warning information, covers etc.) according to EN 60204-1 must be taken.
• With the Machinery-Tester MT 204-S the residual voltage can be
measured 1 s or 5 s after switching off tested machine. Measurement of
residual voltage can be carried out in linear or non-linear mode, see the
section Residual voltage "Linear mode" or section Residual voltage "Non-
linear mode".
1) Set the measurement function selector (5) to U
2) Use the "F: t" / "F: U
function (Residual voltage or Discharge time).
3) In Residual voltage function use the "MODE" menu key (14) to
select measurement mode "LIN" or "UNLIN" and "TIME" menu
key to select measuring time (1 s or 5 s).
4) In Discharge time function use the "LIM" menu key (14) to select
the limit value for discharge time (1s or 5 s).
5) Connect test probes (or crocodile clips) to the unit under
select the accessible points where the residual voltage can cause
danger (mains connection, touchable contacts, capacitors, active
conductors etc.)
6) Start the measurement by pressing the "START/STOP" button (7).
7) Pilot lamp "ON" (8) indicates active measurement.
8) Turn on main ON/OFF switch on tested machine, the value of
present voltage appears on the LC-Display. Once the voltage is
stabilized "READY" mark appears on the LC-Display.
9) Turn off main ON/OFF switch on tested machine and wait
measurement result to be displayed (Residual voltage or Discharge
time), pay attention to corresponding limit values.
)
, t
RES RES
" menu key (14) to select the measurement
RES
26
".
position.
RES
test,