Gossen MetraWatt PROFITEST PRIME Operating Instructions Manual page 105

16 U – RESIDUAL VOLTAGE MEASUREMENT
RES
EN 60204 specifies that after switching supply power off, re-
sidual voltage must drop to a value of 60 V or less within 5
seconds at all accessible, active components of a machine
to which a voltage of greater than 60 V is applied during op-
eration. Discharge time after exposing conductors is 1 sec-
ond.
Testing for the absence of voltage is performed as follows
with the measuring/test instrument by means of a voltage
measurement which involves the measurement of discharge
time:
In the case of voltage dips of greater than 5% of momentary
line voltage (within 0.7 seconds), the stopwatch is started
and momentary undervoltage is displayed as U
seconds and indicated by the red UL/RL LED.
The function is ended after 30 seconds, after which U
t data can be deleted and the function can thus be restarted
u
by pressing the ESC key.
16.1 GENERAL
Measuring Method
Time is measured from shutdown of supply power until a
voltage threshold is fallen short of.
Measurement is started in the case of voltage dips of more
than 5% within 0.7 s.
Select Measuring Function
Ures
Parameters
Limits – setting the limit values:
The Limits submenu offers the option of configuring the limit
values for voltage threshold and discharge time. If the mea-
sured voltage value is greater than the selected voltage
threshold when the discharge time limit has been reached,
the UL/RL LED lights up red.
U
Limit value:
U > U with limit value t
LIM
U / R
L L
Re
PROFITEST PRIME / PROFITEST PRIME AC
after 5
res
:
u
16.2 URES MEASUREMENT
Connection
Probe 1(L)
Probe 3(PE)
Measurement is continuously
active, i.e. voltage dips are
and
res
automatically detected with-
out pressing a key.
The following measured val-
ues are displayed:
U: momentary voltage at

the test probes
U : residual voltage

res
t : discharge time

u
f: frequency of the measured voltage

If the voltage threshold is not fallen short of, residual voltage
is measured no later than after the selected time has
elapsed.
Measurement is ended after 30 s in the event of an error.
Measured values are reset with subsequent restart and
aborting of the measurement takes place after pressing the
ESC key.
The measured value can be saved via softkey after measure-
ment has been performed.
URES – RESIDUAL VOLTAGE MEASUREMENT
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