32
GMC-I Gossen-Metrawatt GmbH
17
Counting Events and Zero Crossings
These functions can be activated in the V
and V~ rotary
switch positions.
Note!
☞
Automatic shut-off
is
not active
in this functional
mode.
17.1
Event Counting
The following can be measured and displayed:
• Number of events
An event is counted if the measurement value lies below
the lower threshold L-trig for at least 1 second,
and
sub-
sequently for at least 1 second above the upper thresh-
old H-trig. Voltage signals with a repetition frequency of
maximum 0.5 Hz are recorded (minimum period:
2 seconds).
• Total time of all events
Time, during which the measured voltage was above the
upper threshold.
• Overall time since start of event counting.
➭
First enter the upper and lower thresholds as digits (see
examples in the table below, as well as Chapter 23 „Set-
ting the Measurement Parameters“):
SEt
↵
V
triG
↵
V
EVENTS
↵
H-triG
↵
XXXXXX
VU
↵
L-triG XXXXXX
VU
↵
.
➭
Set the rotary switch to V
or V~.
➭
Manually select the measuring range for event counting.
➭
Apply the signal in the same fashion as for voltage mea-
surement.
➭
Repeatedly press the multifunction key
ESC|FUNC
until
EVENTS appears at the display.
Example Entries for Trigger Thresholds
Value: trigger threshold H-trig or L-trig in digits
200 000
1)
1)
Values of up to 300 000 digits (for H-trig) are reasonable
for measuring ranges from 300 mV to 300 V.
020 000
002 000
Measuring Range
Effective Trigger Threshold
300 mV
200 mV
20 mV
2 mV
3 V
2 V
200 mV
20 mV
30 V
20 V
2 V
200 mV
300 V
200 V
20 V
2 V
600 V
2)
2)
Values of up to 60 000 digits (for H-trig) are reasonable for the 600 V mea-
suring range, because a trigger threshold of 600 V results from this maxi-
mum value, which corresponds with the measuring range upper limit.
200 V
20 V
