Page 14
MTN028837-D02
PM5020 Dual-Channel Benchtop Power and Energy Meter
Chapter 4 Operating Instructions
Output:
High level is 3.3 V; the maximum source current is 10 mA per pin.
Alt function:
a.
CH1/2 disable AN OUT
: Internally pulled up to high level by resistor to 3.3 V. Connect the pin to
ground to activate the function. This function disables the analog outputs when set to low level. If
the input is left open, the analog output works normally.
b.
Trigger Out
: A trigger can be sent to the PM5020. Please see chapter
c.
Shutter control
: To send a signal to a connected shutter.
d.
Shutter monitor
: To monitor the state of the shutter and coordinate a signal.
e.
Logging control
: To start/stop logging upon an incoming signal.
f.
Logging monitor
: To monitor logging and send a signal to an outside device.
4.7 Trigger
Measurements can be triggered either as an
with the trigger signal set in the touch screen,
or as an
via the auxiliary port on the PM5020 power meter front side or the Digital I/O con-
nector.
4.7.1 Internal Trigger
Measurements can be triggered with the internal trigger function for signal above a level set in the touch
screen.
This internal trigger function is useful when, for example, using a pulsed laser to only acquire signal above
a set trigger level. Whenever that level is reached, only the signal to be used will be in the displayed mea-
surement result.
Set the internal trigger signal by changing from the icon
to the icons:
"Top-Mode": A measurement is activated and upon reaching the set trigger level, the PM5020
awaits the signal plateau. The displayed measurement value represents the roof of a laser pulse and is the
best choice for square signal modulated laser sources. A valid trigger condition is indicated by the yellow
marked "T" in the sensor header. When the signal returns to below the trigger level, this lower signal will
not be displayed.
or
"Peak-Mode": A measurement is activated and upon exceeding the set trigger level, the PM5020
power meter awaits a peak. When the maximum is reached, this signal will be displayed. When the signal
returns to below the trigger level, this lower signal will not be displayed. The peak mode should be used for
short pulses, sinusoidal modulated signals, or when wanting to detect overshoots. A valid trigger condition
is indicated by the yellow marked "T" in the sensor header.
Once "TOP" or "PEAK" have been selected, the trigger level can be set directly via the side panel under the
icon
Settings Menu - MEASURE - Channel X - Trigger
.
