© 2021 Thorlabs
PM103x
Page 13
MTN023788_D02
PM103A
The PM103A has one auxiliary digital port, DIO1 , with an SMA connector.
The port can be configured as digital input or output and queried per remote control command.
The DIO1 port can be configured as trigger in and output, when reading the data in the 100
kS/s mode. The trigger function is supported by the Optical Power Monitor software. Alternat-
ively, the DIO1 port can be controlled or monitored through SCPI commands in custom made
software, as described in the document WYOA for PM103x.
3.2.12 Analog Output
PM103
The PM103 has two analog outputs, AO1 and AO2 (please see Pin assignment ).
The Analog Output ports provide the amplified photo-diode current or the pyroelectic sensor
voltage, depending on the sensor. The signal from the analog output AO1 is not wavelength- or
zero- corrected.
The signal is measurement range dependent and can be calculated to:
AO1: The AO1 (DA-15 Pin 4) delivers the amplified direct real analog signal without a Digital-
Analog-Converter (DAC). Therefore, the AO1 delivers a proportional output voltage for each
measurement range. This analog output voltage can range from -0.25 V to +2.5 V. The real
analog signal is not wavelength- or zero- corrected and offers the full bandwidth (up to 1 MHz)
without quantization error.
Note
The bandwidth is in accordance with the settings of the sensor and power meter.
AO2: The AO2 (DA-15 Pin 5) delivers a range independent voltage which is DAC controlled.
The output voltage is proportional to a configured value in V/W or V/J. This constant can be ad-
justed via the OPM software or, for custom made software, using the SCPI/driver commands in
the WYOA for PM103x. The constant can be set in the Thorlabs software OPM under the Set-
tings tab: AO2 Responsivity. The signal of the AO2 is generated with a 16-bit DAC with an up-
date rate of 1 kHz. The analog output voltage can range from -0 V to +2.5 V.
The analog signal following the DAC is of advantage when large signal dynamics are expected
because the DAC range changes and the output signal stays largely the same. Additionally, the
output signal is wavelength corrected and corrected regarding the sensor calibration data.
PM103A
The PM103A has two analog output ports with a SMA output connectors. The functions match
the function of AO1 and AO2 of the PM103 respectively.
3.2.13 Autonomous Operation to Analog Output
Power meters PM103 and PM103A can be run autonomously by simply connecting a power
supply and using one of the analog output ports . In that case, no control device is required.
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