© 2019 Thorlabs
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PM101x
4.3 Pin Assignment of the Sensor Connector
The sensor connector allows the access of all Thorlabs “C-type" photodiode and thermal power
sensors. The power meter intrface uses the sensor calibration data, stored in the sensor con-
nector, to calculate the corresponding actual power levels.
Additionally, the PM101x is capable to support custom made detectors. Please read the follow-
ing instruction prior to connecting a self made sensor.
Warning
Pin 2 is uniquely used for the EEPROM Digital I/O (memory in Thorlabs sensor heads) and
MUST NOT be used. Connecting this Pin may cause malfunction of the PM101x.
Pin-out of the DE-9 female
connector (female)
Pin
Function
Description
1
Power Supply
+5 V; Max Current 100 mA from this Pin
2
EEPROM
Sensor Memory for the Calibration Data
3
AGND
Analog Ground for Photodiode Anode, Thermal Sensor , NTC
4
PD -
Photodiode Cathode Input
5
N.C.
Not Connected
6
DGND
Digital Ground for EEPROM and 5V Output
7
PRESENT
Connect via a 1k
W
– 10k
W
Resistor to Pin 3 (AGND) to Enable a
Custom Sensor
8
TH+
Thermal Sensor Input
9
N.C.
Not Connected
4.4 Safety
Attention
The safety of any system incorporating the equipment is the responsibility of the assembler of
the system.
All statements regarding safety of operation and technical data in this instruction manual will
only apply when the unit is operated correctly as it was designed for.
The PM101x must not be operated in explosion endangered environments!
Only with written consent from Thorlabs may changes to single components be made or com-
ponents not supplied by Thorlabs be used.
All modules including control inputs / outputs and the sensor must be connected with duly shiel-
ded connection cables.
