THORLABS PM100A Manuel utilisateur

Quick Reference

Thorlabs Instrumentation

Optical Power Meter

PM100A

2009

Safety

Attention 

All statements regarding safety of operation and technical data in

the instruction manual will only apply when the unit is operated

corectly.

The power meter PM100A must not be operated in explosion

endangered environments!

Sensor, photodiode and control inputs and outputs must only be

connected with duly shielded connection cables.

Only with written consent from Thorlabs may changes to single

components be carried out or components not supplied by

Thorlabs be used.

Do not remove covers!

Refer servicing to qualified personal!

Table of Content

1General Information 3

2Getting Started 3

2.1Unpacking 3

2.2Preparation 3

2.3Physical Overview 4

3Operation 7

3.1Connecting a Power Sensor 7

3.2Controlling the PM100A 7

3.2.1Navigating the Menus 7

3.2.2System Settings 7

3.2.3Power Measurement 8

3.2.4Analog Output 11

3.2.5Battery Charging 11

3.3Computer Interface 11

4Addresses 12

1 General Information

The PM100A Handheld Optical Power Meter is designed to measure the radiant

power of laser light or other monochromatic or near monochromatic light sources.

The space-saving, battery powered design and compatibility to all Thorlabs ‘C-

Series’ photodiode and thermal sensors, and custom photodiode and thermal

detectors, featured with a fast USB device interface open a wide range of

applications in Manufacturing, Quality Control, Quality Assurance, and R&D for

stationary and field use. The unit combines a precise 4 digit power readout with a

high sensitive mechanical analog needle meter to perform laser tuning tasks or

watching trends.

Please refer to the user manual on the data carrier supplied with the unit for

detailed function description.

2 Getting Started

2.1 Unpacking

Inspect the shipping container for damage.

If the shipping container seems to be damaged, keep it until you have inspected

the contents and you have inspected the PM100A mechanically and electrically.

Verify that you have received the following items within the hard-case:

1. PM100A power meter console

2. Plug-In power supply with Interchangeable primary plug for USA, UK,

Europe, and Australia

3. USB cable, type ‘A’ to ‘mini-B’

4. Quick-start guide

5. USB memory stick with instrument drivers, user application and operation

manual

6. Certificate of Calibration

2.2 Preparation

Configure the plug-in power supply with the primary plug for your local power

supply.

Connect a suitable power sensor. The sensors have a self-fixing mechanism. To

plug or unplug sensors slightly press from both sides on the brass pins in the

connector housing.

Turn the unit on by pressing the power button in the side panel.

After switching on the unit, the needle deflects to full scale and the graphics display

shows the device status and then jumps to the last measurement screen prior

powering down.

The PM100A is immediately ready to use after turning on.

2.3 Physical Overview

Analog Meter Needle Zero Adjust Graphics Display

(Switch off unit prior to adjusting!)

Figure 1 Front Panel

On/Off Switch USB Connector Sensor Connector (DB9 female)

Figure 2 Side Panel

DC Input (Charger) Analog Output (SMA)

Fuction Keys:

Navigation: TSWX

Enter/Edit: OK

Wavelength: λ

Relative Measure: Δ

Backlight: 

Pull here to lift the support Removable protective

rubber boot

Figure 3 Rear View

Mounting Thread 1/4“-20

Figure 4 Bottom View

Operation Overview Standard View:

Function

Menu Key

Item

OK WXST

R _.___ _W Auto set Meas. Range Range Down Range Up

S _.___ _W Auto set Needle Scale Zoom In Scale Zoom Out Scale Browse

ZERO Perform Zeroing (No Function) Menu

TUNE ;Tune Sound On/Off Reset Maximum Power Value Items

MENU Enter/Exit System Menu Switch to Statistics View

Operation Overview Statistics View:

Function

Menu Key

Item

OK WXST

R _.___ _W Auto set Meas. Range Range Down Range Up

S _.___ _W Auto set Needle Scale Zoom In Scale Zoom Out Scale Browse

HOLD / RUN Hold / Run Statistics Reset Statistics Values Menu

TUNE ;Tune Sound On/Off Reset Statistics Values Items

MENU Enter/Exit System Menu Switch to Standard View

Figure 5 Display Setup

Operating

Wavelength

Menu Items (Soft Buttons)

4 digit Power Readout

with Units

Power Range

Setting

Power Scale

Setting

Delta Power

Scale

Power Scales

Information, Status and

Warning Indicators

3 Operation

3.1 Connecting a Power Sensor

The PM100A supports all Thorlabs ‘C-Series’ photodiode and thermal power

sensors. These can easily identified against older versions of Thorlabs power or

energy sensors by their red connector housing. The console will not recognize

sensors from the ‘A’ and ‘B’ series. Please contact Thorlabs for the upgrade of old

sensors with ‘C-Series’ connectors.

To plug or remove a sensor slightly press on the two bolts in the connector

housing, that fix it by resilience. Sensors can be ‘hot-swapped’ to the console, after

recognizing a new valid sensor the type and calibration data will be downloaded to

the console in approximately 2 seconds, and the unit is ready to operate with the

new sensor.

3.2 Controlling the PM100A

3.2.1 Navigating the Menus

The measurement screens contain of five menu items (soft buttons) that are

arranged in a column in the right of the graphics display. These can be navigated

with the up and down (ST) keys and controlled by the left and right (WX) keys

and/or the enter/edit (OK) key

The focus is always on the button in inverse presentation .

3.2.2 System Settings

After navigating to the bottom soft button MENU and confirming it with the OK key

the system menu can be scrolled with the Sor Tkeys. To perform the initial

adjustments the settings can be edit or changed with the Wor Xkeys on ring

controls or by using all navigation keys for numeric controls.

The menu is arranged on three pages with four lines each. The items depend on

the connected sensor. To leave the system menu press the OK key or navigate

down or up to the ‘EXIT’ item and confirm with OK.

Page 1: Measurement Settings

Bandwidth Sets input bandwidth to High or Low (WX)

(only visible with connected photodiode sensor)

Accelerator Enables/disables the speed up circuit (WX)

(only visible with connected thermal sensors)

Attenuation Includes a filter or beam splitter for the power calculation.

The input is in dB. When an attenuation is set, the value is

displayed in the status indicator. (WXST)

Line Filter Sets the unit to the local line frequency 50Hz/60Hz

to avoid aliasing effects (WX)

Adapter Type Sets the PM100A into the mode to measure photo current

or thermal voltage. Please refer to the detailed user manual

for connecting a custom sensor. (WX)

Page 2: Console Settings

Interface Shows the remote status. Press Xto set the unit back to

local mode.

Backlight Sets the brightness of the LCD and key backlight.

The setting range is 0 (off) – 100% (maximum). (WXST)

Battery Timer The unit automatically powers off in battery operation after a

certain time without user action. This feature can be set to

10 or 60 minutes, or switched off. (WX)

The feature is inactive with connected external power

supply (AC adapter or USB)

Firmware Upload Needs to be set to ‘ON’ before uploading a new firmware

version. The function will automatically reset to ‘OFF’ after

powering down (WX)

Page 3: System Information

Console Information

XShows console related information. (WX)

Sensor Information

XShows information about the connected power sensor.

Tau Sets the time constant for custom thermal sensors (only

visible with connected custom thermal sensor) (WXST)

EXIT Aborts the system menu and switches back to the last

measurement screen. (OK)

3.2.3 Power Measurement

3.2.3.1 Range Control

Navigate to the topmost menu item R -.-- - W ; 6 power corresponding current or

4 power corresponding voltage ranges can be adjusted manually with the Wor X

keys. Pressing the OK key the unit performs a nonrecurring auto-ranging until the

optimum range has been found for the currently measured power level. The range

control menu item indicates the particular full range value in Watts.

A permanent auto-range mode is only available in remote operation.

3.2.3.2 Scale Control

After setting the measurement range the unit automatically selects the needle

scale, where the full power range is covered. To change the needle scale navigate

to the S -.-- - W menu item. With the Wor Xkeys the scale can be optimized to

different end scales for best readability of the power value (zoom function). This

adjustment can also be automated by pressing the OK key. The scale control

menu item indicates the particular full scale value in Watts.

The scales end have a fixed 1 – 2 – 5 grid, therefore it is possible that the full scale

range may be higher than the power range. In such a case, when the power level

is exceeding the power range, the needle will deflect to the right stop and the

readout value will indicate ‘HIGH’.

3.2.3.3 Wavelength Correction

Pressing the λkey leads to a wavelength menu with 8+1 individually configurable

sensor independent settings. The currently set operating wavelenght is indicated

by a following arrow () and has focus when entering the menu. Select the

desired operating wavelength by navigating with the STWX keys and confirming

with OK. The λkey allows to exit without changing the operating wavelength.

To preconfigure or edit a wavelength item, navigate to it and keep the OK key

pressed until the last digit gets underlined. Set the desired wavelength with the

STWX keys and confirm with OK.

When selecting a wavelength that is not applicable for the connected sensor a

warning sound will appear and the unit will keep the previous wavelength setting.

Wavelength setting in remote operation will overwrite the down to the right value.

3.2.3.4 Zeroing

Confirming the ZERO menu item with OK, the unit performs an automated zero

adjustment and from now on takes into account this zero level for the power

readout calculation. This feature is used to zeroing thermal sensors, performing

dark current adjustment on photodiode sensors or suppressing small ambient light

levels. When the initial power level is too high, a failure message will appear that is

prompting to cover the power sensor prior to zero adjustment.

When the PM100A detects “negative” power levels, additionally a ZERO! warning

will appear in the status indicator.

3.2.3.5 Tune Sound

The TUNE;menu item switches on and off an audible tone for laser tuning

support. The intermitting tone will increase its repetition rate up to a permanent

sound at the maximum reached power level. When the Tune feature is activated,

the maximum level is indicated instead of the operating wavelength. To reset the

maximum power level to the actual level press one of the Wor Xkeys.

Leaving the focus of the TUNE button or pressing OK will stop the sound.

Sound On/Off: OK

S= maximum power level Reset max level: WX

3.2.3.6 Relative Measurements

The Δkey switches on and off the relative measurement mode.

The main display will set to zero and gets signed, the offset and the absolute

power value will be displayed in two sub displays in negative presentation. The

analog needle will deflect to the middle position with bidirectional amplitude (0 at

the scale below the mirror) and change to the next sensitive scale.

P = absolute power level

P0= offset power level bidirectional needle

scale (± 100µW)

signed delta power level

3.2.3.7 Display Options

The PM100A can toggle between the standard measurement screen and a

statistics screen by navigating to the MENU item and pressing one of the Wor X

keys.

The statistics screen shows the actual, minimum, maximum and average power

level. The HOLD/RUN soft button in the display menu controls this feature. When

the item has focus, the OK button toggles between sample and run mode, in hold

mode, the device samples in the background.

The Wor Xkey resets all items to the actual power level and restarts sampling.

Ranging during the sampling is possible, though once the actual level exceeds the

measurement range, the stored and calculated values will show ‘High’.

Press.

Wor X

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