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GRX Quick Guide V1.0
Quick Guide – RetroSign GRX
Getting started
The GRX is operated by a touch screen, where you can use these movements: tap,
swipe, and pinch. Alternatively, use the GRX trigger button.
Turn on the instrument: Press the red power button underneath the GRX housing.
The instrument turns on in less than a minute and in 1-2 seconds from stand-by mode.
Stand-by: To activate stand-by press the red power button shortly.
Switching off: Press the red power button for a couple of seconds until ‘Power off’ is written on the
touch screen. Then tap the screen to turn off the instrument completely.
Day-to-day operation
To start preparing a measurement press at the top left corner of the GRX touch screen (or
swipe the screen from left to right) to access the main menu
Follow the steps below in your daily workflow routine and follow the instructions on the GRX screen:
→ → → →
Calibration Users Templates Series Measurements
1. Calibrate: Calibrate the instrument daily before conducting any measurements. Use the
calibration target (at the back of the angle adaptor) for verification and calibration of the
retroreflectometer. Calibration values can either be typed in by hand or scanned from the
barcode. Follow the instruction on the display.
2. Users: Create or select a user who performs the measurement.
3. Template: Create or select a template which specifies the data fields to be captured
during an inspection (retroreflection of background and legend colors). Choose between
single or multiple (2-10) shots per element, taking a photo of the object and data fields picked
from predefined fields or typed new. If single shot is chosen it will still be possible to enter
data fields but not to activate “Take picture” or automatically note if it is a background or
legend measurement. Single shot is made for fast measurements.
4. Series: Create or select an existing series based on a template. Your inspections are
automatically stored. Series is where data is stored and organized and the individual
measurements can be confirmed.
5. Measure: Conduct the measurements on-site. Press the trigger button to initiate an
inspection. For multiple shots the first step will be to confirm the series information (or modify
if required). If “Take picture” has been chosen this will be the next step followed by the
retroreflection measurements. During measurement follow the instruction on the display. For
single shots you will go directly to measure without the option of modifying entered data.
Power button
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GRX Quick Guide V1.0
For “User”, “Template” and “Series” the following actions are available:
a) Filter or find, search for a previous entry
b) Edit , edit an entry
c) Add , add a new entry
d) Delete , delete an entry
e) Select by tapping an entry
All entries and measurements are automatically stored.
Please refer to the GRX user manual for further details and additional information.
Log: Examine the data log to view your inspections. To export or delete data series, swipe the
screen from right to left on the relevant series and these icons appear:
o Export data: export the logged data to a USB stick for further data processing,
analysis and reporting on a computer.
o Delete data. Note, all measurements within the data series will be deleted.
Important guidelines
Position the GRX instrument in close contact with the elements to be inspected to get the best
data quality. Use the red ‘measurement field center indicators’ on the side and bottom of the GRX
to check you are positioning the GRX correctly.
Keep the GRX lenses free of smear and dust.
If errors are detected during a measurement or calibration sequence, a message will be displayed
on the screen. Please refer to the GRX user manual for further details.
DELTA recommends re-calibrating or changing the calibration target bi-annually. If damaged or
dirty beyond cleaning the calibration target has to be changed immediate to ensure correct
measurement results.
Safety precautions
In case of any severe error condition remove the battery immediately.
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