Question: What is the effect on results when I standardize using a smaller view than my port plate?
We do allow undersampling the view, so you can standardize in the 0.5" view and measure with either the 0.7", 1.20" or 2.0" port plates.
Please understand that their is a distinct difference between area of illumination and area of Measurement, they are never equal. Then consider that the software screens were designed by Marketing and not by Engineering. When you select the 1.75" View in the software you are specifying the area being illuminated. The port plate on which you positon your sample has an opening that is slightly larger than the illuminated area. The LabScan XE uses the following
Illumination Area / Measured Area (Port Plate opening)
1.75" / 2.00"
1.00" / 1.20"
0.50' / 0.70"
0.25" / 0.40"
The software allows you to use a larger measured area, but for opaque products this will likely cause lower L* values to be reported. Using a larger measured area is typically down when measuring translucent products to capture the lateral light diffusion inside of the sample.
CE 2013 Certification For LabScan XE is attached here.
My old LabScanXE flashed 5 times per reading and my new ColorFlexEZ only flashes once. Was my LabScanXE doing the average of five readings or averaging the signal from the 5 flashes into a single reading?
In simple terms the LabScan XE is averaging the signal from the 5 lamp Bursts into a single reading and the ColorFlex is using the signal from a single Burst of light. These bursts are of different time durations and the durations are sampled multiple times during the Analog to Digital conversion stage of the measurement. The goal is to minimize the difference that would occur when measuring the same specimen multiple times. The ColorFlex uses Annular 45a/0 optical geometry and the LabScanXE uses Circumferential 0/45c optical geometry. These optical geometries have different efficiencies requiring levels of light, hence the different Bursts needed to achieve acceptable repeatability.
Question: during inspection of my new LabScanXE it appears that the bottom corner of one side of the cover has been broken off and is missing.
Answer: You are correct that the one corner of the enclosure on the bottom of the instrument is missing. The mold used to make this instrument was damaged about 17 years ago. The decision at that time was that since this is not in a visible location. All LabScanXE's have this flaw.
The tile with the label is the Instrument Standard and is used to standardize the instrument. This tile is provided with a Certificate of Traceability and has calibrated values assigned to it.
The tile with no label is the backing tile, that can used to keep dust or debris out of the view port when the sensor is not in use, or can be used as an opaque backing for translucent samples.
HunterLab recommends that you only use the Instrument Standard white tile for standardizing the instrument then return it to the calibration accessories box. We recommend that you then use the backing white tile for all other purposes associated with your products measurements.
Question: A customer received a new LSXE and using Diagnostics found that it has 1,100,000 flashes, they think that is too much for a brand new sensor.
We test all instruments after we build them. The customer should only be concerned if the flashes are too low, as that would indicate incomplete testing. If the flash count is high then the customer can be assured that it was fully tested.
Please explain to the customer that for a LSXE each reading consists of 5 Bursts of the lamp. A Burst is the act of ionizing and igniting the Xenon gas in the lamp. Once the Burst ignites the Xenon the gas is pulsed (flashed) from 30 to 150 times. For a new LSXE the typical Flash (pulse) setting is between 30 and 40. As the instrument ages or for a VSI as the spot size decreases the numbers of flashes will increase. The SPSP board records Flashes not Bursts. So for one single reading the sensor would produce between 150 and 200 Flashes ( 5 Bursts x 30 Flashes/Burst = 150 Flashes)
To prove this have the customer go to the Diagnostics | Hardware Checks and record the number of Flashes on paper. Then have them exit and take 6 measurements. The have them go back to the Diagnostics | Hardware Checks and record the number of flashes. Subtract the first valve from this value and divide by 6. This will be the number of flashes that the instrument records each reading. Divide this number by the total shown and that will show how many readings were taken with this sensor. When we build a sensor we test for short term repeatability, Long term repeatability, Long term drift, color tile readings during and after calibration, then we send the sensor to the QA lab where the majority of these tests are repeated. This can amount to more than 1500 readings. So 4000 readings x 5 Bursts/reading x 40 flashes/Burst can equal 800,000 flashes. If for example repeatabililty testing were re-run because we made an optical adjustment, or lamp power adjustment it is possible that a new sensor would have much more than 1 million flashes. The lamp is rated for more than 1 billion flashes so the customer should not be concerned if it has more than 1 million flashes.
FAQ: “The slot in the sample clamp on our LabScan XE has worn through. How can we fix this?
We would recommend an upgrade kit that comes with a new spring and sleeve:
A37-1010-689 LSXE Sample Clamp Spring
Used on: LSXE
Spring used in LabScan XE sample clamp.
D04-1010-440 LSXE Sample Clamp Sleeve for Spring
Used on: LabScan XE
Black anodized sleeve used to house LSXE sample clamp spring
You can easily retro-fit this upgrade in the field but unscrewing the little Phillips screw on the underside of the clamp support and re-assembling with the new parts.