A test report is only useful if it can be compared. That means the same method, the same conditioning and the same sampling position every time — otherwise you have a series of unrelated numbers.
The minimum set
| Test | Method | Acceptance |
|---|---|---|
| Operation noise | 1 m, anechoic or quiet room | <= 35 dB |
| Cycle endurance | 1000 cycles with load | position drift <= 2 mm |
| Torque and current | full load | within motor curve |
| Battery cycles | 300 cycles | >= 80 % capacity retained |
| Protocol conformance | certification test | pass for declared protocol |
| IP rating | IEC 60529 | IP44 for bathroom use |
Why each test earns its place
Operation noise. Run to 1 m, anechoic or quiet room, acceptance <= 35 dB. This is the test that answers the question the buyer will ask first, and the one where a supplier is most likely to send a development sample rather than production material.
Cycle endurance. Run to 1000 cycles with load, acceptance position drift <= 2 mm. This is the test that answers the question the buyer will ask first, and the one where a supplier is most likely to send a development sample rather than production material.
Torque and current. Run to full load, acceptance within motor curve. This is the test that answers the question the buyer will ask first, and the one where a supplier is most likely to send a development sample rather than production material.
Battery cycles. Run to 300 cycles, acceptance >= 80 % capacity retained. This is the test that answers the question the buyer will ask first, and the one where a supplier is most likely to send a development sample rather than production material.
Sampling for motorised blinds, and where it goes wrong
A single sample from the top of a roll tells you about the top of that roll. For a first order of motorised blinds, take three positions along the run and one sample per colour, then test operation noise on all of them rather than on a composite.
Condition the samples before testing. Several motorised blinds results move by 10-20 % between a dry laboratory and a humid one, which is why two labs can disagree on the same material without either being wrong.
Reading a motorised blinds report properly
- The measured value for operation noise, not only the verdict. A pass at <= 35 dB is a risk, not a comfort.
- The method number for cycle endurance, not the description. A trade name is not a method.
- Conditioning and duration, because both change several results in this family.
- Sampling position and lot number, so the result can be tied to the cartons you received.
- The laboratory name and its accreditation, if the report may be used in a dispute.
The three tests buyers skip and regret
First, the test that reproduces the end use rather than the laboratory condition. For motorised blinds that usually means cycle endurance measured after the wash or exposure the product will actually see, because motor stall on wide blinds does not appear in a conditioned laboratory.
Second, the test on the assembled product. Flat goods can pass every check and still fail at a seam, a fold or a fixing point. Battery drain is usually a construction failure rather than a material one.
Third, retention. Keep one sealed sample per approved lot, labelled with the lot number and the date, for at least two years. It is the only way to know whether noise changed or the conditions did.
Turning test results into a purchase order clause
Write the acceptance value into the PO, name the method, and state what happens on failure: replacement, credit, or rejection at whose cost. A test without a consequence is advisory, and advisory tests get skipped when the schedule is tight.
Full parameter ranges are on the motorised blinds page; the checks that hold those ranges in production are described on the quality control page.
Questions buyers ask before ordering
How many cycles will the battery really do?
300-500 on a 50 mm wooden blind, less on wide heavy blinds. We quote the tested figure and will send the cycle log; treat any figure above 600 with suspicion.
Can it work with Home Assistant?
Yes if you choose Zigbee or Matter. RF 433 needs a bridge and is not a smart-home answer, whatever the listing says.
Is a hub required?
For WiFi, no. For Zigbee, yes, unless your buyer already has one. This is the most common pre-sales question and the most common source of returns.
How often to re-test
| Stage | What to test | Frequency |
|---|---|---|
| Development sample | All parameters in the specification | Once per development |
| First production lot | All parameters, plus the end-use test | Every lot for the first three |
| Repeat lots | Critical parameters and the one that failed before | Every lot |
| Annual | Full panel, including ageing where relevant | Once a year, or after any process change |
The rule behind the table is simple: test most when you know least. A supplier with three clean lots has earned a lighter regime; a supplier with a process change has not, even after five years.
Retained samples: the cheapest insurance in the order
Keep one sealed sample per approved lot, labelled with the lot number and the date, for at least two years. It costs a shelf. It is also the only way to answer the question that decides most claims: did the material change, or did the conditions?
Without a retained sample, a claim becomes an argument about memory. With one, it becomes a measurement, and measurements get resolved.
For motorised blinds, the sample should include the finish, not just the base material, because motor stall on wide blinds usually starts in the finish or the additive rather than the substrate.
The test plan for motorised blinds, by order size
| Order | Tests to run | What it establishes |
|---|---|---|
| Sample or trial | Operation noise | Whether the material can meet the requirement at all |
| First production order | Operation noise, Cycle endurance, Torque and current | The baseline every later lot is compared against |
| Repeat orders | Operation noise plus the parameter that failed last time | Whether the process has drifted |
| Annual or after a process change | Full panel | That nothing has moved in the background |
Testing more on a repeat order is waste; testing less on a first order is a gamble. The table is deliberately asymmetric, because the risk is. For motorised blinds, the one test never worth dropping is operation noise, because it is the one that predicts motor stall on wide blinds.
From quotation to specification in seven lines
Leave the tolerance and the method out and every dispute is settled by whoever needs the goods more.
- Noise: agree the test method with the number. Two labs, two methods, two answers, one argument.
- Torque (1.2-3.0 Nm): state where in the band this order sits. The middle of the band is not what a tolerance is for.
- Battery life: the figure you will accept inside the 300-500 cycles per charge band, the tolerance on it, and the method used to measure it.
- Limit setting (electronic with memory): name the number, not the word. If the answer only repeats the band, ask which point inside it is being offered for this order.
- Who inspects: third-party, in-house or none, decided in advance, with the AQL level written down.
- Reference sample: the signed sample is the definition of the colour, not the photograph in the catalogue.
- Price validity: the period during which the quoted figure holds, and what happens to it when the raw-material index moves.
Questions worth asking before the price is agreed
The questions below are the ones that cannot be answered from a catalogue, which is exactly why they are worth asking.
| Question | Answer that should worry you | Answer that holds up |
|---|---|---|
| Who signs the test report, and against which standard? | “Our QC department signs it.” | A named standard, a named method and a signature that belongs to somebody who can be asked again next year. |
| How do you hold torque inside 1.2-3.0 Nm? | “That is standard for us, no problem.” | The last three lots’ readings, the instrument used and who signs the report. Limit drift starts here. |
| What happens if limit setting misses the electronic with memory requirement? | “It will not happen.” | A re-test clause, the tolerance on the re-test, and the point at which the lot is remade rather than discounted. |
Need a test plan for a first order?
Send a window schedule or a single set size and we will return a quotation with the loading plan, the safety standard that applies to your market and the lead time for the colour you need. Catalogue and current price list on request.
Related reading
- Motorised Blinds vs Finished Blinds
- Power in Motorised blinds
- Motorised Blinds for Rental and hospitality
Catalogue and current price list · Neutral packing and private label · Consolidation, documents and lead times
