When you switch on an AF-i1 installed in a vehicle on a cold day, the warm-up, the preparation stage before testing, may appear longer than usual. What safety managers or technical staff reviewing this situation need is not a short conclusion such as "it was late because of the cold," but a record that lets them recheck what environment the device was in and when and how the screen changed.
The official AF-i1 product information gives a warm-up time of about 1 second at 25 ℃, about 120 seconds at -20 ℃, and about 180 seconds at -40 ℃. However, this time can vary depending on the previous reading. So rather than equating the waiting time observed on site directly with a particular temperature condition in the official information, record separately how the temperature was checked, when the power was turned on, how the screen changed, and any actions taken in between.
Attach the location and source to each temperature value
If you write down only a number for temperature, the range of interpretation widens. The fact that the vehicle's exterior display showed -10 ℃ does not mean the temperature around the handset inside the vehicle was -10 ℃. In the record, write the temperature value together with the time checked, where the temperature was checked, and the means of checking. For example, if you looked at the vehicle's exterior display, record something like "07:08, vehicle exterior temperature display read -10 ℃."
If you checked the inside of the vehicle with a separate thermometer, add where the thermometer reading was taken. If you could not check the interior temperature, it is more accurate to write "vehicle interior temperature could not be checked." The time parked outdoors and the weather at the time are only supporting information describing the environment the device was in; they are not grounds for recording them as the device's own temperature.
Record warm-up time as start and end times
An expression like "warm-up took a long time" cannot be compared with cases on other days. Writing down in order the time the power was turned on, the first screen wording seen, and the time the ready screen appeared lets you reconstruct the actual elapsed time and the screen flow. If the ready screen did not appear, record the last time you checked and the wording displayed then.
Because the AF-i1's warm-up time can vary depending on the previous reading, the state before power-on is also something to record. Distinguish whether a test was taken just before, whether the device was already on, and whether these facts are unknown. Only by leaving facts you could not confirm blank or recording them as "could not be confirmed" do you keep guesses from turning into observed facts later.
| What to record | What to write specifically | Why the record is needed |
|---|---|---|
| Temperature conditions | Temperature value, time checked, where checked, means of checking | To distinguish the outside air temperature from the environment around the device |
| Warm-up progress | Time of power-on, screen wording, time ready appeared or last checked | To confirm the waiting time and the order of screen changes |
| State before starting | Whether a test was taken just before, existing power state, whether these can be confirmed | To look at differences due to the previous reading as well |
| Actions in between | Whether power was restarted, time of the action, screen changes afterward | To separate the original warm-up from the situation after intervention |
Separate screen wording from what people did
Copy warm-up prompts or error messages exactly as shown on the screen whenever possible. If you summarize it as "an error occurred," it is hard to know whether the warm-up screen simply continued or a different message appeared. If you took a photo of the screen, also link the time the photo was taken and the stage after power-on at which it was taken.
It is also better not to mix observations and actions in one sentence. Rather than "it wasn't ready so I turned it off," writing in time order, such as "07:10 power on, 07:12 warm-up prompt confirmed, 07:13 power restarted," lets you distinguish the original warm-up process from the state after the restart. This distinction is especially important later when checking whether the issue recurs or when explaining the situation to technical support.
Define the scope of the record with a hypothetical case
As a hypothetical case, suppose the AF-i1 in a vehicle parked outdoors was switched on at 07:10 in the morning and the warm-up prompt showed longer than usual. If the vehicle's exterior temperature display showed below freezing but the interior temperature was not checked, the observation record could read: "07:10 power on, below freezing confirmed on exterior temperature display, vehicle interior temperature could not be checked, 07:12 warm-up prompt confirmed." If the ready screen then appeared at 07:12, add that time and the screen change.
What this record supports is only the fact that a warm-up process of a certain length was observed in an outdoor environment confirmed to be below freezing. The exterior temperature display and the -20 ℃ and -40 ℃ conditions in the official information may differ in what was measured and how, so you cannot conclude that the on-site waiting time is a result under the same conditions as the official figures. A possible action is to proceed with the procedure once the device shows it is ready, and if a similar delay or a particular screen message recurs, to pass the records along for further checking.
The criterion for a complete record in this case is not determining the cause. The source of the temperature, the times of power-on and screen changes, whether the device became ready, and any actions taken in between must all be recorded. Only then can you compare whether later cases occurred under the same starting conditions.
When comparing, match the starting conditions beyond temperature
When comparing warm-up times on different days, putting only the temperatures side by side makes it hard to narrow down the cause. Look also at whether the vehicle was outdoors or indoors, what state the device was in before power-on, and whether a test had been taken just before and the screen wording was the same. Concluding from a single long warm-up that the sensor condition has changed or the device is faulty can miss differences in the previous reading and starting conditions.
Keep the warm-up times in the official product information as reference values under the temperature conditions the product states, and keep site records separate as facts observed in a specific vehicle at a specific time. Rather than trying to skip the process before the device is ready or heating it with an external heat source, recording the conditions and screen flow produces material that can explain cold-weather warm-up delays.
