Model 1823 - AEMC 1822 User Manual

5.2.1.2. Variations within the Range of Use
Quantity of Range of
influence influence
Temperature -4 to +122°F
(-20 to +50°C)
The aging of the internal reference voltage causes the intrinsic uncertainty to increase:

after 4000 hours of use with R and S thermocouples

after 8000 hours with other thermocouples
For Models 1821 and 1822, connecting the instrument to a computer via a micro USB cable causes an internal
temperature rise in the instrument that may result in a temperature measurement error of approximately 2.7°F
(1.5°C). This temperature rise does not occur when the instrument is connected to a wall outlet or when it is
powered by batteries.
5.2.1.3. Response Time
Response time is the time required for e.m.f. to reach 63% of its total variation when the thermocouple is
subjected to a temperature step. The sensor's response time depends on the heat capacity of the medium and
the thermal conductivity of the sensor. The response time of a thermocouple with good thermal conductivity,
immersed in a medium of high heat capacity, will be short. Conversely, in air or other thermally unfavorable
medium, the true response time can be 100 times or more longer than the thermocouple response time.

5.2.2. Model 1823

5.2.2.1. Temperature Measurements
Temperature sensor
Specified measurement range
Resolution
Intrinsic uncertainty
To determine the total intrinsic uncertainty, add the intrinsic uncertainty of the platinum probe to that of the
instrument, shown in the preceding table.
5.2.2.2. Variation within the Range of Use
Quantity of Range of influence
influence
Temperature +14 to +140°F (-10 to + 60°C)
5.3. Memory
The instrument has 8MB of flash memory, sufficient to record and store a million measurements. Each
measurement is recorded with the date, time, and unit. For the two-channel Model 1822, both measurements
are recorded.
5.4. USB
Protocol: USB Mass Storage
Maximum transmission speed: 12 Mbit/s Type B micro-USB connector
Thermometer Data Logger Models 1821, 1822, 1823
Quantity
influenced
θ
J: ± (0.02% R ± 0.27°F) / 18°F (± (0.02% R ± 0.15°C) / 10°C)
K: ± (0.03% R ± 0.27°F) / 18°F (± (0.03% R ± 0.15°C) / 10°C)
T: ± (0.03% R ± 0.27°F) / 18°F (± (0.03% R ± 0.15°C) / 10°C)
E: ± (0.02% R ± 0.27°F) / 18°F (± (0.02% R ± 0.15°C) / 10°C)
N: ± (0.035% R ± 0.27°F) / 18°F (± (0.035% R ± 0.15°C) / 10°C)
R: ± (0.01% R ± 0.45°F) / 18°F (± (0.01% R ± 0.25°C) / 10°C)
S: ± (0.01% R ± 0.45°F) / 18°F (± (0.01% R ± 0.25°C) / 10°C)
PT100 or PT1000
-148 to + 752°F (-100 to +400°C)
0.1°F (0.1°C)
± (0.4% R ± 0.5°F) (± (0.4% R ±
°C))
Quantity
influenced
Influence
θ
± 0.23°F / 18°F (± 0.13°C / 10°C)
Influence
17