AccuMac AM1762 Руководство пользователя - Страница 6
Просмотреть онлайн или скачать pdf Руководство пользователя для Термометр AccuMac AM1762. AccuMac AM1762 10 страниц. Secondary standard platinum resistance thermometer
Печатать страницу
AM1760/1762 Secondary SPRT User's Guide
3 General Operations
3.1 Connecting to the readout device
The AM1760/1762 is equipped with a four-wire cable (see Figure 1).
Four lead wires are used to cancel lead wire resistance. For best
results, the readout device should be equipped to handle four-terminal
resistors. The lead wires can be distinguished by insulation colors.
Lead wire pairs attached to each end of the sensor are identified by
red/black and white/blue insulation.
White
Blue
3.2 Drive Current
AccuMac recommends 1mA as drive current to ensure the best
measurement.
3.3 Stability of Readings
To achieve the best accuracy, allow sufficient time for SPRT to
stabilize before taking the readings.
3.4 Immersion Requirements
Stem effect can cause measurement errors due to heat lost or gained
by the sensing element through the thermometer stem. To minimize
the error, appropriate immersion depths are required. A practical way
to determine the minimum immersion depths is to change the depth
Rev. 201609V3
Figure1
Red
Black
5/10