GE Druck DPI 880, Руководство пользователя

Страница: 18 / 21

16
- [EN] English
K405 Issue 3
Calibration - Procedures: CJ input
1. Connect the instrument to the calibration equipment
(Figure 9).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a one-point
calibration (+FS). The display shows the applicable
instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable T1 input task (Table 2).
5. Make sure that the DPI 880 gives a probe temperature
that agrees with the temperature on the digital
thermometer ±0.2°F (0.1°C).
Calibration - Procedures: RTD (Ohms) input
1. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
2. Use the calibration menu (Table 9) to do a two-point
calibration for each range.
• Range: 0-399.9
Ω
a. Nominal zero ohms: Make a 4 wire connection to
the 0
Ω
resistor (Figure 7).
b. Nominal positive full-scale ohms: Make a 4 wire
connection to the 400
Ω
resistor (Figure 7).
• Range: 400 Ω -4k Ω
a. Nominal zero ohms: Make a 4 wire connection to
the 400
Ω
resistor (Figure 7).
b. Nominal positive full-scale ohms: Make a 4 wire
connection to the 4k
Ω
resistor (Figure 7).
The display shows the applicable instructions to
calibrate each range.
3. To make sure that the calibration is correct, select the
applicable ohms input task (Table 2).
4. Make a 4 wire connection to the applicable standard
resistor (Table 18) and measure the value (Figure 7).
5. Make sure that the error is in the specified limits
(Table 18).
Table 18: RTD (Ohms) input error limits
Calibration - Procedures: RTD (Ohms) output
1. Connect the instrument to the calibration equipment
(Figure 8).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a two-point
calibration for each range.
• Range: 0-399.9 Ω
• Range: 400
Ω
-1999.9
Ω
• Range: 2k Ω -4k Ω
The display shows the applicable instructions to
calibrate each range.
4. To make sure that the calibration is correct, select the
applicable ohms output task (Table 2).
5. Supply the specified values (Table 19). Make sure that
the error is in the specified limits.
Table 19: RTD (Ohms) output error limits
Standard
Resistor*
(
Ω
)
* Or an equivalent resistance simulator
Resistor
error
(
Ω
)
Permitted
DPI 880 error
(
Ω
)
0 (Short circuit) - 0.05
100 0.008 0.05
200 0.013 0.05
300 0.018 0.05
400 0.007 0.05
1k 0.042 0.25
2k 0.052 0.25
4k 0.072 0.50
Ohms
( Ω )
Excitation
(mA)*
* Refer to “Specification”
Calibrator
error
( Ω )
Permitted
DPI 880 error
( Ω )
0 0.50 to 3.0 0.003 0.05
100 0.50 to 3.0 0.004 0.06
200 0.50 to 3.0 0.005 0.06
300 0.50 to 3.0 0.007 0.07
400 0.50 to 3.0 0.008 0.07
1000 0.05 to 0.8 0.015 0.30
2000 0.05 to 0.4 0.026 0.40
4000 0.05 to 0.3 0.049 0.80