Baker Hughes Druck DPI880 Manual De Instrucciones página 17

2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Set up the equipment with these conditions:
Equipment Function
Frequency meter: Gate time = one second
Signal generator: Output = 10V, unipolar, square wave
Frequency = 990 Hz
DPI880: Input units = Hz (Table 4)
Input trigger level = 5V (Table 4)
4. Use the calibration menu (Table 9) to do the
calibration. The display shows the applicable
instructions to complete the calibration.
5. To make sure that the calibration is correct, set up the
equipment to do one of these calibration checks:
a. Hz input calibration check (Figure 6):
Equipment Function
Frequency meter: Gate time = one second
Signal generator: Output = 10V, unipolar, square wave
DPI880: Input trigger level = 5V (Table 4)
Units (Table 4): Hz or kHz as specified in
Table 16 & Table 17.
b. Hz output calibration check (Figure 6):
Equipment Function
Frequency meter: Gate time = one second
DPI880: Input trigger level = 5V (Table 4)
Units (Table 5): Hz or kHz as specified in
Table 16 & Table 17.
6. Measure or supply the specified values (Table 16 &
Table 17): Hz then kHz. Make sure that the error is in
the specified limits.
Table 16: Hz Error Limits (Measure/Supply)
Measure/ Calibrator
Supply Hz Error (Hz)
25 0.000 175
100 0.000 7
250 0.001 75
500 0.003 5
990 0.006 93
Table 17: kHz Error Limits (Measure/Supply)
Measure/ Calibrator
Supply kHz Error (Hz)
2.500 0 0.017 5
10.000 0 0.07
20.000 0 0.14
30.000 0 0.21
50.000 0 0.35
4.7 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).
Permitted DPI880 Error (Hz)
0.002 0.001 4
0.002 0.002 1
0.004 0.003 5
0.006 0.005 8
0.011 0.010 4
Permitted DPI880 Error (kHz)
0.000 2 0.000 042
0.000 2 0.000 112
0.000 3 0.000 205
0.000 4 0.000 298
0.000 6 0.000 483
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 DPI880 gives a probe temperature
that agrees with the temperature on the digital
thermometer ±0.2°F (0.1°C).
4.8 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: 0-399.9Ω
a. Nominal zero ohms: Make a 4-wire connection
to the 0Ω resistor (Figure 7).
b. Nominal positive full-scale ohms: Make a 4-
wire connection to the 400Ω resistor (Figure 7).
• Range: 400Ω-4kΩ
a. Nominal zero ohms: Make a 4-wire connection
to the 400Ω resistor (Figure 7).
b. Nominal positive full-scale ohms: Make a 4-
wire connection to the 4kΩ 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
Standard Resistor
a
Resistor Error (Ω)
(Ω)
0 (Short circuit)
100
200
300
400
1k
2k
4k
a. Or an equivalent resistance simulator.
4.9 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: 0-399.9Ω
• Range: 400Ω-1999.9Ω
• Range: 2kΩ-4kΩ
4. To make sure that the calibration is correct, select the
applicable ohms output task (Table 2).
English–DPI880 Instruction Manual | 13
Permitted DPI880
Error (Ω)
- 0.05
0.008 0.05
0.013 0.05
0.018 0.05
0.007 0.05
0.042 0.25
0.052 0.25
0.072 0.50
Copyright 2005 Baker Hughes Company.