Druck DPI 841 Manual del usuario - Página 13

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5. To make sure that the calibration is correct, set up the

equipment to do one of these calibration checks:

• Hz input calibration check (Figure 1):

Frequency meter:

Signal generator:

DPI 841/842:

• Hz output calibration check (Figure 2):

Frequency meter:

DPI 841/842:

6. Measure or supply the specified values (Table 10/11):

Hz then kHz. Make sure that the error is in the specified

limits.

Table 10: Hz error limits (Measure/Supply)

Measure/

Calibrator

Supply

error (Hz)

0.000175

100

0.0007

250

0.00175

500

0.0035

990

0.00693

Table 11: kHz error limits (Measure/Supply)

Measure/

Calibrator

Supply

error (kHz)

kHz

2.5000 0.0175

10.0000 0.07

20.0000 0.14

30.0000 0.21

50.0000 0.35

Calibration - Procedures (mA input)

1. DPI 842 only. Connect the instrument to the calibration

equipment (Figure 5).

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 three-point

calibration (-FS, Zero and +FS). The display shows the

applicable instructions to complete the calibration.

4. To make sure that the calibration is correct, select the

applicable mA input task (Table 2) and apply these

values:

• mA: -55, -40, -24, -18, -12, -6, 0 (open circuit)

Then mA: 0, 6, 12, 18, 24, 40, 55.

K395 Issue 3

Gate time = one second

Output = 10V, unipolar,

square wave

Input trigger level = 5V (Table 4)

Units (Table 4): Hz or kHz as

specified in Table 10/11.

Gate time = one second

Units (Table 5): Hz or kHz as

specified in Table 10/11.

Permitted

DPI 841/842 error (Hz)

0.002

0.0014

0.002

0.0021

0.004

0.0035

0.006

0.0058

0.011

0.0104

Permitted

DPI 841/842 error (kHz)

0.0002

0.000042

0.0002

0.000112

0.0003

0.000205

0.0004

0.000298

0.0006

0.000483

5. Make sure that the error is in the specified limits

(Table 12).

Table 12: mA input error limits

Applied

Calibrator

error

(mA)

±55

0.0022

±40

0.0018

±24

0.0014

±18

0.0004

±12

0.0003

±6

0.0002

0 (open circuit)

Calibration - Procedures (Amplitude output)

1. Connect the instrument to the calibration equipment

(Figure 2).

2. Let the equipment get to a stable temperature

(minimum: 5 minutes since the last power on).

3. Set up the DPI 841/842 with these conditions:

Output Hz = 0 (For direct current output)

Output amplitude: Set to Unipolar (Table 5)

Output waveform = Square Wave (Table 5)

4. Use the calibration menu (Table 9) to do the Square

Wave calibration. The display shows the applicable

instructions to complete the calibration.

Calibration values: Low = 0.1V, High = 20V

5. Change the output waveform to Sine Wave (Table 5).

6. Use the calibration menu (Table 9) to do the

Sine/Triangular Wave calibration. The display shows

the applicable instructions to complete the calibration.

Calibration values: Low = 0.1V, High = 20V

Permitted

DPI 841/842 error

(mA)

0.005

0.004

0.003

0.002

0.001

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