Amprobe AMP-25 Manuel

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 1 of 7

AMP-25, AMP-25-EUR Calibration Procedure

Document Change Record

Rev.001 initial release 02/05/2015

Rev.002 Updated Verification Table from Verification test point sheet 0 3/11/2015

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 2 of 7

Periodic calibration is required to conduct correct measurement. This instrument needs

periodic calibration at intervals of one year. Calibrate the instrument according to the following

procedures.

Cautions

 Read instruction manual and understand the use of the instrument and its accessory(ies)

correctly before proceeding the calibration activities.

 Calibrate the instrument at 23

C  2

C and humidity of 80% R.H. or less. Allow the

instrument to sit at this environment condition for > 30 minutes before calibration.

 Erroneous calibrating operation may lead to the incorrect performance and

measurement.

WARNINGS!

 Only trained personnel can do adjustments and repairing of the instrument!

 Be aware of all safety precautions to avoid electric shock when working on opened

instrument!

Recommended equipment:

 Fluke 5520 calibrator

 Transconductance Amplifier

 Current coil with overall diameter < 22 mm

Enter Calibration Mode

1.1. Press and hold the "HOLD" button while powering up. The display shows full screen

display symbols, then release buttons and press buttons immediately according to the

following sequence to enter the

calibration procedure mode.

LPF I inrush

→ I

ZERO

→

HOLD

→

LPF I lnrush

→

The "HOLD" symbol on display will flash when in calibration mode.

1.2. Press

LPF I inrush button, the display shows “A1”, press LPF I inrush button again

to select “

”

2. Calibrate the position error (when in calibration mode)

2.1. Press button to select AC A mode

2.2. Clamp the jaw around the current coil. Ensure the jaw is completely close.

2.3. Apply the reference current AC 100 A / 50 Hz, and position the jaw as below, then

record the reading on the display.

Current coil

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 3 of 7

2.4. Move the jaw as below, then record the reading.

2.5. If the reading from step 2.3. and 2.4. have the difference > 0.1, adjust VR52 and

repeat step 2.3. and 2.4. until both readings keep the difference ≤ 0.1

2.6. Remove the EUT from the current coil

Calibrate Offset

(ensure no signal is supplied on EUT’s jaw)

3.1. Press button to select DC A mode

3.2. Adjust VR54 and VR53 until display shows 0.00

3.3. After the offset adjustment in step 3.2., the display value from environment should be

within +/- 0.05

Current coil

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 4 of 7

Component position layout

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 5 of 7

4. AC A calibration (in calibration mode)

4.1. Press button to select AC A mode

4.2. Clamp the jaw around the current coil and centered according the alignment mark on

the jaw. Ensure the jaw is completely close.

4.3. Apply the standard reference current according to Table 1., the display should show a

value (this shown reading does not have to be accurate from the standard reference).

4.4. Until the reading stabilized, press “HOLD” button to save the standard reference

calibration point. A beep will sound when successfully saved the CAL point.

4.5. Repeat step 4.3. and 4.4. for the next calibration point.

4.6. If EUT beeps twice when pressing HOLD button, it indicates the CAL point fail to save.

Repeat step 4.3. and 4.4. If EUT still fails to save CAL data point, contact Amprobe for

serving.

5. LPF calibration (in calibration mode)

5.1. Press

LPF

button to select LPF mode

5.2. Clamp the jaw around the current coil and centered according the alignment mark on

the jaw. Ensure the jaw is completely close.

5.3. Apply the standard reference current according to Table 1., the display should show a

value (this shown reading does not have to be accurate from the standard reference).

5.4. Until the reading stabilized, press “HOLD” button to save the standard reference

calibration point. A beep will sound when successfully saved the CAL point.

5.5. Repeat step 5.3. and 5.4. for the next calibration point.

5.6. If EUT beeps twice when pressing HOLD button, it indicates the CAL point fail to save.

Repeat step 5.3. and 5.4. If EUT still fails to save CAL data point, contact Amprobe for

serving.

6. DC A calibration (in calibration mode)

6.1. Press button to select DC A mode

6.2. Clamp the jaw around the current coil and centered according the alignment mark on

the jaw. Ensure the jaw is completely close.

6.3. Apply the standard reference current according to Table 1., the display should show a

value . Then, remove EUT from the current coil. Press ZERO button > 2sec to zero EUT.

6.4. Position EUT back to the current coil as step 6.2. and apply the standard reference

current according to Table 1., the display should show a value .

6.5. Until the reading stabilized, press “HOLD” button to save the standard reference

calibration point. A beep will sound when successfully saved the CAL point.

6.6. Repeat step 6.2. to 6.5. for the next calibration point.

6.7. If EUT beeps twice when pressing HOLD button, it indicates the CAL point fail to save.

Repeat step 4.3. and 4.4. If EUT still fails to save CAL data point, contact Amprobe for

serving.

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 6 of 7

7. Exit Calibration mode

7.1. Turn OFF the EUT to exit calibration mode.

8. Verification Test

8.1. Verify the accuracy of the data points in Table 1 according to the accuracy specifications

in users manual.

8.2. If reading is out of specifications, perform the following to clear all CAL data:

Press and hold the "HOLD" button while powering up. The display shows full screen

display symbols, then release buttons and press buttons immediately according to the

following sequence

LPF I inrush

→ I

ZERO

→

HOLD

→

LPF I lnrush

→

Press and hold

until display shows "

CLr

The EUT will enter calibration mode after showing "CLr".

8.3. Start from Step 1 for re-calibration

8.4. If EUT still fails to comply with accuracy specifications after calibration, contact

Amprobe for servicing

Table 1: Calibration data point

Recommended equipment:

· Fluke 5520 calibrator

· Transconductance Amplifier

· Current coil with overall diameter < 22 mm

* Refer to the latest published

specifications and update the

calculation as applicable

Input

reference

Function Range

Accuracy*

LSD*

Res.*

A Hz Low Limits

High limits

AC A 60.00

1.5%

0.01

10.00

9.80

10.20

60.00

1.5%

0.01

10.00

9.80

10.20

60.00

2.5%

0.01

10.00

200

9.70

10.30

60.00

2.5%

0.01

10.00

400

9.70

10.30

60.00

1.5%

0.01

30.00

29.50

30.50

60.00

2.5%

0.01

30.00

200

29.20

30.80

60.00

2.5%

0.01

30.00

400

29.20

30.80

60.00

1.5%

0.01

60.00

59.05

60.95

60.00

2.5%

0.01

60.00

200

58.45

61.55

60.00

2.5%

0.01

60.00

400

58.45

61.55

Procedure for Item Number:

AMP-25, AMP-25-EUR Calibration Procedure

4588254, 4588268

Rev. 002 Page 7 of 7

300.0

1.5%

0.1

100.0

98.0

102.0

300.0

2.5%

0.1

100.0

200

97.0

103.0

300.0

2.5%

0.1

100.0

400

97.0

103.0

300.0

1.5%

0.1

290.0

285.2

294.8

300.0

2.5%

0.1

290.0

200

282.3

297.7

300.0

2.5%

0.1

290.0

400

282.3

297.7

LPF 60.00

3.5%

0.01

50.00

48.20

51.80

300.0

3.5%

0.1

100.0

96.0

104.0

300.0

3.5%

0.1

250.0

240.8

259.2

Zero the instrument before making each DC A measurement

DC A 60.00

1.5%

0.01

10.00

9.75

10.25

(manual DC A mode) 60.00

1.5%

0.01

-10.00

-10.25

-9.75

60.00

1.5%

0.01

30.00

29.45

30.55

60.00

1.5%

0.01

-30.00

-30.55

-29.45

60.00

1.5%

0.01

60.00

59.00

61.00

60.00

1.5%

0.01

-60.00

-61.00

-59.00

300.0

1.5%

0.1

100.0

98.0

102.0

300.0

1.5%

0.1

-100.0

-102.0

-98.0

300.0

1.5%

0.1

290.0

285.2

294.8

300.0

1.5%

0.1

-290.0

-294.8

-285.2

 End of Calibration 

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