Amprobe AMP-25 Manual

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
o
C  2
o
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
1. 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 “ 25 ”
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
3.
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.