Instructions
AM 503B, AM 5030 & A6300 Series
067-0271-00 Verification and Adjustment Kit
070-9352-01
This document applies to firmware version 3.0
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
Copyright T ektronix, Inc. All rights reserved.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
Table of Contents
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kit Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kit Parts List 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM 503B and AM 5030 Performance Verification 3. . . . . . . . . . . . . . .
T est Procedure Conditions 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Balance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMS Noise 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Degauss 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Installation 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assemble GPIB Test Fixture 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove Side Covers 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install GPIB T est Fixture 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM 503B and AM 5030 Adjustments 19. . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier Setup 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calculate and Load New Calibration Constants 20. . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Removal (AM 503B Only) 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification Setup for Current Probes 23. . . . . . . . . . . . . .
T est Procedure Conditions 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Preparation 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W arranted Specifications 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6312 Performance Verification 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Test Equipment 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6302 and A6302XL Performance Verification 35. . . . . . . . . . . . . . . . . .
Required Test Equipment 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL Performance Verification 45. . . . . . . . . . . . . . . . . .
Required Test Equipment 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6304XL Performance Verification 55. . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Test Equipment 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
i
Table of Contents
Adjustment Procedures for Current Probes 63. . . . . . . . . . . . . . . . . . . . .
A6312, A6302 and A6302XL Adjustment 65. . . . . . . . . . . . . . . . . . . . . . .
Required Test Equipment 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6312, A6302 and A6302XL DC Offset Adjustment 65. . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL Adjustments 69. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Test Equipment 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL DC Offset Adjustment 70. . . . . . . . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL Transient Response and Gain Adjustment 72. . . . . . . . . . . .
A6304XL Adjustments 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Test Equipment 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6304XL DC Offset Adjustment 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Adjustment 78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6304XL Transient Response Adjustment 80. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
Ground the Product
Do Not Operate Without
Covers
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
Avoid Exposed Circuitry
This product is grounded through the grounding conductor of the power cord. To
avoid electric shock, the grounding conductor must be connected to earth
ground. Before making connections to the input or output terminals of the
product, ensure that the product is properly grounded.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
To avoid injury, remove jewelry such as rings, watches, and other metallic
objects. Do not touch exposed connections and components when power is
present.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
iii
General Safety Summary
Product Damage Precautions
Use Proper Power Source
Use Proper Voltage
Setting
Provide Proper Ventilation
Do Not Operate With
Suspected Failures
Do not operate this product from a power source that applies more than the
voltage specified.
Before applying power, ensure that the line selector is in the proper position for
the power source being used.
To prevent product overheating, provide proper ventilation.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
Terms on the Product
iv
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
General Safety Summary
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Certifications and Compliances
CSA Certified Power
Cords
Safety Certification of
Plug-in Modules
CSA Certification includes the products and power cords appropriate for use in
the North America power network. All other power cords supplied are approved
for the country of use.
For plug-in modules that are safety certified by Underwriters Laboratories, UL
Listing applies only when the module is installed in a UL Listed product. CSA
Certification applies only when the module is installed in a CSA Certified
product.
Protective Ground
(Earth) T erminal
ATTENTION
Refer to Manual
Double
Insulated
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
v
General Safety Summary
vi
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone
Disconnect Power
Use Care When Servicing
With Power On
Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
To avoid electric shock, disconnect the main power by means of the power cord
or, if provided, the power switch.
Dangerous voltages or currents may exist in this product. Disconnect power,
remove battery (if applicable), and disconnect test leads before removing
protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
vii
Service Safety Summary
viii
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
Kit Description
Kit Parts List
This kit includes parts and instructions for verifying and adjusting the AM 503B
and AM 5030 Current Probe Amplifiers. The recommended calibration interval
is one year.
These instructions assume a certain familiarity with the AM 503B and AM 5030
amplifiers. For servicing information, refer to the AM 503B & AM 5030
Instruction Manual (070-8766-XX).
Before you begin the AM 503B or AM 5030 amplifiers, assemble the test
equipment required and determine if a full calibration is necessary. None of the
components contained in this kit require calibration.
This kit includes the parts listed in Table 1.
T able 1: Kit Parts List
Tektronix Part Number Quantity Description
015-0598-00 1 Voltage adapter
Equipment Required
015-0670-00 1 Feed-thru adapter
129-0425-00 2 Spacer, post: 0.9 L, 4-40 thru, 0.25 hex
174-2314-00 1 Ribbon cable
21 1-0408-00 6 Screw, assem wshr: 4-40 X 0.250, T-10 Torx
220-0729-00 1 Nut block: 4-40 X 0.188
679-2836-02 1 GPIB board
070-9352-XX 1 Calibration Kit Manual
The installation procedure requires a T-10 Torx screwdriver and a flat-blade
screwdriver.
The performance verification and adjustment procedures require the test
equipment listed in Table 2. The test equipment must meet or exceed the
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
1
Kit Description
specifications listed. You may need to modify the test procedures if you do not
use the recommended equipment.
T able 2: Required Test Equipment
Recommended
Qty Item Description
1 Oscilloscope 500 MHz bandwidth TDS 520B
Equipment
1 Leveled Sine Wave
Generator
1 Digital Multimeter 0.20%, 31/2 digit resolution, range
1 Current Source 0.1%, 0 to ±1 A Fluke 5700A or
1 Calibration Fixture 50 , BNC Connector 015-0601-50
1 Termination 50 ±0.1%, 0.5 W 01 1-0129-00
2 BNC Cables 50 , 1.05m (42in) long 012-0057-01
2 BNC to Dual
Banana Adapters
1 Feed-thru Fixture supplied with kit 015-0670-00
1 Voltage Adapter supplied with kit 015-0598-00
1 Current Probe
1
Required for functional test only.
1
3 MHz to 100 MHz Wavetek 9100 with
Option 250 or SG 503
equivalent.
DM2510/G or
±50 mV
Fluke 850x/884x
Wavetek 9100 with
Option 250
103-0090-00
A6302
2
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Performance Verification
Refer to the list of equipment required in Table 2 on page 2. Set up the AM 503B
or AM 5030 amplifiers as follows:
1. Plug the AM 503B or AM 5030 amplifier into the TM 5000 mainframe.
2. Power the amplifier on and let it warm up at least 20 minutes.
The procedures in this section verify that the AM 503B or AM 5030 amplifier
meets the warranted specifications listed in Table 3.
T able 3: AM 503B and AM 5030 Warranted Specifications
Parameter Characteristic
DC Gain Accuracy ≤ 1.5% after DC accuracy measurement and cal constant
loading.
DC Balance ± 2 mV
RMS Noise ≤ 250 A (2.5 mV)
Bandwidth ≥ 100 MHz
Test Procedure Conditions
These procedures are valid only under the following conditions:
H The system has been calibrated at an ambient temperature of 23_ ±5_ C.
H The system is operating in an environment whose limits are described in
T able 4: AM 503B and AM 5030 Environmental Characteristics
Parameter Characteristic
Ambient Temperature
Humidity
H The system, including probe, has had a warm-up period of at least
Table 4.
Operating 0_ C to +50_ C
Operating 50_ C, to 95% R.H.
20 minutes.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
3
AM 503B and AM 5030 Performance Verification
DC Gain Accuracy
Use the following procedure to verify the DC gain accuracy of the amplifier.
Test Equipment Setup
Refer to Figure 1 and set up the test equipment as follows:
1. Connect the output of the amplifier to the DMM.
a. Connect a BNC Cable from the AM 503B/AM 5030 OUTPUT to the
50 feedthrough termination.
b. Attach the termination to a BNC-to-dual banana adapter.
c. Observe polarity and insert the dual banana adapter into the digital
multimeter DC voltage input.
2. Connect the input to current source.
a. Connect the other BNC cable from the Voltage Adapter to a BNC-to-
dual banana adapter.
b. Observe polarity and insert the dual banana adapter into the current
source DC output. Do not connect the voltage adapter to the amplifier at
this time.
Amplifier in TM
Series Power
Module
DMM
Current
Source
+–
BNC to Dual
Banana Adapter
50 T ermination
50 Coaxial
Cable
+–
Feed-Thru Fixture
Voltage Adapter
BNC to Dual
Banana Adapter
Figure 1: Test Equipment Setup
4
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Performance Verification
3. Make or verify the equipment settings in Table 5:
T able 5: Equipment Settings
Digital Multimeter
Measurement Type DC volts
Range Autoranging
Current Source
Output Off
AM 503B and AM 5030 Amplifier
Coupling DC
BW Limit On (20MHz)
Current/division 10 mA/division
Probe Trim 000
Procedure
After the equipment is set up, proceed as follows:
1. Connect the feed-thru fixture (015-0670-00) to the INPUT of the AM 503B/
AM 5030 amplifier and press the PROBE DEGAUSS AUTOBALANCE
button. Wait for the degauss/autobalance routine to complete before
proceeding. The routine is complete when the indicator light turns off.
2. Remove the feed-thru fixture from the INPUT of the amplifier and connect
the Voltage Adapter (015-0598-00) to the INPUT of the amplifier. Do not
press the PROBE DEGAUSS AUTOBALANCE button again even though
the indicator is flashing.
3. For each of the current/division settings in Table 6, perform the following
steps. Remember that any errors that develop here will affect the final DC
gain accuracy calculations at the end.
a. Set the Amplifier to the desired current/division setting from Table 6.
b. Set the current source to the correct positive test current using Table 6.
c. Turn on the current source.
d. Record the exact measurement of the digital multimeter as M
. (You can
1
copy Table 7 on page 8 to record the results of your measurements.)
e. Set the current source for the correct negative test current using Table 6.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
5
AM 503B and AM 5030 Performance Verification
T able 6: DC Gain Accuracy Calibration Test for the AM503X
AM 503B and AM 5030
Current/Division
1 m A ±100 A 10 mA
2 m A ±200 A 20 mA
5 m A ±500 A 50 mA
10 m A ±1mA 100 mA
20 m A ±2mA 200 mA
50 m A ±5mA 500 mA
100 m A ±10mA 1 A
200 m A ±20mA 2 A
500 m A ±50mA 5 A
1 A ±100 mA 10 A
2 A ±100 mA 10 A
Current Source Output Test Current (It)
5 A ±100 mA 10 A
f. Record the digital multimeter reading as M2.
g. Calculate the measured current (I
I
m
M1–M
2
(currentdivision)
0.01
) using the following formula:
m
For example, you might have obtained values of 51.0 mV for M1 and
–53.0 mV for M
sion, you can compute I
(51.0x10
I
m
. If you are using an Amplifier setting of 10 mA/divi-
2
as:
m
–3
) – (–53.0x10–3)
0.01
(10x10–3) 104 mA
6
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Performance Verification
h. Calculate the %Error between the measured current (I
current (I
%Error +
) %Error as follows:
t
I
* I
m
t
100
I
t
) and the test
m
For example, using a test current It of 100 mA and a measured current I
of 104 mA, the %Error would be:
%Error +
104 – 100
100
100 +)4%
NOTE. It is important that the correct polarity be used in order to calculate the
% error
4. Copy the work sheet in Table 7 and fill it in with required data. Calculate the
values for each New Rin Cal Constant only if adjustment is required.
m
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
7
AM 503B and AM 5030 Performance Verification
T able 7: Work Sheet for DC Gain Accuracy Calibration
AM 503B and
AM 5030
Current/
Division
Current/Voltage
Source Output
Test
Current
I
t
I
m
M
1
M
2
(Note A)
%Error
(Note B)
Rin
Name
1mA ±100 A 10 mA
2mA ±200 A 20 mA
5mA ±500 A 50 mA
10 mA ±1mA 100 mA Rin1X
20 mA ±2mA 200 mA
50 mA ±5mA 500 mA
100 mA ±10 mA 1 A Rin10X
200 mA ±20 mA 2 A
500 mA ±50 mA 5 A
1 A ±100 mA 10 A Rin100X
2 A ±100 mA 10 A
5 A ±100 mA 10 A
Note A
Note B
M2* M
+
I
m
0.01
%Error +
1
(currentńdivision)
* I
I
m
t
100
I
t
Note C Query amplifier for existing Rin1X, Rin10X, and Rin100X Cal Constants
(CALC? 00, CALC? 01, and CALC? 02 respectively).
Note D
New Rin Cal Constant + (1 )
%Error
100
) Existing Rin Cal c onstant
(Calculate this value only if adjustment is required.)
Existing
Cal
Constant
(Note C)
New
Cal
Constant
(Note D)
8
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
DC Balance
AM 503B and AM 5030 Performance Verification
5. Verify that the measured DC gain accuracy is within ±1.5% at all settings.
NOTE. If the % Error on any of the settings is greater than ±1.5%, you must
perform the Cal Constant loading sequence. Refer to the adjustment procedure
that begins on page 19.
This procedure checks the DC Balance Test of the AM 503B and AM 5030.
1. Connect a BNC cable from the AM 503B/AM 5030 amplifier OUTPUT to
the 50 feedthrough termination. Attach the termination to a BNC-to-dual
banana adapter.
2. Taking care to observe and maintain polarity, insert the dual banana adapter
into the digital multimeter DC voltage input. Refer to Figure 2.
Amplifier in TM
Series Power
Module
DMM
+–
BNC to Dual
Banana Adapter
50 Termination
50 Coaxial
Cable
Voltage Adapter
Figure 2: Setup for DC Balance
3. Connect the Voltage Adapter (015-0598-00) to the INPUT of the amplifier
and disconnect the other end of the Voltage Adapter from ALL other sources.
In other words, the BNC end of the Voltage adapter should not be connected
up to any thing.
4. Make or verify the equipment settings in Table 8.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
9
AM 503B and AM 5030 Performance Verification
T able 8: Equipment Settings for DC Balance
Digital Multimeter
Measurement Type DC volts
Range Autoranging
AM 503B and AM 5030 Amplifier
Coupling REF
BW Limit On (20MHz)
Current/division 1 mA/division
5. Press the PROBE DEGAUSS AUTOBALANCE button. Wait for the
degauss/autobalance routine to complete before proceeding. The routine is
complete when the indicator light turns off.
6. For each of the Amplifier settings (AC, DC, 1 mA, 2 mA, 5 mA, 10 mA,
20 mA, 50 mA, 100 mA, 200 mA, 500 mA, 1 A, 2 A, 5 A), perform the
following steps.
RMS Noise
a. Set the amplifier to the desired setting from above.
b. Measure the exact DC voltage with the digital multimeter.
c. Verify that the measured DC voltage is less than ±2mV (0.2 divs).
This procedure tests the RMS noise level of the AM 503B and AM 5030 Current
Probe Amplifier. In this test you measure the RMS voltage of the amplifier
output when the amplifier is set to the most sensitive setting and BW LIMIT is
off. Refer to Figure 4 when making equipment connections.
Amplifier in TM
Test Oscilloscope
Series Power
Module
Voltage Adapter
10
50 oscilloscope input (or add 50
termination here if oscilloscope has
only high-impedance input).
Figure 3: RMS Noise Test Setup for stand alone AM 503B/AM 5030
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Performance Verification
1. Using a 50 W BNC cable, connect the Amplifier OUTPUT to a 50 W
oscilloscope input. If the input impedance of your oscilloscope is 1 MW,
connect a 50 W feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the Voltage Adapter to the Amplifier INPUT.. The other end of the
Voltage Adapter should not be connected to anything.
3. Make or verify the equipment settings in Table 9.
T able 9: Equipment Settings for RMS Noise Check
Oscilloscope
Vertical input impedance 50
Vertical gain 10 mV/division
Time base 2 us/division
Record length 500
Coupling DC
Offset 0 V (mid-scale)
Trigger type Edge
Trigger mode Auto
Trigger position 50%
Acquisition mode Sample
Bandwidth 100 MHz
Measurement type RMS
AM 503B and AM 5030
Coupling DC
BW Limit Off (full bandwidth)
Current/division 1 mA/division
4. Press the Amplifier PROBE DEGAUSS AUTOBALANCE button. Wait
for the degauss/autobalance routine to complete before proceeding. The
routine is complete when the indicator light turns off.
5. Set the Oscilloscope couping to AC.
6. Using the RMS measurement capability of the oscilloscope, measure the
RMS reading, and verify that it is less than 250 mA (2.5 mV).
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
11
AM 503B and AM 5030 Performance Verification
Bandwidth
This procedure tests the bandwidth of the AM 503B and AM 5030. In this test
you measure a signal at a relatively low frequency and again at the upper test
frequency. The two measurements are compared to verify that the signal
amplitude does not fall below a certain limit. Refer to Figure 4 when making
equipment connections.
Leveled
Sine Wave
Generator
Output
Test Oscilloscope
50 oscilloscope input (or add 50
termination here if oscilloscope has
only high-impedance input).
Amplifier in TM
Series Power
Module
Voltage Adapter
Figure 4: Bandwidth Test Setup
1. Using a 50 W BNC cable, connect the Amplifier OUTPUT to a 50 W
oscilloscope input. If the input impedance of your oscilloscope is 1 MW,
connect a 50 W feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the Voltage Adapter to the Amplifier INPUT.
3. Make or verify the equipment settings in Table 10:
12
T able 10: Equipment Settings for Bandwidth Check
Oscilloscope
Vertical input impedance 50
Vertical gain 10 mV/division
Time base 100 ns/division
Record length 500
Coupling DC
Offset 0 V (mid-scale)
Trigger type Edge
Trigger mode Auto
Trigger position 50%
Acquisition mode Average
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Performance Verification
T able 10: Equipment Settings for Bandwidth Check (Cont.)
Oscilloscope
Number of waveforms to average 16
Measurement type Peak-to-Peak
Leveled Sine Wave Generator
Frequency 3MHz
Amplitude 3.0 V
AM 503B and AM 5030
Coupling DC
BW Limit Off (full bandwidth)
Current/division 500 mA/division
p-p
4. Press the Amplifier PROBE DEGAUSS AUTOBALANCE button. Wait
for the degauss/autobalance routine to complete before proceeding. The
routine is complete when the indicator light turns off.
5. Connect the BNC cable from the output of the leveled sine wave generator to
the BNC end of the Voltage Adapter.
6. Adjust the signal generator output so that the Amplifier output is approximately 60 mV
, or six graticule divisions on the oscilloscope.
p-p
7. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M
.
1
8. Set the oscilloscope time base to 5 ns/division. Increase the signal generator
frequency to 100 MHz, the upper test frequency.
9. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M
.
2
10. The system meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 70% of the signal amplitude
at 3 MHz. Using the following calculation, verify system bandwidth:
M
2
ǒ
Ǔ
u 0.707
M
1
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
13
AM 503B and AM 5030 Performance Verification
Degauss
This is only a functional test of the degauss operation. Refer to Figure 5.
1. Connect a current probe to the output of the AM 503B or AM 5030.
2. Press the Amplifier PROBE DEGAUSS AUTOBALANCE button. Wait
for the indicator light to turn off.
3. Verify that there are no error codes.
Test Oscilloscope
Amplifier in TM
Series Power
Module
Current Probe
50 Input
Figure 5: Setup for Degaussing the Current Probe
This completes the performance verification.
If the AM 503B or AM 5030 amplifier fails any of the verification tests, refer to
the AM 503B and AM 5030 Instruction Manual for servicing information.
14
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
GPIB Installation
WARNING. Instrument disassembly should only be performed by qualified service
personnel.
This section details how to assemble the GPIB test fixture and install it in the
AM 503B Current Probe Amplifier prior to performing the adjustment procedure. The AM 503B amplifier requires the GPIB test fixture in order to set the
internal calibration constants. After the adjustment procedure is complete, you
must remove the test fixture.
The AM 5030 amplifier already contains a GPIB board. If you are calibrating an
AM 5030 amplifier, disregard this section and proceed with the adjustment
procedure on page 19.
CAUTION. GPIB installation should only be performed by qualified service
personnel.
Assemble GPIB Test Fixture
Use the following procedure to assemble the GPIB test fixture. Once you
assemble the fixture, you can use it to calibrate any number of AM 503B
amplifiers.
1. Refer to Figure 6. Install the spacers (129-0425-00) onto the GPIB board
with two screws (210-0408-00).
2. Install the ribbon cable (174-2314-00) onto the GPIB with the RED edge
oriented as shown. (The tabbed end of the connector connects to the main
board of the AM 503B amplifier.)
3. Install nut block (220-0729-00) onto the GPIB board with one screw
(210-0408-00).
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
15
GPIB Installation
Screw
GPIB Board
Nut Block
Spacers (2)
Screws (2)
Figure 6: Assembling the GPIB Test Fixture
Ribbon Cable
Red Edge
Remove Side Covers
Refer to Figure 7 and unlatch the securing screws with a flat-blade screwdriver.
Remove both covers from the AM 503B and set them to one side.
Amplifier
Securing Screw
Figure 7: Removing the AM 503B Side Covers
16
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
Install GPIB Test Fixture
GPIB Installation
Refer to Figure 8 and install the GPIB test fixture on the AM 503B main board.
1. Install the tabbed end of the ribbon cable (174-2314-00) onto the main board
keeping the RED edge towards rail.
GPIB Board
Screw
Screws (2)
Figure 8: Installing the GPIB Test Fixture
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
17
GPIB Installation
CAUTION. To avoid damaging the circuits, make sure the connectors are properly
aligned with the pins. Check to be sure all pins are connected.
2. Dress the excess ribbon cable back under the GPIB board and insert the end
of the board with the gold contacts into the slot of the rear frame.
3. Align the spacers of the test fixture over the holes on the main circuit board.
a. Install two screws (210-0408-00) through the main board to both
spacers.
b. Install one screw (210-0408-00) through the rear frame to the nut block
on the GPIB board.
This completes the GPIB installation. Remove the GPIB test fixture and reinstall
the side covers after the adjustment procedure is complete.
18
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
AM 503B and AM 5030 Adjustments
The adjustment procedure consists of a series of steps to determine and set the
proper calibration constants of the AM 503B and AM 5030 Current Probe
Amplifiers.
NOTE. To set the internal calibration constants of the AM 503B amplifier, you
must install the GPIB test fixture. Refer to the procedure that begins on page 15.
Amplifier Setup
Set up the AM 503B or AM 5030 amplifiers as follows:
1. Plug the AM 503B or AM 5030 into the TM 5000 mainframe.
2. Power the amplifier on and let it warm up at least 20 minutes. The amplifier
must be calibrated at an ambient temperature between 25 ±5_ C.
3. Enable the Cal Mode of the amplifier by sending the following command
over the GPIB interface:
NOTE. You must send the command in order to load the calibration
constants.
4. On the AM 5030 amplifier only, send the query and verify that the
serial number is correct.
If the serial number of the AM 5030 amplifier is not correct, perform the
following steps:
a. Send the following command over the GPIB interface:
!
Be sure to hit the space bar twice before entering the serial number
(i.e. ).
b. Send the query again to verify that the serial number of the
AM 5030 is now correct.
AM 503B, AM 5030, and A6300 Series Verification and Adjustment
19
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