Maintenance
Replacement of Selected Components
4
4-17
Table 4-4. Replacement Resistors for R11 and R12
DVM Reading (
±
mV dc)
Selected Value for R11/R12
Fluke Part Number
0.87 to 0.174
1.00 k
Ω
168229
0.175 to 0.261
2.00 k
Ω
235226
0.262 to 0.348
3.01 k
Ω
312645
0.349 to 0.435
4.02 k
Ω
235325
0.436 to 0.522
4.99 k
Ω
168252
0.523 to 0.609
6.04 k
Ω
285189
0.610 to 0.696
6.98 k
Ω
261685
0.697 to 0.783
8.06 k
Ω
347229
4-40. Resistor
R13
Resistor R13 is associated with the DC Accuracy Adjustment procedure and the setting
of the GAIN ADJ potentiometer R3. Use the following procedure to select the proper
replacement for R13:
1.
Disconnect the 5220A from line power.
2.
Remove the top and large inner covers from the unit.
3.
Connect the precision shunt (.01 ohm) to the enabled output terminals of the 5220A.
4.
Connect the DVM to the sense terminals on the precision shunt; observe polarity. Set
the DVM to the 100 mV range and zero the d/-.001 mV.
5.
Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals
on the 5220A; positive to red, negative to black.
6.
Adjust R3 on the A5 Preamplifier to its full cw limit.
7.
Install a shorting wire across R13 on the A5 Preamplifier PCB Assembly.
8.
Connect the 5220A to line power and set the POWER switch to ON.
9.
Set the calibrator for an output of +10.0000 V dc.
10.
Set the 5220A to the operate mode.
11.
Determine the actual value of the precision shunt (calibrated value) and subtract it
from .01 ohms. Multiply this difference by 10,000 and record the result.
12.
Record the displayed DVM reading in mV and add the result of step 11 from the
reading. Use this corrected DVM reading in conjunction with Table 4-5, to select the
value of R13.
For example:
Given: Shunt Value = .0100123
Ω
DVM Reading = 101.041 mV dc
Corrected DVM Reading = 101.041 + 10000 (.01-.010012)
Corrected DVM Reading = 100.918 mV dc
R13 = 698 ohms (see Table 4-5.)
13.
Set the POWER switch on the 5220A to OFF and replace R13 on the A5 Preamplifier
PCB with the selected value.
14.
Perform the Calibration Adjustment procedures.
Содержание 5220A
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Страница 11: ...Contents continued ix...
Страница 12: ...5220A Instruction Manual x ajs36f eps 5220A Transconductance Amplifier...
Страница 17: ...Introduction and Specifications Specifications 1 1 5 ajs01f wmf Figure1 1 Outline Drawings...
Страница 18: ...5 220A Instruction Manual 1 6...
Страница 21: ...Operating Instructions Operating Features 2 2 3 ajs02f wmf Figure 2 1 Controls Indicators and Connectors...
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Страница 30: ...5 220A Instruction Manual 3 2 ajs05f wmf Figure 3 1 5220A Functional Block Diagram...
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Страница 65: ...Maintenance Troubleshooting 4 4 19 ajs17f wmf Figure 4 3 Test Point Location Identification...
Страница 70: ...5 220A Instruction Manual 4 24 ajs19f wmf Figure 4 5 Flowchart Summary of Analog Section Troubleshooting Guide...
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Страница 81: ...List of Replaceable Parts Service Centers 5 5 9 ajs21f wmf Figure 5 1 5220A Final Assembly cont...
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Страница 85: ...List of Replaceable Parts Service Centers 5 5 13 ajs25f wmf Figure 5 1 5220A Final Assembly cont...
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Страница 87: ...List of Replaceable Parts Service Centers 5 5 15 ajs27f wmf Figure 5 1 5220A Final Assembly cont...
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Страница 92: ...5 220A Instruction Manual 5 20 ajs38f wmf Figure 5 4 A3 Capacitor Bus PCB Assembly...
Страница 94: ...5 220A Instruction Manual 5 22 ajs39f wmf Figure 5 5 A4 Regulator PCB Assembly...
Страница 97: ...List of Replaceable Parts Service Centers 5 5 25 ajs40f wmf Figure 5 6 A5 Preamplifier PCB Assembly...
Страница 101: ...List of Replaceable Parts Service Centers 5 5 29 ajs42f wmf Figure 5 8 A7 Output PCB Assembly...
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Страница 104: ...5 220A Instruction Manual 5 32 ajs44f wmf Figure 5 9 A8 Analog Control PCB Assembly...
Страница 107: ...List of Replaceable Parts Service Centers 5 5 35 ajs30f wmf Figure 5 11 A10 Logic PCB Assembly...
Страница 109: ...List of Replaceable Parts Service Centers 5 5 37 ajs31f wmf Figure 5 12 A11 MIS Bus PCB Assembly...
Страница 111: ...List of Replaceable Parts Service Centers 5 5 39 ajs32f wmf Figure 5 13 A12 Shunt Assembly...
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Страница 116: ...5 220A Instruction Manual 6 2 ajs45f wmf Figure 6 1 Rack Mounting Kit...
Страница 118: ...5 220A Instruction Manual 6 4 ajs46f wmf Figure 6 2 Rack Slide Kit...
Страница 119: ...7 1 Chapter 7 Schematic Diagrams...
Страница 120: ...5220A Instruction Manual 7 2 5220A 1001 Sheet 1 of 2 ajs47f wmf Figure 7 1 Interconnect Diagram...
Страница 121: ...Schematic Diagrams 7 7 3 ajs48f wm Figure 7 1 Interconnect Diagram cont...
Страница 122: ...5220A Instruction Manual 7 4 ajs49f wmf Figure 7 2 Chassis Wiring...
Страница 123: ...Schematic Diagrams 7 7 5 ajs50f wmf Figure 7 2 Chassis Wiring cont...
Страница 124: ...5220A Instruction Manual 7 6 ajs51f wmf Figure 7 3 Power Supply...
Страница 125: ...Schematic Diagrams 7 7 7 ajs52f wmf Figure 7 3 Power Supply cont...
Страница 126: ...5220A Instruction Manual 7 8 ajs53f wmf Figure 7 4 A5 Preamplifier PCB Assembly...
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Страница 128: ...5220A Instruction Manual 7 10 ajs55f wmf Figure 7 5 A6 Driver and A7 Output PCB Assemblies...
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Страница 130: ...5220A Instruction Manual 7 12 ajs57f wmf Figure 7 6 A8 Analog Control PCB Assembly...
Страница 131: ...Schematic Diagrams 7 7 13 ajs58f wmf Figure 7 6 A8 Analog Control PCB Assembly cont...
Страница 132: ...5220A Instruction Manual 7 14 ajs59f wmf Figure 7 7 A9 Front Panel PCB Assembly...
Страница 133: ...Schematic Diagrams 7 7 15 ajs60f wmf Figure 7 7 A9 Front Panel PCB Assembly cont...
Страница 134: ...5220A Instruction Manual 7 16 ajs61f wmf Figure 7 8 A10 Logic PCB Assembly...
Страница 135: ...Schematic Diagrams 7 7 17 ajs62f wmf Figure 7 8 A10 Logic PCB Assembly cont...
Страница 136: ...5220A Instruction Manual 7 18 ajs63f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly...
Страница 137: ...Schematic Diagrams 7 7 19 ajs64f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly cont...
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