General Information
371B Service Manual
2-9
This instrument operates from a single-phase power source, and has
a detachable three-wire power cord with a two-pole, three-terminal grounding
plug. The voltage to ground (earth) from either pole of the power source must
not exceed the maximum rated operating voltage (250 Vrms).
Before making connection to the power source, make sure that the instrument is
set for the power source voltage, and is equipped with a suitable plug (two-pole,
three-terminal, with ground).
This instrument is IEC Safety Class 1 equipment. All accessible conductive parts
are directly connected through the grounding conductor of the power cord to the
grounding contact of the power plug. Therefore, the power plug must only be
inserted in a mating receptacle with a grounding contact. Do not defeat the
grounding connection. Any interruption of the grounding connection can create
an electric shock hazard.
Refer to Table 2–2 if a power cord other than the one supplied is required.
The 371B can be operated where the ambient temperature is b10
_
C and
+40
_
C. After storage at temperatures outside the operating limits, allow the
chassis temperature to reach the safe operating limits before applying power.
The instrument is cooled by air drawn in through the air filter on the rear panel
and blown out through holes in the side panels. For proper instrument cooling,
provide adequate clearance of at least two inches on the rear and sides to ensure
free air flow and dissipation of heat away from the unit.
Prolonged use of the 371B can cause high temperatures which may
damage the instrument or DUT. When applying current in the 3 kW range of the
peak power watts selector, test time should be limited to four minutes, followed
by at least 11 minutes of cooling.
Prolonged use of the 371B at high power settings can make the device
under test, test fixture unit, or protective cover hot enough to cause injury. Avoid
touching any of these areas until cooled.
Operating Temperature
and Cooling
Summary of Contents for 371B
Page 4: ......
Page 14: ...Service Safety Summary 371B Service Manual...
Page 18: ...Preface 371B Service Manual...
Page 21: ...Specifications...
Page 22: ......
Page 24: ...Product Overview 371B Service Manual...
Page 38: ...Specifications 371B Service Manual...
Page 39: ...General Information...
Page 40: ......
Page 58: ...General Information 371B Service Manual...
Page 59: ...Theory of Operation...
Page 60: ......
Page 62: ...Theory of Operation 3 2 371B Service Manual Figure 3 1 371B Block Diagram...
Page 71: ...Maintenance...
Page 72: ......
Page 101: ...Performance Verification...
Page 102: ......
Page 220: ...Performance Verification 371B Service Manual...
Page 221: ...Options...
Page 222: ......
Page 226: ...Options and Accessories 371B Service Manual...
Page 227: ...Electrical Parts List...
Page 228: ......
Page 235: ...Diagrams...
Page 236: ......
Page 237: ...8 1 371B Service Manual Circuit Board Interconnections 2 2...
Page 238: ...371B Service Manual...
Page 239: ...8 3 371B Service Manual Circuit Board Interconnections 2 2...
Page 240: ...371B Service Manual...
Page 241: ...8 5 371B Service Manual Test Point Adjustment Locations 1...
Page 242: ...8 6 371B Service Manual Test Point Adjustment Locations 2...
Page 243: ...8 7 371B Service Manual Test Point Adjustment Locations 2...
Page 244: ...8 8 371B Service Manual Test Point Adjustment Locations 3...
Page 245: ...8 9 371B Service Manual Troubleshooting Tree...
Page 246: ...8 10 371B Service Manual Troubleshooting Tree Cont...
Page 247: ...8 11 371B Service Manual Troubleshooting Tree Cont...
Page 248: ...371B Service Manual...
Page 249: ...Mechanical Parts List...
Page 250: ......
Page 259: ...9 9 371B Service Manual Figure 9 1 Cabinet Rear 97 96 68...
Page 260: ...371B Service Manual...
Page 261: ...9 11 371B Service Manual Figure 9 2 Display Front 73...
Page 262: ...371B Service Manual...
Page 267: ...9 17 371B Service Manual Figure 9 3 Chassis Ciircuit Board...
Page 268: ...371B Service Manual...
Page 269: ...9 19 371B Service Manual Figure 9 4 Power Supply...
Page 270: ...371B Service Manual...
Page 276: ...Mechanical Parts List 371B Service Manual...
Page 277: ...9 27 371B Service Manual Figure 9 5 Test Fixture 78 78 REV MAR 96 75 72...
Page 278: ...371B Service Manual...
Page 279: ...9 29 371B Service Manual Figure 9 6 Front Porch...
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Page 289: ...371B Service Manual 6 5...
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