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2 Agilent U1251B/U1252B User’s and Service Guide
1 Getting Started Tutorial
Introducing the U1251B/U1252B Handheld Digital Multimeter
Key features of this digital multimeter:
• DC, AC and AC + DC (U1252B only) voltage and current
measurements.
• True- RMS measurement for both AC voltage and current
• Rechargeable Ni- MH battery with built- in charging
capability (U1252B only)
• Ambient temperature on second display
• Battery capacity indicator
• Bright orange LED backlight
• Resistance measurement of up to 50 MΩ (for U1251B)
and 500 MΩ (for U1252B)
• Conductance measurement from 0.01 nS (100 GΩ)
~ 50 nS
• Capacitance measurement of up to 100 mF
• Frequency counter of up to 20 MHz (U1252B only)
•
The % scale readout for 4–20 mA or 0–20 mA measurement
• dBm with selectable reference impedance
• 1 ms Peak Hold to catch inrush voltage and current easily
• Temperature test with selectable 0
°C compensation
(without ambient temperature compensation).
• K- type (for U1251B) and J/K- types temperature
measurement (U1252B only)
• Frequency, duty cycle, and pulse width measurements
• Dynamic Recording for min, max, and average readings
• Data Hold with manual or auto trigger and Null mode
• Diode and audible continuity tests
• Square wave generator with selectable frequency, pulse
width and duty cycle (U1252B only)
• Agilent GUI Application Software (IR- USB cable sold
separately)
• Closed case calibration
- Agilent U1251B and 1
- U1252B Handheld Digital 1
- Multimeter 1
- Safety Symbols 3
- Safety Information 4
- General Safety Information 4
- Regulatory Markings 6
- 2002/96/EC 7
- In This Guide… 8
- Contents 11
- 3 Functions and Features 12
- 7 Specifications 14
- List of Figures 17
- List of Tables 19
- Getting Started 21
- °C compensation 22
- Check the shipment 23
- Adjusting the tilt-stand 24
- The front panel at a glance 26
- The rear panel at a glance 27
- The rotary switch at a glance 28
- The keypad at a glance 29
- 1 Getting Started Tutorial 30
- The display at a glance 31
- Getting Started Tutorial 1 33
- for U1251B 40
- The terminals at a glance 42
- Making Measurements 43
- Measuring Voltage 44
- Measuring AC voltage 45
- Measuring DC voltage 46
- Making Measurements 2 47
- Measuring Current 49
- Red Lead 50
- Black Lead 50
- 2 Making Measurements 50
- A (ampere) measurement 53
- Frequency Counter 54
- Audible continuity 58
- Conductance 58
- Testin g Diodes 60
- Measuring Capacitance 63
- Measuring Temperature 65
- Overload alert 69
- Input warning 69
- Charge terminal alert 70
- Functions and Features 71
- Dynamic Recording 72
- Data Hold (Trigger Hold) 74
- Refresh Hold 75
- Null (Relative) 77
- Decibel Display 79
- 1 ms Peak Hold 81
- Press for > 1 sec 82
- Data Logging 83
- Interval logging 85
- Reviewing logged data 87
- Remote Communication 93
- 3 Features and Functions 94
- Changing The Default Setting 95
- Selecting Setup Mode 96
- Setting Data Logging Mode 101
- Setting Temperature Unit 105
- Setting Beep Frequency 110
- Setting Backlight Timer 111
- Setting Baud Rate 112
- Setting Parity Check 113
- Setting Data Bit 114
- Setting Echo Mode 115
- Setting Print Mode 116
- Setting the Battery Voltage 118
- Setting the Filter 119
- Table 4-2 Filter defaults 120
- Maintenance 121
- Introduction 122
- Storage considerations 124
- Charging the battery 125
- 5 Maintenance 128
- Figure 5-3 Self-test 128
- Table 5-2 Error messages 128
- and appear to 130
- Maintenance 5 131
- Fuse checking procedure 132
- Displayed readings 133
- 1 440 mA/1000 V 6.2 MΩ OL 133
- 2 11 A/1000 V 0.06 Ω OL 133
- Replacing the fuse 134
- Troubleshooting 136
- Replaceable Parts 137
- Agilent Technologies 139
- Calibration Overview 140
- Calibration interval 141
- Adjustment is recommended 141
- Recommended Test Equipment 142
- Basic Operating Test 143
- Current terminal test 144
- Charge terminal alert test 145
- Test Considerations 146
- Calibration Security 147
- Error from nominal 1 year 151
- U1251B U1252B 151
- ± 350 mW 152
- Calibration Process 159
- Selecting the Adjustment Mode 160
- Entering Adjustment Values 160
- Adjustments Consideration 161
- Adjustment Procedure 163
- position 166
- Finishing the Adjustment 170
- Calibration Errors 171
- Specifications 173
- Product Characteristics 174
- Specifications 7 175
- Measurement Category 177
- Specification Assumptions 178
- Electrical Specifications 178
- ≤ reading ≤ 0.8 V) 180
- AC Specifications 181
- AC specifications for U1252B 182
- Capacitance Specifications 184
- Temperature Specifications 184
- Frequency Specifications 185
- For voltage measurements 186
- For current measurements 187
- Peak Hold Specifications 188
- [2][4][5] 189
- [2][4][6] 189
- Operating Specifications 191
- Input impedance 192
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