What to do if Keysight 34401A Multimeter unit is inoperative?
If your Keysight Multimeter is inoperative: - Ensure the AC power cord is securely connected. - Verify that the front-panel power switch is pressed. - Check the power-line fuse to confirm it is functional. - Confirm the power-line voltage setting is correct.
Why Keysight Multimeter power supply has problems?
Power supply issues in your Keysight Multimeter can occur due to circuit failures causing heavy supply loads, which may pull down the regulator output voltage. Ensure the input to the supply voltage regulator is at least 1 V greater than its output. Also, verify that the local supplies are active and that component U403 is properly seated in its socket, as its failure can lead to self-test failures.
What to do if Keysight 34401A unit fails self-test?
If your Keysight Multimeter fails the self-test, first verify that the correct power-line voltage setting is selected. Also, ensure that all measurement terminal connections (both front panel and rear terminals) are removed while the self-test is performed.
General| Model | 34401A |
|---|---|
| Category | Multimeter |
| Manufacturer | Keysight |
| Display Digits | 6.5 digits |
| DC Voltage Range | 100 mV to 1000 V |
| AC Voltage Range | 100 mV to 750 V |
| Resistance Range | 100 Ω to 100 MΩ |
| Frequency Range | 3 Hz to 300 kHz |
| Frequency Accuracy | ±0.01% of reading |
| Interface | GPIB, RS-232 |
| Operating Temperature | 0 °C to 55 °C |
| Weight | 3.6 kg |
| Resolution | 100 nV |
| Dimensions | 88 mm x 213 mm x 348 mm |
| DC Current Range | 10 µA to 3 A |
| AC Current Range | 10 µA to 3 A |
Detailed accuracy specifications for DC voltage, resistance, and current measurements.
Accuracy specifications for AC voltage, current, and frequency response.
Specifications for measuring frequency and period of signals.
Overview of power, environment, EMI, warranty, and included accessories.
Explanation of key terms like digits, overrange, sensitivity, resolution, and accuracy.
Recommended settings for optimizing measurement accuracy.
Steps to verify the multimeter is ready for operation and perform initial checks.
Troubleshooting guide for power-related issues, including fuse and voltage settings.
Basic procedure for measuring DC and AC voltage using the multimeter.
Explanation of autoranging and manual ranging methods for selecting measurement ranges.
Instructions and kits for installing the multimeter in a standard 19-inch rack cabinet.
Detailed listing and description of all front-panel menu options and their functions.
Step-by-step guide on navigating the multimeter's front-panel menu structure.
List of recommended test equipment for performing calibration and verification.
Procedures for verifying the multimeter's performance against specifications.
Procedure to check and verify the zero offset performance of measurement functions.
Procedure to check the full-scale reading calibration for various functions and ranges.
How to set and use a security code to prevent unauthorized calibration.
Procedure for automatically adjusting the zero offset correction constants for all functions.
Procedure for adjusting gain correction constants for optimal measurement accuracy.
List of common error messages encountered during calibration and their meanings.
Overview of the multimeter's internal circuitry divided into floating and earth-referenced sections.
Explanation of the DC amplifier circuit used in most measurement functions.
Explanation of the AC measurement circuit, including filters and gain stages.
Description of the analog-to-digital conversion process using the multislope III method.
Overview of the multimeter's floating and earth-referenced power supply circuits.
A list of checks to perform before returning the multimeter for service or repair.
Essential guidelines to prevent ESD damage when servicing electronic components.
A checklist of common failures and basic troubleshooting steps for the multimeter.
Information on performing internal self-tests to verify hardware functionality.
Detailed list of replaceable parts for the main printed circuit board assembly.
Detailed list of replaceable parts for the front-panel display assembly.
Contact information and codes for various component manufacturers.
Table listing changes made to the multimeter with prior serial numbers for backdating purposes.
Diagrams illustrating the procedures for disassembling the multimeter's chassis and panels.
Diagram showing the physical location of components on the main PC board.
High-level block diagram illustrating the multimeter's main functional sections and interconnections.
Schematic of the DC amplifier and the ohms current source circuitry.
Schematic illustrating the AC measurement circuit, including filters and gain stages.
Schematic of the analog-to-digital conversion circuitry.
Schematic of the main CPU and related logic controlling instrument operation.
Schematic of the I/O processor and interface circuitry for rear panel communication.
Schematic of the floating and earth-referenced power supply circuits.
Schematic of the front panel display control and keyboard scanning circuits.
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