HP 400FL User Manual

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HP 400FL Specifications

General

Brand	HP
Model	400FL
Category	Measuring Instruments
Language	English

Summary

SECTION I GENERAL INFORMATION

1-1. Description

Provides a general overview of the Model 400F/FL AC voltmeters and dB meters.

SECTION II INSTALLATION

2-1. Introduction

2-3. Initial Inspection

2-5. Power Requirements

Details the power sources (line or battery) and power dissipation for the instrument.

2-7. Grounding Requirements

Explains the importance and method of grounding the instrument for personnel safety.

2-18. Repackaging for Shipment

SECTION III OPERATING INSTRUCTIONS

3-1. Introduction

Contains instructions and information necessary for operating the 400F/FL AC Voltmeters.

3-3. Controls, Indicators and Connectors

Identifies and describes each control, indicator, and connector on the 400F/FL.

3-5. Meter Mechanical Zero Adjustment (400F Only)

3-7. Turn-On Procedures

Step-by-step instructions for powering on the instrument using line voltage or batteries.

3-8. AC Voltage Measurements

Instructions for performing AC voltage measurements, noting distortion effects.

3-9. DC Measurements

Instructions for performing DC measurements and interpreting results.

3-10. Wide Band AC Amplifier

Details on using the instrument as a wide band AC amplifier, including gain and bandwidth adjustments.

SECTION IV THEORY OF OPERATION

4-1. General

4-3. Block Diagram Description

4-5. Schematic Theory

4-27. Power Supply

Details the instrument's power supply, providing positive and negative regulated outputs.

SECTION V MAINTENANCE

5-1. Introduction

5-3. Test Equipment Required

Lists the necessary test equipment and their specifications for maintaining the 400F/FL.

5-5. Performance Checks

Guides for comparing instrument accuracy with specifications for inspection and maintenance.

5-12. Accuracy and Frequency Response Checks

Procedures to check accuracy and frequency response across the entire range of the instrument.

5-14. Range Tracking Check

Procedures for verifying the range tracking of the instrument after calibration.

5-16. Input Impedance Check

5-17. Input Resistance Check

5-18. Input Capacity Check

5-19. Alignment and Calibration Procedures

Guides for performing alignment and calibration to ensure accurate meter indications.

5-28. Meter Calibration

Procedures to adjust amplifier gain for accurate meter indications across voltage and frequency ranges.

5-30. Meter Calibration, 30 MV Range

Detailed steps for calibrating the meter amplifier on the 30 mV range.

5-31. Meter Calibration, 0.1 MV Range

Detailed steps for calibrating the meter amplifier on the 0.1 mV range.

5-32. Attenuator Alignment

Procedures for properly aligning the input attenuator at high and low frequencies.

5-34. A2Q1 Bias Adjustment

5-39. Troubleshooting Procedure

Guides for troubleshooting instrument malfunctions after calibration attempts.

5-44. Power Supply

Instructions for checking power supply outputs and related components.

5-46. Amplifiers

Guidance on measuring DC voltages in the preamplifier and meter amplifier stages.

5-48. Meter Bridge

5-50. Etched Circuit Board Repair

SECTION VI SCHEMATICS

6-1. Introduction

Figure 6-1. Model 400F/FL Range Switch and p/o Internal Wiring Data

Figure 6-2. Model 400F/FL Component Location

Figure 6-3. Model 400F/FL Schematic Diagram

The main schematic diagram of the 400F/FL, identifying signal and feedback paths.

SECTION VII REPLACEABLE PARTS

7-1. Introduction

MANUAL CHANGES