What to do if HP 3400A show incorrect AC signal at C413 and C415?
To troubleshoot an incorrect AC signal reading at the junction of C413 and C415 in HP Measuring Instruments, apply a 1 volt 400 Hz signal and set the 3400A to the 1 volt range. If the measured AC signal at the junction of C413 and C415 is not between 240 mV and 280 mV RMS, proceed to troubleshooting the Chopper Amplifier. If the reading is correct, proceed to the next step.
General| Brand | HP |
|---|---|
| Model | 3400A |
| Category | Measuring Instruments |
| Language | English |
Updates for serial ranges, schematic changes, and errata.
Minimize shock hazard by connecting chassis to electrical ground.
Do not operate in flammable gas/fume presence.
Do not remove covers; discharge circuits before touching.
Identifies and describes front panel controls and indicators.
Steps to power on the instrument, including warm-up.
Basic steps for using the instrument as a voltmeter.
Overview of the instrument's circuitry components.
Information for maintenance, checks, and calibration.
Lists required test equipment for maintenance.
In-cabinet tests to compare instrument to specifications.
Test setup and procedure for checking accuracy.
Complete procedures for calibration and adjustment.
Procedure to mechanically zero the meter pointer.
Checks power supply voltage and ripple tolerances.
Calibration for low frequency response.
Adjustment for the amplifier offset.
Calibrates for optimum response at high frequencies.
Adjusts amplifier gain for 90% full scale reading.
Adjusts input attenuator for frequency response.
Adjusts the second attenuator.
Procedures for isolating malfunctions.
Procedure to check thermocouple operation.
Depicts circuits within each assembly and interconnections.
Shows physical location of parts within assemblies.
Information for ordering replacement parts.
How to address orders or inquiries for parts.
Information to include when ordering unlisted parts.
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