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General| Maximum Voltage | 1000 V |
|---|---|
| Maximum Current | 2 A |
| Operating Temperature | 0°C to 50°C |
| Weight | 2.5 kg |
| DC Voltage Range | 100mV to 1000V |
| DC Current Range | 0 to 2 A |
| AC Current Range | 0 to 2 A |
| Frequency Range | 20 Hz to 20kHz |
| Basic Resistance Accuracy | 0.01% |
| Dimensions | 216mm x 88mm x 280mm |
| Resistance Range | 200 Ω to 20 MΩ |
Manual provides operating instructions and service info for the 8842A.
Describes the 8842A as a high-performance 5-1/2 digit instrument.
Lists available options like IEEE-488 and True RMS AC, and accessories.
Details input characteristics and accuracy for DC Voltage, AC Voltage, Current, Resistance.
Covers installing the power-line fuse and connecting to line power.
Instructions for adjusting the handle for optimal viewing angles.
Details how to mount the 8842A in a standard 19-inch rack.
Covers power-up features and front/rear panel controls.
Explains how error messages are displayed and lists error codes.
Details the instrument's self-tests for digital and analog circuitry.
Explains selection between autorange and manual range.
How triggering executes a measurement cycle and the two modes.
Optimizing measurement speed vs. noise rejection.
General section on taking measurements.
Limits to avoid applying potentials that exceed overload limits.
Using the OFFSET feature to store a reading as a relative reference.
Cleaning the instrument case.
Section contains programming instructions for use with the IEEE-488 Interface (Option -05).
Lists capabilities of the IEEE-488 Interface, like remote control and programmability.
Steps to set up the 8842A on the IEEE-488 bus.
Details commands corresponding to front panel controls and functions.
Get commands retrieve instrument information and status.
Put commands set up configuration and operating modes by entering registers.
Describes how to construct command groups and processes input commands.
Describes data loaded into the output buffer and sent to the IEEE-488 bus.
How bus instruments get attention from the controller via SRQ line.
Categories of interface messages (address, universal, addressed).
Lets 8842A operate remotely without a controller.
Calibrating the 8842A remotely via IEEE-488.
Example programs for 8842A using various controllers.
Section discusses considerations and techniques for effective 8842A use and error sources.
Discusses sources of error in DC voltage measurements: circuit loading and input bias current.
Explains measuring resistance in 2-wire and 4-wire configurations.
Discusses uses of 2-wire and 4-wire ohms functions beyond basic measurement.
Describes the ohms current source as a troubleshooting tool and for meter testing.
Discusses burden voltage error in DC current measurements.
Techniques for minimizing errors from thermal voltages.
Considerations for AC measurements including rms, crest factor, bandwidth.
Explains crest factor and its importance for waveform measurement.
Advantages of AC coupling for measurements.
How to evaluate total RMS value of waveforms with AC and DC components.
Explains non-zero readings when VAC input terminals are shorted.
Practices for accurate low-level measurements, minimizing noise and errors.
Techniques to minimize leakage and noise in high-resistance measurements.
Section presents overall functional and detailed circuit descriptions.
Provides a block diagram of the 8842A signal path and main functions.
Details circuits for DC Scaling, T/H, Digital Controller, Power Supply, etc.
Explains scaling for DC inputs and input protection/filtering.
Explains the Track/Hold circuit's function and components.
Describes the precision voltage reference providing stable reference voltages.
Explains the Ohms Current Source providing precise test current.
Details OHMS Protection circuit for input overvoltage and transients.
Explains the Analog-to-Digital converter and its technique.
Overview of the Digital Controller's components and function.
Details the power supply circuit providing various voltage outputs.
Explains the IEEE-488 Interface block diagram and components.
Explains the True RMS AC circuit's scaling and conversion functions.
Practices to minimize damage to static-sensitive devices during handling.
Guidelines for safe handling using anti-static workstations and tools.
Section covers performance test, calibration, troubleshooting, and service info.
Compares instrument performance to specifications; recommended post-calibration.
Checks analog and digital circuitry, including memory and display tests.
Procedure to verify accuracy of the VDC function.
Procedure to verify accuracy of the VAC function for Option -09.
Procedure to verify accuracy of 2-wire and 4-wire ohms functions.
Procedure to test the mA DC function accuracy.
Procedure to test the mA AC function for Option -09.
Covers basic, offset/gain, and HF AC calibration procedures.
Procedure to erase calibration memory.
Calibrating the 8842A remotely via IEEE-488.
Remotely erasing the entire calibration memory.
Procedures for disassembling the instrument.
Steps to reassemble the instrument after disassembly.
Procedure for replacing the internal fuse.
General approach to troubleshooting and available tools.
Troubleshooting the digital controller and its subsystems.
Troubleshooting steps for the DC Scaling circuit.
Troubleshooting steps for the Track/Hold circuit.
Troubleshooting steps for the Ohms Current Source.
Troubleshooting steps for the Precision Voltage Reference.
Troubleshooting steps for the A/D Converter.
Troubleshooting steps for the power supply.
Troubleshooting the IEEE-488 Interface.
Using the diagnostic program for troubleshooting the IEEE-488 Interface.
Troubleshooting the True RMS AC Option.
Troubleshooting the Guard Crossing circuit.
Precautions for internal cleaning of the instrument.
Section contains an illustrated list of replaceable parts for the 8842A.
Information on ordering electrical components directly from the manufacturer or representatives.
Location of authorized service centers.
Summarizes available options and accessories enhancing 8842A capabilities.
Lists and describes various accessories like rack kits, cables, probes, and leads.
Details how to mount the 8842A in standard 19-inch rack panels.
Describes available shielded IEEE-488 cables in various lengths.
TL70A replacement test leads feature safety-designed input connectors.
Includes test-tip probes, alligator clips, spade lug tips, and hook tip.
Adjustable, flexible leads for fitting into small places.
Universal probes for temperature measurement and conversion.
Probes for measuring radio frequency AC signals.
Extends AC or DC current measurement range up to 10A continuous.
Extend AC and DC current measurement range using Hall effect or transformer.
Extend DC and AC voltage measurement range, minimizing shock hazard.
Introduces the IEEE-488 Interface option for programmable instrument use.
Lists the capabilities of the IEEE-488 Interface, including remote control.
Describes rear panel EXT TRIG and SAMPLE COMPLETE connectors.
Provides step-by-step instructions for installing the IEEE-488 PCA.
Presents programming instructions and IEEE-488 bus setup.
Service information for the IEEE-488 Interface is in Section 6.
List of replaceable parts for the IEEE-488 Interface PCA.
Introduces the True RMS AC option for AC voltage and current measurements.
Provides step-by-step instructions for installing the True RMS AC PCA.
Refers to Section 2 for operating instructions and Section 4 for AC measurements.
Service information for Option -09 is in Section 6; theory of operation in Section 5.
List of replaceable parts for the True RMS AC PCA.
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