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Electronic Measurement

Find by Product Model Number: Examples: 34401A, E4440A

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Where can I find manuals for discontinued and obsolete Hewlett-Packard, Agilent and Keysight test equipment?
Most Keysight products have PDF manuals that can be found on product pages. Other vendors also supply old manuals.

FAQ 2014-08-01

Can I have multiple math functions (Null, Min-Max, dB, dBm, Limit) on at the same time on the 34401A?
No, the 34401A only allows one math function to be used at a time.

FAQ 2014-04-15

How do I rack mount two instruments of different depths?
There are three ways to rack instruments of different depths side-by-side; for example, a Keysight 33220A with a Keysight 34401A.

FAQ 2010-10-12

How does excessive heat and cold affect the accuracy of Keysight 34401A measurements?
This can be determined by using the temperature coefficients published in the User's Guide. Notice the "Temperature Coefficient/degree C" column…

FAQ 2010-07-23

What type of calibration certificate is shipped with the 34401A? How do I disable the secure mode for calibration? How often is calibration require...
The Keysight 34401A ships with a NIST (National Institute of Standards and Technology) traceable certificate of calibration.

FAQ 2010-07-23

What programming languages does the Keysight 34401A accept?
By default, the Keysight 34401A recognizes the SCPI programming language.

FAQ 2010-05-16

Does the Keysight 34401A measure "true RMS" ac voltage and ac current?
Yes. The Keysight 34401A uses an analog conversion technique that gives true RMS readings regardless of waveshape as long as the signal is within the bandwidth and crest factor of the 34401A.

FAQ 2009-11-30

Can I measure temperature with the Keysight 34401A?
Most temperature sensors convert temperature to a corresponding resistance (thermistors and RTDs) or low-level dc voltag (thermocouples).

FAQ 2008-04-03

What types of memory are installed into the Keysight 34401A Digital Multimeter?
Please refer to the document linked to this page for a comprehensive listing of internal memory for the 34401A digital multimeter.

FAQ 2006-11-03

Does the Keysight 34401A use "AC" or "DC" coupling for AC voltage measurements?
The Keysight 34401A uses an AC-coupled input when measuring ACV, which means that the DC component is blocked and is not included in the measurement.

FAQ 2005-05-02

How do I calculate total measurement error on the Keysight 34401A?
The accuracy specifications for the Keysight 34401A are expressed in the form: '% of reading + % of range' which match the dominate sources of error, gain and offset.

FAQ 2005-02-09

What is the sample rate of the Keysight 34401A?
When configured for the fastest reading rate, the 34401A can sample at 1000 readings/second.

FAQ 2005-02-09

What is aperture time of the 34401A?
Aperture time is analogous to integration time or Number of Power Line Cycles (NPLCs).

FAQ 2005-02-09

Does the Keysight 34401A have a LAN IO Connection?
No. However, if you require Local Area Network (LAN) connectivity, consider the Keysight E5810A LAN-to-GPIB gateway.

FAQ 2004-09-23

Is there a way to measure low-level ac current using the Keysight 34401A?
Yes. The lowest specified measurement on the 1 A ac current range is 1% of the range, or 10 mA (see footnote 4 in the Data Sheet).

FAQ 2004-06-10

How do I view min-max values with the Keysight 34401A?
You can store the minimum and maximum readings during a series of measurements. The following discussion shows how to read the minimum, maximum, average, and reading count.

FAQ 2003-12-04

What is the part number for the User's Guide and Service Guide for the Keysight 34401A?
The part number for the English set of manuals including both the User's Guide and Service Guide is 34401-90100. The User's Guide and Service Guide are not sold separately.

FAQ 2003-11-04

Why does the "trig:coun inf" command produce error 531:Insufficient Memory?
You have programmed the meter to store the readings in the internal memory. The internal memory will only hold 512 readings therefore you get the error.

FAQ 2003-06-04

What are the advantages of 4-wire resistance measurements with the Keysight 34401A?
Lead resistance is not included in the measurement results when using four wire ohms. Thus the accuracy is higher especially for small resistances.

FAQ 2003-06-04

Why do I see a real value during a 4-wire ohm measurement when the test leads are open on the Keysight 34401A?
When making 2 wire ohm measurements the source and sense leads are connected together internally and can be driven into an overload situation.

FAQ 2003-06-04

What is the voltage limit that is considered open for diode testing?
The 34401A diode test function was designed specifically for silicon diodes. The cutoff voltage for diode testing is 0.8 VDC.

FAQ 2003-06-04

When performing a measurement count query (SAMPLE:COUNT?) command, are the math functions reset in any way?
No. The stored values are only cleared when you turn the min-max function off, turn off the power, or perform a remote interface reset.

FAQ 2003-06-04

What are the part numbers for rack mounting the Keysight 34401A?
In order to maintain a consistent appearance across all Keysight Technologies products, the exterior color of the Keysight 34401A was changed in late 1996.

FAQ 2003-06-04

How do I enable the Keysight 34401A to make dBm measurements over the bus?
First, select the dBm function using the following command: CALCulate:FUNCtion DBM

FAQ 2003-06-04

Is the current path uninterupted during measuement range changes in the Keysight 34401A?
An open circuit does not occur when range changes are made during an autorange function. When the range changes, a 0.1 Ohm resistance is switched in parallel with the current shunt resistor.

FAQ 2003-06-04

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