DMM Keysight 34461A 6 digit

DSC_1691

This is a fairly expensive 6 digit bench multimeter from a top quality brand.
This meter has many possibilities and I will not cover everything it can do.

DSC_1689 DSC_1688

It arrives in a big very solid cardboard box with the DMM well protected inside and a box with all the accessories.
It includes a calibration certificate, this list the reading and the error at many different calibration points and the date this was measured.

DSC_1715

In the accessories box is probes, mains cable, CD with manual and a bit of documentation. The manual can be downloaded from Keysight (It is nearly 600 pages in English).

DSC_1716

The probes includes a few accessories.

DSC_1717

Standard probe, note that this probe is a fairly low safety rating, like the DMM (CAT II).

DSC_1718

With extended probe tip.

DSC_1719

With hook.

DSC_1721

There is two types of hooks included.

DSC_1692

DSC_1693 DSC_1714

The meter can be used in multiple position, the flat position is often used to stack it with other equipment. It can also be used floor standing. It is possible to buy a bracket for mounting one or two meters in a rack.

DSC_6769

The front has the display, the buttons and one set of inputs.

DSC_1695
DSC_1696

On the back is another set of input and a few other connections, including the mains input.
There is also a cover for the optional GPIB interface.



Display

DSC_1725 DSC_1726
DSC_1727

This meter is a computer that needs some time to boot and do self test, during that time it shows a couple of boot screens.

DSC_1724

Typical display when measuring without any of the more advanced stuff activated.

DSC_1728 DSC_1729

Secondary display enabled and showing AC (When showing DC & AC a relay inside the meter will toggle). The statistic can show max/min/average and a bit more.

DSC_1730

A bar can be added to the display.

DSC_1731 DSC_1732

There is also some modes where it shows the data graphically.

DSC_1734 DSC_1735

Ohm can be done both as two wire or four wire, difference here is about 30mOhm due to the cables.



Functions

DSC_1739

DSC_1738

The buttons beside the screen select the basic function, all adjustment and settings are done with these 6 soft keys. There are settings for each function (DCV/DCI/ACV/....). Display do also have many interesting settings for the different function.
The Probe Hold, Math, Utility and Acquire have more general setting, many of them related to the actual measurements.

DSC_1737

On the other side of the display is the power button, this is a soft power button.
The usb connector can be used to save settings and screen captures.



Input

The inputs are only CAT II 300V rated, i.e. the meter is not designed for installation and service on electric installations.

DSC_1740
DSC_1759

Rear input terminals, the 10A input is replaced with a fuse for the 3A range. This is a "normal" 20mm fuse (Inside the meter is a big high current 3A fuse).
The trig input is used to start a measurement (Usual it will start automatic) and "VM Comp" signals when a measurement is done.
The LAN and USB connectors is for controlling and reading values from the meter.




Measurements 1uF

A look at the capacitance measurement waveform.

DMMschema



Software

1

A installed meter will show up in device manager as a "USB Test and Measurement Device".

No software is included with the meter, but there is a manual describing how to communicate with it.
Keysight sells a software that can integrate all of their advanced instruments, it is called "BenchVue". The licensing of this software is fairly advanced with payment for instrument types, functions, period.

5s

When starting the software it shows all the equipment it can find, double click on something to use it.

6s

But you cannot just use it, a special application for the type device must first be downloaded and installed, this is basically automatic and you get a trial period, but to continue using it a license fee must be paid.

7s

One multimeter is started, I can control the settings and see the actual value on the meter.

8s

Or I can switch to the data logger.

9s

The data can be exported as screen dump or CSV files.

data

The CSV file uses the correct format (For my location) and includes a header with some information about the meter and settings.

10s

In BenchVue it is possible to run many instruments simultaneous and make scripts (With blocks) for automating tests.

2s

When doing your own software it is possible to use Keysight Command Expert to help building the commands. This software can also work in demo mode, i.e. without any instruments connected to the computer.
Before it can be used Keysight IOLibSuite must be installed, including a license manager. Both software packages are free.

3s

The software knows all commands each instrument supports (It will download a file for it) and it is possible to visually build configuration and queries for a instrument.

4s

The result can then be exported in a couple of formats.



Tear down

DSC_1698

3 screws and the cover could be removed.

DSC_1699

On the circuit board the front/back switch can be seen and the two large fuses for the current range.
There is some relays to switch between functions.

DSC_1705

The shield over the circuit board can be removed with one screw (It is a bad idea to touch the circuit board). The white round device on the circuit board is the voltage reference.

DSC_1700

A closer look at the backend, there is a connector for the GPIB interface.

DSC_1701

Behind the front panel is some electronic and a battery for the real time clock.

DSC_1702

DSC_1710

DSC_1703

There is a single big chip on the bottom of the circuit board and again it is shielded.

DSC_1708

This shield is removed with the same screw as the top shield.

DSC_1709



Conclusion

Bench DMM's is fairly expensive, this model is at the cheap end for good bench meters from a premium brand. What you get with the bench meter is precision, connectivity, speed and some functions that is missing from handheld DMM's (It is also missing some functions that are common on handheld meters). The range with best precision on DMM's is the DC voltage, current and AC has less precision. On this meter capacitance is an afterthought (It was not even present on the first batch).
Generally benchmeters are only CAT II 300V rated, they are not supposed to be used "out in the wild".

I like this meter and compared to a top of the line handheld DMM it is not that expensive but can do much more.



Notes

Keysight has four bench multimeters: 34460A, 34461A, 34465A and 34470A, each higher number has a bit better precision and a few more functions. For all of them it is possible to buy more functions (But you cannot buy upgrade to next model).

I uses a couple of these meter for many of my tests together with some software I have written.

How do I review a DMM
More DMM reviews