Hi. I'd like to compare the N6705A DC Power Analyzer mainframe with the N6705B DC Power
Analyzer mainframe. So first of all, the DC Power Analyzer was first introduced in May
of 2007. In June of 2010, we introduced the N6705B mainframe, which is replacing the N6705A
mainframe. So the N6705B mainframe supports all of the modules that the N6705A mainframe
supported. However, two additions to this is the N6753A 300-watt, 20-volt, 50-amp module.
So the B mainframe now supports that module in addition to the N6780 Source/Measure Unit,
or SMU, modules. Let's go ahead and take a look at the front panel. You can see that
it looks very similar to the N6705A. One of the key changes we did make was behind these
front-panel posts. So behind these binding posts, we actually lowered the capacitance
to accommodate some of the newer modules, the N6780 modules, that have faster transient
response and better programming accuracy. In addition, the second big thing we've changed
on the front panel is we've added secondary functions. So there are a few cosmetic differences here.
Here, we have the auto-scale function clearly labeled under the Trigger Level pushbutton knob.
So if you turn this knob to the left or to the right, you can change the trigger
level in either scope view or data logger. However, if you push this button, it also
auto scales as a function in the scope view or the data logger. Now let's take a look
at the rear panel. So as you can see here, we have the B mainframe on top and the A mainframe
on the bottom. Again, just like the front panel, the rear panels are very similar.
You still have the same external triggers, so the input and the output BNC connections.
You still have the digital ports and also the I/O connectors, with USB, LAN, LXI class-C
compliant, and GPIB. The additions we've made here are mostly on the left side of this
rear panel. So with the B mainframe, we've added four holes with rubber grommets to accommodate
external connections to our power modules. We've also added these auxiliary voltage measurement
ports to do voltage measurements that our N6781 SMU modules are capable of doing.
So now we've removed the cover of the N6705A mainframe. As you can see here, I have no
modules in here, but I do have the connections to the modules still here. So for each module,
you have two connectors: You have a smaller connector and you have a larger connector.
The smaller connectors are used for all of our modules that are rated for less than 12 amps.
For all of our modules greater than 12 amps, you have the larger connector that
you plug into the module. The N6705B mainframe is a bit different. This is the B mainframe
with the top cover removed. So in the A mainframe, for every output, you had a wiring harness
that had two output connectors attached to the harness. In the B mainframe, you still
have that single wire harness for each output; however, you don't have any connectors attached
to the harness. Instead, you have the four individual wires that would be plugged into
the connector. So these four wires are clearly labeled in this legend, right next to the
module output. And the wires would be attached to this Phoenix connector. So the wires represent
plus-and-minus output and plus-and-minus sense outputs. So instead of having two output connectors,
you would manually need to attach the wires to the connectors. I have an example of this
in output 1. So output 1 is already connected to the Phoenix connector, which would then
be connected to the power module. And the power module slips in right here.
In addition to the actual output connectors, we also have an RFI strip here, located at the bottom of
the modules, to create a better connection with the power modules. And finally, the third
change we've made in the B mainframe is this auxiliary voltage connector. This connector
is used in the N6781A modules, the SMU modules. This allows voltage measurements. So this
connector allows you to connect to the voltage measurement that is on the back of this rear panel.
Those were some of the big differences between the B mainframe and the A mainframe
of the DC Power Analyzer. The B mainframe does replace the A mainframe; however, if
you have the N6705A mainframe, there are upgrade kits available to upgrade to the B mainframe.
However, if you want to keep the A mainframe, the A mainframe still works with the N6780 modules.
Some of the key specifications, like program accuracy and transient response, are degraded.
Some customers have chosen to use the N6753A module with the N6705A mainframe,
and you're able to do this if you circumvent the front-panel binding posts. The front-panel
binding posts in both the A and the B mainframe are 20 amps, while the N6753A module is 50 amps.
So some customers choose to remove the top cover and operate the N6753A module without
the front binding posts. All of these specifications that I've talked about today is available on Agilent.com.