Good afternoon. This video is for the user to be able to convert a non-system 500 watt
Agilent power supply, Models 655X series. There's a retrofit kit that can be purchased
through Agilent which is the 6950LJ72 kit which consists of all the parts required to
retrofit your instrument from a non-system unit to a system unit. The only part that
you don't get with this is the nameplate which is on the front of the instrument.
Everything else comes with the product.
Very, very old instruments had an isolator board, as shown. If the isolator board is
in your instrument, then it is required to replace the keypad which is in the front panel
of the instrument because the whole idea of the isolator board is to isolate the user
from secondary circuits, and the key that's the problem is the enter key. And as you can
see, there's a little step in there, and if the enter key for some reason gets damaged
or broken or what have you, that step makes it so you cannot get the enter key out so
the user can't come in contact with the secondary circuits.
So, next step is to save time, I'm going to just replace the entire rear panel with the
GPIB board connected. But I must say, when you're going to replace your instrument and
have a new GPIB board and make it a system unit, you're going to reuse your rear panel,
you get the connector that holds the stability for the GPIB board, and all the hardware to
hold the GPIB board in place. As you can see, this is how the connector goes. In this case
it's riveted. In this case, it'll be screwed in place.
So to save time, I'm going to replace the boards. The GPIB board has been placed in
the rear panel using the required hardware as shown. The connector that gives stability
to the GPIB board has been installed, and the next step is to connect the cables.
One serial cable gets connected from the control board to J107 of the GPIB board. The other
serial cable from the front panel of the instrument gets connected to J108 of the GPIB board, and
the cable gets connected to P101 of the GPIB board.
In newer instruments, some of these cables won't be in the instrument. The kit, the 6950L kit
will come with all the cables required to do the retrofit, and once this change has
been made, and you've reinstalled the GPIB board, then it's recommended that you initialize
the instrument to be a systems unit instead of a non-systems unit. This change, GPIB board
change, does not affect the calibration constants in any way. The only thing that happens is
if a customer goes and reads over the BUS what the model is, and they don't change it,
it's still going to read back the 65XX series, so it's recommended that the model be changed,
and that information can be found in the manual. The nameplate should also be changed to reflect
the new systems model. So I hope this video helped.