AMH-38™ AND AMH-100™ OPERATION AND MAINTENANCE MANUAL
2.4.3
VERIFYING PG7000 EMBEDDED SOFTWARE VERSION
FOR AMH SUPPORT
To use a PG7000 Platform with AMH, the PG7000 Platform embedded software must
support AMH. PG7000 embedded software versions 2.05 or higher support AMH. The
software version can be viewed by pressing and holding the PG7000
[ESCAPE]
key from the
main run screen.
If your PG7000 Platform is not running embedded software version 2.05 or higher, the
PG7000 embedded software must be upgraded before AMH can be used. For most
PG7000s, this can be accomplished by downloading a software flashing utility and the
embedded software from the
DHI
web site,
www.dhinstruments.com
.
PG7000 Platforms running an embedded software version lower than 2.02 require hardware
changes to upgrade to version 2.05. Contact a DHI Authorized Service Provider to have this
service performed. Do not attempt to flash new software until the necessary hardware
upgrade has been performed.
2.5
CHECKING THE PG7000 PISTON-CYLINDER MODULES
FOR AMH OPERATION
2.5.1
CHECKING THE PISTON CAP
The AMH mass handler lifts the mass loading bell completely off of the piston and lowers it
back down each time the mass load is changed. When adding AMH to an existing PG7000
system, it is important to check the outer circumference of the piston cap for displaced
material from dents or dings that might interfere with the free removal and replacement of the
bell. In this case, in particular, when the bell is lowered back onto the piston with little or no
additional mass, the weight of the bell alone may not cause it to seat properly on the piston
cap, which could cause poor performance.
Before using AMH with existing piston-cylinder modules, examine the outside circumference
of the piston cap (see Figure 4). Remove any material on the outside surface and return to a
finish of approximately 0.8 micrometers or better. Note that the piston mass is a calibrated
value so after removing material, the mass should be redetermined. Also, apply and wipe off
a very thin film of Krytox® lubricant on the inside surface of the top of the mass loading bell
where it contacts the outside perimeter of the piston cap (a tube of Krytox lubricant is
included in the PG7000 Platform accessories). If you are not comfortable performing this
task with in-house capabilities, contact an Authorized DHI Service Provider.
Test the piston-cylinder modules with the AMH mass set bell. To do this, install the piston-
cylinder module and binary mass carrier on the PG7000 Platform (see the PG7000 Operation
and Maintenance manual). Then slip the AMH mass bell down over the binary mass carrier.
The bell should seat smoothly and easily. If you push the bottom of the seated bell to one
side, it should naturally and easily fall back to its normal seated position (see Figure 5). If the
bell does not seat easily and/or does not reseat naturally when pushed to one side, there is
likely to be difficulty operating AMH with the piston. If this cannot be corrected locally, the
piston-cylinder module should be returned to a DHI Authorized Service Provider.
© 2007 DH Instruments, a Fluke Company
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