720A Operation and Maintenance Manual – Rev S – January 25, 2019
Page 23
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securely into the socket connecting it to the main
board. Connection via this socket can shift/dislodge
during shipment if the unit is handled roughly, or if the
end user drops the unit.
G.
Check that IC1, IC2, and IC9 are all still securely
plugged into their corresponding sockets on the
board. If any of these integrated circuits (ICs) have
become dislodged, the meter will not function
properly. These ICs may be pushed securely back
into their socket(s) by hand if the user is wearing an
ESD bracelet or equivalent static discharge
instrument.
H.
If you have completed the steps above and your 720A
meter will still not turn on/operate properly, please
contact AMPTEC for assistance.
Problem:
My 720A’s readings are inaccurate or not within the
accuracy specifications listed in section B.
Possible Solutions:
A.
Check the specifications listed within section B with
regards to the appropriate storage and usage
temperatures for your unit. Any deviations from these
temperature specifications will require the end user to,
at a minimum, apply the necessary temperature
coefficients to the unit’s readings and allow longer
warm up times for the product.
B.
Ensure that you are allowing enough time for the unit
to adjust to ambient temperature before taking
readings. Under normal circumstances, the unit
should be given a fifteen (15) minute warm up period,
and under extreme temperatures the unit should be
given at least a thirty (30) minute warm up period.
C.
The unit may need to be recalibrated. If dropped or
handled roughly, a 720A meter may need to be
recalibrated on a shorter than annual basis. To
recalibrate your 720A meter, please see section E-4.
D.
If you have completed the steps above and your 720A
meter is still providing inaccurate readings, please
contact AMPTEC for assistance.
E-3.1 Battery Replacement
Battery replacement of your 720A meter is strongly discouraged and should only be
completed by qualified and authorized individuals. It is recommended that in the event
of battery failure the unit is sent back to AMPTEC, where we can safely replace the
batteries for you (for more information on how to send your product in for this service,
see section E-2).
