AEMC 8500 - Power Supply

Digital Transformer Ratiometer DTR
®
Model 8500 17
CT Test Mode Ready
Indicates system ready for CT testing
X Circuit: OPEN (or CONT)
Refer to the VT/PT Continuity Test section
H Circuit: OPEN (or CONT)
Refer to the VT/PT Continuity Test section
Low X Signal
CheckXcablesforinadvertentshortcircuits.
Xwindingmaybeshortedortransformercircuitbreakermaybeopen.
Low H Signal
Check H cables for inadvertent short circuits.
Check H cable connector at DTR
®
front panel.
4.6 Power Supply
The DTR
®
Model 8500 may be used for up to 10 hours on fully charged
NiCd batteries. The DTR
®
may also be line supplied during measurements.
In this mode the DTR
®
also recharges the NiCd batteries.
LOW BATTERY is displayed when the internal batteries approach low
voltage. When displayed, a limited number of measurements may still
be conducted, though we recommend recharging the DTR
®
as soon as
possible. If the battery voltage drops too low, the DTR
®
will lock out further
operation. In the lock-out mode, the DTR
®
shuts down all functions until
AC power is applied and the battery recharged.
We recommend recharging the DTR
®
overnight. Each time the DTR
®
is
connected to AC power, a 14-hour recharge cycle begins. Repeat charging
of partially discharged batteries will not result in battery damage. During
the 14-hr cycle, the CHARGING indicator will glow continuously; following
this period, a pulse-trickle charge mode is entered and the indicator will
pulse on and off.