Mains Power Unit - Time Electronics 1010 User Manual

Time Electronics
1010 DC Voltage Calibrator
2.7

Mains Power Unit

2.7.1 Type PU2
The PU2 incorporates a rechargeable Nickel-metal hydride battery pack and charge
controller. The design is arranged to enable the PU2 to provide power directly from the
mains to power the instrument, and / or recharge the battery pack.
Alternatively, the PU2 can power the instrument from the rechargeable battery pack if mains
power is not connected.
When mains power is connected, the charger provides the correct charge current
(40-70mA) for the battery and automatically reduces this to a trickle rate (3 - 4mA) when
the battery is fully charged. This means that it is impossible to overcharge the battery.
The DC performance is as follows:
• With mains connected: DC output 15.5 - 7V (0 - 100mA load).
• With mains disconnected (and battery fully charged): DC 15.5 - 14.5V (0 - 100mA load)
• Mains input range: 110 - 250V AC 40 - 60 Hz. IEC mains input fuse is 20mm F1A.
The capacity of the rechargeable battery is approximately 600mAH. This allows about
40 - 50 hrs continuous use of the 1010. To fully recharge the battery requires 14-16 hours
with mains connected.
2.7.2 Constructional details PU2
The P.C.B. is located on the rear panel by 4 screws and is spaced off approx. 10mm. A
metal cover protects and screens the PCB and components. The output connectors and
output fuse are located outside the cover.
The cover is fixed to the rear panel by 4 screws. Later versions of PU2 have a 20mm
F500mA fuse located inside cover.
Important Note:
Take care when checking and dismantling a PU2. Even though disconnected from the mains, there is still
sufficient power stored in the rechargeable battery to cause catastrophic damage to the electronic circuitry if
inadvertent short circuits occur. These can easily occur when the metal cover is being removed.
1010 DC Voltage Calibrator
User Manual
v1.2
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