Hey everybody!
I'm currently working on E4419B Power Meter and I occasionly have an error code pop up of "Running on battery power". Other than that it works fine and you can clear the code. The manual has no information on this.
Has anyone had this happen? :? Any ideas on what the cause is?
Thanks!
-G
Is it possible that your power cord is loose? If so, it could be wiggling just enough to remove power causing the backup battery to kick on.
The Service Manual says this:
Regulated DC voltages at +12 V, -12 V and +5 V are converted by the A1 power
supply assembly when AC power is connected to the rear panel or the optional
rechargeable battery is fitted. The DC voltages are connected and distributed to the
rest of the system by circuits on the processor assembly. When the key on the
front panel is pressed a bistable latch changes state. This, in turn, applies the correct
gate voltages to turn on three MOSFET switches, which connects the power supply
unit voltages to the distributed power buses.
The bistable latch is connected to a permanent power-supply which has the backup of battery power when AC mains is removed from the power meter. The +12 V supply is used to power the fan. This is filtered to decouple it from the rest of the system. When the optional rechargeable battery is fitted and the meter is in standby and connected to the ac power supply, the rechargeable battery will recharge and the fan will be powered on.