243
Theory of Operation
The Main Power Supply Assembly
Figure 46 To disconnect the instrument from line, unplug the power cord. The power supply
still uses some power, even if the power switch on the front panel is turned off.
No accessible hardware fuse is needed because the main power supply is
safe against any short circuits or overload conditions on the output lines.
When overload conditions occur, the power supply turns off all output
voltages. Turning the line power off and on again resets the power supply
to normal operation if the cause of the overload condition has been
removed.
An over-temperature sensor in the main power supply is used to turn off
output voltages if the temperature exceeds the acceptable limit (for
example, if the cooling fan of the instrument fails). To reset the main
power supply to normal operating conditions, turn the instrument off,
wait until it is approximately at ambient temperature and turn the
instrument on again.
The following table gives the specifications of the main power supply.
Table 61 Main Power Supply Specifications
Maximum
power
130 W Continuous output
Line Input 100 – 120 or 220 – 240 volts AC
±10%, line frequency of
50/60 Hz
Wide ranging
Output 1 + 24 V / 4.5 A (maximum) total power consumption of
+ 24 V and + 36 V must not
exceed 107 W.
Output 2 +36V / 2.5A (maximum)
Output 3 +5V / 3A
Output 4 +15V / 0.3A
Output 5 -15V / 0.3A
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