Philips PM6302 Instruction Manual page 11

2.1.3. Position
The instrument should be used in horizontal or in sloping position by hinging out the tilting bracket. Make
sure that the ventilation holes in bottom- and top plate are free,
Pay attention that the instrument is not positioned on objects which produce heat or radiate heat.
2.1.4, Connection to the mains
The instrument must only supplied with a.c. voltage.
On delivery the instrument is set to 230 V + 15%,
If a different mains voltage is required, proceed as follows:
— Plug off the mains connector
— Remove the bottom plate after loosening both screws at the rear
— Change the connections on the transformer in accordance with the diagram annexed (see Fig. 4)
— Close the bottom plate and remove the top plate
— Exchange the mains-voltage plate on the rear side in accordance with the mains voltage adjusted
— Close the instrument
2.1.5. Earthing
The instrument must be earthed in conformity with the local safety regulations. The supplied mains cable
contains a protective conductor which is connected to the earth contacts of the plug, The instrument must be
connected to a mains socket with earth contacts. The protective earthing of the instrument is only guaranteed i
when performed in this way. I
The cabinet socket (_L) at the rear should on no account be used to connect a protective conductor.
The circuit earth potential of the measuring bridge is connected to the protective conductor.
2.2. OPERATION
2.2.1, Swi
After the measuring bridge has been connected to the mains in accordance to 2.1.4., it may be switched on by
depressing mains switch POWER, The scale in the indicator should light up. This means that the instrument is
ready for use, The white spot inside the POWER switch indicates mechanically that the instrument is switched
on. i
ing on the instrument :
2.2.2. Measuring ohmic resistors
— Depress push-button ""R"
— Connect the sample to sockets "|-E'"
2.2.2.1. Searching the correct range in case of unknown resistance value
— Depress push-button "SEARCH"
— Switch-over the measuring-ranges
— The correct measuring range is found, when the indicator points to the "Wwv"'-field,
— Pointer deflection too large — select a lower measuring range
— Pointer deflection too small —> select a higher measuring range
Note: In the ranges 0.1 2-1 Q;7 2-10 Q and 10 Q.- 100 Q, the searching range is limited.
If the pointer in range 100 2 - 1 kQ. points above the marked field and, switching over, the deflection
in range 10 Q. - 100 Q.becomes higher or remains the same, the resistor must be measured in one of
the lower ranges.
2.2.2.2. Measuring the resistance value for a known measuring range
— With the vernier adjust the pointer deflection to a minimum
— Multiply the scale reading by the value selected with the range selector to obtain the exact resistor value.
2.2.3. Measuring capacitors
— Depress push-button "C"
— Connect the sample to sockets "I-E" (casing to socket E}