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4. Use the pH / mV selector to output any of the 5 simulated pH values.
The readout of the instrument under test should approximately
correspond to the simulated pH value selected on the
WP-Sim
.
Variations are possible due to the current temperature and calibration
settings of the instrument under test.
Please note that the simulated values are for 25
O
C.
5. Make a note of the reading obtained on the display.
6. Now switch the
WP-Sim
Function switch to
Impedance
.
The pH value on the instrument’s display should change by less than
0.05pH if it’s input impedance is high enough. If the display changes
by more than this amount, the instrument must be returned for repair.