45
B)
Internal Offset Circuit Test
Press the "pH7 TEST" key and the dis-
play should show a value between 7 pH
±1 pH. This will verify the internal circuit of
the meter in terms of the offset compen-
sation.
C)
Amplifier Circuit Test
Press the "pH4 TEST" key and the dis-
play should show a value between 3.30
pH and 4.30 pH. This will verify the ampli-
fier circuit of the meter.
pH
pH 7
TEST
pH 4
TEST
pH
