In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?

Frequency of the vibrator should be stable

Frequency of the vibrator should be constant

Amplitude of the vibrator should be constant

Both frequency and amplitude of the vibrator should be constant and stable

In vibrating condenser amplifier type pH meter, to maintain good perfo

1.	In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?
A.	Frequency of the vibrator should be stable
B.	Frequency of the vibrator should be constant
C.	Amplitude of the vibrator should be constant
D.	Both frequency and amplitude of the vibrator should be constant and stable
Answer» E.