Axon Axopatch 200B, Theory Of Operation

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SPECIFICATIONS • 105
Chapter 9
Maximum Instrument Noise
Measured with minimal external noise sources ( i.e. , radiated line frequency noise,
mechanical vibration), 8-pole Bessel filter.
PATCH WHOLE CELL
β
= 1
β
= 0.1
Line freq.
Without holder: & harmonics 0.005 pAp-p 0.005 pAp-p 0.005 pAp-p
0.1-100 Hz 0.030 pAp-p 0.50 pAp-p 1.60 pAp-p
0.1-1 kHz 0.015 pA rms 0.25 pA rms 0.75 pA rms
0.1-5 kHz 0.060 pA rms 0.65 pA rms 1.65 pA rms
0.1-10 kHz 0.130 pA rms 1.10 pA rms 3.00 pA rms
With holder: 0.1-10 kHz 0.145 pA rms 1.10 pA rms 3.00 pA rms
2
2
10
-29
-30
10
10 Hz
100 Hz
FREQUENCY
1 kHz
700 G
Ω
CURRENT NOISE DENSITY
(A / Hz)
10
-31
-32
10
Figure 23A. Typical low frequency current noise spectrum, patch mode.