R/I-T1DX User Manual
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version 1.4
page 7
2.2.
Frequency and Amplitude of Current Injection Pulse
Frequency and amplitude of current injection are dependent on each other according to
dt
dU
C
I
C
where I
c
is the capacitive current, C is the capacitor in the amplifier headstage (3.3 pF) , dU/dt
is the change of the voltage amplitude of the triangle over time.
Example for frequency with fixed amplitude of the triangle (±10 V i.e. 20 V amplitude)
dt
dU
C
I
C
or
C
I
dU
C
dt
s
nA
V
F
dt
660
100
20
10
3
.
3
12
because of having a biphasic pulses this has to be multiplied by 2 to get the frequency
660 µs *2 = 1.32 ms
758 Hz
3. Technical Data
R/I-T1DX
Resistance measurement: 0.01…10 M
, display: XX.XX M
Current injection:
0…±280 nA, symmetrical around baseline; display: XXX nA
Output scaling:
1 V / M
or 1 V / 10 nA
Output: resistance:
50
, range ±10 V
