60
Figure 11.5
Δ
V/
Δ
t
Put on the « derivative » measurement mode.
Every period
Δ
t, the recorder divide the voltage variation by
Δ
t and get a value in Volt/second.
Δ
V
Select the measurement range of the input signal from +-500µV to +-500V. The range must be
larger than the input signal.
As example for a signal varying from -7V to +7V -10V
Δ
t
Select the measurement period from 200µs to 10min. It’s the time between 2 derivative calcu-
lations. Take a period compatible with the signal speed: a period too short give a derivative with
noise.
11.2.1 Example
Channel 1: triangle signal, -5V to + 5V, period 5s
Channel 2: use measurement type
Δ
V/
Δ
t with the same signal
Δ
V +-10V
Δ
t 50ms
Span 20V/s
The signal (Channel 1) is varying linearly at +4V/s and then at -4V/s
The derivative (Channel 2) give 4V/s and -4V/s
11.2.2 Type of measurement
∫ 𝑉 𝑑𝑡
∫ 𝑉 𝑑𝑡
: Put on the measurement type « integral »
If U is the voltage measurement, every period dt the recorder calculate U*dt and add this to the previous calculation: this
sum or integral is expressed in Vs (Volt*second). The integral is reset by the user and/or every start of measurement.
∫ 𝑽
Select the measurement range of the input signal from +-500µV to +-500V. The range must be
larger than the input signal.
dt
Calculation period from 200µs to 10min.
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