3.5 Basic Operations
3-44 ZM2376
When the triggered drive is enabled, if the trigger delay time is set to zero, the measurement will be
incorrect. If the triggered drive is enabled, it will take time from output of the drive signal to
settlement of the signal. Also, the settling time is required when the frequency or signal level is
changed.
Approximate settling time in the measurement of large capacitance can be obtained from the
measurement frequency, DUT capacitance C (F), and output impedance Rd (Ω).
Measurement frequency 120Hz Settling time = 4ms + 6 × Rd × C
Measurement frequency 1kHz Settling time = 1ms + 6 × Rd × C
Setting example of trigger delay time (in both cases, Rd=100Ω)
Measurement frequency 120Hz, DUT 220µF Trigger delay time 142ms
(about 17 periods of signal)
Measurement frequency 1kHz, DUT 10µF Trigger delay time 7ms
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