2
E4981A
Capacitance Meter
The 4268A has three measurement speeds (short, medium, long) and the 4288A has two measure-
ment speeds (short and long), compared to the E4981A which has five measurement speeds (n = 1, 2,
4, 6 and 8). The measurement time is defined as the time from trigger to the end of measurement.
Measurement Time
Comparison
Table 1. E4981A measurement time
n 1 2 4 6 8
1 MHz 2.3 ms 3.3 ms 5.3 ms 7.3 ms 9.3 ms
1 kHz 3 ms 4 ms 6 ms 8 ms 10 ms
120 Hz 11 ms 19.3 ms 35.9 ms 52.5 ms 69.1 ms
1. Tolerance = ± 0.5 ms
Table 2. 4268A measurement time
4268A Short Medium Long
120 Hz/1 kHz 22.5 ms 40.5 ms 54 ms
1. Tolerance = ± 2.5 ms
Table 3. 4288A measurement time
4288A Short Long
1 kHz/1 MHz 6.5 ms 16.5 ms
1. Tolerance = ± 0.5 ms
The E4981A capacitance meter provides the best combination of accuracy,
measurement speed, and a wide range of ceramic capacitor measurements.
The E4981A replaces the 4268A 120 Hz/1 kHz and the 4288A 1 kHz/1 MHz
capacitance meters. The E4981A includes the same functionality, SCPI com-
mands, and user interface which makes migration quite easy. This document
provides all the information you need to migrate to the E4981A.