36 | Keysight | E4980A Precision LCR Meter 20 Hz to 2 MHz, E4980AL Precision LCR Meter 20 Hz to 300 kHz/500 kHz/1 MHz – Data Sheet
Relative measurement accuracy with bias current isolation
When DC bias Isolation is set to ON, add the following value to the open offset Yo.
√
Equationꢀ20.ꢀ
Yo_DCI1ꢀ×ꢀ(1ꢀ+ꢀ1/(Vs))ꢀ×ꢀ(1ꢀ+ꢀꢀ (500/Fm))ꢀ+ꢀYo_DCI2
Zm [Ω]
Impedance of DUT
Fm [Hz]
Vs [V]
Test frequency
Test signal voltage
Yo_DCI1,2 [S]
Idc [A]
Calculate this by using Table 61 and 62
DC bias isolation current
Table 66. Yo_DCI1 value
DC bias current range
Measurement time mode
SHORT
0 S
0.25 nS
2.5 nS
25 nS
250 nS
MED, LONG
0 S
0.05 nS
0.5 nS
5 nS
20 µA
200 µA
2 mA
20 mA
100 mA
50 nS
Table 67. Yo_DCI2 value
DC bias current
range
20 µA
Measurement time mode
≤ 100 Ω
0 S
300 Ω, 1 k Ω
0 S
3 k Ω, 10 k Ω
0 S
30 k Ω, 100 k Ω
0 S
200 µA
2 mA
20 mA
0 S
0 S
0 S
0 S
0 S
0 S
0 S
300 nS
0 S
0 S
30 nS
300 nS
0 S
3 nS
30 nS
300 nS
100 mA
DC bias settling time
When DC bias is set to ON, add the following value to the settling time:
Table 68. DC bias settling time
Bias
Settling time
1
2
Standard
Option 001
Capacitance of DUT × 100 × loge (2/1.8 m) + 3 m
Capacitance of DUT × 100 × loge (40/1.8 m) + 3 m
100 sec
10 sec
1 sec
100 msec
10 msec
2.
1.
1 mF
1 µF
10 µF
100 µF
10 mF
100 mF
DUT capacitance
Figure 12. DC bias settling time
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