3-2-2. 1MHz NORMAL MEASUREMENTS
Range Cp/Cs
G
Rs (ESR)
1pF 1.25000pF 6,28319uS
999.999k0
2pF 2.50000pF
12.56644S 999.999k0
4pF
5.00000pF
25.13274S 99.9999k0
8pF
10.0000pF 50.26554S 99.9999kn
16pF 20.0000pF
100.531uS
99.9999kn
32pF
40.0000pF 201.062aS 9.99999kn
64pF
80.0000pF 402.124uS 9.99999kn
128pF 160.000pF
0.80425mS
9.99999kQ
256pF
320.000pF
1.60850mS 999.9990
512pF 640.000pF
3.21699mS
999.9990
1024pF 1.28000nF
6.43398mS 999.99952
The 4278A's 1 MHz normal measurement function has eleven measurement ranges -- 1pF,
2pF, 4pF, 8pF, 16pF, 32pF, 64pF, 128pF, 256pF, 512pF, and 1024pF. Table 3-2 lists the
maximum measurement values for each of the measurement parameters. The maximum
values for D and 0 are 9.99999 and 99999.9, respectively, and the display format of D and
is fixed for all ranges.
Tab le 3-2. 1MHz Normal Measurement Ranges
NOTE
Leading zeros preceding the one's digit are place holders and will not be dis-
played. Measurement results which are greater than the values listed in the pre-
ceding table may be displayed.
When the number of display digits is set to less than six digits (4 or 5) the remain-
ing digits will not be displayed.
The maximum length of test leads which can be used for 1 MHz measurements is
2.5m.
3-2-3. 1MHz HIGH ACCURACY MEASUREMENTS
The 4278A's measurement range in the 1 MHz High Accuracy measurement mode is deter-
mined differently than it is for the other measurement modes. You can set the measure-
ment range, up to 2048pF, from the front panel, and can measure capacitance within the
measurement range you set, -±30%. The measurement range is determined by the sum of
the capacitance value you enter and the open capacitance.
For example, if the open capacitance is 0.3pF and you enter 47pF as the range value, the
measurement range will be set to 47.3pF and you will be able to measure capacitance from
32.81pF to 61.19pF.
(100% - 30%) x 47.3pF - 0.3pF = 32.81pF
(100% + 30%) x 47.3pF 0.3pF = 61.19pF
3.2
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