Users manual
ET3260 and ET3260A
6 1/2 Digit Multimeter
44
Error (bandwidth): Bandwidth error can be evaluated according to the following formula.
Bandwidth error=
(% of the reading)
C.F.
refers to signal crest factor
F
refers to fundamental frequency for pulse
BW
refers to -3db bandwidth of multimeter, and ET3260 and 3260A are 1MHz
Example:
In calculation of approximate measurement error input in pulse sequence, the crest factor is 3,
and fundamental frequency is 20 kHz.
Assume that multimeter’s ninety-day accuracy is ± (0.05% of the reading) + (0.03% of the
measurement range).
Error sum= (0.05% of the r 0.03% of the measurement range) + (15% of the reading) +
(1.4% of the reading) =1.6% of the r0.03% of the measurement range
5.2.3 ACV load error
When using AC voltage measurement function, multimeter input impedance is 1MΩ, with
resistance being connected to 100pF capacitance in paralleled way, and multimeter test leads also
will introduce some capacitance and load. During low-frequency input, it equates to 1MΩ
resistance, and during high-frequency input, it equates to 100pF capacitance. The following table
displays approximate values of multimeter input impedances under different frequencies
Input Frequency
Input Impedance
100Hz
1MΩ
1kHz
850kΩ
10kHz
160kΩ
100kHz
16kΩ
6. Indicators
Input protection: 1000V, all-in-one;
Over measurement range measuring ability: 20%
Function switching rate:
≥
25sps
(note)
;
Measurement range exchanging rate:
≥
50sps
(note)
;
Automatic-shift time:
≤
30ms
(note)
;
Maximum internal trigger rate:
≥
2000sps
(note)
;
Maximum external trigger rate to the memory:
≥
2000sps
(note)
;