Acv Load Error; Indicators - East Tester ET1260 User Manual

Users manual
Error (bandwidth): Bandwidth error can be evaluated according to the following formula.
Bandwidth error=
C.F. refers to signal crest factor
F refers to fundamental frequency for pulse
BW refers to -3db bandwidth of multimeter, and ET1260B and 1260A 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 reading + 0.03% of the measurement range) + (15% of the reading) +
(1.4% of the reading) =1.6% of the reading +0.03% 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
100Hz
1kHz
10kHz
100kHz

6. Indicators

Input protection: 1000V, all-in-one;
Over measurement range measuring ability: 20%
Function switching rate: ≥25sps
Measurement range exchanging rate: ≥50sps
Automatic-shift time: ≤30ms
Maximum internal trigger rate: ≥2000sps
Maximum external trigger rate to the memory: ≥2000sps
ET1260B and ET1260A
(% of the reading)
(note) ;
(note)
(note) ;
(note) ;
6 1/2 Digit Multimeter
Input Impedance
1MΩ
850kΩ
160kΩ
16kΩ
;
(note) ;
44