Leader Electronics Corp. LDC-824 - Page 10

measurements can be accomplished within a short time and longer numerical display
measurement results in a more accurate measurement.
When the measuring time is within 1s — 0.1s,
1ms — 0.1ms 1.0000ms — 0.1000ms
Table 4-6-1
When the measuring time is within 10s — 1s,
Dipl
10Hz — 100Hz 100ms — 10ms X100 100.000ms — 10.000ms
100Hz — 1kHz X1000 10.0000ms — 1.0000ms
Table 4-6-2
(2) | Measuring accuracy
The accuracy of period measurement can be expressed as follows:
Accuracy = +1 count + trigger error + time base accuracy . . . Equation 4-6-1.
‘ In the above equation, the most important factor is the trigger-error. Trigger-error occurs
with the overlapped signal noise and noise in the counter. During the measurement, when
the display fluctuating range is within +1, the error can be regarded as +1 count. If it is
over +1 count, it may be trigger-error or alteration of the input signal. As a checking
method, when the input sensitivity of counter or input voltage is set to higher values, if the
variable range becomes less, it can be judged as trigger error.
In order to reduce the effect of-input signal noise the trigger-error can be reduced by
: raising the input voltage or by rectifying the input-wave into rectangular wave-form
applying to LDC-824(S).
By