User`s guide

70 U2741A User’s Guide
4 Characteristics and Specifications
Frequency specifications
[1]
[1]
Frequency measurement can only be done in auto range mode. Specifications are for 30 minutes warm-up, using 1
second aperture. Measuring method is using reciprocal counting technique with AC coupled input at AC voltage
function. Gate time of 0.1second or 1second.
[2]
Only applicable for square wave measurement.
Ta bl e 4 - 6 Frequency accuracy
Functions Range Accuracy
(% of reading + % of
range)
Minimum Input
Frequency
Temperature
Coefficient (%)
Frequency 20 to 300 kHz 0.0200 +0.003 1 Hz 0.005
Ta bl e 4 - 7 Frequency sensitivity for AC voltage
Functions Input range Minimum sensitivity (RMS sine wave)
Frequency (Hz)
20 ~ 100 k 100 ~ 300 k
AC Voltage 100 mV
[2]
20 mV 20 mV
1 V 100 mV 120 mV
10 V 1 V 1.2 V
100 V 10 V 20 V
250 V 100 V 120 V
User's Guide.book Page 70 Friday, August 8, 2008 9:11 AM