Technical data

Specifications 1
U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide 5
Frequency specifications
[1]
[1]
Frequency measurement can only be done in autorange 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 0.1 second or 1 second.
[2]
Only applicable for square wave measurement.
Table 1 - 5 Temperature coefficient for current
Range Frequency (Hz)
20 ~ 45 45 ~ 10k 10k ~ 30k
Te m p e r a t u r e
coefficient
10.0000 mA,
100.000 mA,
1.00000 A,
2.0000 A
0.02 + 0.02 0.02 + 0.02 0.02 + 0.02
Table 1 - 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
Table 1 - 7 Frequency sensitivity for AC voltage
Functions Input range Minimum sensitivity (RMS sinewave)
Frequency (Hz)
20 ~ 100k 100 ~ 300k
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