Technical data

144 Agilent U1251B/U1252B User’s and Service Guide
7 Specifications
U1251B AC Specifications
Ta bl e 7 - 2 U1251B AC Accuracy ± (% of reading + No. of Least Significant Digit)
[1] Input impedance: Refer to Ta b l e 7 - 6 .
[2] AC mV/V and AC µA/mA/A specifications are true RMS AC coupled, valid
from 5% to 100% of range. The crest factor may be up to 3 at full scale, up to 5 at
half-scale, except for 1000 mV and 1000 V ranges, where the crest factor is 1.5
at full scale and 3 at half scale.
[3] The input signal is lower than the product of 20,000,000 V-Hz (product of
voltage and frequency).
[4] Input current >35 μArms.
[5] Current can be measured from 2.5 A up to 10 A continuously. Add 0.5% to
the specified accuracy if the signal measured is in the range of 10 A to 20 A and
for a period of up to 30 seconds. After measuring current >10 A, leave the meter
to cool down for a period that is twice the measuring time used before
application of low current measurement.
[6] Input current < 3 Arms.
Function Range Resolution
Frequency
30 Hz to 45 Hz 45 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 30 kHz
Tru e RM S
AC Voltage
[1][2]
50.000 mV 0.001 mV 1+60 0.6+40 1.0+40 1.6+60
500.00 mV 0.01 mV 1+60 0.6+25 1.0+40 1.6+60
1000.0 mV 0.1 mV 1+60 0.6+25 1.0+25 1.6+40
5.0000 V 0.0001 V 1+60 0.6+25 1.0+25 1.6+40
50.000 V 0.001 V 1+60 0.6+25 1.0+25 1.6+40
500.00 V 0.01 V 1+60 0.6+25 1.0+25
1.6+40
[3]
1000.0 V 0.1 V 1+60 0.6+40 1.0+40 N/A
Function Range Resolution
Frequency
30 Hz to 45 Hz 45 Hz to 2 kHz 2 kHz to 20 kHz
Tru e RM S
AC Current
[2]
500.00 μA
[4]
0.01 μA 1.5+50 0.8+20 3+80
5000.0 μA0.1 μA 1.5+40 0.8+20 3+60
50.000 mA 0.001 mA 1.5+40 0.8+20 3+60
440.00 mA 0.01 mA 1.5+40 0.8+20 3+60
5.0000 A 0.0001 A
2+40
[6]
0.8+20 3+60
<3 A/5 kHz
10.000 A
[5]
0.001 A
2+40
[6]
0.8+20