154 Agilent U1251A/U1252A User’s and Service Guide
8 Specifications
AC specifications for U1252A
Table 7-4 U1252A accuracy specifications ± (% of reading + number of LSD) for true RMS AC voltage
Function Range Resolution
Frequency
20 Hz –
45 Hz
45 Hz –
1 kHz
1 kHz –
10 kHz
10 kHz –
20 kHz
20 kHz –
100 kHz
[1]
Voltage
[2]
50.000 mV 0.001 mV 1.5 + 60 0.4 + 40 0.7 + 40 0.75 + 40 3.5 + 120
500.00 mV 0.01 mV 1.5 + 60 0.4 + 25 0.4 + 25 0.75 + 40 3.5 +120
1000.0 mV 0.1 mV 1.5 + 60 0.4 + 25 0.4 + 25 0.75 + 40 3.5 + 120
5.0000 V 0.0001 V 1.5 + 60 0.4 + 25 0.4 + 25 0.75 + 40 3.5 + 120
50.000 V 0.001 V 1.5 + 60 0.4 + 25 0.4 + 25 0.75 + 40 3.5 + 120
500.00 V 0.01 V 1.5 + 60 0.4 + 25 0.4 + 25 1.5 + 40 3.5 + 120
[3]
1000.0 V 0.1 V 1.5 + 60 0.4 + 40 0.4 + 40 1.5 + 40
[3]
-
Notes for U1252A AC voltage specifications:
1 The additional error to be added as frequency > 20 kHz and signal input <10 %of range: 3 counts of LSD per kHz.
2 Input impedance: > 1GHz for 50 mV to 1000 mV. Input impedance is 1.1 MΩ (nominal) with <100 pF for 5 V to 1000 V
ranges.
3 The input signal is lower than the product of 20,000,000 V-Hz (product of voltage and frequency).
Table 7-5 U1252A accuracy specifications ± (% of reading + number of LSD) for true RMS AC current
Function Range Resolution
Frequency
20 Hz – 45 Hz 45 Hz – 1 kHz 1 kHz – 20 kHz
20 kHz –
100 kHz
[1]
Current
500.00 µA
[2]
0.01 µA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
5000.0 µA 0.1 µA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
50.000 mA 0.001 mA 1.0 + 20 0.7 + 20 0.75 + 20 5 + 80
440.00 mA 0.01 mA 1.0 + 20 0.7 + 20 1.5 + 20 5 + 80
5.0000 A 0.0001 A 1.5 + 20
[4]
0.7 + 20 3 + 60
< 3 A/5 kHz
-
10.000 A
[3]
0.001 A 1.5 + 20
[4]
0.7 + 20
Notes for U1252B AC current specifications:
1 The additional error to be added as frequency > 20 kHz and signal input< 10 % of range: 3 counts of LSD per kHz.
2 Input current > 35 µArms.
3 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.
4 Input current < 3 Arms.
