Technical data

148 U1401A User’s and Service Guide
8 Specifications
[1]
Always use the relative function to offset the thermal effect before measuring the signal. If this function is not used, the
accuracy will be 0.03% + 25. The thermal effect could be present in the following conditions:
• Constant current, constant voltage, or square wave output.
• Wrong operation — where the resistance, diode, or mV measurement function is used to measure high voltage signals
exceeding 250 V.
• After battery charging has completed.
• After measuring a current greater than 50 mA.
AC specifications
[1]
Input impedance: 1.1 MΩ in parallel with <100 pF (nominal) for the range of 5 V and above, and 1 GΩ (nominal) for the
50/500 mV range. Crest factor: ≤ 3.
Table 8 - 2 DC current specifications
Function Range Resolution Accuracy Burden voltage/shunt Overload protection
DC current 50 mA
[1]
1 μA 0.03% + 5 0.06 V (1 Ω) 250 V, 630 mA
Quick acting fuse
500 mA
[1]
10 μA0.6 V (1 Ω)
Table 8 - 3 AC mV/voltage specifications
Function Range Resolution
Accuracy
Overload protection45 Hz to 5 kHz 5 kHz to 20 kHz
AC mV/voltage
[1]
(True-rms: From 5%
to 100% of range)
50 mV 1 μV 0.7% + 40 1.5% + 40 250 Vrms
500 mV 10 μV 0.7% + 20 1.5% + 20
5 V 0.1 mV
50 V 1 mV
250 V 10 mV