DC Current
Input
Protection
DM858: replaceable 10 A, 250 V fast-blow fuse on the front panel;
12 A, 1000 V fast-blow fuse internal
DM858E: replaceable 3.15 A, 250 V fast-blow fuse on the front
panel; 3.15 A, 1000 V fast-blow fuse internal
Short Circuit/Diode Test
Measurement
Method
Short circuit test: 100 μA ± 5% constant current source, <5 V open-
circuit voltage
Diode test: 350 μA ± 5% constant current source, <5 V open-circuit
voltage
Response Time DM858: 125 samples/s; DM858E: 80 samples/s, with beeper setting
Short Circuit
Resistance
Adjustable from 1 Ω to 1000 Ω
Input
Protection
1000 V
Setup Time Attentions
The setup time about voltage measurement is affected by source impedance,
dielectric characteristics of test cable, and input signal changes.
NOTE
[1]: 20% over range on all ranges except DCV 1000 V, ACV 750 V, DCI 10 A, 3 A, and ACI 10 A, 3
A.
[2]: 0.02 mV additional error per 1 V over the first ±500 VDC.
[3]: For 100 μA, 1 mA, 10 mA, and 100 mA ranges, the internal current sensing resistor needs
to be cooled when measuring >1 A current for more than 15 minutes.
[4]: 10 A is only available for DM858. The max. current range for DM858E is 3 A. For continuous
current greater than DC 7 A or AC RMS 7 A, 30 seconds ON and 30 seconds OFF.
[5]: Specifications are for 4-wire resistance measurement or 2-wire resistance measurement
using the "Relative" operation. ±0.2 Ω additional errors will be added in performing 2-wire
resistance measurement without using the "Relative" operation.
[6]: The accuracy specifications are for the voltage measured at the input terminals only. The
typical value of the test current is 350 μA. Variation in the current source will cause some
variation in the voltage drop across a diode junction.
AC Characteristics
Accuracy ± (% of reading + % of range)
Specifications
DM858 Series User Guide
128
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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