East Tester ET3260 User Manual page 3

Note: What showed in the above figure is front panel terminal, and rear panel terminal is
basically the same as the front panel terminal but without 12A-current shift, with
current-protection fuse on the rear panel.
Protection limits of input terminal are as follows:
Main input (HI and LO) terminals.
HI and LO input terminals are used in voltage, resistance, capacitance, continuity, frequency and
diode test, and the protection limits of the two terminals are as follows:
1) Protection limit from HI to LO. Protection limit from HI to LO is 1000 VDC or 750 VAC,
which is the maximum measurable voltage. The limit can also be expressed as 1000Vpk at most.
2) Protection limit from LO to grounding. Relative to grounding LO input terminal can safely
"float" to 500Vpk at most.
Protection limit of sense terminals
HI and LO sense terminals are only used in 4-wire resistance and ratio measurement. Protection
limit for all the terminal pairs is 200Vpk, and all the terminal pairs refer to LO SENSE to LO
INPUT, HI SENCE to LO INPUT, and HI SENSE to LO SENSE.
Current input (12A and 100mA) terminals.
12A terminal and LO terminal are used in current measurement of 1A and 12A measurement
ranges, and fuses inside the multimeter provide 15A protection limit at most to the current
through 12A terminal. 400mA terminal and LO terminal are used in current measurement of
measurement range from 10uA to 100mA, and current input fuses on the rear panel provide
500mA protection limit at most to the current through 500mA terminal.
Note:
In order to avoid fuse blowout and multimeter damage, please use current input terminals as
indicated as follows.
1) 12A and 100mA input terminals are not allowed to be connected to the current measurement
loops at the same time.
2) If the valid values of currents to be measured AC+DC are from 100mA to 12A, and only 12A
and LO terminals are allowed to be used in measurement.
3) When measuring current, please correctly select the current input terminals according to the
predicted current size before connecting multimeter power.
4) Current input to 12A terminal can not exceed 15A at most, otherwise fuses inside multimeter
will be blown out; current input to 100mA terminal can not exceed 500mA at most, otherwise
current input fuses on rear panel will be blown out.
 IEC measurement category II overvoltage protection.
In order to avoid electric shock, the product provides overvoltage protection in connection of the
mains which meet the following two conditions at the same time;
1. HI and LO input terminals are connected to mains under the measurement category II
conditions (as described in the following).
2. The maximum line voltage of mains is 300VAC.
Warning: IEC measurement category II includes electric devices connected to mains through an
outlet on branch circuit. Such devices include most small appliances, test equipment, and other
devices that plug into branch outlets.
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