VOLTAGE AND CURRENT MEASUREMENT
1》 Liquid Crystal Display
》 Digital Display
The digital display shows the measurement value, decimal point and sign. When measuring DC quantities minus sign appears in front of the digits, if the positive pole of the measurement magnitude is applied to the “~” input. “OL appears if the measuring range upper limit is exceeded. The digital display is updated thrice per second for V,A,W, Capacitance, Frequency & Duty cycle measurements.
The following steps are acknowledged by an sound signal:
》New measurement function selection.
》Activation or deactivation of the following functions AUTO/MAN, REL or HOLD.
》When measuring current, AC/DC mA>400.0 mA, AC/DCA > 10 A, the buzzer will keep sounding as the overload warning.
3》 Measurement Value Storage “HOLD”
By pressing the HOLD/ON key, the currently displayed measurement value can be “held”, and “HOLD” is simultaneously displayed on the LCD. The Hold display is switched OFF if:
》 the Hold key is reactivated
》 the function selector switch is operated
》the yellow multi function key is activated for a change of function, Ac/Dc
》 RELkey is activated.
》 AUTO/MAN key is activated.
4》 REL-Relative value measurement
All functions can be used for Relative value Measurement except Hz/ duty, diode & continuity function.
5》 Voltage Measurement
By pressing the HOLD/ON key, the current.
“Connect the measurement cable as shown. Terminal “I.” should be grounded, and the second measuring cable with a higher potential connected to Terminal “V” “
If the fuse tripping limit values are exceeded due to operator error, both the operator and the instrument are in danger! Observe the volt-are limit values as printed on the meter!
》 Select the respective voltage type which corresponds to the measuring value by briefly pressing the yellow multi-function key. After selection of this function with the selector switch is of the voltage type DC is always activated.
HIGH FREQUENCY CAPACITOR
6》 Current Measurement
First switch off the power supply to the measuring circuit and/or to the load, and discharge any capacitors which might be present.
A》 Select function A with the function selector switch for currents > 400 mA, or function mA for currents < 400mA.
B》 Each time the key is pressed, alternate switching takes place between AC and DC, and change over is acknowledge by sound signal. The symbols – -DC and ~ AC indicate the selected current type in the LCD display.
Notes on Current Measurement:
》 The meter must be used only in power systems, when the current circuit is protected with a 20 A fuse or circuit breaker, and the nominal voltage of the system does not exceed 600V.
》 Current ranges up to 400 mA are protected with a FF1.6 A/ 600 V fuse. [The breaking capacity of the fuse is equal 50kA at nominal voltage of 600V with resistive load-CAT III].
》 In the 400 mA measuring range an intermittent sound signal ng ny wans you, if the measurement values has exceeded the measuring range upper limit value.
》 The 10 A current measuring range is protected with a 16 A/ 600 V fuse. [The breaking capacity of the fuse is equal to 50 KAat nominal voltage of 600V with resistive load-CAT III]
》 Fuse replacement is described.
7》 AC Measurement with (Clip-On) Current Transformers
A》Transformer Output mA/A
Due to defective or disconnected leads, a blown fuse in the meter or a wrong connection, dangerously high voltages can occur at the connections. For this reason, verify that the current circuit of the multi meter and secondary winding of transformer connected to the multi meter form an intact circuit. Connect the transformer to the sockets L and mA or A
Some currents transformers include safety devices, which pre vent dangerous voltage increases at open electrical circuits. The maximum allowable operating voltage at the primary conductor is equal to the nominal voltage of the current transformer. When reading the measurement value, consider the transformation ratio of the transformer, as well as additional display error.
B》 Transformer Output mVIA
Some transformers have a voltage output(designation: mV/A). Consequently, the secondary connection must be connected to L and V.