Finest 500 - Page 9

• For resistance above 1 Megohm, the display might take a few
seconds to stabilize. This is normal for high-resistance readings.
• The Meter has a circuit to protect the resistance range from over-
voltage (600V AC). However, to prevent accidentally exceeding the
protection circuit’s rating and to ensure a correct measurement,
NEVER CONNECT THE TEST LEADS TO A SOURCE OF
VOLTAGE when the rotary switch is set to Ω or functions.
• The current applied during resistance measurements could damage
some devices. The table below lists the test voltage and current
available for each resistance measurement range. (All values are
typical.)
NOTE: (A) is the open circuit test voltage at the input terminals in
volts.
(B) is the voltage drop across a resistance equal to full
scale value.
(C) is the current through a short circuit at the input
terminals.
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4.2.1 Measuring Ohms
When measuring resistance, be sure that the contact between the test
leads and the circuit under test is good. Dirt, oil, solder flux, or other
foreign matter seriously affect the reading value.
Follow these step to measure ohms.
1. Set the Function switch to the desired “Ω” position.
2. Insert the black test lead into the “COM” input terminal and the red
test lead into the “VΩ” input terminal.
3. Connect the test leads to the circuit to be measured.
4. The measured resistance will be on the LCD.
4.2.2. Continuity Test
This mode helps you check electrical circuits, such as wiring, speaker
cables, connections, switchers, or relays for short or open circuits. In
continuity test, a measured value of approx. 150Ω or less causes the
Meter to emit a continuous tone.
Follow these steps to check continuity
1. Set the Function switch to the “ ” position.
2. Insert the black test lead into the “COM” input terminal and the red
test lead into the “VΩ” input terminal.
3. Connect the test leads to the circuit to be measured.
4. This Meter will emit a continuous tone for resistances of less than
150 ohms.
RANGE OPEN CIRCUIT FULL SCALE SHORT CIRCUIT
VOLTAGE (A) VOLTAGE (B) CURRENT (C)
200 Ω < 150 mV < 695 µA
2 KΩ < 550 mV < 470 µA
20 KΩ < 1.2 V < 700 mV < 95 µA
200 KΩ < 750 mV < 10.5 µA
2 MΩ < 800 mV < 1.1 µA
20 MΩ < 800 mV < 0.2 µA