All digital meters contain a battery to power the display so they use virtually no power from the circuit under test. This means that on their DC voltage ranges they have a very high resistance (usually called input impedance) of 1M 
or more, usually 10M , and they are very unlikely to affect the circuit under test.
Typical ranges for digital multimeters like the one illustrated:
(the values given are the maximum reading on each range)
or more, usually 10M , and they are very unlikely to affect the circuit under test. Typical ranges for digital multimeters like the one illustrated:
(the values given are the maximum reading on each range)
DC Voltage: 200mV, 2000mV, 20V, 200V, 600V.
AC Voltage: 200V, 600V.
DC Current: 200µA, 2000µA, 20mA, 200mA, 10A*.
*The 10A range is usually unfused and connected via a special socket.
AC Current: None. (You are unlikely to need to measure this).
Resistance: 200, 2000, 20k, 200k, 2000k, Diode Test
AC Voltage: 200V, 600V.
DC Current: 200µA, 2000µA, 20mA, 200mA, 10A*.
*The 10A range is usually unfused and connected via a special socket.
AC Current: None. (You are unlikely to need to measure this).
Resistance: 200
, 2000, 20k, 200k, 2000k, Diode Test Digital meters have a special diode test setting because their resistance ranges cannot be used to test diodes and other semiconductors
ليست هناك تعليقات:
إرسال تعليق