Yum Cha MF-110A Analog VOM Handheld Multimeter
In my lab I have a Yum Cha MF-110A Analog VOM Handheld Multimeter.
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Instructions for use
1. Purpose
This product adopts a new ultra-small structure, is inexpensive, has good quality, and is widely available. It is suitable for factories, mines, schools, homes, and electrical appliance maintenance. This meter is particularly suitable for measurement in electronics classes and amateur radio experiments in primary and secondary schools. It has good mechanical strength and electrical insulation properties.
2. Main technical performance
1. Quantity limit
DC current: 0-0.5-50-250(500)mA
DC voltage: 0-10-50-250-500(1000)V
AC voltage: 0-10-50-250-500(1000)V
Resistor R10X100XIK
Audio frequency: -20-+12DB
2. Accuracy:
3. Overall dimensions: 90X60X30 (mm),
4. Accessories: 1 pair of test rods
Things to note:
Before measuring, check whether the range selection knob is in the correct position.
If the current or voltage to be measured is unknown, set the range selection to the high limit and make measurements after the correct range is selected.
The maximum DC current limit is 250 (500) mA, and the maximum voltage limit is 500 (1000) V.
Measurement steps:
First check whether the pointer is on the zero graduation line. If not, use a screwdriver to turn the zero adjuster to adjust it.
1. Direct current (DCA)
(1) Insert the red plug of the test rod into the "+" terminal of the instrument and the black plug into the "-" terminal.
(2) Set the range selector to the highest level of the current range.
(3) Touch the probe of the test rod to the circuit under test and connect it in series with the circuit under test.
(4) Read the indicated value from the second scale (mAV) on the dial.
(5) If the reading on the scale is too small, you can lower it one level until you get the ideal reading.
2. DC and AC voltage (DCV, ACV)
(1) Set the range selector knob to the maximum voltage limit (DC or AC)
(2) Connect the probe of the test rod across the circuit to be tested (in parallel)
(3) Read the indicated value from the second scale, pay attention to the third scale of 10V (AC 10V
Dedicated) to read the indicated value
If the reading on the scale is too small, you can lower the value to obtain the most ideal indication.
3. Resistance (Ohms)
(1) Set the range selector knob to the corresponding position.
(2) Short-circuit the probes of the test rod and adjust the zero-ohm adjustment knob so that the pointer stops at the zero-ohm graduation line. If the pointer cannot be adjusted to the zero-ohm graduation line, the battery is exhausted and needs to be replaced. (3) When measuring, read the resistance value from the first scale line (ohms).
(4) Use the test rod probe to measure the resistance of the device under test. The test rod should be connected in series with the device under test. Note: If measuring the resistance of a circuit, the power supply of the circuit should be cut off and all capacitors should be short-circuited to discharge.
Weizheng Electronic Instrument Co., Ltd.