Micronta 22-204A range doubler multimeter instructions, manual, circ...
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02/05/2010 16:45
If the pointer does not normally rest exactly over "0" at the left side of the scale, adjust the plastic screw in
the lower center of the meter face to bring the needle to "0".
Always observe correct test lead polarity when making DC measurements : Black into (COM and Red
into the +V.
Ω
.A (or 1000VDC or 10A) jacks.
Exercise extreme caution when measuring voltages of 50 and above.
When not in use, always leave the Range switch in the "OFF" position.
Use the Range Doubler switch as follows
For Resistance readings, always use the V-
Ω
-A position When using the V.A/2 position for all other
functions, divide the Range switch setting by 2 and read on an appropriate scale. For example : Range set
to 250 AC V and V.A/2 — the range is 125 volts (250 divided by 2) and you should read the red scale,
following the 0 to 125 markings. Another example : leads in COM and 10A with Range set to 10A and
V.A/2— the range is 5 amperes (10 divided by 2) and you should read the black scale, following the 0 to
50 markings.
DC VOLTAGE MEASUREMENTS
1. Plug the test leads into the correct jacks (Black into COM and Red into +V-
Ω
-A). 2. Set Range switch
to one of the DC V positions; it is best to start at the top and work down.
3. Connect the test probe tips to the circuit under test; be sure to observe correct polarity. Set Range and
Range Doubler switches as required to obtain a meter reading in the upper 1/2 or 1/3rd of the scale.
4. Read the voltage on the black DC scales. If the Range Doubler switch is in the V.A/2 position, be sure
to divide the Range switch setting by 2 and read on the appropriate scale.
5. For voltages between 250 and 1000, set Range switch to 250 and 1000 and plug the red test lead into
the 1000 Volt DC Only jack. For voltages between 250 and 500, set the Range Doubler switch to (V.A/2)
(full scale is then 500 volts). For voltages between 500 and 1000, set the Range Doubler switch to V.
Ω
.A
(the range is then 1000 volts).
NOTE : The 1000 Volt DC Only jack is for use only with DC voltages of 250 to 1000
USE EXTREME CARE WHEN USING THESE HIGH-VOLTAGE RANGES.
AC VOLTAGE MEASUREMENTS
1. Plug the test leads into the correct jacks (black into COM and red into +V.
Ω
.A).
2. Set Range switch to one of the AC V positions; it is best to start at the top and work down.
3. Connect the test probe tips to the circuit under test. Set Range and Range Doubler switches as required
to obtain a meter reading in the upper 1/2 or 1 /3rd of the scale.
4. Read the voltage on the red AC scale, following black numbers printed below the red scale. If the
Range Doubler switch is in the V.A/2 position, be sure to divide the Range switch setting by 2 and read
the appropriate scale.
RESISTANCE MEASUREMENTS
Before taking any resistance measurements, disconnect power to the unit under test and discharge
capacitors.
It is best to remove batteries and unplug line cords.
1. Plug the test leads into the COM and +V.ohms.A jacks.
