Mastech MS8238H, User Manual

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WARNING
Never measure open-circuit voltages exceeding 600V between
the input terminals and ground to prevent injury or damage to
the meter
07 08
4. Operating Instructions
WARNING
Do not measure voltages higher than 600V DC or ACrms to
prevent damage to the meter or personal injury
4.1 AC/DC voltage measurement
•
• Press “
FUNC ” to switch between AC and DC voltage.
• Connect the red test lead to the input jack and the black lead to the
COM jack.
• Connect the leads to the circuit under test and read the measurement
on the display. Observe polarity for DC measurements. In manual
mode, If “OL” is display it means the measurement has exceeded the
current range. Increase the selected range and measure again.
Set the rotary switch to the AC/DC voltage position.
4.2 AC/DC current measurementrent
• Turn off power to the circuit. Allow all capacitors to discharge.
• Set the rotary switch to the appropriate AC/DC current range.
• Press “
FUNC ” to switch between AC and DC current.
• Depending on the current to be measured, connect the red test lead to
either the input or 10A jack and the black lead to the COM jack.
• Break the circuit and connect the leads in series with the circuit (black
lead on the lower voltage side).
• Turn circuit power on and read the measurement on the display. If “OL”
is display, it means the measurement has exceeded the current range.
Move the rotary switch to a higher range.
3.3 Button Functions
FUNC button:
• Press “ FUNC ” to switch between AC/DC or between function in a
rotary switch position.
HOLD button:
•
• Press “ HOLD ” again to release the hold.
Press “ HOLD ” to keep the current reading on screen. “ H ” symbol will
appear on the display.
RAN button:
• Press “ RAN ” to switch to manual range.Each press of the button will
switch to the next highest range, until reaching the highest range
where it will switch to the lowest range.
• Hold “
RAN ” to return to auto range.
3.4 Auto Power Off Function
•
• To turn the meter back on, press “
FUNC ”.
After 15 minutes of non-use the meter will automatically turn itself off.
button:
• With the rotary switch in any position other than OFF, press to
enable the
Wireless
communication function of the meter. Open the
app (iOS or Android) on the mobile device to be used and search for
the multimeter and establish a connection. Once connected, the app
will mirror the display of the meter and show any measurement being
performed. Press again to disconnect the meter from the mobile
device.
• To deactivate the auto power off function, hold down “ FUNC ” when
turning on the meter. will no longer be displayed.