Battery Saver; Relative Measurement Mode; True Rms Measurement; Measurement Functions - Ferve F-1880 Manual Del Usuario

2. To exit the manual ranging mode, press and hold down RANGE key for two
seconds. The Meter returns to the autorange mode and AUTO is displayed.

3.1.3 Battery Saver

The Meter enters the "sleep mode" and blanks the display if the Meter is on but
not used for 30 minutes. Press the * key or rotate the rotary switch to wake the
meter up. To disable the Sleep mode, hold down the SELECT key while turning
the meter on.

3.1.4 Relative measurement mode

The Meter will display relative measurement in all functions except frequency.
To enter and exit the relative measurement mode:
1. With the Meter in the desired function, touch the test leads to the circuit on
which you want future measurement to be based.
2. Press * key to store the measured value and activate the relative
measurement mode. The difference between the reference value and
subsequent reading is displayed.
3. Press * key for more than 2 seconds to return the Meter to normal operation.

3.1.5 TRUE RMS measurement

All the measurement values of the true RMS meter on the AC voltage and AC
current are true root-mean-square values. The basic meter can only measure
the AC average value.

3.2 Measurement Functions

3.2.1 AC and DC Volta e measurement
To avoid electrical shock and/or damage to the instrument, do not attempt
to take any voltage measurement that might exceeds 1000Vdc or 1000Vac
rms.
To avoid electrical shock and/or damage to the instrument, do not apply
more than 1000Vdc or 1000Vac rms between the common terminal and the
earth round.
The Meter's voltage ranges are 600.0mV, 6.000V, 60.00V, 600.0V and 1000V.
To measure ac or dc voltage (set up and connect the Meter as
shown in Figure 3-1 ):
1. Set rotary switch to the DCV, ACV or DCmV range.
2. Connect the black and red test leads to the COM and V terminals
respectively.
3. Connect the test leads to the circuit being measured
4. Read the displayed value. The polarity of red test lead connection will be
Indicated when making a DCV measurement.
NOTE:
Unstable display may occur especially at 600mV range,even though you do not
put test leads into input terminals.
For better accuracy when measuring the dc offset of an ac voltage, measure the
ac voltage first. Note the ac voltage range, then manually select a dc voltage
range equal to or higher than the ac range. This improves the accuracy of the
dc measurement by ensuring that the input protection circuits are
not activated.
DC Voltage
Figure 3-1 Measuring AC and DC Voltage