Notes:
*
Your meter will show frequency values in the right secondary display and dB(m) in the left
secondary display depending on the input AC voltage source.
*
The value of dB(m) indicated a logarithmic ratio of input voltage to the standard value stored.
*
Input impedance: 10 MOhm in parallel with less than 100 pF.
*
Frequency response: 40 Hz to 20 kHz
*
The meters high input sensitivity produces a wandering effect, when the test leads are not
connected to any circuit. This is normal and an accurate reading will appear, when you connect
the test leads to a circuit to be measured.
7.3. Measuring DC/AC Currents
Warning !!
Never attempt to measure currents in circuits with voltages over 250 volts DC/AC. It may damage
the instrument and expose yourself to a severe shock hazard. A severe faire hazard and short circuit
danger exits if you apply a voltage with high current capability to this terminal. The 10 A-terminal is
fuse protected. Never measure currents exceeding 10 A. When using this range with high currents,
keep the duty cycle to 30 seconds on load and 15 minutes off load.
Follow these steps to measure AC/DC current:
1. Press FUNC-Switch
“SELECT" for AC or DC function.
2. Plug the black test lead into the COM-terminal and the red test lead into the µA/mA or 10 A-
terminal depending on the range your selected.
3. Connect the test leads in series with the load or circuits.
Notes:
*
If you do not know what the current is, connect the circuit to 10 A input-terminals first to see, if
you have safe level for the mA input terminal. Use A terminal for current up to 500 mA.
*
When measuring current, the meter´s internal shunt resistors develop a voltage across the
instrument´s terminals so called "burden voltage". This voltage is very low, but it may affect
precision circuits and measurements.
*
If you set the function DC current, the Symbol "-" appears or disappears to indicate the polarity of
the measured value.
-34-
Input Voltage
dB (m)
0,775 mV
-60 dB
109 mV
-17 dB
1,94 mV
8 dB
19,4 mV
28 dB
