Making Voltage Measurements
Voltage measurements are made using the red V/Ω socket and the black COM socket having
selected the appropriate function and range as described above.
The meter will show a minus sign (on dc measurements) when the voltage applied to the red
socket is more negative than that applied to the black socket.
The maximum voltage that can be applied between V/Ω and COM is 1000V DC or 750V AC (Cat
I); damage to the instrument may result if this limit is exceeded.
WARNING! The maximum input voltage to ground must not exceed 1000V (Cat I) or 600V (Cat
II) dc or ac rms. Safety will be impaired if these ratings are exceeded, see Safety section at the
beginning of the manual.
Making Current Measurements
Having selected the appropriate current function, current measurements up to 120mA are made
using the white mA socket and the black COM socket; current measurements up to 10A are made
using the 10A and COM socket. The meter will show a minus sign (on dc measurements) when
the polarity of the current is out of the mA or 10A sockets.
Current measurements using the mA socket can be autoranged between 1.0000 mA and
100.00mA ranges; measurements up to 10A can be made using the 10A socket having manually
ranged to 10A with the Range Up key.
The 1mA and 100mA ranges, using the mA socket, are protected by a 500mA (F) HBC fuse and
the 10A range, using the 10A socket, is protected by a 10A (F) HBC fuse. Both fuses are fitted
inside the instrument and replacement is described in the Maintenance section later in the
manual.
Note: After measuring high current using the 10A input, thermal voltages are generated that may
create errors when making measurements on the most sensitive dc voltage, current or Ohms
ranges immediately afterwards. To ensure that the specified accuracy is maintained, allow 10
minutes for the thermal effects to fade before making sensitive measurements.
Making Resistance Measurements
Resistance measurements are made using the V/Ω and COM sockets. Residual test lead
resistance can be nulled out using the Ohms null facility as follows:
Connect the test leads together and press Shift, Null (Ω Null is the shifted function of Null). The
100Ω range is set automatically and the NULL annunciator flashes; the meter stores the reading
that it detects after 5 seconds provided that it is less than 1.00Ω (100 counts). A beep sounds
when the null is completed and the display should show zero Ohms and no NULL annunciator;
the meter returns to its previous range, or AUTO if autorange had been operational before Ohms
null was selected.
If the reading cannot be nulled, because the offset is too large, the reading will not change and
the buzzer will not sound.
The Ohms null is stored as a floating point value which is used on all ranges; it is not lost when
the function is changed or when the instrument is turned off. Ohms null can be cancelled by either
pressing the Ω and Cancel keys together, by selecting Ohms Null and not generating a sub 1.00Ω
reading within the next 5 seconds, or by holding the Cancel key down at power-up to restore the
system defaults.
Normal Null can be used together with Ohms Null.
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