25
in the bottom right of the sub-display ("small" display). In this
connection, note the following illustration.
2. The VC 670 measures the true rms of an AC input. This type of mea-
surement is always useful where non-sinusoidal, overloaded, mixed-
frequency or high frequency (switching power supply) signals are
concerned.
3. Selectable special functions
The following sub-functions, according to multimeter model, are sel-
ectable by means of the “ENTER MENU” button
#“
Æ
%” reference value measurements, “MIN/MAX” value capture,
“TIME”, “REC” record measured value, “RCLL” measured value recall,
“LMT” comparison function (VC 670 only) and “PH” peak value mea-
surement (VC 650 and VC 670 only). These sub-functions are descri-
bed in more detail in section 5.12.
5.7 Temperature measurement (VC 650 and VC 670 only)
The temperature measuring range of the digital multimeter extends
from -40°C to +1000° C. Temperature measurement is carried out
exclusively using a K-type thermocouple probe. It should be noted that
outside the temperature range +18°C to + 28°C (= range of guaranteed
measurement accuracy) only the thermocouple should be placed within
the temperature to be measured. Additionally, the temperature
AUTO
AC
A
A
Hz
0
+10
+20
24
tion) mode. Now press the „mA•TEMP•A“ button twice. The measu-
ring instrument switches to A AC current measurement, recognisable
through the symbol "AC" to the left and adjacent to the measured
value. For the measurement of DC currents up to 20 A max., press the
"AC/DC" button once.
b) Connect the black test lead to the "COM" measuring instrument
socket and the red test lead to the "20 A" socket.
c) The bar graph beneath the measured value is active during measure-
ment, being similar to an analogue indicator with a faster reaction
time. The bar graph operates as a trend indicator.
d) Connect the test leads in series with the object to be measured (see
following illustration).
The "RANGE" button (manual range selection) is without function
during A current measurement.
Attention!
When a "-" appears in front of the DC current measured value, the mea-
sured current is negative (or the test leads are reversed). Never measure
currents over 400 mA. Measure currents equal to or lower than 400 mA
only in circuits themselves protected by a 400 mA quick-blow fuse.
Never measure currents over 20 A. Measure only in circuits themselves
fused at 20 A and in which no powers greater than 4000 VA can occur.
Measurements of currents equal to 20 A may be of 30 s duration max.
and be carried out only at intervals of 15 minutes (shunt cooling phase).
Note!
1. During AC current measurement, indicated in addition to the mea-
sured value and the bar graph, the frequency of the AC current is also
A
~
Fuse
Current
source
Measuring
instrument
Load
