Functional description
24 100,000 cts digital multimeters
2. Description of the “Keypad” keys (continued)
SPEC: directly displays the tolerance of the
measurement in progress; there is no need to
search for it and calculate it.
From the main measurement, the display:
- recalls the specifications (x% L ±n D)
according to the type of measurement,
the range selected and the frequency
(in AC and AC+DC)
- calculates the range in which the true value
lies, if the device is within its tolerance:
SMIN value minimum specification
SMAX value maximum specification
MEAS+: gives access to the secondary
measurements (see table in the Appendix).
Choice of secondary functions on display
units 2, 3, and 4 by selection using the
navigator, according to the main
measurement, and validation by OK.
A long press on MEAS… is used to exit from
this menu.
When a main measurement is chosen,
the last secondary functions selected
are reactivated.
Opposite, example of measurements
available in VAC+DC.
When dB measurements are activated, the
measured value is taken as voltage reference
(V ref). The calculation is the following:
20 log
10
(V measured/V ref).
The voltage reference (V ref) cannot be
modified.
The MATH function is displayed when its
parameters allow (see the MATH Function
menu).
For dBm measurements and resistive power
calculations, refer to the menu for the
adjustment of the associated reference
resistances (dBm REF, W REF) and the
calculation formulas.
The power calculation VxA (VA) requires a third
connection on the A input (connected to the
same circuit), in order to measure
simultaneously:
- the voltage (main display unit)
- the current (display unit 3), measurement
always made in AC+DC.
The link to the COM input must be short and
of large diameter, in order to limit the
voltage drop, which influences the Volt
measurement.
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