Dranetz DranTech Xtra, Руководство пользователя

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DranTech X
TRA
User’s Guide
19
Control Functions
4.1.3 Quick Measurements
Measurements performed using a suitable fixed measuring range are
executed more quickly than those which utilize automatic range selec-
tion. Quick measurement is made possible with the following two
functions:
• Manual measuring range selection , i.e. selection of the measur-
ing range with the best resolution (see chapter 4.1.2).
or
• With the DATA function (see chapter 4.4). In this way, the appro-
priate measuring range is selected automatically after the first
measurement and the second measurement is executed more
quickly.
The selected measuring range remains active for the subsequent series
of measurements with these two functions.
4.2 Zero Offset / Relative Measurements
Depending upon deviation from the zero point, zero balancing or a
reference value for relative measurements can be stored to memory:
The applicable reference or correction value is deducted individually
for the respective measuring function as an offset from all subsequent
measurements, and remains in memory until deleted, or until the mul-
timeter is switched off.
Zero balancing and reference value adjustment can be used for auto-
ranging, as well as for manual measuring range selection.
Zero Balancing
∞
Plug the measurement cables into the instrument and connect the
free ends to each other, except for capacitance measurement in
which case the ends of the cables are not connected to each other.
∞
Briefly press the ZERO | ESC key.
The instrument acknowledges zero balancing with an acoustic sig-
nal, and the “ZERO
Δ
REL” symbol appears at the LCD. The value
measured at the moment the key is pressed serves as a reference
value.
∞
Zero balancing can be cleared by once again pressing the ZERO |
ESC key.
Note!
As a result of TRMS measurement, the multimeter displays a
residual value of 1 to 30 digits with short-circuited measurement
cables as the zero point for V AC / I AC or V(AC+DC) / I
(AC+DC) measurements (non-linearity of the TRMS con-
verter). This has no influence on specified accuracy above 2% of
the measuring range (or 3% in the mV range).
Setting the Reference Value
∞
Plug the measuring cables into the instrument and measure a refer-
ence value (max. 5000 digits).
∞
Briefly press the ZERO | ESC key.
The instrument acknowledges storage of the reference value with
an acoustic signal, and the “ZERO
Δ
REL” or the “
Δ
REL” symbol
appears at the LCD. The value measured at the moment the key is
pressed serves as a reference value.
Deviation from zero
– With short-circuited measurement cables for V,
Ω
, A
– With open input for capacitance unit of measure F
Display
0 to 200 digits ZERO
Δ
REL
> 200 to 5000 digits
Δ
REL