User Manual

GMC-I Messtechnik GmbH 19
Control Functions
Setting the Reference Value
Ð Plug the measurement cables into the instrument and measure
a reference value (max. 25,000 digits, or 5000 digits in 10 A
range)
Ð Briefly press the ZERO | ESC key.
The instrument acknowledges storage of the reference value
with an acoustic signal, and the “ZERO ΔREL” or the “ΔREL”
symbol appears at the LCD. The value measured at the mo-
ment the key is pressed serves as a reference value.
Ð The reference value can be cleared by once again pressing the
ZERO | ESC key.
Notes Regarding Relative Measurement
• Relative measurement effects the main display only.
• In the case of relative measurement, Ω, F or AC quantities may
also appear as negative values.
4.3 Display (LCD)
Measured Value, Unit of Measure, Type of Current, Polarity
The measured value with decimal and plus or minus sign appears
at the digital display. The selected unit of measure and current
type are displayed as well. A minus sign appears to the left of the
value during the measurement of zero-frequency quantities, if the
plus pole of the measured quantity is applied to the “⊥” input.
Overranging
“0L” (overload) is displayed as of 61,000 digits.
Exceptions: “OL” appears at the display as of 6100 digits for
measuring functions with a measuring range span of 6000 digits.