Benning MM 11 Bedienungsanleitung Seite 26

5.1.12 The button
lowest measured value as well as the mean value in the subdisplay
. The following values are indicated by indexing: "MAX" indicates the
highest measured value stored, "MIN" indicates the lowest measured
value and "AVG" the mean value. Press the button for an extended
period of time (2 seconds) to switch back into normal mode.
5.1.13 The button
display value in the subdisplay  and indicates the difference (offset)
between the stored measured value and the following measured values
in the display .
Example:
Stored reference value: 235 V (subdisplay ), current measured value:
230 V, yields a difference (offset) of 5 V (main display ). A renewed
press of the button switches back into normal mode.
5.1.14 The range button
ranges whilst simultaneously fading out "AUTO" in the display. Press
the button for an extended period (2 seconds) to select the automatic
range selection (indication "AUTO"):
5.1.15 Level measurement in dB/ dBm: The level measurement in decibel is
the logarithmic ratio of two quantities such as e.g. voltage or current.
If the BENNING MM 11 is in the function mode for alternating voltage
measurement (V AC), press the
extended period of time (2 seconds) to activate the level measurement.
In the subdisplay  the voltage level is indicated in dB with a reference
value of 1 V. A renewed press of the Range button
indicates the performance level in dBm (reference value: 1 mW for
600 Ω). The voltage and performance levels are calculated as follows:
Voltage level
in dB:
Performance Reference value:
level in dBm: 1 mW an 600 Ω
By pressing the button
seconds) (dB/ dBm), there will be a switch back into normal mode.
5.1.16 The measuring rate of the BENNING MM 11 amounts nominally to
2 measurements (20,000 digit) respectively 4 measurements (4,000
digit) per second for the digital display and 20 measurements for the
bar graph display.
5.1.17 The BENNING MM 11 is switched  on and off with the rotary switch.
Shutdown position "OFF".
5.1.18 The BENNING MM 11 switches off automatically after approx. 30 min-
utes (APO, Auto-Power-Off). It switches back on again if a button or the
rotary switch is operated.
5.1.19 Temperature coefficient of the measured value: 0.1 x (stated measuring
precision)/ °C < 18 °C or > 28 °C, related to the value for the reference
temperature of 23° C.
5.1.20 The BENNING MM 11 is supplied by a fitted 9 V block battery (IEC 6 LR 61).
5.1.21 If the battery voltage drops below the specified operating voltage
(approx. 7 V) of the BENNING MM 11, then an empty battery symbol
( ) appears on the display.
5.1.22 The life span of a battery amounts to approx. 100 hours (alkali bat-
tery).
5.1.23 Appliance dimensions:
(L x W x H) = 200 x 90 x 42 mm without rubber protection frame
(L x W x H) = 212 x 100 x 55 mm with rubber protection frame
Appliance weight:
400 g without rubber protection frame
600 g with rubber protection frame
5.1.24 The safety measuring leads supplied are expressly suited for the rated
voltage and the rated current of the BENNING MM 11.
5.1.25 The BENNING MM 11 is protected by a rubber protection frame 
against mechanical damage. The rubber protection frame  allows the
BENNING MM 11 to be set up or hung up during the measurements.
5.1.26 The BENNING MM 11 features at its head an optical interface S . This
is used for the galvanic separation of the measuring signal to a PC/ lap-
top. The enclosed data cable is used for the transmission of measuring
data and is equipped with a USB 2.0 compatible connection.
03/ 2011
 inputs and stores automatically the highest and
 (relative value - function) stores the current
Reference = 20 x log U
L
U
value: 1 V
L = 10 x log
P
BENNING MM 11
 is used to index the manual measuring
button  (dB/ dBm) for an
[dB]
1 V
P
[dBm]
1 mW
 for an extended period of time (2
 (dB/ dBm)
U²
= 10 x log 600 Ω [dBm]
L
P
1 mW

20