Menu Functions - Benning MM 12 Bedienungsanleitung

5.2.7 Press the CANCEL key 8 down/ ▼) to terminate a selected function.
5.2.8 Press the A-HOLD key 9 (up/ ▲) (automatic storage of measured values) to store
the displayed values on the secondary display 2 . The "Auto HOLD" symbol simulta-
neously appears on the display 1 . As soon as a new stable measured value with a
deviation of > 5 digits (resolution of 3¾ digits) is detected, the secondary display 2
will be updated automatically with the new value. Press the key again to switch the
device back to measuring mode.
The automatic storage of measured values can be deactivated in the setup menu.
5.2.9 Press the P-HOLD key 9 (down/ ▲) (peak value storage) to detect and store the
"Peak Max"/"Peak MIN" value (function: V, mV and A) with "PeakHOLD" being shown
on the display 1 at the same time. Each time a new "Peak MAX"/"Peak MIN" value is
stored, this is confirmed by an acoustic signal. The "Peak MAX" / "Peak MIN" value is
called via the P-HOLD key 9 (down/ ▼) and is shown on the secondary display 2 .
Pressing the P-HOLD key 9 (down/ ▼) for approx. 2 seconds switches the instrument
back to normal operating mode. The P-HOLD function has a response time of 10 µs.

5.3 Menu functions

Press the Cursor key 7 to select the functions shown on the LC display 1 . The selected
function is indicated by a flashing symbol. To start a function, press the ENTER key 8 (up/ ▲)
and the symbol will be shown with an underscore. To exit a function, press the CANCEL key
8 (down/ ▼).
5.3.1 "MAX", "MIN", "AVG" (average value) functions
Use the Cursor key 7 to select the "MAX", "MIN" or "AVG" function and start the
measurement by pressing the ENTER key 8 (up/ ▲). The function automatically
records and stores the highest measured value (MAX), the lowest measured value
(MIN) and the average value (AVG) of a series of measurements and shows the
respective value in the secondary display 2 . Pressing the CANCEL key 8 (down/
▼) switches the instrument back to normal operating mode.
5.3.2 Relative value function Δ
Use the Cursor key 7 to select the relative value function "Δ" and start the measure-
ment by pressing the ENTER key 8 (up/ ▲). The relative value function "Δ" stores
the currently displayed value on the secondary display 2 and shows the difference
(offset) between the stored measured value and the following measured values on the
display 1 .
Example:
Stored reference value: 235 V (secondary display 2 ), currently measured value:
230 V, this results in a difference (offset) of 5 V (main display 1 ). Pressing the
CANCEL key 8 (down/ ▼) switches the instrument back to normal operating mode.
5.3.3 Relative value function %
Use the Cursor key 7 to select the relative value function "%" and start the measure-
ment by pressing the ENTER key 8 (up/ ▲). The relative value function "%" stores
the currently displayed value on the secondary display 2 and shows the relative
percentage between the stored measured value and the following measured values
on the display 1 .
Relative value % = [(measured value - reference value) / reference value] x 100 %
Example:
Stored reference value: 235 V (secondary display 2 ), currently measured value:
230 V, this results in a relative percentage of -2.13 % V (main display 1 ). Pressing the
CANCEL key 8 (down/ ▼) switches the instrument back to normal operating mode.
5.3.4 Level measurement in dB/ dBm
The level measurement in decibels is the logarithmic ratio of two powers P1 to P2.
LP = 10 x log (P1/P2).
If the BENNINGF MM 12 is in the AC voltage (V AC) measuring mode, use the Cursor
key 7 to select the menu function "dB" or "dBm" and start the measurement by pres-
sing the ENTER key 8 (up/ ▲). The secondary display 2 shows the voltage level in
dB with a reference value of 1 V or the power level in dBm (reference value: 1 mW at
600 Ω). Voltage level and power level can be calculated as follows:
Voltage level in dB:
Performance level
in dBm:
Pressing the CANCEL key 8 (down/ ▼) switches the instrument back to normal
operating mode.
12/ 2018
Reference value: 1 V
Reference value:
1 mW an 600 Ω
BENNING MM 12
= 20 x log U
L [dB]
U
1 V
P
L = 10 x log [dBm] L
P
1 mW

U
2
= 10 x log [dBm]
600 Ω
P
1 mW
25