Keithley 2100 User Manual page 80

Section 4: Front Panel Operations
Figure 4-20
Using the MX+B function from the front panel
DCI ACI
PREV
DCV AC V AC V
DISPLAY
DIGITS
FILTER
NEXT
EXTRIG HOLD
AUTO
SINGL E
OFF
TRIGGER
ON
POWER
TRIGGER
To use the MX+B function from a remote interface:
Use the following commands to enable and configure the MX+B function:
dB
Definition
The dB feature takes a DC or AC voltage measurement and displays it in decibel units that
correspond with a relative reference value. The calculation of dB is listed below:
NOTE
The dB measurement is applied to DC and AC voltage only. The relative value is adjustable (from
0dBm to 200dBm) and is stored in volatile memory.
Setting the relative reference value
You can either manually select a number for the relative reference, or let the multimeter take the
first reading (0dB):
To set the relative reference value from the front panel:
1. Press the CONFIG + SHIFT + NULL keys.
2. Use the PREV and NEXT keys to move through the digits and the up and down arrow keys
to increase or decrease the numbers to the desired value.
3. Press ENTER to set the value (refer to
4-26
FUNCTION
4
PERIOD
2 2 2 2
CONT
FREQ TEMP
LIMIT S MX+B dBm dB
%
RATIO NULL
MIN/MA X
MATH
STORE L OCA L SHIFT
RECA L L
MEMORY
CALCulate:FUNCtion MXB
CALCulate:STATe {OFF|ON}
CALCulate:STATe?
CALCulate:MXB:MMFactor {<value>|MINimum|MAXimum}
CALCulate:MXB:MMFactor? [MINimum|MAXimum]
CALCulate:MXB:MBFactor {<value>|MINimum|MAXimum}
CALCulate:MXB:MBFactor? [MINimum|MAXimum]
dB = (Input signal in dBm) - (relative value in dBm)
The Vin is the input signal and the Vref is the relative reference.
Return to
Model 2100 6 1/2-Digit Resolution Digital Multimeter User's Manual
SENSE
4 WIRE
200V
PEA K
SETUP
RANGE
PREV NEXT
INPUTS
LOCK
F
ESC
ENTER
A UTO
FRONT/REAR
MENU
CONFIG
dB = 20 x log(Vin / Vref)
or
Figure 4-21).
Section Topics
CAT 1000V
CAT 600V
INPUT
V
HI
SHIFT
RATIO
1000V
REF
PEA K
LO
PREV
3A 500V
RMS
PEA K
R
3A 250V
AMP S
2100-900-01 Rev. B / July 2007
CONFIG
%
NEXT
ENTER