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Section 4: Front Panel Operations
NOTE
Setting the reference resistance
You can set the reference resistance either through the front panel or from a remote interface.
To set the reference resistance from the front panel:
1.
Press the CONFIG + SHIFT + MIN/MAX 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
Figure 4-23
Setting the reference resistance from the front panel
DCI
ACI
PREV
DCV
AC V
AC V
DISPLAY
FILTER
DIGITS
NEXT
EXTRIG
HOLD
AUTO
SINGL E
OFF
TRIGGER
ON
POWER
TRIGGER
Making a dBm measurement
To make a dBm measurement from the front panel:
1.
Select the measurement function by pressing one of the DCV or ACV keys (the dBm feature
is only available for the DCV and ACV functions).
2.
Enable the dBm operation by pressing SHIFT + MIN/MAX keys.
3.
After enabling the dBm operation, you can set or alter the dBm relative value as mentioned
above.
4.
Observe the displayed reading (refer to
NOTE
4-28
Vin is the input signal voltage; Zref is the reference resistance. Changing the reference
resistance will not affect the stored relative reference value. The Zref is adjustable, with a
range from 50
to 8000
is stored in volatile memory and will be cleared after the multimeter has been shut-off.
This feature is available for DCV and ACV only.
FUNCTION
4
PERIOD
2 2
2 2
PREV
FREQ
CONT
TEMP
LOCK
LIMIT S
MX+B
dBm
dB
%
RATIO
ESC
NULL
MIN/MA X
MATH
STORE
L OCA L
SHIFT
RECA L L
CONFIG
MEMORY
Press SHIFT + MIN/MAX again to disable this feature. The "MATH" annunciator on the
display indicates the state of a mathematical feature.
Return to
Model 2100 6 1/2-Digit Resolution Digital Multimeter User's Manual
2
dBm = 10 x log(V
/Z
in
ref
(the default value is 600 ). The user-selected reference value
Figure 4-23
CAT
1000V
CAT
600V
SENSE
4 WIRE
HI
RATIO
200V
REF
PEA K
LO
SETUP
RANGE
3A
NEXT
INPUTS
RMS
F
ENTER
A UTO
FRONT/REAR
MENU
Figure 4-24
Section Topics
)/1mW
for the location of the keys used).
INPUT
V
SHIFT
CONFIG
1000V
PREV
PEA K
500V
PEA K
R
ENTER
3A 250V
AMP S
for the location of the keys used).
2100-900-01 Rev. B / July 2007
MIN/MA X
NEXT
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