Boonton 4240 RF Power Meter - Manual (Page 44)

Boonton 4240 Series RF Power Meter
he user may also perform a 0 dBm calibration by one key st T roke of the Zero/Cal key. Simply connect the sensor to a 0 dBm
rator to 0 terna ress the
m signal i n fact .00
he Zero/Cal menu is displayed by first pressing the <Menu> key followed by the <Zero/Cal> key. From there the user
he function (Z e ch ibration o e Zero/Cal menu invokes
ree commands as sho
C H 1 C H 2
source (either by setting the internal 50MHz calib dBm or connecting to an ex l 0 dBm source) and p
Zero/Cal> key. The instrument detects that a 0 dB s present and sets a calibratio or accordingly to indicate 0 <
dBm.
T
chooses t
ero, Fixed Cal, Auto Cal) and th annel to perform the cal n. Th
th wn in Figure 3-22.
Z
E R O <
F I X E D C A L
A U T O C A L
Figure 3-22. Zero and Calibration Display
ZERO – performs zeroing of all hardware ranges of the selected channel.
FIXED CAL – the internal 50MHz calibrator is set to 0 dBm and a calibration is performed at that point. Fixed Cal may
performed on any 0 dBm source other than the internal calibrator.
be
UTO CAL – improved sensor shaping can be realized by performing a step calibration using the 50 MHz Step Calibrator.
o perform an AutoCal, connect the sensor to be calibrated to the desired measurement channel and to the front panel CAL
UT connector. Press the <Menu> key followed by the <Zero/Cal> key. The Zero/Cal menu will be displayed. Navigate the
ursor to the AUTO CAL line and select the channel to have the auto cal performed on. Press the <Enter> key to being the
UTO CAL process. The instrument will return to the measurement window upon completion of the calibration.
.3.6 REL Level Key (single key press operation).
ften relative measurements are required especially when measuring system gains and losses. One key press of the
Ref/Level> key makes this job easier and faster to perform. Simply connect the active channel’s sensor to the input signal of
e system under test. Press the <Ref/Level> key and the reference level is set! Next connect the sensor to the system output
nd read the gain or loss directly from the reference level measurement.
he REF Level menu is displayed by first pressing the <Menu> key followed by the <REF Level> key. From there the user
ay SET (entering a value ) or LOAD (use the current channel measurement ) the reference level on either channel.
ress the <REF Level> key to enter a value or to use the current channel measurement for the reference level. The
easurement units will automatically change to dBr for logrythmic units or % for linear units for subsequent measurements.
n example of the instrument's display is shown in Figure 3-23.
R E F E R E N C E L E V E L
The built-in 50 MHz calibrator provides a convenient means for calibrating the instrument. Calibration can be performed any
time to assure accuracy.
A
T
O
c
A
3
O
<
th
a
T
m
P
m
A
C H 1 C H 2
d B > + 0 0 . 0 0 + 2 5 . 0 0
M O D E L O A D S E T
Figure 3-23. Zero and Calibration Display
Getting Started
3-20