5½ Digit Multimeter Reference Manual Section 3:
2110-901-01 Rev. C/August 2013 3-57
Remote operation
Commands that use the <n> parameter can use the MINimum and MAXimum name parameters. MIN
selects the minimum value and MAX selects the maximum value.
Use the following commands to configure and control the dBm math function:
CALCulate:FUNCtion DBM Select the dBm math function
CALCulate:DBM:REFerence <n> Set reference resistance value
<n> = 50 to 8000 Set reference (in ohms)
CALCulate:STATe <b> Enable or disable math operations
<b> = 0 or OFF Disable math
= 1 or ON Enable math
dB
The instrument expresses dB in terms of the dBm function as follows:
dB = (input signal in dBm) – (relative value in dBm)
The dB relative value can be set from -200 to 200 dBm and can be set from the front panel or by
using remote programming.
The dB relative value is stored in volatile memory and defaults to 0 dBm when power to the
instrument is cycled.
This feature is available for DCV and ACV only.
Since dB is calculated in terms of the dBm function, the dBm REF RES value has an effect on the dB
result.
Front-panel operation
Perform the following steps to use the dBm function:
1. Select the DCV or ACV function.
2. Press the SHIFT and NULL (MATH) keys.
3. Use the ◄ and ► keys to display dB and press ENTER.
4. Use the ◄ and ► keys to display dB REL and press ENTER.
Note that if you select the RUN menu option instead, the dB function will enable using the present
relative value.
5. Use the ◄, ►, ▲, and ▼ keys to enter the reference resistance and press ENTER. The MATH
indicator turns on.
You can disable the math operation by pressing a different function key. You can also disable it from
the math menu as follows:
1. Press the SHIFT and NULL (MATH) keys.
2. Use the ◄ and ► keys to display OFF and press ENTER.
To Next Page
Loading...
Need help?
General
