HP 34401A, User Manual

Page: 64 / 236

Math Operations
There are five math operations available, only one of which can be
enabled at a time. Each math operation performs a mathematical
operation on each reading or stores data on a series of readings.
The selected math operation remains in effect until you disable it,
change functions, turn off the power, or perform a remote interface
reset. The math operations use one or more internal registers. You can
preset the values in some of the registers, while others hold the results
of the math operation.
The following table shows the math/measurement function combinations
allowed. Each “
X
” indicates an allowable combination. If you choose a
math operation that is not allowed with the present measurement
function, math is turned off. If you select a valid math operation and
then change to one that is invalid, a “Settings conflict” error is
generated from the remote interface.
From the front panel, you enable a math operation by pressing the
appropriate key. The exception is Limit Test which you enable using the
LIMIT TEST
command in the
MATH MENU
.
From the remote interface, the math operations and registers are
controlled using commands within the
CALCulate
command
subsystem. First, select the math operation you want to use ( the default
function is null ):
CALCulate:FUNCtion {NULL|DB|DBM|AVERage|LIMit}
Then, enable the selected math function by turning the math state on:
CALCulate:STATe ON
Null
Min-Max
dB
dBm
Limit
DC V
X
X
X
X
X
AC V
X
X
X
X
X
DC I
X
X
X
AC I
X
X
X
Ω
2W
X
X
X
Ω
4W
X
X
X
Freq
X
X
X
Per
X
X
X
Cont Diode Ratio
X
X
3
Chapter 3 Features and Functions
Math Operations
63