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BYTE 8 shows the remaining front panel modes and functions, with the True bits (—1) indicating ON,
and the False bits (=0) indicating OFF.
Bits
Mode or Function
0
not used (always = 0)
1
not used (always = 0)
2
not used (always = 1)
3
PULSE
4
not used
5
AM
6
PEAK
7
Penlift enabled ([SHIFT] [LINE])
OP(d) Output interrogated Parameter, instructs the HP 8340B/41B to output the numerical value of
any specified function, even if that function is not presently active. The code for any function that
has a numerical value associated with it as appended to OP; for example, OPCF for the center
frequency (but not CFOP), or OPST for the sweep time (but not STOP). The numerical value is
always output in the fundamental units of Hz, dB(m), or seconds. A BASIC example:
100
OUTPUT 719; ,,0PCF"
110
ENTER 719; N
120
PRINT "CENTER FREQUENCY = " ; N ; "HZ"
In this example, N is an arbitrary variable.
OR(d) Output power level, causes the HP 8340B/41B to output the present power level of the instru¬
ment. PLOA, OPPL and OR can be used to output power level, but there is a significant difference
in the implementation of these codes by the HP 8340B/41B. OR causes the power to be measured
by the internal ADC, while PLOA and OPPL reflect the user-requested power that is shown in the
ENTRY DISPLAY.
PLOA or OPPL accurately indicate the power output only when the HP 8340B/41B is internally
leveled and is not being amplitude modulated (AM) by a modulation signal containing a dc compo¬
nent. Under these conditions the values of PLOA, OPPL, and OR will agree to within the toler¬
ances of the measuring circuits (± 0.1 dB).
OR can always be used to measure power output, and must be used whenever any of these
conditions exist: 1)The HP 8340B/41B is unleveled for any reason; 2) the instrument is being
amplitude modulated by a modulation signal having a dc component; 3) the HP 8340B/41B is
being externally leveled.
A BASIC example:
100
OUTPUT 719; "OR"
110
ENER 719; P
120
PRINT "POWER LEVEL = " ; P; "DBM"
OS(2B) Output Status bytes, is used to read the two 8-bit status bytes from the HP 8340B/41B. The
first status byte concerns the cause of an SRQ (Service Request), while the second status byte
concerns failures and faults, as follows:
HP 8340B/41B
Operating Information
3-75
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