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Frequency Marker Keys
DESCRIPTION
This key group selects the five markers, the marker functions (MARKER SWEEP, MARKER DELTA,
and MARKER TO CENTER FREQUENCY), and several diagnostic functions that are used during
servicing.
PANEL LAYOUT
FUNCTIONS
[M1]...[M5](HP-IB:
M1...M5) keys select markers 1-5. Press one [M1]...[M5] key, and the present
value of that marker will appear in the ENTRY DISPLAY. Use either the rotary
[KNOB],
the
[STEP]
keys, or the numerical keys with a terminator key to set the desired marker frequency. Repeat this
process for the other markers as needed. If the initial marker frequency is outside of the current
sweep range, a slight turn of the
[KNOB]
will bring the frequency of that marker to the center fre¬
quency of the sweep, markers are normally displayed as z-axis intensity dots but can be changed to
amplitude "dips" (an abrupt discontinuity in the sweep trace) by pressing
[AMTD MKR],
as explained
in Figure 3-17. The markers are functional whenever their individual LEDs are lighted; however, only
one marker can be "active" at a time (the "active" marker is shown in the ENTRY DISPLAY, and can
be changed via
[KNOB], [STEP]
keys, or numerical keys with a terminator key). Press any marker key
to make that marker active. After
[INSTR PRESET]
all markers are initialized to 13.255 GHz on the HP
8340B and 9.995 GHz on the HP 8341B; otherwise, the last-used marker values will be remembered
by the HP 8340B/41B (for up to three years), even with disconnected ac power.
[SHIFT] [Ml]
(HP-IB:
SHM1) is a service diagnostic that shows (from left to right), the M divisor, N
divisor, M/N frequency, and 20/30 loop frequency. Consult the In Case of Difficulty section for addi¬
tional information.
[SHIFT] [M2]
(HP-IB:
SHM2) is a service diagnostic that shows (from left to right), the band number
and the YIG oscillator (YO) frequency. Consult the In Case of Difficulty section for additional informa¬
tion.
[SHIFT] [M3]
(HP-IB:
SHM3) is a service diagnostic that shows, from left to right, the PLL #2 VCO
frequency and the PLL #3 upconverter frequency. Consult the In Case of Difficulty section for addi¬
tional information.
Figure 3-9.
Frequency Marker Keys (1 of 2)
3-24
Operating Information
HP 8340B/41B
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