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Performance Verification
2715 Spectrum Analyzer Service Manual
4-9
5. When the sweep oscillator has finished its sweep, press MKR/∆/OFF to
activate the marker.
6. Press MKR/∆/OFF again to activate the delta marker and tune it to the
highest and lowest points on the response curve. Note the amplitude at both
markers.
7. Check the delta marker amplitudes as follows:
H All instruments except Option 50 and Option 75 - not to exceed ±2dB.
H Option 50 and Option 75 instruments - not to exceed ±2 dB from 9 KHz
to 1.8 GHz, not to exceed ±3 dB from 1.8 GHz to 2.15 GHz.
Verify proper marker operation with the following procedure:
1. Recall default power up settings by pressing UTIL 1 1.
2. Select the following settings on the Spectrum Analyzer:
FREQUENCY 500 MHz
REFERENCE LEVEL --10 dBm
SPAN/DIV 100 MHz
RESOLUTION BW 300 kHz
VID FLTR On
VERTICAL SCALE 10 dB/
3. Enable the calibrator by pressing INPUT 9. The instrument should display a
series of 100 MHz marks of varying amplitudes.
4. Press PEAK FIND. The marker should go to the highest signal, and the
readout should display that signal’s frequency and amplitude. Frequency and
amplitude readouts are preceded by the letter M.
5. Press MKR [ ' ] and note that the marker moves to the next signal to the
right and the readouts are updated. Continue pressing MKR and observe the
marker position and readouts. The marker will only recognize those signals
whose amplitude is above a preset or default threshold level, and will not
recognize apparent signals ≤0 Hz. The threshold level is set via MKR/
FREQ 0.
6. Repeat step 5 using the MKR [ a ] button.
7. Press MKR/∆/OFF once. The readouts should now be preceded by the letter
D and should read 0.
8. Tune the FREQ/MKRS control and note that a second marker appears. The
marker readout should now display frequency and amplitude differences
between the two markers.
Marker Operation