Performance Verification
4-22 2715 Spectrum Analyzer Service Manual
Pin Signal
1External Video Input
2Sweep Gate
3Chassis/Signal Ground
4Sweep Ramp
5Video Out
6CLK0 Input
7DATAIOutput
8DATAOInput
9ᇓDOLATCHInput
10 26.38 MHz Output
11 VLVLInput
12 SWPSLOPE Input
13 Not Used
14 Not Used
15 Not Used
6. Check for a 0 V to 1.6 V inverted versionof the Spectrum Analyzer display.
7. Monitor pin 2 of J103 (Figure 4--4) with the test oscilloscope. Set the test
oscilloscope sweep rateto 1 ms/div and Volts/div to 2.
8. Press ZERO SPAN,thenpressSWEEP ↓until the readout reads1MS /.
9. Check for an ≈5 V square wave (Sweep Gate).
10. Monitor pin 4 of J103 (Figure 4--4) with the test oscilloscope. Set the test
oscilloscope Volts/divto 0.5.
11. Check for a negative going ramp approximately +1.3 V to --1.3 V.
12. Recall default power up settings by pressing UTIL 1 1.
13. Connect a 15 Hz, 2 Vp-p, and 0 VDC square wave to pin 1 ofJ103.
14. Check that the noise on the display is clamped to the bottom of the screen
approximately every half a division. The display will not be triggered.
15. Disconnect the test oscilloscopefrom J103.
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Figure 4- 4:Accessor y Connector (J103)