Agilent Technologies 4294A Service Manual download pdf (Page 160)

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Service Related Menus

DIAGNOSTIC TEST Menu

(230kHz) signal at a frequency bus node. It checks that each measured value is within

limits.

15: A2/A9 AC OSC LEVEL

Verifies the source circuit in the A2. This test measures the signal level at low frequencies

with the A/D converter in the A2. It checks that the measured value is within limits. It also

checks the floating section control signal of the A2.

16: A2/A9 DC BIAS LEVEL

Verifies the DC bias circuit in the A2. This test measures the DC bias level with the A/D

converter in the A2. It checks that the measured value is within limits. It also checks the

floating section control signal of the A2.

EXTERNAL TEST

This group of tests requires either external equipment and connections or operator

interaction to run. All return a “PASS” or “FAIL” indication on the display except the

external test 17.

17: FRONT PANEL

Checks the RGP and all front panel keys on the A30 keyboard. The abbreviated name is

displayed by pressing one of the keys or by rotating the RPG.

18: FLOPPY DISK DRIVE

Checks the FDD (Flexible Disk Drive). A formatted, blank disk is required. When this test

is started, a bit pattern is written onto the flexible disk. The pattern is then read back and

checked. This write pattern check is repeated from the low to high addresses.

19: 24 BIT I/O

Checks the 24-BIT I/O Port function on rear panel. This test requires I/O Port Test Kit (PN

87510-65002). For a more detailed procedure, refer to the Digital Control Troubleshooting.

20: ALL ANALOG

It consists of external tests 21 through 26.This test requires an OPEN termination

(42090A) or two BNC cables. The tests are done sequentially. If an external test is failed

while performing this test, it stops testing. It then displays the external test item which is

failed and the “FAIL” status. If all pass, it displays the “PASS” status. The internal test

ALL INT must be done and passed before this test is performed. At the end of the test, the

adapter selection of the analyzer is changed to the “NONE” status.

21: A8 IF

Checks the attenuator circuit in the A8. This test requires an OPEN termination (42090A)

or two BNC cables. It must be done before external tests 22, 23, 24, 25, or 26 are

performed. At the end of the test, the adapter selection of the analyzer is changed to the

“NONE” status.

22: A3 VCH / A8 FRONTEND

Checks the circuit in the A3 which senses the voltage across the DUT and transmits the

signal to the A8, it also checks the circuit in the A8 which transmits the signal to the 1st

mixer in the A8. This test requires an OPEN termination (42090A) or two NC cables. It

must be done before external tests 23, 24, 25, or 26 are performed. At the end of the test,

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Agilent Technologies 4294A Service Manual Page 160

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