State- And Trace-Storage Problems; State- And Trace- Storage Problems - Agilent Technologies 8564EC Service Manual

Spectrum analyzers

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State- and Trace-Storage Problems

State storage is in the two of the four Program RAMs and trace storage

is in the two display RAMs. With low battery voltage, it is normal for

states and traces to be retained if the power is off for less than

1 minute. If the power is left off for more than thirty minutes with low

battery voltage, the stored states and traces will be lost.

The following steps test battery backup:

1. Measure the voltage on W6 at A2J3. If the voltage is less than 2.6 V,

check the BT1 battery.

2. If the battery voltage is correct, reconnect W6 to A2J3, turn the

analyzer power off and wait 5 minutes.

3. Measure the voltage at A2U19 pin 32and A2U26 pin 32.

4. If the voltage is less than 2.0 Vdc, the RAM power battery-backup

circuitry on the A2 controller assembly is probably at fault.

Controller Section

State- and Trace-Storage Problems

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