067-0502-01/Repairs: Difference between revisions
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(Created page with "If the output voltage is correct at the 100V setting but inaccurate at the other settings, the main cam switch can be the culprit. The bottom of the precision voltage divider...") |
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If the output voltage is correct at the | If the output voltage is correct at the 100 V setting but inaccurate at the other settings, | ||
the main cam switch can be the culprit. The bottom of the precision voltage divider is not | |||
directly grounded but runs through the switch to allow for the current loop position. | |||
These contacts need to be clean to provide a low resistance ground path and accurate output voltages. | |||
Also note that the output voltages measured with a high impedance voltmeter will be off! Don't forget to put a 1 MΩ load resistor in parallel when using a high impedance | Also note that the output voltages measured with a high impedance voltmeter will be off! | ||
Don't forget to put a 1 MΩ load resistor in parallel when using a high impedance voltmeter. | |||
[[Category:Instrument repair reports]] | |||
Latest revision as of 03:47, 5 December 2019
If the output voltage is correct at the 100 V setting but inaccurate at the other settings, the main cam switch can be the culprit. The bottom of the precision voltage divider is not directly grounded but runs through the switch to allow for the current loop position. These contacts need to be clean to provide a low resistance ground path and accurate output voltages.
Also note that the output voltages measured with a high impedance voltmeter will be off! Don't forget to put a 1 MΩ load resistor in parallel when using a high impedance voltmeter.