How to measure the leakage for Dose2?
In order to measure the leakage of Dose2, please perform following steps:
A common issue that contributes to leakage is the cleanliness of the triaxial connectors. Even the smallest microns of dust can cause large amounts of leakage. The consistent use of the connector dust caps when the device is not in use will help ensure years of trouble-free use.
If it is determined that a device has high leakage, use compressed air to clean out the triaxial connectors.
Electrometer Warm-up and Zeroing
Ensure nothing is attached to the electrometer and the dust cap is secured to the triaxial connector.
Make sure that the connectors are clean. If you see some dust, try to clean it carefully with dry and compressed air.
Power on your electrometer. A minimum of 2 hours should be allowed for the electrometer to warm up. Or better leave the DOSE2 overnight.
After allowing the electrometer to warm up, select the range of operation (low or high).
Use the “zeroing” feature to zero the electrometer. The dust cap must remain on during the zeroing process, as it completes the electrical shielding of the connector’s internal components.
Checking the Electrometer Leakage
Select the low range of the electrometer.
Apply the desired bias voltage (typically +300 V).
Immediately begin to monitor the system current (i.e. “rate”). The passing leakage requirement is that the current must be less than ±0.025 pA after 100 seconds of applying bias and remain stable.