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Entry  Thu May 20 17:03:50 2021, Koji, General, General, SRS LCR meter SRS720 borrowed from Downs P_20210520_154841.jpg
    Reply  Sun May 30 15:17:16 2021, Koji, General, General, DCPD AF capacitance measirement PD_cap_meas.pdf20210529013015_IMG_0577.jpeg20210529013114_IMG_0580_2.jpeg20210529013200_IMG_0584.jpeg20210529013229_IMG_0586.jpeg
       Reply  Sun May 30 15:32:56 2021, Koji, General, General, DCPD AF capacitance measirement highQEPD_capacitance.pdfC30665_capacitance.pdf
Message ID: 409     Entry time: Sun May 30 15:17:16 2021     In reply to: 408     Reply to this: 410
Author: Koji 
Type: General 
Category: General 
Subject: DCPD AF capacitance measirement 

Attachment 1: System diagram. The reverse bias voltage is controlled by DS335. This can produce a voltage offset up to 10V. A G=+2 opamp circuit was inserted so that a bias of up to +15V can be produced. The capacitances of the photodiodes were measured with SR720 LCR meter with a probe. DS335 and SR720 were controlled from PC/Mac via serial connections.

Attachment 2: Overview

Attachment 3: How was the probe attached to the photodiode under the test

Attachment 4: The bias circuitry and the power supply

Attachment 5: G=+2 amp

Attachment 1: PD_cap_meas.pdf  23 kB  Uploaded Sun May 30 16:17:31 2021  | Show | Show all
Attachment 2: 20210529013015_IMG_0577.jpeg  2.602 MB  Uploaded Sun May 30 16:20:50 2021  | Show | Show all
Attachment 3: 20210529013114_IMG_0580_2.jpeg  2.526 MB  Uploaded Sun May 30 16:29:44 2021  | Show | Show all
Attachment 4: 20210529013200_IMG_0584.jpeg  2.482 MB  Uploaded Sun May 30 16:30:41 2021  | Show | Show all
Attachment 5: 20210529013229_IMG_0586.jpeg  1.523 MB  Uploaded Sun May 30 16:32:23 2021  | Show | Show all
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