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Search found 13 matches

by txz033000
April 8th, 2016, 3:51 pm
Forum: 2400 Series SourceMeter
Topic: 2400 time out in Labview
Replies: 1
Views: 10982

2400 time out in Labview

Hi, I am using Labview 2010 through GPIB port to control one Keithley 2400. I am ramping up the output voltage of 2400 and measuring the current. however at each voltage, I may do hours current measurement/sampling; sometimes I got an error message like the photo, does anyone has any idea what is ca...
by txz033000
March 9th, 2015, 3:17 pm
Forum: PicoAmmeters
Topic: smallest current compliance of 6487 when output 250V ?
Replies: 1
Views: 18257

smallest current compliance of 6487 when output 250V ?

Hi, All, I am trying to use our Keithley 6487 to drive one electronic device, but we got some scum/native oxide at the device interface, therefore at first we need to use a high voltage like 250V to break down this scum/native oxide, in order to get electrical signal to the device.((actually it is t...
by txz033000
December 22nd, 2014, 9:45 pm
Forum: PicoAmmeters
Topic: can the meter of 6487 - up incident electron beams?
Replies: 1
Views: 18264

can the meter of 6487 - up incident electron beams?

Hi, All, at this moment, I am using the - ampere meter of my 6487 unit to measure the beam current of an electron source. basically the electron source could emit electrons by excitation and I use a metal plate as a collector to collect those electrons, with the help of an external 2kV DC power supp...
by txz033000
December 22nd, 2014, 9:32 pm
Forum: PicoAmmeters
Topic: use two 6487 to ouptut 1000V
Replies: 4
Views: 25512

Re: use two 6487 to ouptut 1000V

Brian,
thanks for the reply. actually I started another post asking about how to protect the current meter of my 6487, and got an answer there. but I would still like to post my set-up, in case you have any comment.
by txz033000
December 8th, 2014, 4:13 pm
Forum: PicoAmmeters
Topic: how to protect the current meter of 6487
Replies: 1
Views: 18110

how to protect the current meter of 6487

Hi, All, I have been asking questions about current meter of Keithley 6487, so I will make it a separate post. I have an external voltage supply which could output up to 2KV. I want to use the - meter of 6487 to measure the current in this loop, which should be no more than 100nA. ( if current was m...
by txz033000
December 8th, 2014, 8:00 am
Forum: PicoAmmeters
Topic: use two 6487 to ouptut 1000V
Replies: 4
Views: 25512

Re: use two 6487 to ouptut 1000V

Brian, thanks for the reply. fortunately I located one 2kV voltage supply, so I don't think I need to connect two 6487 to output 1000V. However, I am still thinking to use the - current meter of 6487 to measure the current flow through 2kV voltage supply because the expected current flow should be n...
by txz033000
December 5th, 2014, 10:26 am
Forum: PicoAmmeters
Topic: use two 6487 to ouptut 1000V
Replies: 4
Views: 25512

use two 6487 to ouptut 1000V

Hi,
I want to output 1000V, but only have two Keithley 6487 at hands. each could output 500V maximum. I wonder if I can link them in serial and output 1000V?

regards,
tao
by txz033000
December 2nd, 2014, 10:41 am
Forum: PicoAmmeters
Topic: 6487 and 2400 share negative/ground output
Replies: 4
Views: 26770

a new development

Andrea, we still plan to use Keithley 6487 and 2400 to test our device, which is filed electron-emitter. so a metal piece is used as electron emitter. a nearby metal ring as a gate are in positive potential relative to emitter to extract electron out of the emitter. A metal plate which is a few mm a...
by txz033000
December 2nd, 2014, 10:20 am
Forum: PicoAmmeters
Topic: 6487 only output 265V
Replies: 2
Views: 19965

an expanantion?: 6487 only output 265V

Hi, I found out if I set the current limit ( accomplice level) on the 6487 higher, I will get the voltage I set for. for example, if I set the current limit to 2mA and let 6487 output 400V, I measured with DMM and got a reading of 400V, but at the same time the current meter of 6487 reads about 40uA...
by txz033000
December 2nd, 2014, 9:34 am
Forum: PicoAmmeters
Topic: 6487 only output 265V
Replies: 2
Views: 19965

Update: 6487 only output 265V

Hi, I tried again this morning, if I directly link the output of the 6487 to a DMM, I got the voltage value whatever I set up either manually or remotely. for example, I set 411V, I got 411V on the DMM. but if I include the current meter of the same 6487 unit into my measurement loop, I got a leakag...
by txz033000
December 1st, 2014, 6:30 pm
Forum: PicoAmmeters
Topic: 6487 only output 265V
Replies: 2
Views: 19965

6487 only output 265V

Hi, All, I have one Keithley 6487 at lab. when I use Labview control the unit and let it output voltage, it behaves normally until the setting is beyond 265V. if you set it output more than 265V, for example 300V, you will get 265V no matter what the setting is. I measured the voltage using Fluke 83...
by txz033000
October 21st, 2014, 1:55 pm
Forum: PicoAmmeters
Topic: 6487 and 2400 share negative/ground output
Replies: 4
Views: 26770

Re: 6487 and 2400 share negative/ground output

Andrea, thanks for the reply. when we use 6487 to output 300V, we should not expect a current over 1mA. if it is over 1mA, we would be really surprised and happy. the 200uV voltage burden of the ampere meter is not a problem, but good to know. about the "breakdown" scenario, I think it is probably n...
by txz033000
October 20th, 2014, 1:11 pm
Forum: PicoAmmeters
Topic: 6487 and 2400 share negative/ground output
Replies: 4
Views: 26770

6487 and 2400 share negative/ground output

Hi, All, I have a device like a transistor , need to bias the gate-source to +50V, and at the same time to bias the drain-source to +300V. the source is set as zero voltage. I plan to use Keithley 6487 to apply the drain-source voltage and use Keithley 2400 to apply the gate-source voltage. Then I h...

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