6031A共模校准问题

共模校准完成后，未连接100欧姆电阻？
只有1K正确吗？
是的正确！1）b）部分说明后面板上的短电源检测端子（+ S到-S），但如果连接了本地传感带，是否也意味着输出端子短路？
仪器的输出设置为（零），输出电流设置为（零）＆amp;
输出为OFF。
然后通过1K电阻将后面板上的Common（M）连接DVM并连接到A2J7 pin3。
然后进行初步阅读。
2）我在图2-1中进行了设置，但显示屏显示电压为OL（过载）。
我做错了什么吗？
我检查了极性，并删除了当地的感应带。
显示屏表示电压为OL（过载），您是在谈论仪器还是连接到1 K电阻的DVM？
这个步骤完成了吗？
从后面板接线盒上拆下两个本地传感带，并将一个1伏外部电源与其+导线连接到 - S及其 - 导线 - 输出。
请参见图2-1.3）如果我执行了电压监控器零点校准，那么共模校准中的初始读数是否应接近零，如电压监控器零点校准所实现的那样？
4）我试过任何一种方式进行共模校准。
初始读数为0.065mV（局部传感带断开）或0.00001mV（局部传感带连接到输出），但在-S（感测）和-V（ - 输出）之间施加1V后，我得到-250mV的值
并且一直调整A2R21只能给我-247mV到-252mV的某个地方，无法接近初始读数。
我是不是做错了什么？我使用HP 3478A多中心和E3640A产生1V，是的，我有一个1kΩ的电阻来测量V-MON .The 1K电阻连接到在A2board（缓冲V-MON）（J7
引脚3）后面板屏障块没有Vm .E3640A是CV恒流模式吗？有任何建议表示赞赏。
非常感谢提前.Wonghoi



以下为原文

When the Common Mode Calibration is done the 100 ohm resistor is not connected? Only the 1K correct? Yes correct!

1) Section b) says short power supply sense terminals (+S to -S) at rear panel, but if the local sensing straps are connected, does it also mean shorting the output terminals as well? The output of the instrument is set to (Zero), the output Current is set to (Zero) & the output is OFF.
Then attach the DVM from Common (M) on the rear panel through a 1K resistor and connect to A2J7 pin3. Then take the initial reading.

2) I did the setup in Figure 2-1 but the display says OL (overload) for voltages. Did I do anything wrong? I checked to polarities and removed the local sense strap. The display says OL (overload) for voltages, are you talking about the instrument or the DVM connected to the 1 K resistor?

Was this Step e done? Remove both local sensing straps from rear-panel terminal block, and connect a 1-volt external power supply with its +
lead to - S and its--lead to - Out. See Figure 2-1.

3) If I performed Voltage Monitor Zero Calibration, should the initial reading in Common Mode Calibration be close to zero, as achieved by the Voltage Monitor Zero Calibration?

4) I tried either way for Common Mode Calibration. Initial readings are either 0.065mV (local sense strap disconnected) or 0.00001mV (with local sense strap connected to output), but after apply 1V between -S (- sense) and -V (- output), I get something like -250mV and adjusting A2R21 all the way only give me somewhere -247mV to -252mV, nowhere close to the initial reading. Am I doing something wrong?

I'm using HP 3478A multicenter and E3640A to generate 1V, and yes, I had a 1kOhm resistor to measure V-MON .
The 1k resistor is connected to (V-MON buffered) on the A2board (J7 pin 3) not to Vm on the rear panel barrier block.
Is the E3640A in CV Constant Current mode?
Any advice is appreciated. Thanks a lot in advance.
wonghoi

非常感谢carlp。
原来我忽略了图2-1中+ S和-S之间的短路，并且当我按照手册中的描述移除感应引线时完全断开了桥接。
一旦我有+ S和-S短路，+ OL显示消失，电压校准进行顺利。现在我正在尝试执行恒流零点校准，但我再次获得-OL信息，如图2-3中的设置（
服务手册第18页）。
同样，调整A8R29不会使DMM读数移动太多，也不会接近0V。
图2-3没有+ S和-S之间的短路。
有什么建议吗？谢谢。



以下为原文

Thanks a lot carlp. Turned out I overlooked the short between +S and -S in Figure 2-1 and disconnected the bridge altogether when I 'remove the sense leads' as described in the manual. Once I have +S and -S shorted, the +OL display is gone and voltage calibration went smoothly.

Now I'm trying to perform Constant Current Zero Calibration but I got an -OL message again with the setup in Figure 2-3 (page 18 of the service manual). Again, adjusting A8R29 doesn't move the DMM reading much and it's not close to 0V. Figure 2-3 doesn't have a short between +S and -S. Any suggestions?

Thanks.

嗨，我不确定为什么这不起作用。
我确实有一些问题可以帮助我们。
您在DMM上测量的是什么？
你有多接近8 mV？
你能仔细检查你的设置吗？



以下为原文

Hi,

I am not really sure why this is not working. I do have a few questions that will help us. What are you measuring on your DMM? How close are you to the 8 mV? Can you double check your setup?

嗨MattC，事实证明如果我在图2-3中的+ S和-S之间放一个短路（从图2-1中推断），我可以继续校准，但它没有写成图2-3所示。
它可能是服务手册中的拼写错误还是我误解了一些东西（服务手册没有解释理由很多）Thanks.Cheers，Hoi



以下为原文

Hi MattC,

It turns out I can continue the calibration if I put a short between +S and -S in Figure 2-3 (extrapolated from Figure 2-1), but it's not written as drawn in Figure 2-3. Could it be a typo in the service manual or I misunderstood something (the service manual doesn't explain the rationale much)

Thanks.

Cheers,
Hoi

你好Hoi，你是第18页，与CURRENT Monitor＆amp;
零（如果是，则不需要+/- Sense之间的短路）？[电流监视器零点校准]需要在+/-输出母线（项目b）上进行短路。
（图2-3，显示+ Sense连接到+输出＆amp; -Sense连接到-Output）[恒流零点校准]要求Rm（1.0欧姆电阻）放在+/-输出母线上（图2-3）
）。
当编程“0”电流时，DVM读数将反映流过Rm的电流。注意，



以下为原文

Hello Hoi,

Are you on page 18, working with CURRENT Monitor & Zero (if so, a short between +/-Sense is not required)?

[Current Monitor Zero Calibration] requires a short be placed across the +/- Output buss bars (item b). (Fig 2-3, shows +Sense connected to +Output & -Sense connected to -Output)

[Constant Current Zero Calibration] requires Rm (1.0 ohm resistor) be placed across the +/- Output buss bars (Fig 2-3). DVM reading will reflect the current flowing through Rm, when "0" current is programmed.

Regards,