# What is the DC Accuracy When the Waveform Position has Been Changed?

Question:
I would like to confirm DC Precision when changing the position setting on DL1600. According to the specification of vertical (voltage) axis accuracy, in the case that voltage axis is set to 0.5 V/div:
• DC Precision:  ±(1.5% of 8 div + offset voltage precision)
• Offset Voltage Precision:   ±(1% of set value + 2 mV)

If DC offset voltage is set to 2.0 V, then the DC precision is ±(1.5% of  8*0.5V + 1% of 2V + 2 mV) = ±82 mV.
However, there is no description about "position" in this equation. What is the equation when I change the position setting?

For example, what is the DC precision when the offset is set to 0 V and the position is set to -4 div?

If DC offset equals 0V and the position is changed, it is necessary to calculate the DC precision supposing the DC offset voltage is set as the same as the voltage corresponding to position changing.

In the previous example, since the voltage scale is set to 0.5 V/div, -4 div corresponds to 2V. So the DC precision in this case is the same as the offset voltage is set to 2 V. In conclusion, the DC precision will be:
±(1.5% of  8*0.5V + 1% of 4*0.5V + 2 mV）= ±(1.5% of  8*0.5V + 1% of 2V + 2 mV）
= ±82 mV

### 相关产品和解决方案

#### DL9000 DSO系列

500MHz、1.0GHz和1.5GHz DSO，用于调试和高性能应用。YOKOGAWA的

#### DLM6000 MSO & DSO系列

500MHz、1.0GHz和1.5GHz DSO/MSO型号，适用于调试、波形特征分析、台式或自动测试应用。带有16或32个逻辑输入的4通道信号。改善了人体工程学设计和屏幕显示的第12代示波器。订单终止日：2012年4月2日；正式停产日：2012年9月底（特注订单）。

#### 数据采集设备

Yokogawa数据采集系统具备出众的灵活性和性能，能测量、显示、存储甚至促动各种物理和电气现象。

#### 波形测量仪器

Yokogawa提供世界一流的数字示波记录仪：数字示波记录仪具有高速采样能力和大测量带宽，可用于设计和开发电子设备。示波记录仪集数字示波器和多通道数据记录仪的优点于一身。

#### 高速数据采集器和数采仪

Yokogawa高速数据采集系统提供业界领先的隔离、位分辨率、采样速率和存储长度，带有独立的通道硬件和使用简单的软件。是示波记录仪中最领先的技术。