DSP filter problem in modifying the Oscilloscope

The hardware and software I am using are:
LabVIEW: 5.1.1
DAQ device: PCI-MIO-16XE-50
VI programs: 2 Channel Oscilloscope(sample VI)
I want to modify the function of the sample VI of 2 Channel Oscilloscope to simulate the AC-GND-DC function of Real Oscilloscope.
I try it by using "Butterworth Filter" under
Function-->Signal Processing-->Filters to cut the frequency at 0Hz for "AC" function (cut all DC).
However, the output is not good as real Oscilloscope becasue the signal seen is not good and stable.
I even use order 10 filter to do it. But the result is also the same.
Any suggestions to my problem?

The ac-coupling of an oscilloscope is not a filter a "0" Hz. It is normally just a simple capacitance that, with the 1MOhm input impedance of the oscilloscope, acts like a first order high-pass filter with a cut-off frequency of few hertz.
Try to implement a highpass Butterworth filter of order 1 and with a low cut-off frequency of 10 Hz.
You can then play with the cut-off frequency and see which value works best for you (remember to connect the right value to the sample frequency input of your filter). You can also try to increase the filter order to 2 (some measurement devices have input high-pass filters of order 2 or even 3).

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#import "led.h"
@class PickerViewController;
@interface ControlBoxCookeAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
PickerViewController *pvController;
SerialManager *portCunima;
int portin,portout; // numero de port de com in-out
UILabel *Led_Operateur;
-(void)Modifie_luma:(CGFloat)luma;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@end
// ControlBoxCookeAppDelegate.m
// Control Box Cooke
// Created by Bruno on 1/11/10.
// Copyright _MyCompanyName_ 2010. All rights reserved.
#import "SerialManager.h"
#import "ControlBoxCookeAppDelegate.h"
#import "PickerViewController.h"
#include <fcntl.h>
#include "Led.h"
@implementation ControlBoxCookeAppDelegate
@synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after application launch
[window makeKeyAndVisible];
//RootViewController.m
- (void)applicationDidFinishLaunching:(UIApplication *)application {
pvController = [[PickerViewController alloc] initWithNibName:@"pickerview"/@"MainWindow"*//@"Control Box Cooke"//*@"PickerView"/ bundle:[NSBundle mainBundle]];
Led_Operateur= [[Led alloc] initWithFrame:CGRectMake(20,50,280,20)];
Led_Operateur.text=@" ";
[Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: 0.5]];
[pvController.view addSubview:Led_Operateur];
[window addSubview:pvController.view];
Led *ZoneA;
CGRect Dimension;
ZoneA = [[Led alloc]initWithFrame:Dimension];
[pvController.view addSubview:ZoneA];
[window addSubview:pvController.view];
[ZoneA Modifie_luma:0.5];
[ZoneA release];
// Override point for customization after application launch
[window makeKeyAndVisible];
Led *Led1;
CGRect frame;
Led1=[[Led alloc] initWithFrame:frame];
[pvController.view addSubview:Led1];
[window addSubview:pvController.view];
[Led1 release];
[label release];
[Error_message release];
[path_port release];
- (void)dealloc {
[Led_Operateur release];
[pvController release];
[window release];
[super dealloc];
-(void)Modifie_luma:(CGFloat)luma
pvController = [[PickerViewController alloc] initWithNibName:@"pickerview" bundle:[NSBundle mainBundle]];
Led_Operateur= [[UILabel alloc] initWithFrame:CGRectMake(20,50,280,20)];
Led_Operateur.text=@" ";
[Led_Operateur setBackgroundColor: [ UIColor colorWithWhite:1.0 alpha: luma]];
[pvController.view addSubview:Led_Operateur];
[window addSubview:pvController.view];
[window makeKeyAndVisible];
@end

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Any help would be great.
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