MP1500 Peak Level Analyzer

New type of measuring instrument that measures and analyzes only the peak values



Peak Level Analyzer MP1500 is a new type instrument which equips with a high-speed analog peak hold circuit, captures only peak voltages (plus peak and minus peak) of input signal and analyzes the voltages. MP1500 is very useful for development or manufacturing of CD, CD-ROM, MO, HD and LD. A big reduction in working hour and of sight error can be expected in comparison with a conventional measurement, adjustment or inspection by oscilloscope.

APPLICATION
Adjustment, inspection and analysis for an optical disk [CD, CD-ROM, LD]
Inspection and analysis for a magneto-optical disc [MD, MO]
Amplitude margin check for a hard disk [HD]
Level fluctuation measurement for an oscillator


OPERATION PRINCIPLE

MP1500 equips with two peak hold circuits for plus and minus. At the moment input signal arrives at plus peak point, the peak voltage is stores in a plus peak hold circuit. And at the moment input signal arrives at zero point (0 volt), A / D clock is generated and the peak voltage is converted to digital data by A / D converter. And then +RESET is generated and a plus peak hold circuit becomes a ready state for next cycle as it is reset. A minus peak hold circuit operates as same. So that plus and minus peak data are stored in the memory by turns.

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ANALYSIS MODE

(1) 3T / 11T ANALYSIS
Peak to peak voltage and the ratio of 3T signal and 11T signal which are recording signals of optical disk or
magneto-optical disc are calculated on the basis of measured peak voltages and display on LCD.
COUPLING is usually set to AC and CAPTURING MODE is set to PERIOD.

[CALCULATION and DEFINITION]
Zero address data, the biggest 4 and the smallest 4 data of 4096 data are thrown away and the remaining 4087
data are made the targets of average value calculation of plus and minus peak ;

+3T = { (+P1) + (+P2) + ••• + (+P256) } / 256
[Average of the smallest 256 data of plus peaks]

+11T = { (+P1)+(+P2) + ••• + (+P256) } / 256
[Average of the biggest 256 data of plus peaks]

-3T = { (-P1) + (-P2) + ••• + (-P256) } / 256
[Average of the biggest 256 data of minus peaks]

-11T = { (-P1) + (-P2) + ••• + (-P256) } / 256
[Average of the smallest 256 data of minus peaks]

The following calculation is done to be based on above ;
3T = (+3T) - (-3T)
11T = (+11T) - (-11T)
3T / 11T = 3T / 11T 100(%)

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At this analysis mode, the total number of plus and minus peaks must be more than 4069 during 100ms if CAPTURING MODE is set to PERIOD.

[LCD DISPLAY]
Setting information and analysis results are displayed on LCD as follows ;

3T / 11T ANAL [CH1] [DC] [4V / F] [NUM]
<3T> 1.78Vp-p @ @ @ @
<11T> 3.51Vp-p @ @ @ @
<3T / 11T> 50.7% @ @ @ @

(2) PEAK ANALYSIS
Plus peak voltage, minus peal voltage, peak to peak voltage and offset voltage are calculated on the basis of measured
peak voltages and displayed on LCD.
COUPLING is usually set to DC and CATURING MODE is set to PERIOD.

[CALCULATION and DEFINITION]
Zero and 21 to 4095 address data of 4096 data are thrown away and 1 to 20 address data are made the targets. Moreover
minimum and maximum data of 10 plus peak data are thrown away and the remaining 8 data are made the targets. Minus
peak data are also same.

+P = { (+P1) + (+P2) + ••• + (P8) } / 8-P = { (-P1) + (-P2) + ••• + (-P8) } / 8

The following calculation is done to be based on above ;
P-P = (+P) - (-P)
OFFSET= { (+P) + (-P) } / 2

At this analysis mode, the total number of plus and minus peaks must be more than 21 during 100ms if CAPTURING MODE is set to PERIOD.

[LCD DISPLAY]
Setting information and analysis results are displayed on LCD as follows ;

PEAKANAL [CH1] [DC] [4V / F] [NUM]
<+P> 0.894V <P-P> 1.44V @
<-P> -0.546V <OFFSET> 0.174V @

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(3) STATISTICS ANALYSIS

Maximum value (MAX), minimum value (MIN), average value (AVE) and 3S are calculated on the basis of each 2048 data of plus and minus peaks.  

At thisanalysis mode, the total number of plus and minus peaks must be more than 4096 during 100ms if CAPTURING MODE is set to PERIOD.

[LCD DISPLAY]
Setting information and analysis results are displayed on LCD as follows ;

STATISTICS [CH1] [DC] [4V / F] [NUM]
@ <MAX> <MIN> <AVE> <3U>
<+P> 1.73V 1.13V 1.41V 0.602V
<-P> -1.41V -1.98V -1.70V 0.570V

MEASURING SEQUENCE

There are two measuring sequence due to CAPTURING MODE.


(1) PERIOD (TIME CONSTANT MODE)
The capturing period of data is 100ms constant. The peak values are measured during 100ms, converted by A / D converter and then stored in a capturing memory. And after then the data are transferred to a working RAM. 

The next measuring cycle starts at the moment of completion of the above operation. On the other hand, the calculation starts.
At the moment of completion of the calculation, the results of the calculation are output to LCD port and I / F port.
At this mode, 3T / 11T and STATISTICS analysis need more than 4096 data and PEAK analysis needs more than 21 data.

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(2) NUMBER (DATA NUMBER CONSTANT MODE)
The capturing period is till capturing 4096 data. Therefore the period is due to input frequency. If the calculation and port output of a last cycle have been already finished at the moment of being stored in a capturing memory, the data are transferred to a working RAM. If not yet, the data are transferred after finished. Soon after transferring data, the next cycle starts.

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RUN / STOP
At the moment RUN / STOP is switched to RUN, the capture starts. The capture stops at the moment of completion of the current cycle when RUN / STOP is switched to STOP. Reading original data (raw data) is available only at the stop state.



INTERFACE

Interface circuit is isolated by photo couplers. In case of control by a personal computer, PIO (parallel in / out) interface board at PC side is convenient. The measured data DATA 0 to 7 is negative logic at the interface connector.

One analysis item selected is output to DATA 0 to 7 at connector. Analysis mode is due to from panel control or external control, but analysis item is decided only by ANALYSIS 2 to 4 of connector on the rear panel no related to LOCAL / REMOTE switch. As ANAL OUT 0 and 1 output a current analysis item, monitoring these two bits is useful at LOCAL.

READING ORIGINAL DATA

Original (raw) plus and minus peak values can be read. RESET or CLOCK signal are input by supplying "0" "1" to

ANALYSIS 2 or 3. It is available only at the stop state to read original data.


Specifications
Input section
Bandwidth 50Hz to 3MHz
Input resistance 1Mohm 1%
Input coupling DC and AC
Input sensitivity 1, 2, 4V / FULL
Accuracy 5% of Full scale 1LSB
Input channels 8channels
Input damage level

50V (DC + AC peak) max

Peak detect section
Resolution 8bits
Voltage conversion range

Ex. In case of 4V / FULL +Full = +2V, -Full = -2V
Min. peak to peak time

more than 167ns

*Time from plus peak to minus peak or from minus peak to plus peak.

Memory section
Memory size

4096 8bits
*Additional memory is available as an option.

Data format




+Full: 255 (FFH)

0V: 128 (80H)

-Full: 0 (00H)

*Negative logic at an interface connector.

Capture data
Capture mode PERIOD and NUMBER
  Period Data are captured during about 100ms
   Number 4096 data are captured
Control RUN and STOP
Analysis mode
3T / 11T analysis

3T (peak to peak voltage of 3T recording signal), 11T (peak to peak voltage of 11T recording signal) and 3T / 11T (ratio of 3T and 11T)

Peak analysis +P (plus peak value), -P (minus peak value) and OFFSET (offset voltage)
Statistics analysis

MAX (maximum value), MIN (minimum value), AVE (average value) and 3U

Output section
Display 4lines 40characters LCD with backlight

Monitor output

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A signal of selected channel of CH1 to CH8 is output.
Output resistance is 50ohm approx.

Interface
In / output circuit Due to photo couplers
Interface condition Direct connection to PIO module, IRT-32 (98) E / PO-32 (98) E (CONTEC) is available.

Connector pin assignment

Pin no. Signal Pin no. Signal
1 DATA 0 19 ANALYSIS 0
2 DATA 1 20 ANALYSIS 1
3 DATA 2 21 ANALYSIS 2
4 DATA 3 22 ANALYSIS 3
5 DATA 4 23 ANALYSIS 4
6 DATA 5 24 ANAL OUT 0
7 DATA 6 25 ANAL OUT 1
8 DATA 7 26 RUN / STOP
9 READY 27 TRIG CPLG
10 (NC) 28 COMMON
11 INPUT CH 0 29 COMMON
12 INPUT CH 1 30 COMMON
13 INPUT CH 2 31 COMMON
14 COUPLING 32 (NC)
15 V / FULL 0 33 +24V
16 V / FULL 1 34 +24V
17 (NC) 35 +24V
18 CAPTURING 36 +24V
Analysis setting
Analysis mode Analysis item ANALYSIS/ANAL OUT
4 3 2 1 0
3T / 11T 3T 0 0 0 0
11T 0 1 0 0
3T / 11T 1 0 0 0
PEAK +P 0 0 0 1
-P 0 1 0 1
P-P 1 0 0 1
OFFSET 1 1 0 1
STAT +P MAX 0 0 0 1 0
+P MIN 0 0 1 1 0
+P AVE 0 1 0 1 0
+P 3U 0 1 1 1 0
-P MAX 1 0 0 1 0
-P MIN 1 0 1 1 0
-P AVE 1 1 0 1 0
-P 3U 1 1 1 1 0
Original data CLOCK
RESET
1 1
General
Operating temperature 0 to 40ºC (Guaranteed at 23 10ºC)
Operating humidity less than 40ºC / 90%RH (Guaranteed at less than 33ºC / 80%RH)
Storage temperature -10 to 60ºC, less than 60ºC / 80%RH
Power supply 90 to 127V AC
Power consumption approx. 31VA
Dimensions 430 (W) 99 (H) 440 (D) mm
Weight approx. 16.5kg
Accessories: Power cable (1pc) 
Fuse (1pc)
Instruction manual (1pc)
Options : Memory addition
Rack mount kit
BNC coaxial cable

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