公开(公告)号：SE344635B

公开(公告)日：1972-04-24

申请号：SE1066667

申请日：1967-07-18

Applicant: TECHNICON INSTR

Inventor： WESCHLER W

IPC: G01D9/00 ,  G01D9/02 ,  G01N35/00 ,  G01N35/08 ,  G01R17/00 ,  H03H7/01 ,  H03H11/12 ,  G01D5/12 ,  G01D5/24

Abstract: 1,184,069. Recording photo-electric measurement signals. TECHNICON CORP. July 6, 1967 [July 18, 1966],No.31153/67. Headings G1A and G1U. In the recording of electrical measurement signals, which are to be filtered to remove cyclical noise, the signals are passed through a circuit including a capacitative arrangement which is switchable between two resistor arrangements. With one it forms a low time constant circuit enabling it to follow signal variations. With the second it forms a high time constant circuit, suitable for filtering noise from the signals. The switching of the capacitative arrangement is arranged so that a flat steady value is quickly attained for recording. The capacitative arrangement comprises two capacitors, one of which is switched from its low to its high time constant condition, a fraction of a noise cycle (preferably about a half) after the other, so that the initial cyclical noise, which might delay the attainment of a steady value, is cancelled out. The circuit is similar to that described in Specification 1,183,981 but instead of a single capacitor connected between earth and the switch for switching it between the two resistor arrangements, the circuit comprises two capacitors of the same or similar value in parallel. Normally, there is no signal from the programming means on line 70 so that relays 54R and 56R are deenergized and the capacitors 62, 64 are in their low time constant conditions, following the signal variations. A signal then appears on line 70 representing the fact that a measurement signal is entering the filtering channel. The relay 54 is switched over, to connect the capacitor 62 into its high time constant circuit. At the time of switching the cyclical noise may be at a peak value e.g. at the peak of a positive half cycle. Thus, if only this capacitor 62 were being used in the filter circuit, as in the above mentioned Patent, owing to the high time constant, it would take a long time for the capacitor 62 to discharge to the steady state value representative of a filtered measurement signal. The switching of the other capacitor 64 is therefore delayed for half a noise cycle, so that when switched over it is charged by the negative half cycle noise peak and this cancels with the positive peak stored by capacitor 62. In fact, the switching of capacitor 64 may be slightly less than a half cycle afterwards, since the capacitor 62 will have discharged slightly. Alternatively the value of the second capacitor 64 is slightly less than that of 62.

公开(公告)号：SE340190B

公开(公告)日：1971-11-08

申请号：SE1039467

申请日：1967-07-07

Applicant: TECHNICON INSTR

Inventor： PELAVIN M ,  NEGERSMITH K ,  WESCHLER W

IPC: G01N33/49 ,  A61B5/155 ,  G01N33/483 ,  G01N35/08 ,  G01N21/26

Abstract: 1,192,192. Determining blood characteristics. TECHNICON CORP. 22 June, 1967 [11 July, 1966], No. 28851/67. Heading B1X. Apparatus for determining blood characteristics comprises supply means 12 for providing an initial stream of the samples to be tested; means 30, 32, 34, 36 coupled to junction 20 for providing a plurality of quotient streams, each containing a fractional portion of each of the samples in the initial stream; first treating means coupled to tube 34 for treating one quotient stream for HCT analysis, first determining means for measuring the HCT for example by continuous measurement of the resistance of the stream by means of electrodes 54 and for providing a signal responsive to the HCT measurement; second treating means for treating another of the quotient streams for analysis and second determining means for making the appropriate measurement and providing a signal responsive to it; and recording means 132 for receiving the signals and recording in correlation the signals obtained by measurements on the fractional portions of a common sample of the initial stream. The quotient stream in tube 30 may be twice diluted with saline (at junctions 58 and 76) then passed through phaser coil 80 (see 1,183,631) to counter module 84 for RBC determination. The quotient stream in tube 32 may be lysed with water added at 107, mixed with ferricyanide-cyanide reagent at 116 to convert the haemoglobin to cyanomethaemoglobin and passed through phaser coil 121 to colorimeter 130 for HGB measurement. The quotient stream in tube 36 may be lysed with acetic acid and a surfactant added at 96, and passed through phaser coil 104 to counter module 84 for WBC determination. MCH, MCV and MCHC are calculated from the measured characteristics and all seven characteristics of the sample are printed out on a single document (Fig. 3 not shown). The circuit (Fig. 2 not shown) permits display of the measured characteristics in turn on a meter.