Autolab Service Document # 009 – I-interrupt
Contents
1. Commands Procedures Commands Parameters Links Perens i Interrupt HAutolab P p eass l Remarks i Interrupt not possible with pAutolab types and PGSTAT10 a te Cyclic voltammetry potentiostatic Cyclic voltammetry galvanostatic SUC a Ei yg Signal sampler Time WE 1 Current i k Cyclic voltammetry current integration a Options No Options g i Linear sweep voltammetry potentiostatic E AUT40008 be Linear sweep voltammetry galvanostatic EPT tf aa Instrument description Linear polarization iaaa P Bee E Timed procedure i Hydrodynamic linear sweep i iol Autolab control E i Chrono amperometry At gt 1 ms i Set potential 0 900 i Chrono potentiometry At gt 1 ms fo Set cell On e Chrono amperometry fast js one if Wait time s 1 Pe Chrono potentiometry fast T d i Interrupt measurement e Chrono coulometry fast ps io l Set cell Off i Chrono charge discharge gn fi pe lt gt Positive psedback H Standards Interrupt not possible with pAutolab types and PGSTAT10 H My procedures Figure 7 NOVA i Interrupt procedure 2 Load the I Interrupt procedure and press the Start button The result should be similar to Figure 8 WEL Potential W _ D _ _ _ _ _ _ Ss amp amp amp wm J 0 0005 0 001 0 0015 Time fram interrupt 5 Figure 8 NOVA i Interrupt result on dummy cell C2. Metrohm Metrohm Autolab Service Document 009 Wrong transistor on control amplifier PCB sometimes triggers a failure in the l interrupt For PGSTAT128N and PGSTAT302N 8 Series Symptoms the symptoms for this problem are a possible failure of the current interrupt measurements The measured voltage is O V see Figure 1 0 0005 0 0005 sU WEL Potential W U 0015 O 002 J 0 0005 0 001 0 0015 Time from interrupt 5 Figure 1 Measured data on a 8 Series PGSTAT affected by the current interrupt problem This problem only affects the Series 8 instruments with Serial numbers up to AUT85345 The PGSTAT100N and the 7 Series instruments are not affected by this issue Autolab Service Document 009 I interrupt failure on PGSTAT302N amp PGSTAT128N Description the instruments in this group are fitted with a wrong transistor for controlling the i interrupt enable relay The problem can be addressed by removing this transistor and replace it with a new type of transistor The procedure is described in this document Recommended service action Metrohm Autolab advises to systematically check all instruments received for service for this issue Component identification and location T7 on Control Amplifier PCB of PGSTAT128N see Figure 3 T21 on Control Amplifier PCB of PGSTAT302N see Figure 5 The following components are involved in the problem described in this document PGSTAT128N Wrong tr
3. Autolab Service Document 009 I interrupt failure on PGSTAT302N amp PGSTAT128N
4. pins of the BC337 to length insert and solder the three pins from the top Autolab Service Document 009 I interrupt failure on PGSTAT302N amp PGSTAT128N For the PGSTAT302N The position of the transistor on the Control Amplifier PCB is shown in Figure 5 A ts ti Ry PEDR T t PAPIS A iP es a Fo 2 43 VOT NAAS Hi x 4 crt N Han A A x Ne Feud itn a gt Figure 5 T21 is located at the bottom of the Control Amplifier PCB If the wrong transistor is located on the PCB simply remove the resistor by cutting the three terminal pins as high as possible see Figure 6 Alternatively if the clearance is not enough break the housing of the transistor and remove the pins After cutting away the housing remove the remaining pins and remove the soldering material from the holes NET es ONT y OZW Grew SOV eA 2 3J AG Figure 6 Cut out the transistor from the PCB if the type is a BC547B Cut the pins of the BC337 to length insert and solder the three pins from the top Autolab Service Document 009 I interrupt failure on PGSTAT302N amp PGSTAT128N Final verification allow the instrument to warm up and run the TestCV procedure on the Autolab dummy cell Then connect dummy cell C and test the i interrupt circuit as explained below 1 Start up NOVA select Setup View and select the Procedures tab see Figure 7 File View Profile Run Tools Help BENENE J ee ee PC ee ee in
5. ansistor T7 BC547B proper transistor T7 BC337 40 PGSTAT302N Wrong transistor T21 BC547B proper transistor T21 BC337 40 If a BC547B see Figure 2 transistor is mounted on the Control Amplifier PCB remove it from the PCB and replace it with a new transistor of type BC337 40 see Figure 2 This transistor can be accessed without removing the control amplifier PCB To reach the transistor the Control amplifier PCB must be removed first see Autolab Service Manual Figure 2 The wrong transistor BC547B top and the correct transistor BC337 40 bottom are easy to identify by their printed code the shape coding and manufacturer can be slightly different then showed in this figure Autolab Service Document 009 I interrupt failure on PGSTAT302N amp PGSTAT128N For the PGSTAT128N The position of the transistor on the Control Amplifier PCB is shown in Figure 3 LoF TOR od OP Figure 3 T7 is located at the bottom of the Control Amplifier PCB If the wrong transistor is located on the PCB simply remove the resistor by cutting the three terminal pins as high as possible see Figure 4 Alternatively if the clearance is not enough break the housing of the transistor and remove the pins After cutting away the housing remove the remaining pins and remove the soldering material from the holes A T a E Figure 4 Cut out the transistor from the PCB if the type is a BC547B Cut the
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