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ENDEVCO MODEL 136 DC AMPLIFIER 

INSTRUCTION MANUAL 

 

IM136 

Page 21 

 

2.  Filter Change/Replacement 

 
 

Place  the  model  136  on  a  level,  firmly  supported  surface.    Remove  the  two  front  panel 
screws.    Leave  the  front  panel  connector  connected  to  the  main  board.    Carefully  slide  the 
black cover from the unit.  

 
 

Reference  Figure  8  for  the  location  of  the  three  filter  modules.    Carefully  pry  off  the  metal 
grounding shield and locate the existing filter module(s) and gently pry it off (as you would an 
IC in a socket) and store it for future use.   

 
 

Observing  the  correct  orientation  of  the  new  filter  module(s),  install  it  in  the  correct  channel 
location desired.  Reinstall the grounding shield. 

 
 

Ensure  the  front  panel  connector  is  firmly  connected  and  re-assemble  the  cover  and  front 
panel. 

 

 

CAUTION: 

Ensure that the two front panel mounting screws are not over tightened or cross 
threaded.    The  aluminum  rail  screws  mount  into  soft  metal  that  can  easily  be 
damaged.    Should  the  rail  become  damaged,  simply  locate  a  replacement 
screw of a 1/2 inch longer length and install into the damaged rail.  (The screws 
are 4-40, stainless steel, self-tapping.) 

Unit Front

Power Supply

Filter Modules

Channel 1

Channel 2

Channel 3

Figure 10

 

 
2.4.16  Sample Set Up 
 
 

The following information is intended for the first time or infrequent user of this amplifier.   

 
 

A.  Using figure 1 as a reference, perform the following initial setups: 

 
 

1.  Using the "Select Channel" button, select channel 1.  (The LED illuminated is the channel 

that is being monitored by the DPM.) 

 
 

2.  Using the "Select Function" button, select the appropriate voltage level for the sensor type 

used.    While  the  LED  is  flashing  for  the  Input  Select  function,  press  the  "Edit"  button 
directly  above  or  below  the  word  "Edit"  on  the  front  panel.    This  will  cause  the  DPM  to 
display  either  0,  5,  10  or  15  VDC.    Once  the  appropriate  voltage  is  selected,  press  the 
"Select  Function"  button  to  save  the  voltage  level  and  the  "Select  Function"  LED  will 
automatically advance to the next function.   

 
 

3.  Press the "Select Function" button to advance to "Sensitivity (mV/EU)".  While the LED is 

flashing,  enter  the  correct  sensitivity  value  of  the  sensor  being  used.    (This  is 

Summary of Contents for IM136

Page 1: ...IM136 Revision D 30 September 1999 MODEL 136 DC AMPLIFIER INSTRUCTION MANUAL San Juan Capistrano California U S A ...

Page 2: ...15 2 4 10 Shunt Calibration 15 2 4 11 Monitoring State 16 2 4 12 Special Modes 17 2 4 13 Fault Indication 20 2 4 14 RS 232 Operation 20 2 4 15 Filter Options and Installation 20 2 4 16 Sample Set Up 21 2 5 RACK MOUNTING KIT 23 SECTION 3 ROUTINE MAINTENANCE AND HANDLING 3 1 INTRODUCTION 24 3 2 FACTORY SERVICE 24 3 3 ORDERING INFORMATION AND ACCESSORIES 25 SECTION 4 APPENDIX 1 Model 31875 XXXX O Fil...

Page 3: ...settings ENDEVCO has pioneered the concept of computer controlled signal conditioners The first generation was the Multi channel Amplifier Control system MAC The second generation was the Computer Controlled Amplifier Systems CCAS The CCAS family consists of five different systems that use the same rack and digital interface assemblies with different analog boards These units receive their setup c...

Page 4: ...6 can be manually programmed from the front panel Figure 1 by means of a Select Channel push button three 3 Channel LEDs a Select Function push button seven 7 Function LEDs indicating which function has been selected by the Select Function push button referred to in this document as the function LEDs a four 4 character LED display to show the state of each function four 4 EDIT push buttons to chan...

Page 5: ...andard and ordered optional accessories are included 2 1 2 FILTER MODULE INSTALLATION OR REPLACEMENT For filter module installation or replacement see Section 2 4 15 of this manual 2 1 3 POWERING ON THE UNIT For AC input power install the EW599 power cord into the rear power connection of the Model 136 See Figure 2 Rear Panel AC input power For optional DC input power Model 136 1 install the 9 to ...

Page 6: ...he channel that is actively being set up or data displayed on the DPM Figure 1 Item 4 is the digital panel meter DPM The DPM displays alpha numerics for the appropriate Select Channel selected and is used to display the channel set up and for actual data display The DPM has an accuracy of 10 See Section 2 4 Operation and sub sections contained for specific push button abilities FUNCTION OFF LED ON...

Page 7: ...cted to this connector Note The acceptable input power is 90 to 264 VAC 50 60 Hz No jumpers or adjustment is required for input voltages within this range The unit doe not have an on off power switch Figure 2 Item 2 is a standard BNC connector used for the output from each channel Figure 2 Item 3 is a blocked off area for a single channel depicted is channel 3 The channels correspond to the front ...

Page 8: ...lug style Model 136 1 DC Differential Voltage Amplifier CHANNEL 3 Input and Excitation RS 232 CHANNEL 2 OUTPUT CHANNEL 1 9 18 VDC 1 OUTPUT OUTPUT Input and Excitation Input and Excitation Figure 3 Instrumentation Amplifier 1 10 100 9 pin D Connector Programmable Gain 0 to 10 Offset Adjustment BNC Excitation Voltage 0 5 10 15 VDC PSEN RSH S S PSEN P 4 pole Butterworth Low Pass Filter 15 VDC 1 7 3 8...

Page 9: ...36 Page 8 Tx Rx EJ807 Adapter RJ11 RJ11 RJ11 Tx Rx 133 or 136 3 Channel Amplifier 2 4 5 2 4 5 Tx Rx 133 or 136 3 Channel Amplifier 2 4 5 Gnd 2 3 5 DB9F To PC Controller Figure 5 Figure 5 is the block diagram for the RJ 11 RS 232 computer control connector ...

Page 10: ... Analog Ground Pin 2 TX connects to RX in computer Pin 3 Not Used Pin 4 RX connects to TX in computer Pin 5 Digital Ground Pin 6 Digital Ground Pin 1 Pin 6 Figure 7 9 Pin D Input Connector Pin Assignment P N Description Pin 1 Psen Excitation Sense Pin 2 15 VDC Pin 3 Shunt Cal RSH Pin 4 S Sensor Input Pin 5 S Sensor Input Pin 6 Psen Excitation Sense Pin 7 P Excitation Voltage Pin 8 P Excitation Vol...

Page 11: ...wn in figure 5 or figure 6 This temporary high voltage may damage the sensor connected to the input of the unit The Model 136 is designed to restore the last excitation voltage programmed into it at power up Sensors could be damaged if the unit was previously set to an excitation voltage i e 15 V that is higher than the maximum excitation voltage rating for the sensor If the user is not sure what ...

Page 12: ...IFIER INSTRUCTION MANUAL IM136 Page 11 P P S S 7 5 8 4 P P S S 7 5 8 4 1 6 PSEN PSEN 1 6 PSEN PSEN Figure 9 Typical Bridge Connection With Remote Excitation Sensing Figure 8 Typical Bridge Connection Model 136 9 Pin D Connector ...

Page 13: ...programmed by pressing the Select Channel push button Each press of the Select Channel push button will sequentially turn on one of the 3 Channel LED s located to the right of the Select Channel push button indicating the channel number selected for programming The unit will remain in the selected mode state of operation normal or query programming while pressing the Select Channel push button 2 4...

Page 14: ...Query Programming Mode The selected Function LED will be blinking and the current setting will be displayed on the LED display Each additional press of the Select Function push button selects the next function corresponding Function LED blinking and the corresponding setting is displayed on the LED display Pressing the Select Function push button while the Monitoring State function LED is flashing...

Page 15: ...vides for programming the sensitivity of the transducer in mV EU The Endevco Model 136 uses this information to determine the gain needed to achieve the required output scaling The left right EDIT keys select the number position in the LED display and the up down EDIT keys increment or decrement the selected number The user can enter four 4 significant digits ranging from 0 001 to 9999 2 4 7 Outpu...

Page 16: ...tage to zero the setting will revert back to OFF This setting will change to OFF if Auto Zero is set to On and the user makes a change in any of the following functions Excitation Voltage Sensor Sensitivity Output Scaling and Low Pass Filter 3 Auto The unit sets the DC output voltage to zero to within 10 mVDC zero will depend on the DC voltage imbalance present at the input of the amplifier If the...

Page 17: ...m 0 000 to 9999 The value shown on the LED display is computed as follows Display EU VRMS at Output Output Scaling 2 Vout RMS voltage at Vout is monitored and shown on the LED display in VRMS at the rate of approximately two 2 times per second The values displayed on the LED display range from 0 00 to 9 99 The value shown on the LED display is computed as follows Display VRMS VRMS at Output 3 OFF ...

Page 18: ...n 10 0 2 MEM Address stored in non volatile memory 3 READ VID 4 IF VID 0 THEN Address MEM 5 IF VID 0 THEN Address VID MEM This special mode is selected by pressing the Select Function key while simultaneously pressing the RIGHT EDIT key The unit returns to the normal mode of operation Monitoring or Non monitoring state after pressing the Select Function key one more time When this special mode is ...

Page 19: ...ay every time any one of the front panel buttons is pressed This special mode is selected by pressing the Select Function key while simultaneously pressing the UP and LEFT EDIT keys The unit returns to the normal mode of operation Monitoring or Non monitoring state after pressing the Select Function key one more time 6 Recall Default Setup This special mode selection allows the user to recall the ...

Page 20: ... Calibration Constant Gain 1 Excitation Voltage k1 for 100 Gain 1000 200 2 Sensor Sensitivity k2 for 10 Gain 100 20 3 Output Scaling k3 for 0 Gain 10 2 4 Low Pass Filter not defined 2 5 Auto Zero not defined 2 6 Shunt Calibration k5 to calib slope of A D 1 7 Monitoring State k6 to calib offset of A D 1 8 Gain Calibration Calibration constants k1 through k4 are used to calibrate the gain of the uni...

Page 21: ...e optional Butterworth filters designed for use with the Endevco Model 133 PE and ISOTRON Signal Conditioner and Model 136 DC Amplifier The filters are low cost designs with sufficient corner frequencies to accommodate most test requirements The self identifying feature allows quick verification of the filter installed in a particular channel for the model 133 or model 136 Each channel will displa...

Page 22: ... simply locate a replacement screw of a 1 2 inch longer length and install into the damaged rail The screws are 4 40 stainless steel self tapping Unit Front Power Supply Filter Modules Channel 1 Channel 2 Channel 3 Figure 10 2 4 16 Sample Set Up The following information is intended for the first time or infrequent user of this amplifier A Using figure 1 as a reference perform the following initia...

Page 23: ... s 5 Press the Select Function button to advance to LP Filter kHz The options are OFF or 10 00 for the standard default 10 kHz filter module 6 Press the Select Function button to advance to Auto Zero The options are ON OFF or AUTO Each mode is defined as follows OFF all offset adjustments are set to neutral ON This sets the DC output voltage to zero within 10 mVDC AUTO This mode executes an automa...

Page 24: ...ne or more model 133 136 units first remove the two front panel screws from the Model 136 Gently remove the plastic frame from the Model 136 front panel store the panel for future use and for return of the unit to Endevco when required Hold the Model 136 behind the front panel mount the part with three cut out rectangular holes gently insert the Model 136 s front panel through the correct position...

Page 25: ...o Viejo Road San Juan Capistrano CA 92675 949 493 8181 To return an instrument please 1 Ensure proper packaging preferably the original shipping cartons 2 Prepay shipping and insurance charges 3 Attach the Return Material Authorization RMA number from Endevco and include any information that may be pertinent to the description of the failure problem B WARRANTY Endevco warrants each new electronic ...

Page 26: ... is supplied Description Endevco Part No Quantity Supplied Instruction Manual IM136 1 EC320 AC Power Cord EW599 1 Resistor Header for 4 pole Low Pass Filter 31875 XXXX O 0 Serial DB9F to RJ 11 Adapter EJ807 0 7 ft 6P4C Cable with RJ 11 Modular Plugs Straight Pinning EW1027 0 12 VDC Power Supply 26 Watts EHM1413 0 Auto Lighter to 760 Plug Cord Assembly 136 1 only EHM1409 1 9 pin D Mating Connector ...

Page 27: ...corner frequencies are as follows fo Hz Part number to order 10 31875 0001 0 20 31875 0002 0 40 31875 0004 0 60 31875 0006 0 80 31875 0008 0 100 31875 0010 0 200 31875 0020 0 300 31875 0030 0 600 31875 0060 0 800 31875 0080 0 1000 31875 0100 0 1650 31875 0165 0 4000 31875 0400 0 6000 31875 0600 0 8000 31875 0800 0 10 000 31875 1000 0 20 000 31875 2000 0 40 000 31875 4000 0 60 000 31875 6000 0 80 0...

Page 28: ...mands 0 2 3 4 5 7 allow 0 to indicate the command and it s associated data if any applies to all channels Command Required is one of the following 0x00 Channel x Setup data checksum follows 13x Receives 0x01 Channel x Cal Constant Data checksum follows 13x Receives 0x02 Channel x Send Setup Status data 13x Sends 0x03 Channel x Send Calibration Constant Data 13x Sends 0x04 Channel x Send data 13x S...

Page 29: ...d Data commands is sent to a 13x unit A value of 0 indicates a single sample of data is requested The 13x firmware will terminate the Send Data condition after 1 sample of data per enabled channel is sent To accomplish single transmissions easily set the Data Interval to 0 first then send Send Data commands at will One data sample per Send Data command will be returned with this scenario The firmw...

Page 30: ...t data transmission will be skipped Raw Vout Data The format of the data sent in response to the Raw Vout Data command 0x05 is identical to the Calibrated Vout Data discussed above Unit ID Data The data sent in response to the Unit ID from 13x command 0x09 is a string which states the Model number and the firmware revision i e 133 REV A LP Corners Data This data sent in response to the LP Corners ...

Page 31: ...6 s1 s9 132 Where 1 ASCII 276 50 55 54 is the result of the binary operation 1 8 20 Where 1 Model 136 and 20 is the unit number this binary number is then converted to an ASCII string 2 s is a space ASCII 32decimal 3 ASCII 1 49 is the binary channel 1 converted to ASCII 4 s is a space ASCII 32decimal 5 ASCII 9 57 is the binary command 9 Receive Unit ID converted to ASCII 6 ASCII 59decimal is a hea...

Page 32: ...imal 3 ASCII 0 48 is the binary channel 0 all channels converted to ASCII 4 s is a space ASCII 32decimal 5 ASCII 0 48 is the binary command 0 Send Setup converted to ASCII 6 ASCII 59decimal is a header separator 7 ASCII 3000 51 48 48 48 is the Voltage Excitation option 3 5 0 multiplied by 1000 This multiplication is done to normalize all of the data Some values are floating point others are intege...

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