Warren Parsons Log Book - Revision history

Foretony: /* TOTEM's power supply */

2011-09-02T19:53:11Z

TOTEM's power supply

Foretony: /* Summary of Changes to make */

2011-09-02T16:04:58Z

Summary of Changes to make

Foretony: /* Summary of Changes to make */

2011-09-02T16:03:29Z

Summary of Changes to make

Foretony: /* Summary of Changes to make */

2011-09-02T15:58:49Z

Summary of Changes to make

Foretony: /* Summary of Changes to make */

2011-09-02T15:52:14Z

Summary of Changes to make

Foretony: /* Summary of Changes to make */

2011-09-02T15:50:10Z

Summary of Changes to make

Foretony: /* I2C Voltage measurements */

2011-09-02T15:47:25Z

I2C Voltage measurements

Foretony: /* I2C Voltage measurements */

2011-09-02T15:34:42Z

I2C Voltage measurements

Foretony: /* I2C Voltage measurements */

2011-09-02T15:31:58Z

I2C Voltage measurements

Foretony: /* I2C Voltage measurements */

2011-09-02T15:28:52Z

I2C Voltage measurements

← Older revision		Revision as of 19:53, 2 September 2011
Line 3,998:		Line 3,998:

	http://www.ttid.co.uk/products-tti/psu/tsxp-series.htm		http://www.ttid.co.uk/products-tti/psu/tsxp-series.htm
		+
		+	I think we can use the Quad version of the power supply below since we only need 2.5 Volts and 1.2 A
		+
		+	http://www.tti-test.com/go/npl/plp-index.htm

	== Summary of Changes to make==		== Summary of Changes to make==

@@ Line 4,003: / Line 4,003: @@
 #install current limiting resistors so the I2C signal does not exceed 2.5 Volts
 #Change power supply BNC connector to be a [http://www.amphenolrf.com/search.asp?sid=4E601C80B2FE17F&N=51 triaxial] one so the ground is isolated from OUT+ and OUT- (S+,S-)
-#get a non switching linear power supply with both current and voltage limit settings.  Perhaps use a 2.5 volt voltage regulator on its output.
+#get a non switching linear power supply with both current and voltage limit settings.  Perhaps use a 2.5 volt voltage regulator on its output.  Also set power supply current to be limited to 0.2*6 =1.2 Amps
 #test the power supply response to VFAT on/offs.  A VFAT consumes 0.2 * 2.5 Amp*Volts (Watts) of power at most.  When in sleep mode it draws 0.07 A.  Measure the voltage output when the VFATs turn on and off to quantify how the power supply modulates the voltage.

@@ Line 4,002: / Line 4,002: @@
 #install current limiting resistors so the I2C signal does not exceed 2.5 Volts
-#Change power supply BNC connector to be
+#Change power supply BNC connector to be a [http://www.amphenolrf.com/search.asp?sid=4E601C80B2FE17F&N=51 triaxial] one so the ground is isolated from OUT+ and OUT- (S+,S-)
 #get a non switching linear power supply with both current and voltage limit settings.  Perhaps use a 2.5 volt voltage regulator on its output.
 #test the power supply response to VFAT on/offs.  A VFAT consumes 0.2 * 2.5 Amp*Volts (Watts) of power at most.  When in sleep mode it draws 0.07 A.  Measure the voltage output when the VFATs turn on and off to quantify how the power supply modulates the voltage.

← Older revision		Revision as of 15:58, 2 September 2011
Line 4,008:		Line 4,008:

	;A broken VFAT has been observed to draw 0.28 Amps compared to the 0.2 amps for a working one turned on and generating a default test pattern.		;A broken VFAT has been observed to draw 0.28 Amps compared to the 0.2 amps for a working one turned on and generating a default test pattern.
		+
		+	:ESD protection BNC connector
		+	;http://www.te.com/catalog/bin/TE.Connect?C=10004&M=PPROP&P=55859,75535&BML=11177,24174,24176,24187,24205,17636,17656&LG=1&PG=1&IDS=465859&N=1

← Older revision		Revision as of 15:52, 2 September 2011
Line 4,005:		Line 4,005:
	#get a non switching linear power supply with both current and voltage limit settings. Perhaps use a 2.5 volt voltage regulator on its output.		#get a non switching linear power supply with both current and voltage limit settings. Perhaps use a 2.5 volt voltage regulator on its output.
	#test the power supply response to VFAT on/offs. A VFAT consumes 0.2 * 2.5 Amp*Volts (Watts) of power at most. When in sleep mode it draws 0.07 A. Measure the voltage output when the VFATs turn on and off to quantify how the power supply modulates the voltage.		#test the power supply response to VFAT on/offs. A VFAT consumes 0.2 * 2.5 Amp*Volts (Watts) of power at most. When in sleep mode it draws 0.07 A. Measure the voltage output when the VFATs turn on and off to quantify how the power supply modulates the voltage.
		+
		+
		+	;A broken VFAT has been observed to draw 0.28 Amps compared to the 0.2 amps for a working one turned on and generating a default test pattern.

@@ Line 3,980: / Line 3,980: @@
 {|border="1"  |cellpadding="20" cellspacing="0
 |-
-|Trigger Rate||Number of Triggers|| Number of Accept pulses || Deadtime
+|Trigger Rate||Number of Triggers|| Number of Accept pulses
 |-
 | [[File:09022011_CI2CVoltageSwing.png| 200 px]]|| [[File:09022011_DI2CVoltageSwing.png| 200 px]]||  [[File:09022011_EI2CVoltageSwing.png| 200 px]]
 |-
-|DATAVALID and DATAOUT when using the linear power supply ungrounded||  Ground the linear power supply.  The noise is about 50 mV on the LVDS line ||   Now using the Acopian power supply
+|DATAVALID and DATAOUT when using the linear power supply ungrounded||  Ground the linear power supply.  The noise is about 50 mV on the LVDS line ||   Now using the Acopian power supply. Noise level is about 100 mV
 |}

← Older revision		Revision as of 15:34, 2 September 2011
Line 3,976:		Line 3,976:

	In this series of images you can see how the noise grows depending on the power supply used and the ground. The linear power supply needed to be grounded to the scope.		In this series of images you can see how the noise grows depending on the power supply used and the ground. The linear power supply needed to be grounded to the scope.
		+
		+
		+	{\|border="1" \|cellpadding="20" cellspacing="0
		+	\|-
		+	\|Trigger Rate\|\|Number of Triggers\|\| Number of Accept pulses \|\| Deadtime
		+	\|-
		+	\| [[File:09022011_CI2CVoltageSwing.png\| 200 px]]\|\| [[File:09022011_DI2CVoltageSwing.png\| 200 px]]\|\| [[File:09022011_EI2CVoltageSwing.png\| 200 px]]
		+	\|-
		+	\|DATAVALID and DATAOUT when using the linear power supply ungrounded\|\| Ground the linear power supply. The noise is about 50 mV on the LVDS line \|\| Now using the Acopian power supply
		+	\|}
		+
		+

	The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply. Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F). Notice the I2C pulse still swings negative about 1 Volt. Channel 2 is the DATAOUT pulse from the VFAT in port 112. Channel 3 is the DATAVALID pulse from the VFAT in port 112. The VFAT in port 112 is set to output the default test pattern. Notice there is about 100 mV of noise on the LVDS signals. This noise drops to 50 mV when I used the non-switching power supply by elind model 3232.		The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply. Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F). Notice the I2C pulse still swings negative about 1 Volt. Channel 2 is the DATAOUT pulse from the VFAT in port 112. Channel 3 is the DATAVALID pulse from the VFAT in port 112. The VFAT in port 112 is set to output the default test pattern. Notice there is about 100 mV of noise on the LVDS signals. This noise drops to 50 mV when I used the non-switching power supply by elind model 3232.

← Older revision		Revision as of 15:31, 2 September 2011
Line 3,973:		Line 3,973:

	The images above are observed with and without a VFAT (good or bad) card installed.		The images above are observed with and without a VFAT (good or bad) card installed.
		+
		+
		+	In this series of images you can see how the noise grows depending on the power supply used and the ground. The linear power supply needed to be grounded to the scope.

	The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply. Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F). Notice the I2C pulse still swings negative about 1 Volt. Channel 2 is the DATAOUT pulse from the VFAT in port 112. Channel 3 is the DATAVALID pulse from the VFAT in port 112. The VFAT in port 112 is set to output the default test pattern. Notice there is about 100 mV of noise on the LVDS signals. This noise drops to 50 mV when I used the non-switching power supply by elind model 3232.		The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply. Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F). Notice the I2C pulse still swings negative about 1 Volt. Channel 2 is the DATAOUT pulse from the VFAT in port 112. Channel 3 is the DATAVALID pulse from the VFAT in port 112. The VFAT in port 112 is set to output the default test pattern. Notice there is about 100 mV of noise on the LVDS signals. This noise drops to 50 mV when I used the non-switching power supply by elind model 3232.

@@ Line 3,974: / Line 3,974: @@
 The images above are observed with and without a VFAT (good or bad) card  installed.
-The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply.  Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F).  Notice the I2C pulse still swings negative about 1 Volt.  Channel 2 is the DATAOUT pulse from the VFAT in port 112.  Channel 3 is the DATAVALID pulse from the VFAT in port 112.  The VFAT in port 112 is set to output the default test pattern.
+The image below was taken with 6 VFATs installed (4 not working and drawing 0.3 mA each) using my power supply.  Channel 1 is an I2C pulse communicating with a VFAT in port 112 (VFAT F).  Notice the I2C pulse still swings negative about 1 Volt.  Channel 2 is the DATAOUT pulse from the VFAT in port 112.  Channel 3 is the DATAVALID pulse from the VFAT in port 112.  The VFAT in port 112 is set to output the default test pattern.  Notice there is about 100 mV of noise on the LVDS signals.  This noise drops to 50 mV when I used the non-switching power supply by elind model 3232.
 [[File:09022011_I2CLVDSVoltageSwing.png| 200 px]]