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What is a “universal bridge�
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I recently came across this intriguing instrument from the 1970s(?):
It's a "Universal Bridge" made by Wayne Kerr.
It's not a type of device I've come across before and I'm curious what these are (were?) used for.
test-equipment bridge vintage
asked 2 days ago
NPE
3411416
 |Â
show 2 more comments
up vote
14
down vote
favorite
I recently came across this intriguing instrument from the 1970s(?):
It's a "Universal Bridge" made by Wayne Kerr.
It's not a type of device I've come across before and I'm curious what these are (were?) used for.
test-equipment bridge vintage
asked 2 days ago
NPE
3411416
1
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
@SpehroPefhany: Thank you for the link.
– NPE
yesterday
 |Â
show 2 more comments
up vote
14
down vote
favorite
up vote
14
down vote
favorite
I recently came across this intriguing instrument from the 1970s(?):
It's a "Universal Bridge" made by Wayne Kerr.
It's not a type of device I've come across before and I'm curious what these are (were?) used for.
test-equipment bridge vintage
asked 2 days ago
NPE
3411416
I recently came across this intriguing instrument from the 1970s(?):
It's a "Universal Bridge" made by Wayne Kerr.
It's not a type of device I've come across before and I'm curious what these are (were?) used for.
test-equipment bridge vintage
test-equipment bridge vintage
asked 2 days ago
NPE
3411416
asked 2 days ago
NPE
3411416
edited yesterday
asked 2 days ago
NPE
3411416
asked 2 days ago
NPE
3411416
asked 2 days ago
NPE
3411416
3411416
1
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
@SpehroPefhany: Thank you for the link.
– NPE
yesterday
 |Â
show 2 more comments
1
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
@SpehroPefhany: Thank you for the link.
– NPE
yesterday
1
1
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
@SpehroPefhany: Thank you for the link.
– NPE
yesterday
@SpehroPefhany: Thank you for the link.
– NPE
yesterday
 |Â
show 2 more comments
1 Answer
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up vote
15
down vote
accepted
User Janka actually has told the essentials in a short form. Computerized measuring equipment weren't generally available in 1970, they started to appear after the microprocessors were common. Precision RLC and voltage measurements have been needed at least 150 years.
The grandgrandfather of this is Wheatstone's resistance bridge. The idea in bridges isn't to measure directly, but by comparing to a reference and finding the ratio between the reference and the unknown value.
When the object to be measured is far from ideal, for ex. a lossy inductor, quite complex solutions are needed. You have one. It finds at the same time the inductance and the loss resistance (or conductance) at certain operating frequency (audio range only to keep the stray capacitance and inductance out of the results). Or actually you find it. You turn the knobs until the meter is at zero position. You have "balanced the bridge".
In the 1980's instrument's like this were computerized. The user only connected the part to be measured, listened a moment how the relays clicked instead of turning the manual switches and red the results from the display (R and L)
answered 2 days ago
user287001
7,9151415
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
15
down vote
accepted
User Janka actually has told the essentials in a short form. Computerized measuring equipment weren't generally available in 1970, they started to appear after the microprocessors were common. Precision RLC and voltage measurements have been needed at least 150 years.
The grandgrandfather of this is Wheatstone's resistance bridge. The idea in bridges isn't to measure directly, but by comparing to a reference and finding the ratio between the reference and the unknown value.
When the object to be measured is far from ideal, for ex. a lossy inductor, quite complex solutions are needed. You have one. It finds at the same time the inductance and the loss resistance (or conductance) at certain operating frequency (audio range only to keep the stray capacitance and inductance out of the results). Or actually you find it. You turn the knobs until the meter is at zero position. You have "balanced the bridge".
In the 1980's instrument's like this were computerized. The user only connected the part to be measured, listened a moment how the relays clicked instead of turning the manual switches and red the results from the display (R and L)
answered 2 days ago
user287001
7,9151415
add a comment |Â
up vote
15
down vote
accepted
User Janka actually has told the essentials in a short form. Computerized measuring equipment weren't generally available in 1970, they started to appear after the microprocessors were common. Precision RLC and voltage measurements have been needed at least 150 years.
The grandgrandfather of this is Wheatstone's resistance bridge. The idea in bridges isn't to measure directly, but by comparing to a reference and finding the ratio between the reference and the unknown value.
When the object to be measured is far from ideal, for ex. a lossy inductor, quite complex solutions are needed. You have one. It finds at the same time the inductance and the loss resistance (or conductance) at certain operating frequency (audio range only to keep the stray capacitance and inductance out of the results). Or actually you find it. You turn the knobs until the meter is at zero position. You have "balanced the bridge".
In the 1980's instrument's like this were computerized. The user only connected the part to be measured, listened a moment how the relays clicked instead of turning the manual switches and red the results from the display (R and L)
answered 2 days ago
user287001
7,9151415
add a comment |Â
up vote
15
down vote
accepted
up vote
15
down vote
accepted
User Janka actually has told the essentials in a short form. Computerized measuring equipment weren't generally available in 1970, they started to appear after the microprocessors were common. Precision RLC and voltage measurements have been needed at least 150 years.
The grandgrandfather of this is Wheatstone's resistance bridge. The idea in bridges isn't to measure directly, but by comparing to a reference and finding the ratio between the reference and the unknown value.
When the object to be measured is far from ideal, for ex. a lossy inductor, quite complex solutions are needed. You have one. It finds at the same time the inductance and the loss resistance (or conductance) at certain operating frequency (audio range only to keep the stray capacitance and inductance out of the results). Or actually you find it. You turn the knobs until the meter is at zero position. You have "balanced the bridge".
In the 1980's instrument's like this were computerized. The user only connected the part to be measured, listened a moment how the relays clicked instead of turning the manual switches and red the results from the display (R and L)
answered 2 days ago
user287001
7,9151415
User Janka actually has told the essentials in a short form. Computerized measuring equipment weren't generally available in 1970, they started to appear after the microprocessors were common. Precision RLC and voltage measurements have been needed at least 150 years.
The grandgrandfather of this is Wheatstone's resistance bridge. The idea in bridges isn't to measure directly, but by comparing to a reference and finding the ratio between the reference and the unknown value.
When the object to be measured is far from ideal, for ex. a lossy inductor, quite complex solutions are needed. You have one. It finds at the same time the inductance and the loss resistance (or conductance) at certain operating frequency (audio range only to keep the stray capacitance and inductance out of the results). Or actually you find it. You turn the knobs until the meter is at zero position. You have "balanced the bridge".
In the 1980's instrument's like this were computerized. The user only connected the part to be measured, listened a moment how the relays clicked instead of turning the manual switches and red the results from the display (R and L)
answered 2 days ago
user287001
7,9151415
edited 2 days ago
answered 2 days ago
user287001
7,9151415
answered 2 days ago
user287001
7,9151415
answered 2 days ago
user287001
7,9151415
7,9151415
add a comment |Â
add a comment |Â
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1
That's an R-L-C measuring bridge with integrated tube amplifier.
– Janka
2 days ago
@Janka: Not heard of a measuring bridge either I'm afraid. I guess more googling is in order. :)
– NPE
2 days ago
vintage-radio.net/forum/…
– Janka
2 days ago
Manual for the older B221 (which had magic eye tubes!)
– Spehro Pefhany
2 days ago
@SpehroPefhany: Thank you for the link.
– NPE
yesterday